STMicroelectronics 32L4R9IDISCOVERY User Manual

Introduction

UM2271

User manual

Discovery kit with STM32L4R9AI MCU

The 32L4R9IDISCOVERY kit is a complete demonstration and development platform for the
STMicroelectronics Arm
Leveraging the innovative ultra-low power oriented features, 640
graphics performance (Chrom-ART Accelerator™) and DSI controller offered by the
STM32L4R9AI, the 32L4R9IDISCOVERY kit enables users to easily prototype applications
with state-of-the-art energy efficiency, as well as providing stunning audio and graphics
rendering with direct support for an AMOLED DSI round display. For even more user­friendliness, the on-board ST-LINK/V2-1 debugger provides out-of-the-box programming
and debugging capabilities.

The STM32L4R9AI microcontroller features four I2Cs, five USARTs, one ULP UART, three
SPIs, two SAIs, one SDIO, one USB 2.0 full-speed OTG, two CANs, one FMC parallel
synchronous interface, one 12-bit ADC, one 12-bit DAC, two ULP analog comparators, two
op amps, one 2 data-lane DSI display, one digital filter for sigma delta modulator and SWP
interface, two Octo-SPI interfaces, 8- to 14-bit camera interface, one touch sensing
controller interface, JTAG and SWD debugging support.

This Discovery board offers everything required for users to get started quickly and develop
applications easily.The hardware features on the board help to evaluate the following
peripherals: USB OTG FS, microSD™ card, 8-bit camera interface, 16-Mbit PSRAM, PMOD
and STMod+ connectors, IDD measurement, full-duplex I2S with an audio codec and stereo
headset jack including an analog microphone, DFSDM with a pair of MEMS digital
microphones on board, 512-Mbit Octo-SPI Flash memory device, I2C extension connector,

1.2" AMOLED display using a one data-lane DSI interface with a capacitive touch panel.
The Arduino™ compatible connectors expand the functionality with a wide choice of
specialized shields. The integrated ST-LINK/V2-1 provides an embedded in-circuit
debugger and programmer for the STM32 MCU.

Figure 1. 32L4R9IDISCOVERY top view Figure 2. 32L4R9IDISCOVERY bottom view

®

Cortex®-M4 core-based STM32L4R9AI microcontroller.

Kbytes of embedded RAM,

Pictures are not contractual

October 2017 DocID030906 Rev 2 1/78

www.st.com

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Contents UM2271

Contents

1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 Product marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4 Development toolchains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5 Demonstration software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

7 Technology partners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

8 Bootloader limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

9 AMOLED display limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

10 Hardware layout and configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

10.1 32L4R9IDISCOVERY layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

10.2 32L4R9IDISCOVERY mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . 15

10.3 Embedded ST_LINK/V2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

10.3.1 Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

10.3.2 ST-LINK/V2-1 firmware upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

10.4 Low-power consumption status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

10.5 TAG and SWD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

10.6 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

10.6.1 Power supply sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

10.6.2 MCU power supply options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

10.6.3 Supplying 32L4R9IDISCOVERY through ST-LINK/V2-1 USB . . . . . . . . 21

10.6.4 Measurement of MCU current consumption . . . . . . . . . . . . . . . . . . . . . 22

10.6.5 Program or debug when power supply not from ST-LINK/V2-1 . . . . . . . 23

10.7 Clock sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

10.8 Reset Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

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10.9 Boot configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

10.10 Audio codec . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

10.11 DFSDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

10.12 PSRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

10.13 USB OTG FS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

10.13.1 32L4R9IDISCOVERY as USB device . . . . . . . . . . . . . . . . . . . . . . . . . . 25

10.13.2 32L4R9IDISCOVERY as USB host . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

10.14 Octo-SPI Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

10.15 Virtual COM port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

10.16 Buttons and LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

11 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

11.1 Arduino connectors CN10, CN11, CN16 and CN17 . . . . . . . . . . . . . . . . . 28

11.2 DSI display, backlight and touch panel connector CN4 . . . . . . . . . . . . . . 30

11.2.1 DSI AMOLED display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

11.2.2 Backlight and OLED power supplies generation . . . . . . . . . . . . . . . . . . 32

11.2.3 Touch panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

11.3 USB OTG FS connector CN9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

11.4 ST-LINK/V2-1 USB Micro-B connector CN13 . . . . . . . . . . . . . . . . . . . . . 33

11.5 microSD card connector CN6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

11.6 STMod+ connector CN1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

11.7 PMOD connector CN3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

11.8 Camera module connector CN2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

11.9 TAG connector CN8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

11.10 SWD header CN5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

11.11 EXT_I2C connector CN7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

11.12 Stereo headset and headphone jack CN12 . . . . . . . . . . . . . . . . . . . . . . . 41

Appendix A GPIO assignment and sharing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Appendix B Solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Appendix C STMod+ GPIO sharing and multiplexing . . . . . . . . . . . . . . . . . . . . . 52

Appendix D Schematics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

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Appendix E Fanout board (MB1280) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

E.1 MikroElektronika mikroBUS™ compatible connector

(Fanout CN10 / CN11). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

E.2 ESP-01 Wi-Fi

®

board compatible connector. . . . . . . . . . . . . . . . . . . . . . . 72

E.3 Compatible connectors for the Grove boards . . . . . . . . . . . . . . . . . . . . . . 72

E.3.1 Compatible connector for I2C Grove boards (Fanout CN3) . . . . . . . . . . 72

E.3.2 Compatible connector for UART Grove boards (Fanout CN2) . . . . . . . . 73

Appendix F Federal Communications Commission (FCC) and Industry Canada

(IC) Compliance74

F.1 FCC Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

F.1.1 Part 15.19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

F.1.2 Part 15.105 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

F.1.3 Part 15.21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

F.2 IC Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

F.2.1 Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

F.2.2 Déclaration de conformité. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Appendix G CISPR32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

G.1 Warning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

4/78 DocID030906 Rev 2

UM2271 List of tables

List of tables

Table 1. Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Table 2. JP10: VDD_STL setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Table 3. SW1 switch setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Table 4. 32L4R9IDISCOVERY power sources configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Table 5. JP4: power source selector setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Table 6. JP5: ARD 5 V input/output voltage selection setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 7. JP7: VDD setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 8. JP1: IDD_MCU measurement setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 9. JP3: VDDA and VDDUSB, settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 10. Boot modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Table 11. LD1 and LD2 details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Table 12. Buttons and LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Table 13. Arduino compatible connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Table 14. JP3, VDDA and VDDUSB, settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Table 15. DSI display connector CN4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Table 16. USB OTG FS Micro-AB connector CN9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table 17. USB Micro-B connector CN13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Table 18. microSD connector CN6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 19. STMod+ connector CN1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 20. Quad SPDT switch configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 21. PMOD connector CN3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Table 22. Camera module connector CN2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Table 23. TAG connector CN8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Table 24. SWD header CN5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 25. EXT_I2C connector CN7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 26. I2C1 addresses (on board) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 27. Audio jack connector CN12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Table 28. 32L4R9IDISCOVERY GPIO assignment and sharing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Table 29. MFX_V3 GPIO assignment (LQFP48) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Table 30. 32L4R9IDISCOVERY solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Table 31. STMod+ GPIO sharing and multiplexing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Table 32. SPDT quad switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Table 33. Description of the mikroBUS connectors (CN11 and CN10) . . . . . . . . . . . . . . . . . . . . . . . 72

Table 34. Description of the ESP-01 Wi-Fi board connector pins. . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Table 35. Description of the I2C Grove board connector pins (CN3) . . . . . . . . . . . . . . . . . . . . . . . . . 73

Table 36. Description of the UART Grove board connector pins (CN2) . . . . . . . . . . . . . . . . . . . . . . . 73

Table 37. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

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List of figures UM2271

List of figures

Figure 1. 32L4R9IDISCOVERY top view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2. 32L4R9IDISCOVERY bottom view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 3. Hardware block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 4. 32L4R9IDISCOVERY top side layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 5. 32L4R9IDISCOVERY bottom side layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 6. 32L4R9IDISCOVERY mechanical drawing (top view, in mm) . . . . . . . . . . . . . . . . . . . . . . 15

Figure 7. 32L4R9IDISCOVERY mechanical drawing (bottom view, in mm) . . . . . . . . . . . . . . . . . . . 16

Figure 8. How to update driver software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 9. JP4 default configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 10. DSI display connector CN4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 11. USB OTG FS Micro-AB connector CN9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 12. USB Micro-B connector CN13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 13. microSD connector CN6 (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 14. STMod+ connector CN1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 15. PMOD connector CN3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 16. Camera module connector CN2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 17. TAG connector CN8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Figure 18. EXT_I2C connector CN7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Figure 19. Stereo headset with microphone jack CN12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Figure 20. 32L4R9IDISCOVERY board interconnections (MB1311C) . . . . . . . . . . . . . . . . . . . . . . . . 55

Figure 21. 32L4R9IDISCOVERY power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Figure 22. 32L4R9IDISCOVERY Arduino Uno V3 connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Figure 23. 32L4R9IDISCOVERY ST-LINK/V2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Figure 24. 32L4R9IDISCOVERY Octo-SPI Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Figure 25. 32L4R9IDISCOVERY peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Figure 26. 32L4R9IDISCOVERY USB OTG FS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Figure 27. 32L4R9IDISCOVERY Round DSI display interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Figure 28. 32L4R9IDISCOVERY IDD measurement and Multi Function eXpander . . . . . . . . . . . . . . 63

Figure 29. 32L4R9IDISCOVERY microcontroller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Figure 30. 32L4R9IDISCOVERY PSRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Figure 31. 32L4R9IDISCOVERY camera . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Figure 32. 32L4R9IDISCOVERY STMOD+ interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Figure 33. 32L4R9IDISCOVERY Audio and DFSDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Figure 34. Round DSI display board (MB1314) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Figure 35. Fanout board (MB1280) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Figure 36. STMod+ Fanout module plugged into CN1 connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

6/78 DocID030906 Rev 2

UM2271 Features

1 Features

• STM32L4R9AI Arm-based microcontroller with 2-Mbyte Flash memory and 640-Kbyte
RAM in UFBGA169 package

• 1.2" 390x390 pixel AMOLED round display panel with 16 million colors depth, MIPI
interface and capacitive touch panel

• USB OTG FS

• On-board current measurement

• SAI audio codec

• ST-MEMS digital microphones

• 16-Mbit asynchronous PSRAM

• 512-Mbit Octo-SPI Flash

• 2 user LEDs

• 1 reset push-button

• 4-direction joystick with selection button

• Board connectors:

– 8-bit camera
– USB OTG FS with Micro-AB
– Stereo headset jack including analog microphone input
– microSD card

• Board expansion connectors:
– Arduino Uno V3
–STMod+
–PMOD
– EXT_I2C

• Flexible power-supply options:
–ST-LINK USB V

• On-board ST-LINK/V2-1 debugger/programmer with USB
re-enumeration capability: mass storage, virtual COM port and debug port

• Comprehensive free software libraries and examples available with the STM32Cube
package

• Support of a wide choice of integrated development environments (IDEs), including
IAR™, Keil

®

and GCC-based IDEs

or external sources

BUS

®

DSI

2 Product marking

Evaluation tools marked as “ES” or “E” are not yet qualified and are therefore not ready to
be used as reference design or in production. Any consequences arising from such usage

DocID030906 Rev 2 7/78

77

System requirements UM2271

will not be at ST’s charge. In no event will ST be liable for any customer usage of these
engineering sample tools as reference designs or in production.

‘E’ or ‘ES’ marking examples of location:

• on the targeted STM32 that is soldered on the board (for illustration of STM32 marking,

refer to the section ‘Package information’ of the STM32 datasheet at www.st.com).

• next to the evaluation tool ordering part number, that is stuck or silkscreen printed on

the board

This board features a specific STM32 device version which allows the operation of any
stack or library. This STM32 device shows a "U" marking option at the end of the standard
part number and is not available for sales.

3 System requirements

• Windows® OS (7, 8 and 10), Linux® 64-bit or macOS

• USB Type-A to Micro-B cable

4 Development toolchains

• Keil MDK-ARM

• IAR EWARM

• GCC-based IDEs including free SW4STM32 from AC6

(a)

(a)

5 Demonstration software

The demonstration software, included in the STM32Cube package corresponding to the on­board MCU, is preloaded in the STM32 Flash memory for easy demonstration of the device
peripherals in standalone mode. The latest versions of the demonstration source code and
associated documentation can be downloaded from the www.st.com/stm32l4-discovery web
page.

®

6 Ordering information

To order the 32L4R9IDISCOVERY kit, refer to Table 1.

a. On Windows only

8/78 DocID030906 Rev 2

UM2271 Technology partners

Order code Target STM32

STM32L4R9I-DISCO STM32L4R9AII6

Table 1. Ordering information

7 Technology partners

MACRONIX:

512-Mbit Octo-SPI NOR Flash memory device, part number MX25LM51245GXDI00

GOVISIONOX OPTOELECTRONICS:

1.2 inch 390x390 AMOLED display, part number G1120TB103GF-001

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Bootloader limitations UM2271

8 Bootloader limitations

Boot from system Flash memory results in executing bootloader code stored in the system
Flash memory protected against writing and erasing. This allows in-system programming
(ISP), that is, flashing the STM32 user Flash memory. It also allows writing data into RAM.
The data come in via one of communication interfaces such as USART, SPI, I2C bus, USB
or CAN.

Bootloader version is identified by reading the bootloader ID at the address 0x1FFF6FFE.
Its value is 0x91 for bootloader V9.1 and 0x92 for V9.2.

The STM32L4R9AII6 part soldered on the 32L4R9IDISCOVERY main board is marked with
a date code corresponding to its date of manufacturing. STM32L4R9AII6 parts with a date
code prior or equal to week 37 of 2017 are fitted with bootloader V9.1 affected by the
limitations to be worked around, as described hereunder. Parts with the date code starting
from week 38 of 2017 contain bootloader V9.2 in which the limitations no longer exist.

To locate the visual date code information on the STM32L4R9II6 package, refer to its
datasheet (DS12023) available at www.st.com, section Package Information. Date code
related portion of the package marking takes Y WW format, where Y is the last digit of the
year and WW is the week. For example, a part manufactured in week 38 of 2017 bares the
date code 7 38.

There is also another mean to identify the need for workaround: before opening the blister of
the Discovery Kit, just check the back side of the blister. At the bottom left side, if the
reference number is equal or higher than 32L4R9IDISCO/ 02-0, it means the bootloader
version is V9.2 and there is no need to apply workaround. Any other inferior number like 01­0 will need the workaround.

Bootloader ID for the bootloader V9.1 is 0x91.

The following limitation exists in the bootloader V9.1:

Some user Flash memory data get corrupted when written via SPI interface

Description:

During bootloader SPI Write Flash operation, some random 64-bits (2 double-words) may
be left blank at 0xFF

Workarounds:

WA1: add a delay between sending Write command and its ACK request. Its duration
should be the duration of the 256-Byte Flash write time.

WA2: read back after each write operation (256 bytes or at end of user code flashing) and in
case of error start write again.

WA3: Using bootloader, load a patch code in RAM to write in Flash memory through same
Write Memory write protocol as bootloader (code provided by ST). The patch code is
available for download from www.st.com website with a readme.txt file containing usage
instructions.

10/78 DocID030906 Rev 2

UM2271 AMOLED display limitation

9 AMOLED display limitation

Warning: Permanent image sticking may occur if AMOLED displays

same image for an extended period of time.

10 Hardware layout and configuration

32L4R9IDISCOVERY board is designed around the STM32L4R9AI (169 ball UFBGA
package DSI version). The hardware block diagram
between STM32L4R9AI and peripherals (PSRAM, Octo-SPI Flash, DSI color display, USB
OTG connector, USART, audio, camera connector, STMod+ and PMOD connectors, IDD
measurement, joystick, microSD card, I
embedded ST-LINK).
board. Mechanical drawing for 32L4R9IDISCOVERY and round DSI display boards is
described in

Figure 6.

Figure 4 and Figure 5 help the user to locate these features on the

2

C extension connector, Arduino Uno shields and

Figure 3 illustrates the connection

DocID030906 Rev 2 11/78

77

Hardware layout and configuration UM2271

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12/78 DocID030906 Rev 2

UM2271 Hardware layout and configuration

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Figure 4. 32L4R9IDISCOVERY top side layout

DocID030906 Rev 2 13/78

77

Hardware layout and configuration UM2271

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14/78 DocID030906 Rev 2

UM2271 Hardware layout and configuration

10.2 32L4R9IDISCOVERY mechanical drawing

Figure 6. 32L4R9IDISCOVERY mechanical drawing (top view, in mm)

Legend:

= Indicates the mounting hole between the 32L4R9IDISCOVERY board (at the top of Figure 6) and

the round DSI display board (at the bottom of Figure 6)

DocID030906 Rev 2 15/78

77

Hardware layout and configuration UM2271

Figure 7. 32L4R9IDISCOVERY mechanical drawing (bottom view, in mm)

Plastic spacer height = 13 mm, overall height = 26 mm ± 1 mm

10.3 Embedded ST_LINK/V2-1

The ST-LINK/V2-1 programming and debugging tool is integrated on the
32L4R9IDISCOVERY board. Compared to ST-LINK/V2, the changes are listed below:

• new features supported on ST-LINK/V2-1:
– USB software re-enumeration
– Virtual Com port interface on USB
– Mass storage interface on USB
– USB power management request for more than 100 mA power on USB

• features no more supported on ST-LINK/V2-1:
–SWIM interface
– Application voltage lower than 3 V

For general information concerning the debugging and programming features that are
common to both versions V2 and V2-1, refer to ST-LINK/V2 in-circuit
debugger/programmer.

16/78 DocID030906 Rev 2

UM2271 Hardware layout and configuration

10.3.1 Drivers

Before connecting the 32L4R9IDISCOVERY to a Windows (7, 8, 10) PC via USB, a driver
for ST-LINK/V2-1 must be installed. It is available on the www.st.com website.

If 32L4R9IDISCOVERY is connected to the PC before the driver is installed, some
interfaces of the board may be declared as ‘Unknown’ in the PC device manager. In this
case the user must install the driver files, and update the driver of the connected device
from the device manager as shown on

Note: Prefer using the ‘USB Composite Device’ handle for a full recovery.

Figure 8. How to update driver software

Figure 8: How to update driver software

10.3.2 ST-LINK/V2-1 firmware upgrade

The ST-LINK/V2-1 embeds a firmware upgrade mechanism for in-situ upgrade through the
USB port. As the firmware may evolve during the life time of the ST-LINK/V2-1 product
(such as new functionality, bug fixes or support for new microcontroller families), it is
recommended to visit www.st.com before starting to use the 32L4R9IDISCOVERY and
periodically, in order to stay up-to-date with the latest firmware version.

10.4 Low-power consumption status

There is a way to make the board get into very low power consumption status in which the
current on +5

1. The connections between ST-LINK/V2-1 and MCU must be disconnected by micro
switch SW1 manually (see
ARD-5V IN position. Remove JP10. Then, connect an external 5 V power supply on
CN16 pin 5 5V and on GND.

2. Peripherals (including display, CTP and PSRAM) are powered off by MOSFET which is
controlled by MFX_GPIO8 / MFX_aGPIO2 (put them as input floating), and by setting

V can be below 20 uA. How to get into the low power mode:

Tabl e 3 below). Set JP4 on (7) ARD position, and put JP5 in

DocID030906 Rev 2 17/78

77

Hardware layout and configuration UM2271

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all peripherals related I/Os to inactive level (input pull-down or input is good option
according to I/Os).

3. Disconnect JP9 to remove +5 V from LD8 power LED, disconnect JP10 (or put it in 2-3
position), power off OCTOSPI (remove SB23/SB24) and configure related I/Os as input
pull down.

4. Peripherals can be setup by FW to reach power down mode. All I/Os must be
configured in non-consuming states. Set MFX_V3 to sleep mode, get SD card out of its
socket slot. Set the Audio Codec in power down.

10.5 TAG and SWD

One TAG interface footprint CN8 is reserved on 32L4R9IDISCOVERY and is usable to
debug and program the on-board MCU.

Note: Micro switch SW1 must be put in Off position. R24 and R31 must be disconnected.

The SWD 6-pin header CN5 added on 32L4R9IDISCOVERY, connected to on board ST­LINK MCU, is usable to debug and program an external MCU.

VDD from the external board is 1.8 V or 3.3 V, thanks to the on board voltage converter.

Table 2. JP10: VDD_STL setting

Jumper Setting Description

Default setting.
VDD_STL gets power from 32L4R9IDISCOVERY. ST-LINK is

JP10

then usable to program the on-board MCU.

VDD_STL gets power from external through CN5. ST-LINK is
then usable to program an external MCU.

SW1 is accessible on bottom side of 32L4R9IDISCOVERY. By default, SW1 is in On
position. To put micro switch in Off position, just push away the switch from ON position as
shown in

Tabl e 3.

Table 3. SW1 switch setting

Switch Setting Description

Default setting.
SW1 switch is On.

SW1

SW1 is Off.

18/78 DocID030906 Rev 2

UM2271 Hardware layout and configuration

06Y9

10.6 Power supply

10.6.1 Power supply sources

32L4R9IDISCOVERY is designed to be powered by +5 V DC power supply. It is possible to
configure the 32L4R9IDISCOVERY to use any of the sources listed in

By default, the JP4 header must have a jumper on (1) STLK and SW1 is placed in ON
position. Any JP4 position different from (1) STLK requires SW1 to be placed in OFF
position (see

Tabl e 3).

Table 4. 32L4R9IDISCOVERY power sources configuration

Tabl e 4.

JP4 configuration

(function)

(1) STLK (USB_STLINK) CN5 (VBUS) 5 V 500 mA

(3) E5V (ARDUINO) CN16 (VIN) 6 V - 9 V => 5 V

(5) U5V (USB_OTG_FS) CN8 (VBUS) 5 V 500 mA

(7) ARD (ARDUINO) CN16 (ARD-5V)

(9) CHGR (USB_STLINK) CN5 (VBUS) 5 V

1. ARD-5V is a power output pin to Arduino connector CN16 (default) or a power input pin from Arduino

connector CN16, according to JP5 setting. See Table 6 below.

Power source

connector (pin name)

(1)

Voltage Available current

Arduino Uno V3 shield

dependent

5 V

Arduino Uno V3 shield

dependent

Power supply

dependent

Note: 32L4R9IDISCOVERY must be powered by a power-supply unit or by an auxiliary equipment

complying with the standard EN-60950-1: 2006+A11/2009, and must be safety extra low
voltage (SELV) with limited power capability.

Figure 9 shows a physical description of the 10-pin header JP4 default configuration.

Figure 9. JP4 default configuration

Detailed description of all JP4 possible configurations are listed below and in Ta b le 5:

• STLK: 5 V from the ST-LINK/V2-1 USB connector CN13 with 500 mA current limitation.
Power mechanism of supplying the board by STLINK/V2-1 is explained Section 10.6.3.

DocID030906 Rev 2 19/78

77

Hardware layout and configuration UM2271

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A jumper must be placed in location STLK of JP4, connecting pins 1 and 2. The green
LED LD8 is lit on to confirm presence of 5 V voltage.

• E5V: 5 V from the 6 V to 9 V DC from VIN pin of Arduino compatible connector CN16
(the U15 regulator is converting VIN into a 5 V voltage). The VIN input voltage is limited
to 9 V to keep temperature of the regulator U15 within its thermal safe area. A jumper
must be placed connecting pins 3 and 4 of JP4. The green LED LD8 is lit on to confirm
presence of 5 V voltage. SW1 must be placed in OFF position.

• U5V: 5 V from the 5 V DC of USB OTG FS user connector CN9. A jumper must be
placed in location USB of JP4, connecting pins 5 and 6.The green LED LD8 is lit on to
confirm presence of 5 V voltage. SW1 must be placed in OFF position.

• ARD: 5 V from the 5 V of Arduino compatible connector CN16. A jumper must be
placed in location ARD of JP4, connecting pins 7 and 8. The green LED LD8 is lit on to
confirm presence of 5 V voltage and at t the same time, pins 2 and 3 of JP5 must be
connected to get 5 V power from Arduino. SW1 must be placed in OFF position. In
case the main board provides 5 V to Arduino compatible connector CN16, which is the
default configuration, pins 1 and 2 of JP5 must be connected (see Tabl e 6 ).

• CHGR: 5 V from 5 V DC power charger connected to USB STLINK (CN13). In this
case, if 32L4R9IDISCOVERY is powered by an external USB charger, then the debug
on CN13 is not available. When CHGR input is chosen, it is not recommended to
connect a PC on USB STLINK, because the 500 mA limitation is no more effective and
this may damage the PC. A jumper must be placed in location CHGR of JP4,
connecting pins 9 and 10. The green LED LD8 is lit on to confirm presence of 5 V
voltage. SW1 must be placed in OFF position.

Table 5. JP4: power source selector setting

Jumper Setting Description

Default setting.
32L4R9IDISCOVERY is supplied though CN13 Micro-B

ST-LINK/V2-1 connector.

32L4R9IDISCOVERY is supplied though Arduino connector
CN16 (VIN).

JP4

32L4R9IDISCOVERY is supplied though USB OTG FS
connector CN9.

32L4R9IDISCOVERY powers ARDUINO or is supplied by
ARDUINO, according to JP5 setting in Tab l e 6 below.

32L4R9IDISCOVERY is supplied though CN13 Micro-B ST­LINK/V2-1 connector. In that case, the SB36 solder bridge must
be soldered.

20/78 DocID030906 Rev 2

UM2271 Hardware layout and configuration

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Jumper Setting Description

Default setting.
32L4R9IDISCOVERY supplies 5 V to Arduino connector CN16.

JP5

32L4R9IDISCOVERY is supplied by 5 V from Arduino connector
CN16.

10.6.2 MCU power supply options

32L4R9IDISCOVERY offers possibility to supply the MCU under 1.8 V or 3.3 V. The JP7
jumper must be placed on +3V3 to supply the MCU with 3.3
jumper can be placed on +1V8 of JP7 to supply the MCU with 1.8
pins

2 and 3 (see Table 7).

Functions listed below are not compatible with the +1V8 setting of JP7:

• OCTOSPI

• PSRAM

• ARDUINO Uno Revision 3

• CAMERA

• microSD card

• ADC measurements (except if JP3 is set at +3V3, or except if VREF+ configuration is

changed)

• USB OTG FS (except if JP3 is set at +3V3)

Table 7. JP7: VDD setting

SW1 must be placed in OFF position.

V, connecting pins 1 and 2. The

V, connecting

Jumper Setting Description

Default setting.
VDD is powered from +3V3 regulator.

JP7

VDD is powered from +1V8 regulator.

10.6.3 Supplying 32L4R9IDISCOVERY through ST-LINK/V2-1 USB

To power the board through ST-LINK/V2-1, the USB host (a PC) must be connected with the
32L4R9IDISCOVERY standard Micro-B USB receptacle, via a USB cable. This event starts
the USB enumeration procedure. In its initial phase, the current supply capability of the USB
host port is limited to 100
32L4R9IDISCOVERY draws power at that time. If the solder bridge SB36 is open (default
setting), the U11 ST890 power switch is set to Off position, which isolates the remainder of
the board from the power source. In the next phase of the enumeration procedure, the host
PC informs the ST-LINK/V2-1 facility of its capability to supply up to 500
answer is positive, the ST-LINK/V2-1 sets the U11 ST890 switch to On position to supply
power to the remainder of the board. If the PC USB port is not capable of supplying up to
500

mA, another power source must be used like VIN pin of connector CN16.

mA. It is enough because only ST-LINK/V2-1 part of

mA current. If the

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Hardware layout and configuration UM2271

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625

mA, in case a short circuit occurs on the board (the red LED fault LD5 lights on).

32L4R9IDISCOVERY can also be supplied by STLINK USB power source with no
enumeration, such as a USB charger. In this particular case, the SB36 solder bridge must
be closed. ST-LINK/V2-1 turns the ST890 power switch On regardless of enumeration
procedure result and passes the power unconditionally to the board. The green LED LD8
lights on whenever the whole board is powered.

10.6.4 Measurement of MCU current consumption

Jumper JP1 allows the consumption of STM32L4R9AI to be measured directly by a built-in
MCU current ammeter circuit (MFX_V3, able to measure from 60
removing the jumper and replace it by an external ammeter (see

To measure the MCU consumption in standby or shutdown modes, MFX_V3 needs to run
software. To wake up MCU from these modes, it is necessary to press the Reset button B1,
or to wait a few seconds.

Jumper Setting Description

JP1

Table 8. JP1: IDD_MCU measurement setting

Default setting.
A module on the board is designed to measure from 60 nA to

50 mA by using several MOSFET, and switching automatically
depending on the read value.

STM32L4R9AI is powered by VDD. MCU current measurement
is not possible

No jumper on JP1: an ammeter can be connected on
pins 2 and 3 to measure STM32L4R9AI current (if there is no
ammeter, STM32L4R9AI is not powered).

nA to 50 mA) or by

Table 8).

VDDA and VDDUSB power inputs from STM32L4R9AI can be connected to two different
power sources, +3V3 or VDD_MCU. These power inputs may be included or not in the IDD
current measurement of VDD_MCU, depending on the JP3 jumper configurations described
in

Tabl e 9.

Jumper Setting Description

JP3

22/78 DocID030906 Rev 2

Table 9. JP3: VDDA and VDDUSB, settings

Default setting.
VDDA and VDDUSB power pins of STM32L4R9AI are supplied

with +3V3. the IDD measurement does not include their current
consumption. USB OTG FS is functional even if JP7 is set on
+1V8.

VDDA and VDDUSB power pins of STM32L4R9AI are supplied
with VDD_MCU. The IDD measurement includes their current
consumption.

UM2271 Hardware layout and configuration

10.6.5 Program or debug when power supply not from ST-LINK/V2-1

Before connecting the USB cable from ST-LINK/V2-1 CN13 to the PC, it is mandatory to
power the board using the user USB OTG FS connector CN9 or the VIN pin of Arduino
connector CN16. Proceeding this way ensures that the enumeration succeeds thanks to the
external power source.

The following power-sequence procedure must be respected:

1. Put a jumper in JP4 at location U5V to use power from user USB CN9 or at location
E5V to use power from VIN of Arduino connector CN16.

2. Connect the corresponding external power source.

3. Check the green LED LD8 is turned On.

4. Connect the PC to ST-LINK/V2-1 USB connector CN13.

If this order is not respected, the board may be powered by VBUS first from ST-LINK, and
the following risks may be encountered:

• If more than 500 mA current is needed by the board, PC may be damaged or current is
limited by PC. As a consequence the board is not powered correctly.

• 500 mA is requested at the enumeration, so there is a risk that the request is rejected
and enumeration does not succeed if PC cannot provide such current.

10.7 Clock sources

Two clock sources are used by STM32L4R9AI: one on LSE input and another on HSE input.

LSE clock source

The available clock source is X1, 32 kHz crystal for the STM32L4R9AI embedded RTC.

HSE clock source

The second clock source available by default is X2, 16 MHz crystal for the STM32L4R9AI
HSE system clock.

Note that another HSE clocking option is available on PCB: MCO output from STLINK MCU
to STM32L4R9AI HSE input. Please refer to

10.8 Reset Source

The general reset of 32L4R9IDISCOVERY is active low. The reset sources are listed below:

• Reset button B1

• Embedded ST-LINK/V2-1, SW1 micro-switch set to On (default setting)

• Arduino compatible connector CN16 pin 3

The general reset is connected to following peripheral reset functions:

• STM32L4R9AI MCU reset

• Octo-SPI Flash reset

• MFX_V3 reset

• Camera reset

Appendix B: Solder bridges.

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10.9 Boot configuration

After reset, STM32L4R9AI boots from one of the three different embedded memory
locations, depending on BOOT0 and BOOT1 bits:

• Boot from the main Flash memory (MCU internal Flash). This is the default
configuration.

• Boot from the system memory ISP (in-system programming).

• Boot from the SRAM1.

On 32L4R9IDISCOVERY board, the boot configuration of the MCU is controlled by the
BOOT0 signal on PH3 pin.

BOOT0 is by default grounded through the R15 pull-down resistor.

It is possible to set BOOT0 high by removing resistor R15 and populating resistor R16 with
a 10K resistor.

Please check below Tab l e 10 for other boot modes.

Table 10. Boot modes

nBOOT1

FLASH_OPTR[23]

XX01

XX01

X1X0

0X11

00X0

1X11

10X0

nBOOT0

FLASH_OPTR[27]

10.10 Audio codec

A Cirrus codec CS42L51-CNZ U26 connected to the SAI1 interface of STM32L4R9AI offers
possibility to connect a stereo headphone or headset with a mono analog microphone.

BOOT0 pin

PH3

nSWBOOT0

FLASH_OPTR[26]

Boot Memory Space Alias

Main Flash memory is selected
as boot area

System memory is selected as
boot area

Main Flash memory is selected
as boot area

Embedded SRAM1 is selected
as boot area

Embedded SRAM1 is selected
as boot area

System memory is selected as
boot area

System memory is selected as
boot area

The I²C-bus addresses of CS42L51-CNZ are 0x95 and 0x94.

10.11 DFSDM

Two ST-MEMS MP34DT01TR digital microphones U1 and U2 are available on
32L4R9IDISCOVERY. The two microphones are located at a distance of 21
other. They are connected to the STM32 DFSDM by the PC2 port, generating the clock, and

24/78 DocID030906 Rev 2

mm from each

UM2271 Hardware layout and configuration

by PB12 port, collecting the PDM interleaved data. These microphones are powered by
MIC_VDD (PH2 of STM32L4R9AI).

The two DFSDM interface signals (clock and data), are also accessible on the STMod+
connector CN1. Before using STMod+, the user must follow the recommendations below:

• If STMod+ pin 17 is used, SB1 (DOUT) must be disconnected first.

• If STMod+ pins 18 or 20 are used, MIC_VDD GPIO (PH2) must be activated at high

level first.

10.12 PSRAM

Two PSRAM footprints are supported on the design, both connected to STM32L4R9AI FMC
interface:

• A 16-Mbit asynchronous PSRAM (U5), using up to A19 address, is soldered by default.
Reference is IS66WV1M16EBLL-55BLI.

• A 32-Mbit synchronous PSRAM (U6), using up to A20 address, may be used.
Reference is IS66WVC2M16ECLL-7010BLI.
By default, this PSRAM (U6) is exclusive with CAMERA function (due to DCMI_D4
function multiplexed with A20 of MCU). In case CAMERA is used at the same time than
PSRAM, it is possible to change two solder bridges to deactivate A20 on PSRAM (tied
to high, usable density 16 Mbits) and DCMI_D4 is used for CAMERA.

Note: Limitation: the two PSRAM are not compatible with JP7 setting at +1V8.

See Appendix B: Solder bridges for possible PSRAM configuration change.

10.13 USB OTG FS

32L4R9IDISCOVERY supports USB OTG FS (full-speed) communication via the USB
Micro-AB connector (CN9) and USB power switch (U16) connected to VBUS. The board
can be powered by this USB connection at 5

A green LED LD6 is lit in one of the following cases:

• Power switch (U16) is On and 32L4R9IDISCOVERY works as a USB host

• VBUS is powered by another USB host when 32L4R9IDISCOVERY works as a USB

device.

The red LED LD7 is lit when over-current occurs.

10.13.1 32L4R9IDISCOVERY as USB device

When the board works as a USB device, it can be powered by the 5 V DC VBUS of this USB
OTG FS connection (jumper JP4 pins 5 and 6 must be connected in position U5V). The
green LEDs LD6 VBUS and LD8 PWR are lit on to confirm the 5

V DC with 625 mA current limitation.

V presence.

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10.13.2 32L4R9IDISCOVERY as USB host

When the board works as a USB host, it supplies the 5 V to the USB peripheral using one of
the following sources:

• ST-LINK/V2-1 USB Micro-B connector CN13 (jumper put in STLK location of JP4)

• an external 5 V source connected to pin 5 of the Arduino connector CN16 (jumper put

in ARD location of JP4)

• an external source between 7 V and 11 V, connected to VIN pin of Arduino connector
CN16 (jumper put in E5V location of JP4)

The green LED LD8 is lit on to confirm the presence of the 5 V source.

The power switch STMPS2141STR is controlled by the port MFX_GPIO13 to deliver the 5 V
power to the USB device connected to the USB connector CN9. When MFX_GPIO13 is
pulled down to ground, the power switch is closed, and the green LED LD6 confirms the 5
presence for the USB device. The red LED LD7 FAULT is lit when an over-current occurs.

For more details please refer to Section 10.6: Power supply.

V

10.14 Octo-SPI Flash memory

A 512-Mbit Octo-SPI user Flash memory (MX25LM51245GXDI00 from MACRONIX) is
connected to OCTOSPIM_P2 interface of STM32L4R9AI. By default, OCTOSPI_RESET of
Flash memory has been connected to the general reset of 32L4R9IDISCOVERY.

See Appendix B: Solder bridges for possible Octo-SPI Flash configuration change.

Note: Limitation: the Octo-SPI Flash memory is not compatible with JP7 setting at +1V8.

10.15 Virtual COM port

The serial interface USART2 is directly available as a virtual COM port of the PC, connected
to the ST-LINK/V2-1 USB connector CN13. The virtual COM port settings are configured as
follow: 115200

bps, 8-bit data, no parity, one stop bit, no flow control.

10.16 Buttons and LEDs

The blue button B2 is a four-directions joystick with a selection mode when pressed in the
center. The logic state is high when one of the five-position switch (left, right, up, down,
selection) is pressed. The center position (Select function) is connected to a wake-up pin of
the microcontroller PC13. The other four directions are mapped on MFX GPIOs.

The black button B1 near the display is the Reset button. It is used to reset the board and
can wake-up MCU from standby and shutdown IDD measurement modes.

Two user LEDs located near the camera connector CN2 are available for the user (see

Figure 4): LD1, LD2, from left to right, with orange and green color respectively. To light on a

LED, a low logic state 0 must be written in the corresponding GPIO.

• LD1 (orange) is managed by MFX function

• LD2 (green) is managed by STM32L4R9AI main MCU

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UM2271 Hardware layout and configuration

Table 11. LD1 and LD2 details

LED MCU port control color

LD1 PB0 (MFX_GPIO0 from MFX) Orange

LD2 PH4 (from main MCU) Green

Other LEDs are present on the 32L4R9IDISCOVERY. Find below a summary list of all
buttons and LEDs, with their description.

Reference Color Function Comment

B1 black RESET For MCU, OCTO-SPI Flash, MFX_V3, CAMERA

B2 blue

LD1 orange USER1 MFX_GPIO0, PB0

LD2 green USER2 PH4

Table 12. Buttons and LEDs

SELECT with Wake-up alternate function, PC13

UP MFX_GPIO1, PB1

DOWN MFX_GPIO2, PB2

RIGHT MFX_GPIO3, PB3

LEFT MFX_GPIO4, PB4

LD3 green ARDUINO PB13

LD4 red/green ST-LINK COM Green during communication

LD5 red ST-LINK USB FAULT Current higher than 625 mA

LD6 green VBUS USB OTG FS Status also available on PA9

LD7 red USB OTG FS OVCR Overcurrent detection, also on MFX_GPIO14, PB14

LD8 green 5V POWER -

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11 Connectors

11.1 Arduino connectors CN10, CN11, CN16 and CN17

CN10, CN11, CN16 and CN17 are female connectors compatible with Arduino Uno
Revision 3 standard. Most of shields designed for Arduino can fit to 32L4R9IDISCOVERY
board.

Left connectors Right connectors

Table 13. Arduino compatible connectors

CN No.

CN16

Power

Pin
No.

1 - - E5V test SPI2_SCK PB13 D13 6

2 IOREF - VDD SPI2_MISO PB14 D12 5

3 NRST NRST Reset

43V3 -

5 5V - 5Vinput/output TIM8_CH1N PH13 D9 2

6 GND - Ground - PH15 D8 1

7 GND - Ground -

8VIN -

1 A0 PA7 ADC1_IN12 TIM5_CH2 PA1 D5 6

Pin

Name

MCU

Pin

-

- TIM3_CH1 PB4 D6 7

Function Function

I2C3_SCL PG7 D15 10

I2C3_SDA PG8 D14 9

AVD D - AVDD 8

Ground - GND 7

TIM3_CH2,

SPI2_MOSI

3V3output

(note 1)

+6V to +9V

power input

(note 2)

TIM5_CH4,

SPI2_NSS

-

-PA4D78

MCU

Pin

PB15 D11 4

PI0 D10 3

Pin

Name

Pin
No.

CN No.

CN10

Digital

2 A1 PC4 ADC1_IN13 - PG6 D4 5

3 A2 PC3 ADC1_IN4 TIM15_CH2 PF10 D3 4

4 A3 PB0 ADC1_IN15 - PG11 D2 3

CN17

Analog

5A4

PA0 or

PG8

(note 3)

PA5 or

6A5

28/78 DocID030906 Rev 2

PG7

(note 3)

ADC1_IN5

or

I2C3_SDA

(note 3)

ADC1_IN10

or

I2C3_SCL

(note 3)

LPUART1_TX PC1 D1 2

LPUART1_RX PC0 D0 1

CN11

Digital

UM2271 Connectors







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1. The 3V3 on ARD connector PIN4 is not a power input for 32L4R9IDISCOVERY board, to simplify power architecture.

2. The external voltage applied to pin VIN should be in the range 6 to 9V at 25°C ambient temperature. If a higher voltage is
applied on the regulator U15, it may overheat and could be damaged.

3. By default, pin 5 and pin 6 of CN17 connector are connected to ADC MCU input ports PA0 and PA5 respectively, thanks to
configuration of solder bridges: SB33 and SB35 closed, SB32 and SB34 opened. In case it is necessary to connect I2C
interface signals on pins 5 and 6 of CN17 instead of ADC inputs, open SB33 and SB35, and close SB32 and SB34.

VREF+, the voltage reference used by the internal DAC and ADC of STM32L4R9AI, has
three different power sourcing capabilities:

• from STM32L4R9AI MCU Internal buffer generation (Default). VREFBUF internal ADC
/ DAC voltage reference is set to 2.5V by default.

• from an external Arduino shield, connected to connector CN10. In that case, SB27
needs to be connected to bring AVDD on VREF+, a 100nF is necessary on C48 and
VREFBUF needs to be de-activated.

• from a VDDA power supply generated on 32L4R9IDISCOVERY board. VDDA is also
connected to VDDUSB of STM32L4R9AI. In that case, mounting a 0 ohm resistor on
R14 is necessary. VREFBUF needs to be de-activated. A jumper JP3 also needs to be
set as below description.

Jumper Setting Description

Table 14. JP3, VDDA and VDDUSB, settings

Default setting.

JP3

Jumper on PIN1/2, VDDA get power from +3V3

VDDA
Setting

Jumper on PIN2/3, VDDA get power form VDD_MCU
(See warning below)

Warning: When VDDA=VDD_MCU and if VDD_MCU=1.8 V (check JP7

setting), there will be huge leakage current and a risk of
damaging MCU I/Os in case 3.3 V logic level is connected to
ADC input I/Os of STM32L4R9AI. Also, ADC measurements
will not be functional in default configuration

Caution: The I/Os of STM32 microcontroller are 3V3 compatible instead of 5 V for Arduino Uno.

Note: Limitation: the Arduino Uno Revision 3 is not compatible with JP7 setting at +1V8.

See Appendix B: Solder bridges for possible Arduino configuration change.

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11.2 DSI display, backlight and touch panel connector CN4

All the necessary signals to interface with round DSI display board are available through the
DSI V3 connector CN4.

Figure 10. DSI display connector CN4

Function GPIO port Signal name

General ground - GND 1 2 NC - -

Differential DSI

clock

Differential DSI

clock

General ground - GND 7 8 DSI_D2_P -

Differential DSI

data 0

General ground - GND 13 14 DSI_D3_P -

Differential DSI

data 1

- DSI_CK_P 3 4 TOUCH_INT MFX_GPIO9

- DSI_CK_N 5 6 GND -

- DSI_D0_P 9 10 DSI_D2_N -

-DSI_D0_N1112GND -

- DSI_D1_P 15 16 DSI_D3_N -

-DSI_D1_N1718GND -

General ground - GND 19 20 NC - -

Power output - +5v 21 22 SPI_CS PH14

Table 15. DSI display connector CN4

CN6 pin
number

Signal name GPIO port Function

Touch panel

interrupt

General

ground

reference

Not

connected

Not

connected

General

ground

Not

connected

Not

connected

General

ground

SPI chip

select

30/78 DocID030906 Rev 2

UM2271 Connectors

Table 15. DSI display connector CN4 (continued)

Function GPIO port Signal name

Power output - +5v 23 24 SPI2_SCK PB13 SPI clock

- - NC 25 26 SPI2_MOSIp PB15 SPI data

SM3321 ground - BLGND 27 28 SPI_DCX PB14

SM3321 ground - BLGND 29 30 NC - -

- - NC 31 32 RESERVED - -

- - NC 33 34 NC - -

- - NC 35 36 3V3 -

- - NC 37 38 VDDIO -

- - NC 39 40 I2C1_SDA PG13

- - NC 41 42 NC - -

DSI_SWIRE

control output

- - NC 45 46 NC - -

- - NC 47 48 NC - -

DSI tearing

effect input

PA8 DSI_SWIRE 43 44 I2C1_SCL PB6

PF11 TE 49 50 NC - -

CN6 pin
number

Signal name GPIO port Function

SPI

data/control

3V3 voltage

reference

IOVDD

reference

Touch panel

I2C data

Touch panel

I2C clock

- - NC 51 52 NC - -

DSI Backlight
control output

- - NC 55 56 NC - -

DSI and Touch

panel Reset

output

- - NC 59 60 1V8 -

General ground - GND 61 62 GND -

General ground - GND 63 64 GND -

PB1 DSI_BL_CTRL 53 54 NC - -

MFX_

GPIO10

DSI_RESET 57 58 NC - -

See Appendix B: Solder bridges for possible DSI display configuration change.

1.8V voltage
reference

General

ground

General

ground

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11.2.1 DSI AMOLED display

Warning: Permanent image sticking may occur if AMOLED displays

same image for an extended period of time.

The DSI display is based on a round AMOLED Touch sensitive panel of 1.2 inch and
390x390
Optoelectronics. It displays up to 16M colors. The round DSI display module board
reference is MB1314. The DSI interface of MB1314 is only one data-lane width and a clock
lane, but the 32L4R9IDISCOVERY board supports DSI displays with up to two data-lane
width. The DSI_V3 connector interface also enables the use of dedicated low power modes
of display, thanks to the available SPI2 interface (MB1314 does not use it). It is also possible
to use some of USART3 signals to control a low power mode (SB6 and SB8 are respectively
exclusive with SB13 and SB7).

The DSI_TE signal PF11 is used as an input of the main microcontroller connected to the
display signal TE (tearing effect). DSI_TE signal is used to synchronize the refresh of the
display memory by the microcontroller with the display scan, this to avoid visible artefacts.

DSI_3V3_PWRON signal (MFX_GPIO8, low level active) controls the 3V3 level Power
supplies provided on the DSI_V3 connector interface. DSI_1V8_PWRON signal
(MFX_aGPIO2) controls the 1V8 level Power supplies provided on the DSI_V3 connector
interface. Both shall be used to enable or disable display, TP and PSRAM. They allows to
disconnect those peripherals when doing low power IDD measurement.

pixels. The display module reference is IEG1120TB103GF-001 from Govisionox

DSI_RESET signal (MFX_GPIO10, low level active) controls the reset for the display and
the Touch panel.

An optional DSI_SWIRE signal PA8 offers additional possibility to control the voltage for any
display supply during initialization (not used by MB1314 by default). PA8 is exclusive with
another function from 32L4R9IDISCOVERY board: CAMERA clock Interface (MCO), which
is the default setting.

11.2.2 Backlight and OLED power supplies generation

This function is handled by the Power driver circuit SM3321, included on the MB1314 DSI
display Board. SM3321 is a switching mode boost converter supplied by the 3V3 rail of the
DSI_V3 connector interface. SM3321 is controlled either by the AMOLED driver circuit itself
(default configuration), either by DSI_BL_CTRL (PB1) from main MCU, either from the
DSI_SWIRE (PA8) interface from main MCU. SM3321 provides all necessary voltage
references to AMOLED display.

If used, the signal DSI_BL_CTRL switches on the backlight with a high level. It is possible to
dim the backlight intensity by applying a low frequency PWM signal to DSI_BL_CTRL (1 to
10

kHz typically).

11.2.3 Touch panel

The touch panel is a capacitive touch panel using an I2C interface. The touch panel IC
reference is FT3267, and is located on the MB1314 board. The FT3267 I2C1 default
addresses are 0x71 and 0x70.

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Touch panel interrupt output DSI_TOUCH_INT is connected to MFX_GPIO9. It is used as
touch panel detection indication. MFX_GPIO10 resets capacitive touch panel and DSI
display.

11.3 USB OTG FS connector CN9

An USB OTG full speed communication link is available at USB Micro AB receptacle
connector CN9. Micro AB receptacle enables USB Host and USB Device features.

MFX_GPIO13 is used to enable on-board VBUS power when in Host mode.

Figure 11. USB OTG FS Micro-AB connector CN9

Pin number Description Pin number Description

1 VBUS (PA9) 4 ID (PA10)

2DM (PA11) 5GND

3 DP (PA12) - -

Table 16. USB OTG FS Micro-AB connector CN9

11.4 ST-LINK/V2-1 USB Micro-B connector CN13

The USB connector CN13 is used to connect the embedded ST-LINK/V2-1 to the PC.

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Figure 12. USB Micro-B connector CN13

Pin number Description Pin number Description

1 VBUS (power) 4 GND

2 DM 5,6 Shield

3DP --

Table 17. USB Micro-B connector CN13

11.5 microSD card connector CN6

microSD cards with 4 GBytes or more capacity are inserted in the receptacle CN6. Four
data bits of the SDMMC1 interface, CLK and CMD signals of the STM32L4R9AI are used to
communicate with the microSD card at +3V3 only. The card insertion is detected by the
MFX_GPIO5: when a microSD card is inserted, the logic level is 0, otherwise it is 1.

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UM2271 Connectors

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Figure 13. microSD connector CN6 (top view)

Pin

number

1 SDMMC1_D2 (PC10) 6 GND

2 SDMMC1_D3 (PC11) 7 SDMMC1_D0 (PC8)

3 SDMMC1_CMD (PD2) 8 SDMMC1_D1 (PC9)

4 VDD (+3V3) 9 µSD_DETECT (MFX_GPIO5)

5 SDMMC1_CLK (PC12) 10-11-12 GND (casing)

Table 18. microSD connector CN6

Description

Pin

number

Note: Limitation: the microSD is not compatible with JP7 setting at +1V8.

11.6 STMod+ connector CN1

The standard 20-pin STMod+ connector is available on 32L4R9IDISCOVERY board to
increase compatibility with external boards and modules from the Ecosystem of
microcontrollers. By default, it is designed to support an ST dedicated Fanout board which
allows connecting different modules or board extensions from different manufacturers.
Fanout board also embeds a 3V3 regulator and I2C level shifters. Schematics of Fanout
board is available in

Figure 35.: Fanout board (MB1280). For more detailed information,

Description

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please refer to ST Fanout board user manual and to relevant datasheets of associated
modules.

For details about STMod+ interface, please refer to STMod+ connector interface
specification.

Figure 14. STMod+ connector CN1

Pin

number

Table 19. STMod+ connector CN1

Description

Pin

number

Description

1 SPI2_CS/USART3_CTS (PA6) 11 INT (PC6)

2 SPI2_MOSIp/USART3_TXD (PB15/PB10) 12 RST (PI7)

3 SPI2_MISOp/USART3_RXD (PB14/PB11) 13 ADC (PA4)

4 SPI2_SCK/USART3_RTS (PB13/PA15) 14 PWM (PA5)

5GND15+5V

6 +5V 16 GND

7 I2C3_SCL (PG7) 17 GPIO (PB12)

8 SPI2_MOSIs (PI3) 18 GPIO (PC2)

9 SPI2_MISOs (PI2) 19 GPIO (PC7)

10 I2C3_SDA (PG8) 20 GPIO (PC2)

In order to be able to support selection of SPI or UART functions connection on STMod+ by
software, a quad SPDT switch has been added. It is controlled by two GPIOs from MFX
circuit and enables MCU signal selection for pins 2, 3 and 4. By default, STMod+ connector
is selected, and STMOD+_SEL_0 and STMOD+_SEL_1 of MFX circuit are set to support
one of the STMod+ interface configuration.

Pin number SPI UART / SPI

Table 20. Quad SPDT switch configuration

(1)

UART

STMOD+_SEL_0 (GPIO6 of MFX_V3) 0 1 1

STMOD+_SEL_1 (GPIO7 of MFX_V3) 0 0 1

STMod+ pin 1 (directly connected to PA6) SPI_CS SPI_CS USART3_CTS

STMod+ pin 2 SPI2_MOSIp USART3_TX USART3_TX

36/78 DocID030906 Rev 2

UM2271 Connectors

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Table 20. Quad SPDT switch configuration (continued)

Pin number SPI UART / SPI

STMod+ pin 3 SPI2_MISOp USART3_RX USART3_RX

STMod+ pin 4 SPI2_SCK SPI2_SCK USART3_RTS

1. UART / SPI defines default configuration for STMOD+_SEL_0 and STMOD+_SEL_1.

(1)

UART

Please, take care that this connector shares many GPIOs with other functions on the Board:
for more detailed information please refer to

Appendix A: GPIO assignment and sharing.

In addition, to have a quick look at STMod+ GPIO sharing and multiplexing, and to get a
quick view on other Alternate functions available on its pins, please refer to

Appendix C:

STMod+ GPIO sharing and multiplexing.

Note: Limitation: The STMod+ interface is not compatible with JP7 setting at +1V8.

Note: Limitation: if STMod+ pin 17 is used, please take care to disconnect SB1 first. If STMod+ pin

18/20 is used, please activate MIC_VDD GPIO (PH2) at high level first.

11.7 PMOD connector CN3

The standard 12-pin PMOD connector is available on STM32L4R9I-DISCO Discovery board
to support low frequency, low I/O pin count peripheral modules. The PMOD interface which
has been implemented on STM32L4R9I-DISCO Discovery board is compatible with the
PMOD type 2A & 4A I/O signal assignment convention.

Figure 15. PMOD connector CN3

Pin number Description Pin number Description

1 SPI2_CS/USART3_CTS (PA6) 7 INT (PC6)

2 SPI2_MOSIp/USART3_TXD (PB15/PB10) 8 RESET (PI7)

3 SPI2_MISOp/USART3_RXD (PB14/PB11) 9 NA

4 SPI2_SCK/USART3_RTS (PB13/PA15) 10 NA

5GND 11GND

Table 21. PMOD connector CN3

63V3 123V3

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Connectors UM2271

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In order to be able to support selection of SPI or UART functions connection on PMOD by
software, a quad SPDT switch has been added on board. It is controlled by two GPIOs from
MFX_V3 circuit and enables MCU signal choice for pins 2, 3 and 4: refer to

Tabl e 20

STMod+ chapter for switch description details (pin 1, 2, 3 and 4 of PMOD are common with
STMod+).

By default, STMod+ connector is selected, so STMOD+_SEL_0 and STMOD+_SEL_1
needs to be modified to support one of the PMOD interface configuration. Also, PMOD
shares GPIOs with other functions of the Board: for more detailed information please refer
to

Appendix A: GPIO assignment and sharing.

Note: Limitation: the PMOD interface is not compatible with JP7 setting at +1V8.

11.8 Camera module connector CN2

An 8-bit camera module function is supported thanks to the 30-pin dedicated ZIF connector
CN2. The reference of camera module to be used is STM32F4DIS-CAM. This module has
to be connected with caution before powering on the STM32L4R9I-DISCO Discovery board.
The camera module I²C addresses are 0x61 and 0x60. Camera can be used by default, but
one might take care about GPIO sharing and multiplexing with other function, in order to
program the good configuration. For more detailed information please refer to

GPIO assignment and sharing.

Appendix A:

Note: Limitation: the camera is not compatible with JP7 setting at +1V8.

Figure 16. Camera module connector CN2

Pin number Description Pin number Description

1GND 16GND

2 NC 17 DCMI_HSYNC (PA4)

3NC 18NC

4 DCMI_D0 (PC6) 19 DCMI_VSYNC (PI5)

5 DCMI_D1 (PC7) 20 VDD

6 DCMI_D2 (PH11) 21 DCMI_CLK (PA8)

Table 22. Camera module connector CN2

7 DCMI_D3 (PH12) 22 NC

8 DCMI_D4 (PE4) 23 GND

9 DCMI_D5 (PI4) 24 NC

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UM2271 Connectors

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Table 22. Camera module connector CN2 (continued)

Pin number Description Pin number Description

10 DCMI_D6 (PB8) 25 DCMI_PWR_EN (MFX_GPIO12)

11 DCMI_D7 (PI7) 26 DCMI_NRST (NRST from MCU)

12 NC 27 I2C1_SDA (PG13)

13 NC 28 I2C1_SCL (PB6)

14 GND 29 GND

15 DCMI_PIXCK (PH5) 30 VDD

11.9 TAG connector CN8

The TAG connector footprint CN8 is used to connect STM32L4R9AI microcontroller for
programming or debugging the board.

Figure 17. TAG connector CN8

Pin number Description Pin number Description

1 VDD 10 NRST (PH3, RESET#)

2 SWDIO (PA13) 9 NA

3GND 8NA

4 SWCLK (PA14) 7 NA

5GND 6SWO (PB3)

11.10 SWD header CN5

The 6-pin SWD header is used to program or debug an MCU in an external application
board using a dedicated cable connected to it. To use this SWD header interface, pins 2 and
3 of JP10 need to be connected with a jumper. Furthermore, SW1 must be set in OFF
position while R24 and R31 need to be disconnected.

By default, STLINK/V2-1 is used to program or debug on board MCU. Pin1 and 2 of JP10
are connected, SW1 is in ON position, R24 and R31 are connected.

Table 23. TAG connector CN8

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Connectors UM2271

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)URQWYLHZ

Table 24. SWD header CN5

Pin number Description Pin number Description

1 VDD 4 SWDIO (PA13)

2 SWCLK (PA14) 5 NRST

3GND 6SWO (PB3)

11.11 EXT_I2C connector CN7

The EXT_I2C connector socket is used to connect external modules to I2C1 interface or to
monitor the I2C1 interface.

Figure 18. EXT_I2C connector CN7

Table 25. EXT_I2C connector CN7

Pin number Description Pin number Description

1 I2C1_SDA (PG13) 5 +3V3

2NC 6NC

3 I2C1_SCL (PB6) 7 GND

4 EXT_RESET (MFX_GPIO11) 8 NC

As I2C1 is available for external use, it is important to note that those following I2C1
applications and addresses are already used on board:

Application

DSI display Touch Panel 0x71/0x70 400 kHz Default I2C address

Audio Codec 0x95/0x94 100 kHz Default I2C address

CAMERA 0x61/0x60 400 kHz For STM32F4DIS-CAM Module

MFX_V3 0x85/0x84 400 kHz Default I2C address

Table 26. I2C1 addresses (on board)

W/R I2C
address

I2C max. speed Comment

Depending on the I2C module plugged into CN7, I2C1 could even be used up to
Fast mode + (1 MHz).

40/78 DocID030906 Rev 2

UM2271 Connectors

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ϯ

Ϯ

ϲ

ϰ

ϱ

ϭ

11.12 Stereo headset and headphone jack CN12

A stereo headphone or a stereo headset with analog microphone is pluggable into the

3.5

mm standard jack socket CN12.

Figure 19. Stereo headset with microphone jack CN12

Pin number Description Stereo headset with microphone pinning

6 OUT_Left SPK_L (33 ohms typ.)

4 OUT_Right SPK_R (33 ohms typ.)

3GND GND

2 IN_Analog Microphone

5NC

1NC

Table 27. Audio jack connector CN12

NA

If a headset is plugged into CN12, the bias of the microphone is driven by the output
MICBIAS1 of the codec and the analog audio enters into the codec by the pin AIN3A.

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42/78 DocID030906 Rev 2

Appendix A GPIO assignment and sharing

GPIO assignment and sharing UM2271

Table 28. 32L4R9IDISCOVERY GPIO assignment and sharing

Pin GPIO port GPIO primary interface STMod+ interface PMOD interface ARDUINO interface

K3 PA0 - - - ARD_A4 (ADC1_IN5)

M1 PA1 - - - ARD_D5 (TIM5_CH2)

N1 PA2 STLINK_USART2_TX - - -

M2 PA3 STLINK_USART2_RX - - -

N2 PA4

L3 PA5 -

L4 PA6 -

DCMI_HSYNC/DE STMod+_ADC (ADC_1_IN9) - ARD_D7

STMod+_PWM (TIM2_CH1) - ARD_A5 (ADC1_IN10)

STMod+_SPI2_CS //

STMod+_USART3_CTS

(NU)

PMOD_SPI2_CS //

PMOD_USART3_CTS

(NU)

-

M4 PA7 - - - ARD_A0 (ADC1_IN12)

(NU)

//

-- -

E11 PA8

DSI_SWIRE
DCMI_CLK (MC0)

E12 PA9 VBUS - - -

D11 PA10 ID - - -

E13 PA11 DM - - -

D13 PA12 DP - - -

A11 PA13 JTMS/SWDIO - - -

A10 PA14 JTCK/SWCLK - - -

A9 PA15 - STMod+_USART3_RTS

(NU)

(NU)

(NU)

//

--ARD_A3 (ADC1_IN15)

-- -

N4 PB0 DSI_USART3_CK

L5 PB1

DSI_BL_CTRL

DSI_SWIRE

(NU)

PMOD_USART3_RTS

(NU)

N5 PB2 MFX_WAKEUP_OUT - - -

-

Table 28. 32L4R9IDISCOVERY GPIO assignment and sharing (continued)

Pin GPIO port GPIO primary interface STMod+ interface PMOD interface ARDUINO interface

A6 PB3 JTDO/TRACESWO - - -

A5 PB4 - - - ARD_D6 (TIM3_CH1)

B5 PB5 SAI1_SD_B - - -

C5 PB6 I2C1_SCL - - -

D5 PB7 PSRAM_NL (ADV) - - -

C4 PB8 DCMI_D6

(NU)

D4 PB9 SAI1_FS_A - - -

N9 PB10

DSI_USART3_TX

(NU)

STMod+_USART3_TX PMOD_USART3_TX -

-- -

UM2271 GPIO assignment and sharing

DocID030906 Rev 2 43/78

H7 PB11 -

N12 PB12

N13 PB13

M12 PB14

L10 PB15

DFSDM_1_DATIN1 STMod+_GPIO

DSI_SPI2_SCK

DSI_SPI_D/CX

DSI_SPI2_MOSI

(NU)

(NU)

(NU)

STMod+_USART3_RX PMOD_USART3_RX -

(NU)

--

STMod+_SPI2_SCK PMOD_SPI2_SCK ARD_D13 (SPI2_SCK)

STMod+_SPI2_MISOp

STMod+_SPI2_MOSIp

(NU)

(NU)

PMOD_SPI2_MISO

PMOD_SPI2_MOSI

(NU)

(NU)

ARD_D12 (SPI2_MISO)

ARD_D11 (SPI2_MOSI_TIM3_CH2)

J2 PC0 - - - ARD_D0 (LPUART1_RX)

J3 PC1 - - - ARD_D1 (LPUART1_TX)

J4 PC2

DFSDM_1_CKOUT STMod+_GPIO

(NU)

--

K1 PC3 - - - ARD_A2 (ADC1_IN4)

K4 PC4 - - - ARD_A1 (ADC1_IN13)

F11 PC6

G11 PC7

DCMI_D0 STMod+_INT PMOD_INT -

DCMI_D1 STMod+_GPIO - -

F9 PC8 SDMMC_1_D0 - - -

G13 PC9 SDMMC_1_D1 - - -

D9 PC10 SDMMC_1_D2 - - -

E9 PC11 SDMMC_1_D3 - - -

F8 PC12 SDMMC_1_CK - - -

44/78 DocID030906 Rev 2

Table 28. 32L4R9IDISCOVERY GPIO assignment and sharing (continued)

Pin GPIO port GPIO primary interface STMod+ interface PMOD interface ARDUINO interface

E1 PC13 JOY_SEL // WAKEUP - - -

F1 PC14-OSC32_IN PC14-OSC32_IN - - -

GPIO assignment and sharing UM2271

G1

B8 PD0 PSRAM_D2 - - -

C8 PD1 PSRAM_D3 - - -

D8 PD2 SDMMC_1_CMD - - -

E8 PD3 PSRAM_CLK - - -

C7 PD4 PSRAM_NOE - - -

D7 PD5 PSRAM_NWE - - -

E7 PD6 PSRAM_NWAIT - - -

F7 PD7 PSRAM_NE1 - - -

K10 PD8 PSRAM_D13 - - -

K9 PD9 PSRAM_D14 - - -

J10 PD10 PSRAM_D15 - - -

J9 PD11 PSRAM_A16 - - -

J8 PD12 PSRAM_A17 - - -

H8 PD13 PSRAM_A18 - - -

H11 PD14 PSRAM_D0 - - -

H10 PD15 PSRAM_D1 - - -

A4 PE0 PSRAM_NBL0 - - -

B4 PE1 PSRAM_NBL1 - - -

PC15-

OSC32_OUT

PC15-OSC32_OUT - - -

D3 PE2 SAI1_MCLK_A - - -

D2 PE3 PSRAM_A19 - - -

D1 PE4

PSRAM_A20

(NU)

// DCMI_D4 - - -

DocID030906 Rev 2 45/78

Table 28. 32L4R9IDISCOVERY GPIO assignment and sharing (continued)

Pin GPIO port GPIO primary interface STMod+ interface PMOD interface ARDUINO interface

E4 PE5 SAI1_SCK_A - - -

E3 PE6 SAI1_SD_A - - -

L7 PE7 PSRAM_D4 - - -

K6 PE8 PSRAM_D5 - - -

J6 PE9 PSRAM_D6 - - -

H6 PE10 PSRAM_D7 - - -

N8 PE11 PSRAM_D8 - - -

M8 PE12 PSRAM_D9 - - -

L8 PE13 PSRAM_D10 - - -

K7 PE14 PSRAM_D11 - - -

J7 PE15 PSRAM_D12 - - -

F5 PF0 PSRAM_A0 - - -

F4 PF1 PSRAM_A1 - - -

F3 PF2 PSRAM_A2 - - -

G3 PF3 PSRAM_A3 - - -

G4 PF4 PSRAM_A4 - - -

G5 PF5 PSRAM_A5 - - -

UM2271 GPIO assignment and sharing

H4 PF10 - - - ARD_D3 (TIM15_CH2)

M5 PF11 DSI_TE - - -

N6 PF12 PSRAM_A6 - - -

M6 PF13 PSRAM_A7 - - -

L6 PF14 PSRAM_A8 - - -

K5 PF15 PSRAM_A9 - - -

J5 PG0 PSRAM_A10 - - -

H5 PG1 PSRAM_A11 - - -

46/78 DocID030906 Rev 2

Table 28. 32L4R9IDISCOVERY GPIO assignment and sharing (continued)

Pin GPIO port GPIO primary interface STMod+ interface PMOD interface ARDUINO interface

H9 PG2 PSRAM_A12 - - -

G8 PG3 PSRAM_A13 - - -

G7 PG4 PSRAM_A14 - - -

G9 PG5 PSRAM_A15 - - -

G12 PG6 - - - ARD_D4

GPIO assignment and sharing UM2271

G10 PG7 -

F10 PG8 -

B7 PG9 OCTOSPIM_P2_IO6 - - -

D6 PG10 OCTOSPIM_P2_IO7 - - -

E6 PG11 - - - ARD_D2

F6 PG12 OCTOSPIM_P2_NCS - - -

G6 PG13 I2C1_SDA - - -

C6 PG15 OCTOSPIM_P2_DQS - - -

H1 PH0-OSC_IN PH0-OSC_IN - - -

J1 PH1-OSC_OUT PH1-OSC_OUT - - -

A2 PH2 MIC_VDD - - -

E5 PH3-BOOT0 PH3-BOOT0 - - -

K8 PH4 LED_GREEN - - -

L9 PH5 DCMI_PIXCLK/PDCK - - -

N10 PH8 OCTOSPIM_P2_IO3 - - -

C11 PH9 OCTOSPIM_P2_IO4 - - -

M9 PH10 OCTOSPIM_P2_IO5 - - -

M10 PH11 DCMI_D2 - - -

B13 PH12 DCMI_D3 - - -

C9 PH13 - - - ARD_D9 (TIM8_CH1N)

STMod+_I2C3_SCL - ARD_D15 (I2C3_SCL)

STMod+_I2C3_SDA - ARD_D14 (I2C3_SDA)

DocID030906 Rev 2 47/78

Table 28. 32L4R9IDISCOVERY GPIO assignment and sharing (continued)

Pin GPIO port GPIO primary interface STMod+ interface PMOD interface ARDUINO interface

A13 PH14 DSI_SPI_USART_CS

B12 PH15 - - - ARD_D8

A12 PI0 - - - ARD_D10 (SPI2_NSS_TIM5_CH4)

B11 PI1 MFX_INT_IN - - -

B10 PI2 - STMod+_SPI2_MISOs - -

C10 PI3 - STMod+_SPI2_MOSIs - -

D10 PI4 DCMI_D5 - - -

E10 PI5 DCMI_VSYNC/RDY - - -

B9 PI6 OCTOSPIM_P2_CLK - - -

B2 PI7

DCMI_D7 STMod+_RST PMOD_RST -

B1 PI9 OCTOSPIM_P2_IO2 - - -

A1 PI10 OCTOSPIM_P2_IO1 - - -

C3 PI11 OCTOSPIM_P2_IO0 - - -

Legend:

or = Indicate shared or exclusive functions or interfaces on a GPIO port
(NU) = Function mode which is not usable by default
// = Highlights two exclusive functions available for one interface
(xxx) = Name of the STM32L4R9AI GPIO Alternate function used on this interface

(NU)

-- -

UM2271 GPIO assignment and sharing

48/78 DocID030906 Rev 2

Table 29. MFX_V3 GPIO assignment (LQFP48)

Pin GPIO port Implemented functions Application function name

10 PA0-WKUP - -

11 PA1 MFX_aGPIO1 MFX_aGPIO1

12 PA2 MFX_aGPIO2 DSI_1V8_PWRON

13 PA3 - -

14 PA4 Reserved DAC_Out1 SPARE

15 PA5 MFX_GPIO5 µSD_DETECT

16 PA6 MFX_GPIO6 STMOD+_SEL_0

17 PA7 MFX_GPIO7 STMOD+_SEL_1

29 PA8 MFX_GPIO8 DSI_3V3_PWRON

30 PA9 MFX_GPIO9 DSI_TOUCH_INT

31 PA10 MFX_GPIO10 DSI_RESET

32 PA11 MFX_GPIO11 EXT_RESET

33 PA12 MFX_GPIO12 DCMI_PWR_EN

34 PA13 MFX_SWDIO MFX_SWDIO

37 PA14 MFX_SWCLK MFX_SWCLK

38 PA15 MFX_IDD_SH3 SH3

GPIO assignment and sharing UM2271

18 PB0 MFX_GPIO0 LED_ORANGE

19 PB1 MFX_GPIO1 JOY_UP

20 PB2 MFX_GPIO2 JOY_DOWN

39 PB3 MFX_GPIO3 JOY_RIGHT

40 PB4 MFX_GPIO4 JOY_LEFT

41 PB5 MFX_IDD_VDD_MCU IDD_VDD_MCU

42 PB6 MFX_I2C_SCL I2C1_SCL from main MCU

43 PB7 MFX_I2C_SDA I2C1_SDA from main MCU

45 PB8 MFX_I2C_ADDR I2C_ADDR (external pull-down)

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Table 29. MFX_V3 GPIO assignment (LQFP48) (continued)

Pin GPIO port Implemented functions Application function name

46 PB9 MFX_IRQ_OUT MFX_IRQ_OUT

21 PB10 - -

22 PB11 - -

25 PB12 MFX_IDD_MEAS IDD_MEAS

26 PB13 MFX_GPIO13 USB_OTGFS_PPWR_EN

27 PB14 MFX_GPIO14 USB_OVER

28 PB15 MFX_GPIO15 AUDIO_Codec_RESET

2 PC13-ANTI_TAMP MFX_WAKEUP MFX_WAKEUP

3 PC14-OSC32_IN MFX_IDD_CAL CAL

4 PC15-OSC32_OUT MFX_IDD_SH0 SH0

5 PH0-OSC_IN MFX_IDD_SH1 SH1

6 PH1-OSC_OUT MFX_IDD_SH2 SH2

UM2271 GPIO assignment and sharing

50/78 DocID030906 Rev 2

Appendix B Solder bridges

Following Tabl e 30 describes each solder bridge. The default state is indicated in bold. ON state means a 0 ohm resistor is
soldered. OFF state means SBxx is open.

Solder bridges State Description

Solder bridges UM2271

Table 30. 32L4R9IDISCOVERY solder bridges

SB2 (ARD_D13 Green LED)

SB27 (ARD_AVDD on VREF+)

SB32, SB34 (I2C3 on ARD_A4/A5) OFF I2C3 disconnected from ARD_A4/A5, exclusive with SB33, SB35

SB33, SB35 (ADCs on ARD_A4/A5) ON ADCs inputs connected to ARD_A4/A5, exclusive with SB32, SB34

SB7, SB13 (USART3 on DSI display) OFF Disconnects USART3_CK/TX from pins 24/26 of DSI V3 connector, exclusive with SB6 and SB8

SB6, SB8 (SPI2 on DSI display) ON Connects SPI2_SCK/MOSI to pins 24/26 of DSI V3 connector, exclusive with SB7 and SB13

SB23 (VDD on OCTOSPI Flash)

SB25 (OCTOSPI_ECS)

SB24 (OCTOSPI_RESET)

SB1 (DFSDM_1_DATIN1)

SB3 (RESERVED) ON Reserved, but can be removed if necessary (PSRAM_A20 to U6)

SB4 (RESERVED) OFF Reserved, do not modify (PSRAM_A20 to VDD)

SB16, SB17, SB18, SB19, SB20, SB21
(RESERVED)

ON Enables ARD Green LED control by ARD_D13

OFF Disables ARD Green LED

ON Connects VREF+ from MCU to ARD_AVDD

OFF ARD_AVDD not connected

ON Connects OCTOSPI Flash power rails to VDD

OFF Disconnects VDD from OCTOSPI Flash

ON ECS function active (need external pull-up)

OFF ECS function not active (no external pull-up)

ON OCTOSPI Flash Reset is connected to General Reset of Board

OFF OCTOSPI Flash Reset not connected to General Reset of Board

ON PB12 (DFSDM_1_DATIN1) is connected to Digital Microphones by default

OFF PB12 (DFSDM_1_DATIN1) is usable by STMod+ on pin 17

OFF Reserved, (STMod+/PMOD)

SB36 (RESERVED) OFF Reserved, (STLINK)

Table 30. 32L4R9IDISCOVERY solder bridges (continued)

Solder bridges State Description

SB5 (RESERVED) ON Reserved, do not modify (PSRAM)

SB14 (RESERVED) ON Reserved, do not modify (STLINK)

UM2271 Solder bridges

DocID030906 Rev 2 51/78

SB9, SB10, SB11, SB12
(RESERVED)

SB15 (RESERVED) ON Reserved, (USB OTG FS)

SB30 (RESERVED) ON Reserved, (Audio Codec VL)

SB29 (RESERVED) ON Reserved, (Audio Codec VD)

SB31 (RESERVED) ON Reserved, do not modify (MFX, IDD_VDD_MCU)

SB22 (RESERVED) ON Reserved, do not modify (STMod+/PMOD)

SB26 (RESERVED) ON Reserved, (OCTOSPI Flash)

SB37 (RESERVED) ON Reserved, (EXT_I2C)

SB28 (RESERVED) OFF Reserved, (MCO to HSE input)

SB38 (RESERVED) ON Reserved, (for U5 PSRAM)

SB39 (RESERVED) OFF Reserved, (for U6 PSRAM)

ON Reserved, do not modify (display)

52/78 DocID030906 Rev 2

Appendix C STMod+ GPIO sharing and multiplexing

STMod+ GPIO sharing and multiplexing UM2271

Shared or exclusive functions STMod+

DSI ARD PMOD Some other Alternate Functions

- -

TXS3

MOSI2

MOSI2/T15.2

DC/X MISO2

SCK2 SCK2

- - - - GND - GND 5 15 +5V - +5V - - - - -

- - - - +5V - +5V 6 16 GND - GND - - - - -

- SCL3 - DF1.CO / LTX1 SCL3 - PG7 7 17 PB12 - GPIO

- - - T8.E MOSI2 - PI3 8 18 PC2* - GPIO DF1.CO / MISO2 / LT1.2 / [AD1.3] - - - DF1.CO

- - - T8.4 MISO2 - PI2 9 19 PC7 - GPIO T3.2 / T8.2 / DF1.D3 - - D1 -

- SDA3 - LRX1 SDA3 - PG8 10 20 PC2* - GPIO same as pin 18 - - - DF1.CO

Legend:

= DSI = Arduino Uno = Pmod = Alternate Functi ons = STMod+ = CAM = Digital Microp hone = Supply = GND

1. This Table 31 gives description of the signals available on the STMod+ connector
It also shows which signal is shared with other board connector or function
In some boards, Solder bridges (SB) are present to manually select which function is wired by default (but here, please refer to point (3) below)
Analog signals are in brackets [xxx]
The I2C bus on pins 7 / 10 might be shared with built-in discovery slave devices. Please check the slave address of your device when adding it to the bus.

CTSS3 /

CSN2

TXS3

MOSI2

RXS3

MISO2

RTSS3

SCK2

LCTS1 / T3.1 / T16.1 / [OP2_I+ / AD1.11]

LRX1 / T2.3 / SCL2 / SCL4 / DF1.D7 / [CP1_O]

DF1.C2 / T1.3N / T8.3N / T15.2 / SA2.SDA / RTC_RFIN

SDA2 / SDA4 / LTX1 / DF1.C7 / T2.4 / [CP2.O]

SA2.MCKA / SDA2 / RTSS3 / DF1.D2 / T1.2N / T8.2N / T15.1

SCL2 / CTSS3 / LCTS1 / DF1.C1 / T1.1N / T15.1N / TXC2 / SA2.SCKA

SA2.FSB / RXS2 / RTS4 / T2.1 / T2.E

Table 31. STMod+ GPIO sharing and multiplexing

(1)

(2)

CTSS3 /

Basic SB

CSN2

TXS3

MOSI22021

RXS3

MISO21617

RTSS3

SCK21819

(3)

Port Pins Port SB Basic Some other Alternate Functions

- PA6 1

PB10

PB15

PB11

PB14

PA15

PB13

11 PC6 - INT SA2.MCKA / DF1.C3 / T3.1 / T8.1 INT - D0 -

2 12 PI7 - RST T8.3 RST - D7 -

3 13 PA4 - ADC LT2.O / [AD1.9 / DAC1.1] - D7 HSYNC -

4 14 PA5 - PWM SCK1 / T2.1 / T8.1N / [AD1.10 / DAC1.2] - A5 - -

-

Shared or exclusive functions

(2)

NSS2 / SA2.FSA / SMBA2 / CKS3 / LRTS1 / RXC2 /

DF1.D1

PMOD ARD CAM

- - - DF1.D1

2. RTSS3 stands for USART3_RTS

AD1.3 stands for ADC_1_IN3
T1.3N stands for TIM_1_CH3N
DAC1.1 stands for DAC_1_OUT1
MOSI2 stands for SPI2_MOSI
RST stands for RESET
INT stands for INTERRUPT
DF1.C3 stands for DFSM1_CKIN3
SDA3 stands for I2C3_SDA
LTX1 stands for LP_UART1TX
LT2.O stands for LPTIM2_OUT
NSS2 stands for SPI2_NSS
RXC1 stands for CAN_1_RX
SA2.SCKA stands for SAI2_SCLK_A

3. The solder bridges (SB) are available on PCB to select chosen Port, but they are not used by default: Instead of SB, an embedded SPDT quad switch is used to select Port. It is controlled by 2
GPIOs from the MFX_V3 Expander (STMOD+_SEL_0 and _1), please see Table 32 description below (Bold text is default configuration to support MikroBUS modules using MB1280 fan-out board)

Dig
Mic

UM2271 STMod+ GPIO sharing and multiplexing

Table 32. SPDT quad switch

SPI UART / SPI UART

STMOD+_SEL_0 0 1 1 STMOD+_SEL_0 is GPIO6 of MFX_V3

STMOD+_SEL_1 0 0 1 STMOD+_SEL_1 is GPIO7 of MFX_V3

pin 1 CSN2 CSN2 CTS3 pin 1 is connected directly to PA6

pin 2 MOSI2 TXS3 TXS3

pin 3 MISO2 RXS3 RXS3

pin 4 SCK2 SCK2 RTSS3

DocID030906 Rev 2 53/78

77

Schematics UM2271

Appendix D Schematics

This section provides design schematics for the 32L4R9IDISCOVERY board and design
schematics of the round DSI display and Fanout boards:

Appendix D contains the schematics diagrams listed below:

• Figure 20: 32L4R9IDISCOVERY board interconnections (MB1311C)

• Figure 21: 32L4R9IDISCOVERY power

• Figure 22: 32L4R9IDISCOVERY Arduino Uno V3 connectors

• Figure 23: 32L4R9IDISCOVERY ST-LINK/V2-1

• Figure 24: 32L4R9IDISCOVERY Octo-SPI Flash memory

• Figure 25: 32L4R9IDISCOVERY peripherals

• Figure 26: 32L4R9IDISCOVERY USB OTG FS

• Figure 27: 32L4R9IDISCOVERY Round DSI display interface

• Figure 28: 32L4R9IDISCOVERY IDD measurement and Multi Function eXpander

• Figure 29: 32L4R9IDISCOVERY microcontroller

• Figure 30: 32L4R9IDISCOVERY PSRAM

• Figure 31: 32L4R9IDISCOVERY camera

• Figure 32: 32L4R9IDISCOVERY STMOD+ interface

• Figure 33: 32L4R9IDISCOVERY Audio and DFSDM

• Figure 34: Round DSI display board (MB1314)

• Figure 35: Fanout board (MB1280)

54/78 DocID030906 Rev 2

Figure 20. 32L4R9IDISCOVERY board interconnections (MB1311C)

114

MB1311-TOP

MB1311 C

28/08/2017

Title:

Size: Reference:

Date: Sheet: of

A3

Revision:

STM32L4R9I-DISCOProject:

NRST

ARD_A0
ARD_A1
ARD_A2
ARD_A3
ARD_A4
ARD_A5

ARD_D5

ARD_D4

ARD_D3

ARD_D2

ARD_D1

ARD_D0

ARD_D13

ARD_D12

ARD_D11

ARD_D10

ARD_D9

ARD_D8

ARD_D6
ARD_D7

ARD_D15

ARD_D14

Arduino_ Connectors

Arduino_ Connectors.SchDoc

DCMI_D[0..7]

DCMI_NRSTDCMI_PWR_EN

DCMI_VSYNC

DCMI_HSYNC

DCMI_PIXCK

DCMI_I2C

DCMI_CLK

Camera Interface

Camera.SchDoc

MFX_IRQ_OUT

MFX_WAKEUP

NRST

MFX_I2C

USB_OTGFS_PPWR_EN

DCMI_PWR_EN

uSD_Detect

USB_OVER

DSI_RESET

LED_ORANGE

DSI_TOUCH_INT

AUDIO_RST

EXT_RESET

DSI_PWR_ON

JOYSTICK

STMOD+_SEL_0
STMOD+_SEL_1

IDD

IDD_measurement.SchDoc

LCD_I2C

DSI_RESET

DSI_TOUCH_INT

DSI_USART

DSI_SPI

DSI_BL_CTRL

DSI_PWR_ON

DSI_SWIRE

DSI_TE

DSI_LANES

DSI_LCD

LCD.SchDoc

OCTOSPI Flash

PSRAM

SD

USB_OTG

MFX_IRQ_OUT

MFX_WAKEUP

ARD_A0

MFX_I2C

ARD_A1
ARD_A2
ARD_A3
ARD_A4
ARD_A5
ARD_D0
ARD_D1
ARD_D2
ARD_D3
ARD_D4
ARD_D5
ARD_D6
ARD_D7
ARD_D8

ARD_D9
ARD_D10
ARD_D11
ARD_D12
ARD_D13
ARD_D14
ARD_D15

USART_TX
USART_RX

SWCLK
SWDIO
SWO

DCMI_D[0..7]

DCMI_VSYNC

DCMI_HSYNC

DCMI_PIXCK

STMOD+_UART

STMOD+_I2C

STMOD+_INT

STMOD+_RESET

STMOD+_ADC

STMOD+_PWM

STMOD+_MOSIs
STMOD+_MISOs

STMOD+_SPI

DFDATIN3
DFDATIN1

DFSDM

MIC_VDD

CODEC

LED_GREEN

RESET

DCMI_CLK

DF_CKOUT

DSI_USART
DSI_SPI

JOY_SEL

DSI_TE

DSI_LANES

DSI_BL_CTRL
DSI_SWIRE

HSE_STLINK

MCU

MCU.SchDoc

LED_GREEN

SD

JOYSTICK

LED_ORANGE

uSD_Detect

RESET

JOY_SEL

EXT_RESET

EXT_I2C

Peripherals

Peripherals.SchDoc

U5V

Power

Power.SchDoc

PSRAM

PSRAM

PSRAM.SchDoc

OCTOSPI Flash
NRST

OCTOSPI

OCTOSPI.SchDoc

NRST

SWCLK

SWDIO

SWO

USART_TX
USART_RX

U5V

MCO_STLINK

ST_LINK

ST_LINK_V2-1_2.SCHDOC

USB_OTG

USB_OTGFS_PPWR_EN

USB_OVER

U5V

OTG

USB_OTG_FS.SchDoc

NRST

NRST

STMOD+_INT
STMOD+_RESET
STMOD+_ADC

DFDATIN3

STMOD+_PWM

DFDATIN1

STMOD+_UART
STMOD+_SPI
STMOD+_I2C
STMOD+_MOSIs
STMOD+_MISOs

DF_CKOUT

STMOD+_SEL_1

STMOD+_SEL_0

STMOD+

STMOD+.SchDoc

CODEC

CODEC_I2C

DFSDM

MIC_VDD

AUDIO_RST

Audio

Audio.SchDoc

NRST

STMOD+_SEL_0
STMOD+_SEL_1

STMOD+_SEL_0
STMOD+_SEL_1

UM2271 Schematics

DocID030906 Rev 2 55/78

56/78 DocID030906 Rev 2

Figure 21. 32L4R9IDISCOVERY power

Schematics UM2271

U5V_ST_LINK

5V_USB_CHARGER

ARDUINO power pin

E5V

ARD_5V

VIN

+5V

+5V

U5V

2

JP5

C39
10uF

C42

4.7uF

C33

4.7uF

1 2
3 4
5 6
7 8

SW

SW

+5V

12

L5

2.2uH

L4

2.2uH

D1
ESDA7P60-1U1M

C36
10uF

C38
10uF

C30
10uF

109

2
4

Tab

A1
C2

B2

A1
C2

B2

JP4

3

1

+5V

A2
B1

C1
D1
D2

A2
B1

C1
D1
D2

1

U14

VIN
EN

VSEL1
VSEL2
VSEL3

TPS62743

U9

VIN
EN

VSEL1
VSEL2
VSEL3

TPS62743

U15
LD1117S50TR

Header M Straight 5x2H

Vin3Vout
GND

VOS

GND

VOS

GND

R37

JP9

LD8

820

E5V

+3V3

+1V8

Green

1 2

PWR

VDD

1

2

3

JP7

Power

Title:

STM32L4R9I-DISCOProject:

Size: Reference:

A4

28/08/2017

Date: Sheet: of

MB1311 C

Revision:

214

DocID030906 Rev 2 57/78

Figure 22. 32L4R9IDISCOVERY Arduino Uno V3 connectors

WARNING: Some Arduino IOs are shared with other functions:

Following ARD sign als are multiplexed or shared with other functions. In case ARDUINO
UNO is connected, take care that the corresponding features are disconnected or well
configured :

ARD_D7 : DCMI_HSYN C/DE (Camera conflict)
ARD_A5 : STMOD+_PWM (STMod+ / PMOD conflict)
ARD_D15 : I2C3_SCL (shared with STMod+)
ARD_D14 : I2C3_SDA (shared with STMod+)
ARD_D13 : DSI_SPI2_SCK (SPI2_SCK shared wit h STMod+/PMOD and DSI option)
ARD_D12 : DSI_SPI_D/CX (SPI2_MISO shared wi th STMod+/PMOD and DSI option)
ARD_D11 : DSI_SPI2_MOSI (SPI2_MOSI shared w ith STMod+/PMOD and DSI option)

ADC1_IN5

I2C3_SDA

ADC1_IN10

I2C3_SCL

+3V3

ARD_5V

NRST

NRST

WARNING: voltage applied to VIN <11.5V
WARNING: CN16-PIN4 is not a inpu t PWR

ARD_A4

PG8

ARD_A5

PG7

ADC1_IN12
ADC1_IN13
ADC1_IN4
ADC1_IN15

PA0

PG8

PA5

PG7

ARD_A0
ARD_A1
ARD_A2
ARD_A3

SB33

SB32

SB35

SB34

+3V3

R2
510

PA7
PC4
PC3
PB0

VIN

VDD

1 2 Green

R109 1K

CN16

1
2
3

NRST

4

3V3

5

5V

6

GND

7

GND

8

VIN

SSW-108-22-X-S-VS
CN17

A0

1
2

A1

3

A2

4

A3

5

A4

6

A5

SSW-106-22-X-S-VS

Arduino uno connector

LD3

T1

R6

BSN20

1M

SB2

1

G

SD

2 3

E5V

POWER

AIN

SCL/D15
SDA/D14

AVDD

GND

SCK/D13

MISO/D12

PWM/MOSI/D11

PWM/CS/D10

PWM/D9

D8

D7
PWM/D6
PWM/D5

D4
PWM/D3

D2

TX/D1
RX/D0

CN10

PG7

10

PG8

9
8
7

PB13

6

PB14

5

PB15

4

PI0

3

PH13

2

PH15

1

SSW-110-22-X-S-VS
CN11

PA4

8

PB4

7

PA1

6

PG6

5

PF10

4

PG11

3

PC1

2

PC0

1

SSW-108-22-X-S-VS

ARD_D15

ARD_D14

ARD_D13
ARD_D12
ARD_D11
ARD_D10

ARD_D9
ARD_D8

ARD_D7
ARD_D6
ARD_D5
ARD_D4
ARD_D3
ARD_D2
ARD_D1
ARD_D0

I2C3_SCL

I2C3_SDA

VREF+

SB27

C48
[N/A]

SPI2_SCKIOREF
SPI2_MISO
TIM3_CH2, SPI2_MOSI
TIM5_CH4, SPI2_NSS
TIM8_CH1N

TIM3_CH1
TIM5_CH2

TIM15_CH2

LPUART1_TX
LPUART1_RX

UM2271 Schematics

Arduino Uno connector

Title:

STM32L4R9I-DISCOProject:

Size: Reference:

A4

28/08/2017

Date: Sheet: of

MB1311 C

Revision:

314

58/78 DocID030906 Rev 2

414

ST-LINK/V2-1

MB1311 C

28/08/2017

Title:

Size: Reference:

Date: Sheet: of

A3

Revision:

STM32L4R9I-DISCOProject:

STM_RST

T_JTCK

T_JTCK

T_JTDO

T_JTDI

T_JTMS

OSC_IN
OSC_OUT

T_NRST

AIN_1

USB ST-LINK

COM

Board Ident: PC13=0

T_SWDIO_IN

LED_STLINK
MCO

STLINK_RX

STLINK_TX

T_SWO

USB_RENUMn

USB_RENUMn

+3V3_ST_LINK

+3V3_ST_LINK

PWR_EXT

51

2

GND

3

4

BYPASS

INH

Vin Vout

U31
LD3985M33R

+3V3_ST_LINK

+3V3_ST_LINK

Power Switch to supply +5V
from STLINK USB

PWR_ENn

+3V3_ST_LINK

3

1

2

T12

9013-SOT23

VUSB_ST_LINK

VUSB_ST_LINK

VUSB_ST_LINK

VDD_STL

LED_STLINK

+3V3_ST_LINK

STM_JTMS

STM_JTCK

T_JRST

STL_USB_D_N

STL_USB_D_P

STL_USB_D_N
STL_USB_D_P

5V_STL

VUSB_ST_LINK U5V_ST_LINK

D7

BAT60JFILM

+3V3_ST_LINK

VBAT

1

PC13

2

PC14

3

PC15

4

OSC_IN

5

OSC_OUT

6

/RST

7

VSSA

8

VDDA

9

PA0

10

PA1

11

U2_TX

12

U2_RX13U2_CK14S1_CK15S1_MISO16S1_MOSI17PB018PB119PB2/BOOT120PB1021VSS_123VDD_1

24

PB12

25

PB11

22

S2_CK

26

S2_MISO

27

S2_MOSI

28

PA8

29

PA9

30

PA10

31

PA11

32

PA12

33

JTMS

34

VSS_2

35

VDD_2

36

JTCK

37

JTDI

38

JTDO

39

JNRST

40

PB541PB642PB7

43

BOOT0

44

PB845PB9

46

VSS_3

47

VDD_3

48

U30
STM32F103CBT6

output current limitation : 625mA

+3V3_ST_LINK

USB Virtual ComPort

SWD t o MCU

TCK/SWCLK

TMS/SWDIO

NRST

SWCLK

PA14

SWDIO

PA13

SWO

PB3

Red

_Green

21

34

LD4
HSMF-A201-A00J1

T_JTDO

T_JTMS

VccA

1

A1

2

A2

3

GND4DIR

5

B2

6

B1

7

VccB

8

U10

SN74LVC2T45DCUT

VDD_STL

T_SWO

+3V3_ST_LINK

+3V3_ST_LINK

SWO_MCU

VCCA

1

A1

2

A2

3

GND4DIR

5

B2

6

B1

7

VCCB

8

U8

SN74LVC2T45DCUT

VDD_STL

VDD_STL

+3V3_ST_LINK

USART_TX

USART_RX

PA2

PA3

1 2

X3

NX3225GD-8.00M

transistor pins numbers follow
SOT23 JEDEC standard,

VBUS

1

DM

2

DP

3

ID

4

GND

5

Shield

6

USB_Micro-B receptacle

Shield

7

Shield

8

Shield

9

EXP

10

EXP

11

CN13

1050170001

STLINK power supply

IN

1

IN

2

ON3GND

4

SET

5

OUT

6

OUT

7

FAULT

8

U11
ST890CDR

T_JTCK

T_NRST

+5V
VDD

5V_STL

VDD_STL

1

1

2

2

3

3

445

5

6

6

7

7

8

8

SW1
EDG-501S

SWD

12345

6

CN5
313106S111116

Only footprint with Cable:TC2050-IDC-NL

PA13

PA14

PB3

VDD

TAG

+3V3_ST_LINK

123

4

CN15
[N/A]

STM_JTMSSTM_JTCK

SWCLK SWDIO

Not Fitted, must be on a border or the PCB.

VUSB_ST_LINK 5V_USB_CHARGER

1

2

3

JP10

1

2

3

4

5 6

7

8

9

10

CN8
Tag-10_C

100nF

C37

100nF

C29

100nF

C31

100nF

C40

R103 [N/A]

2K7

R104

4K7

R105

100K

R106

10K

R101

10pF

C98

10pF

C93

100nF

C92

4K7R92

4K7R93

0R88

100K

R25

100nF

C19

100nF

C22

0

R20

100K

R19

100K

R18

100KR86

[N/A]

1K5R98

10K

R34

36K

R36

100R35

100 R94

100 R28

100 R30

100 R32

100R110

100R26

100

R111

100

R115

R33 820

10KR29

100nF

C35

1uF

C41

0

R22

100

R21

100

R23

1uF

C95

100nF

C94

100nF

C34

100nF

C32

1uF

C96

100nF

C97

10nF

C91

1 2

Fault

Red

LD5

SB36

SB14

0R24

0R31

D4 BAT60JFILM

D5 [N/A]

D6 [N/A]

E5V

U5V

R102
[N/A]

R91 [N/A]

I/O1

1

GND

2

I/O23I/O2

4

Vbus

5

I/O1

6

U28

USBLC6-2SC6

i

Diff Pair 90ohm

i

Diff Pair 90ohm

100nF

C79

VUSB_ST_LINK

JP8
[N/A]

1

324

5

U12
ESDALC6V1W5

2K2

R27

MCO_STLINK

MCO

To HSE input OSC_IN_PH0

1

324

5

U32
ESDALC6V1W5

ST890DTR

IN

1

IN

2

ON3GND

4

SET

5

OUT

6

OUT

7

FAULT

8

E-PAD

9

U33

[N/A]

Power Switch ST890 will be populated:

- either by U11 ST890CDR in SO8 package

- either by U33 ST890DTR in DFN8L package

VUSB_ST_LINK

PWR_ENn

U11_8

U11_8

U5V_ST_LINK

U11_5

U11_5

Figure 23. 32L4R9IDISCOVERY ST-LINK/V2-1

Schematics UM2271

Figure 24. 32L4R9IDISCOVERY Octo-SPI Flash memory

D

Q

V

C

QCQ

0

V

Q

/

W

#

L

CS

/

OIO

0

Macronix MX25LM51245GXDI00 used by default (functional at 3V3 only)

ECS feature can be monitored on Macronix by soldering SB25

RESET pins of Flash have internal pull-up (both) by default

Double footprint to be compatible with Micron P/N

VPP connection is accessible on Micron

UM2271 Schematics

DocID030906 Rev 2 59/78

Impedance Constraint [Min = 40 Max = 60 ]
Matched Net Lengths [ Tolerance = 200 mil ]

i

OCTOSPI_IO

OCTOSPI_CS

OCTOSPI_CLK

OCTOSPI_DQS

OCTOSPI_IO0
OCTOSPI_IO1
OCTOSPI_IO2
OCTOSPI_IO3
OCTOSPI_IO4
OCTOSPI_IO5
OCTOSPI_IO6
OCTOSPI_IO7

OCTOSPI_RESET

i

OCTOSPI_IO

OCTOSPI_IO

U23

C2

S#

#

B2

C

C3

DQS

D3

DQ0

D2

DQ1

C4

DQ2/W#

D4

DQ3

D5

DQ4

E3

DQ5

E2

DQ6

E1

DQ7

A4

RESET#

MT35XL512ABA1G12-0SIT

Micron

i

OCTOSPI_IO

[N/A]

OCTOSPI_IO

i

i

OCTOSPI_IO

B4

VCC

C

D1

VCC

E4

VCC

C5

VPP

B3

VSS

C1

VSS

E5

VSS

A5

DNU

B5

DNU

A2

RFU

A3

RFU

B1

RFU

OCTOSPI_IO

OCTOSPI_IO

i

i

i

OCTOSPI_IO

OCTOSPI_IO

VDD_OCTOSPIFLASH

VPP_OCTOSPIFLASH

A5

i

i

OCTOSPI_IO

OCTOSPI_DQS
OCTOSPI_CLK

OCTOSPI_IO0
OCTOSPI_IO1
OCTOSPI_IO2
OCTOSPI_IO3
OCTOSPI_IO4
OCTOSPI_IO5
OCTOSPI_IO6
OCTOSPI_IO7

i

SB26

NRST

NRST

SB24

OCTOSPIM_P2_CS

33R51OCTOSPI_CS
33R52

OCTOSPIM_P2_DQS

33R73

OCTOSPIM_P2_CLK

33R68

OCTOSPIM_P2_IO0

33R71

OCTOSPIM_P2_IO1

33R53

OCTOSPIM_P2_IO2

33R78

OCTOSPIM_P2_IO3

33R67

OCTOSPIM_P2_IO4

33R72

OCTOSPIM_P2_IO5

33R69

OCTOSPIM_P2_IO6

33R63

OCTOSPIM_P2_IO7

OCTOSPI_CS

OCTOSPI_CLK

OCTOSPI_DQS

OCTOSPI_IO0
OCTOSPI_IO1
OCTOSPI_IO2
OCTOSPI_IO3
OCTOSPI_IO4
OCTOSPI_IO5
OCTOSPI_IO6
OCTOSPI_IO7

OCTOSPI_RESET

R48
10K

C2

B2

C3

D3
D2
C4
D4
D5
E3
E2
E1

OCTOSPI

PG12
PG15
PI6

PI11
PI10
PI9
PH8
PH9
PH10
PG9
PG10

U24

CS

SCLK

C

DQS

SI/SIO0

I/
SO/SIO1
SIO2
SIO3

IO
SIO4
SIO5
SIO6
SIO7

RESETA4NC

MX25LM51245GXDI00

IO

I

OCTOSPIM_P2_CS
OCTOSPIM_P2_DQS
OCTOSPIM_P2_CLK

OCTOSPIM_P2_IO0
OCTOSPIM_P2_IO1
OCTOSPIM_P2_IO2
OCTOSPIM_P2_IO3
OCTOSPIM_P2_IO4
OCTOSPIM_P2_IO5
OCTOSPIM_P2_IO6
OCTOSPIM_P2_IO7

VCC
VCCQ
VCCQ

GND

VSSQ
VSSQ

ECS

NC
NC
NC
NC

Macronix

VDD_OCTOSPIFLASH

B4
D1
E4

B3
C1
E5

A5

A5

A2
A3
B1
B5

VPP_OCTOSPIFLASH

C5

SB25

R47
10K

OCTOSPI Flash

VDDVDD_OCTOSPIFLASH

C65
100nF

Close to Flash

SB23

C66
100nF

C49
100nF

OCTOSPI Flash

Title:

STM32L4R9I-DISCOProject:

Size: Reference:

A4

28/08/2017

Date: Sheet: of

MB1311 C

Revision:

514

60/78 DocID030906 Rev 2

Figure 25. 32L4R9IDISCOVERY peripherals

Schematics UM2271

U4

IO1

GND3IO2

ESDA6V1L

GND

Reset Button

MICRO SD
(TF) Card

SD

SD

uSD_CMD

uSD_CLK

uSD_D2
uSD_D3

uSD_D0
uSD_D1

3

41

1

2

PC13 - WKUP2

uSD_Detect

uSD_D2
uSD_D3
uSD_CMD
uSD_CLK
uSD_D0
uSD_D1

B1

TD-0341X-A00 [RESET/Black]

2

GND

JOY_SEL

uSD_Detect

MFX_GPIO5

PC10
PC11
PD2
PC12
PC8
PC9

micro SD is functional with 3V3 only

RESET

uSD_Detect

U13

1

WP/CD

2

RDAT3_GND

3

DAT2_IN

4

DAT3_IN

5

CMD_IN

6

CLK_IN

7

DAT0_IN
DAT1_IN8DAT1_EX

17

GND

EMIF06-MSD02N16

MFX_GPIO5

RDATA_VCC

VCC
DAT2_EX
DAT3_EX

CMD_EX

CLK_EX

DAT0_EX

+3V3

SB37

I2C

SCL

SDA

R112 0

MFX_GPIO11

+5V

EXT_I2C

EXT_RESET

LD2

LD1

The 2 LEDs are top side

1 2Green

1 2Orange

R5
510

R3
680

PH4

MFX_GPIO0

LED_GREEN

LED_ORANGE

I2C1_SCL

R108 0I2C1_SDA
R107 0

VDD

PG13
PB6

I2C1_SCL

I2C1_SDA

CN7

1 2
3 4
5 6
7 8

F206A-2*04MGF-A

SSM-104-L-DH (Samtec)

EXT_I2C ConnectorUser LEDs

JOYSTICK

VDD

B2

16
15
14

SD_D2
SD_D3

13

SD_CMD

12
11

SD_CLK

10

SD_D0

9

SD_D1

9

4

2

5

3

7

DAT18DAT0

CARD_DETECT

10

GND

1

6

VSS

CLK

VDD

CMD

DAT2

DAT3_CD

13

NC

MT008-A

COMMON

Selection

DOWN

LEFT

RIGHT

5

2

3
1
6
4

UP

1

100R42

JOY_SEL

324

VDD

PC13 - WKUP2

MFX_GPIO2
MFX_GPIO4
MFX_GPIO3
MFX_GPIO1

5

U17
ESDALC6V1W5

JOY_SEL is also the WAKE_UP function

JOY_SEL

JOYSTICK

JOY_DOWN
JOY_LEFT
JOY_RIGHT
JOY_UP

JOYSTICK

11

GND

CN6
MR01A-01211

GND

12

Peripherals

Title:

STM32L4R9I-DISCOProject:

Size: Reference:

A4

28/08/2017

Date: Sheet: of

MB1311 C

Revision:

614

Figure 26. 32L4R9IDISCOVERY USB OTG FS

UM2271 Schematics

DocID030906 Rev 2 61/78

USB_OTGFS_PPWR_EN

USB_OTG

USB_OTG

MFX_GPIO13

VBUS

DM

DP

ID

USB_OTGFS_VBUS
USB_OTGFS_DM
USB_OTGFS_DP
USB_OTGFS_ID

+5V

R40
47K

+5V

0R41

PA9
PA11
PA12
PA10

iDi ff Pair 90 ohm iDiff Pair 90 ohm

1
2

SB15

U18

I/O1

I/O4

GND

VBUS

I/O23I/O3

USBLC6-4SC6

U16

2
5
4

STMPS2141STR

6
5
4

GND

FAULT

IN

OUT

EN

12

D2
ESDA7P60-1U1M

Place Diode close to the pin 5 / 6 of
USBLC6-4SC6
Diode added, for USB Cable detach
workaround

MFX_GPIO14

+3V3

R38
620

R39
47K

12

LD7
Red

3
1

C43

4.7uF

USB_OTGFS_OVRCR

D_N

D_POpen drain

R113
47K

1
2
3
4
5

6
7
8
9

10

CN9

VBUS
DM
DP
ID
GND

Shield
Shield
Shield
Shield
EXP

475900001

1

R114
10K

USB_OVER

U5V

USB_Micro-AB receptacle

+3V3

R43
330

12

LD6
Green

3

T13
9013-SOT23

2

transistor pins numbers follo w
SOT23 JEDEC standard,

VBUS OK

USB Full Speed operating range voltage: 3.0V<VDDUSB<3.6V

USB_OTG_FS

Title:

STM32L4R9I-DISCOProject:

Size: Reference:

A4

28/08/2017

Date: Sheet: of

MB1311 C

Revision:

714

62/78 DocID030906 Rev 2

814

LCD Interface

MB1311 C

28/08/2017

Title:

Size: Reference:

Date: Sheet: of

A3

Revision:

STM32L4R9I-DISCOProject:

+5V

L2 FCM1608KF-601T03

L1 FCM1608KF-601T03

SDA
SCL

I2C

LCD_I2C

I2C1_SDA

VDD

VDD_LCD

DSI_PWR_ON 3

4

5

G

SD

6

2

1

T5
STT7P2UH7

100nF

C60

100K

R50

100nF

C5

10uF

C4

SB12

SB11

SB9

100nF

C53

PB1

DSI_TOUCH_INT

To MFX

MFX_GPIO9

DSI LCD

TOUCH_INT

LCD_BL_CTRL

DSI_BL_CTRL

DSI_TE

PG13

PB6

PF11

DSI_RESET

112

2

334

4

556

6

778

8

9910

10

111112

12

131314

14

151516

16

171718

18

191920

20

212122

22

232324

24

252526

26

272728

28

292930

30

313132

32

333334

34

353536

36

373738

38

393940

40

414142

42

434344

44

454546

46

474748

48

494950

50

515152

52

535354

54

555556

56

575758

58

595960

60

61

61

62

62

63

63

64

64

CN4

QSH-030-01-F-D-A-K-TR

I2C1_SCL

I2C1_SDA

DSI_D2_P
DSI_D2_N

DSI_D3_P
DSI_D3_N

1V8_LCD

SB10

10K

R7

DSI_SWIRE

DSI_PWR_ON

VDD_LCD

DSI_SPI2_CLK
DSI_SPI2_MOSI
DSI_SPI_D/CX

DSI_USART_CK

DSI_USART_TX

DSI_USART

DSI_SPI_CS

DSI_SPI_MOSI

DSI_SPI_CK

DSI_SPI_DCX

DSI_SPI

DSI_USART

DSI_SPI

USART3_CK

USART3_TX

SB6

SB8

DSI_CK_P
DSI_CK_N

DSI_D0_P
DSI_D0_N

DSI_D1_P
DSI_D1_N

DSI_LANES

DSI_CK_P
DSI_CK_N

DSI_D0_P
DSI_D0_N

DSI_D1_N

DSI_D1_P

DSI_LANES

BLGND

3V3_LCD

3

4

5

G

SD

6

2

1

T4
STT7P2UH7

1V8_LCD

3

4

5

G

SD

6

2

1

T6
STT7P2UH7

+3V3

+5V

+1V8

100nF

C52

3V3_LCD

I2C1_SCL

DSI_SPI_USART_CS

DSI_SPI_D/CX

SPI2_MOSI

SPI2_CLK

In case SB7 is connected, pay attention that
DSI_USART_CK is also connected to the ARD_A3
function linked to ARDUINO Sheet

SB7

SB13

MFX_GPIO10

DSI_SPI_USART_CS

PB14

PB15

PH14
PB13

PB10
PB0

PA8

In case SB13 is connected, pay attention that
DSI_USART_TX may also be used by the
STMod+/PMOD function of page 13 as USART3_TX

(g

)

SB13 is exclusive with SB6

SB7 is exclusive with SB8

All DSI pairs are Differential 100 ohm

0

R118

0

R119

0

R120

C100

[N/A]

C101

[N/A]

C99

[N/A]

Figure 27. 32L4R9IDISCOVERY Round DSI display interface

oing to PMOD#2 signal

Schematics UM2271

Figure 28. 32L4R9IDISCOVERY IDD measurement and Multi Function eXpander

914

IDD measurement / MFX (Multi Function eXpander)

MB1311 C

28/08/2017

Title:

Size: Reference:

Date: Sheet: of

A3

Revision:

STM32L4R9I-DISCOProject:

VDD_MCU

Current
direction

to MCU

differential
amplifier

SH0 SH1 SH2

Shunts

3

4

5

G

SD

6

2

1

T2
STT7P2UH7

3

4

5

G

SD

6

2

1

T8
STT7P2UH7

3

4

5

G

SD

6

2

1

T10
STT7P2UH7

3

4

5

G

SD

621

T7
STT7P2UH7

decoupling capacitors
close to TSZ122

MFX_IRQ_OUT

IDD_MEAS

MFX_SWCLK

CAL

SH2

SH1

MFX_SWDIO

IDD_MEAS

SH1_D SH2_DSH0_D

CAL_D

VDD1 one capacitor close to each MFX pins:

SH0

VDD_MCU

MFX_WAKEUP

L6
FCM1608KF-601T03

123

JP1

bypass

R55
1_1%_0805

R81
24_1%_0805

R85
620_1%_0805

R62
10K_1%_0805

V+

V-

3

2

1

4 8

U27A
TSZ122IST

5

6

7

U27B
TSZ122IST

V+

V-

3

2

1

4 8

U25A
TSZ122IST

5

6

7

U25B
TSZ122IST

decoupling capacitors
close to TSZ122

MFX_I2C1_SCL
MFX_I2C1_SDA

MFX_WAKEUP

MFX_IRQ_OUT

NRST

NRST

MFX_I2C1_SCL

MFX_I2C1_SDA

VDD1

VDD1

D3 BAT60JFILM

SDA

SCL

I2C

MFX_I2C

VDD

VDD

3

4

5

G

SD

621

T3
STT7P2UH7

VDD

+5V

+5V

PI1

PB2

PG13

PB6

MFX_aGPIO1

CAL

MFX_aGPIO1

MFX_aGPIO1

T50_4 T50_6

AMP_VDD

AMP_5V

123

4

CN14
[N/A]

MFX_SWCLK MFX_SWDIO

VDD1

3

4

5

G

SD

6

2
1

T9
STT7P2UH7

3

4

5

G

SD

6

2
1

T11
STT7P2UH7

100nF

C84

100nF

C88

100nF

C83

100nF

C89

100nF

C90

100K

R87

10KR96

510R95

0

R79

100K

R74

100K

R49

100K

R84

100K

R89

100K

R90

100nF

C69

100nF

C64

100nF

C73

100nF

C78

1uF

C67

100

R75

357K

R77

11K

R70

6K04R60

6K04R65 300KR66

300KR76

Default I2C Address:1000010

MFX_V3

WAKEUP

2

NRST

7

TSC_XP/GPO0

10

TSC_XN/GPO1

11

TSC_YP/GPO2

12

TSC_YN/GPO3

13

USART_TX

21

USART_RX

22

SPARE

14

SWDIO

34

SWCLK

37

I2C_SCL

42

I2C_SDA

43

BOOT0

44

I2C_ADDR

45

IRQOUT

46

IDD_CAL/GPO4

3

IDD_SH0

4

IDD_SH1/GPO5

5

IDD_SH2/GPO6

6

IDD_MEAS

25

GPIO0

18

GPIO1

19

GPIO2

20

GPIO3

39

GPIO4

40

GPIO5

15

GPIO6

16

GPIO7

17

GPIO8

29

GPIO9

30

GPIO10

31

GPIO11

32

GPIO12

33

GPIO13

26

IDD_SH3/GPO7

38

GPIO14

27

GPIO15

28

IDD_VDD_MCU

41

VDD

1

VDDA

9

VDD_124VDD_236VDD_3

48

VSSA8VSS_123VSS_235VSS_3

47

U29

0

R97

VDD1

JP6 [N/A]

SB31

DSI_TOUCH_INT

JOY_UP
JOY_DOWN
JOY_RIGHT
JOY_LEFT

JOYSTICK

JOYSTICK

DSI_RESET

DCMI_PWR_EN

uSD_Detect

USB_OVER

JOY_DOWN
JOY_RIGHT
JOY_LEFT

JOY_UP

LED_ORANGE

USB_OTGFS_PPWR_EN

AUDIO_RST

EXT_RESET

10nF

C86

[N/A]

STMOD+_SEL_0

STMOD+_SEL_1

DSI_1V8_PWRON

DSI_PWR_ON

DSI_1V8_PWRON

DSI_3V3_PWRON

6.8KR117

56KR116 DSI_PWR_ONPA8 (MFX_GPIO8)

PA2 (MFX_aGPIO2)

22uF

C75

VDD, VDD_1, VDD_2, VDD_3

UM2271 Schematics

DocID030906 Rev 2 63/78

64/78 DocID030906 Rev 2

10 14

MCU

MB1311 C

28/08/2017

Title:

Size: Reference:

Date: Sheet: of

A3

Revision:

STM32L4R9I-DISCOProject:

OCTO SPI Flash

OCTOSPIM_P2_IO1

OCTOSPIM_P2_IO0

OCTOSPIM_P2_CLK

OCTOSPIM_P2_CS

OCTOSPIM_P2_IO2
OCTOSPIM_P2_IO3
OCTOSPIM_P2_IO4
OCTOSPIM_P2_IO5
OCTOSPIM_P2_IO6
OCTOSPIM_P2_IO7

OCTOSPIM_P2_DQS

OCTOSPI

OCTOSPIM_P2_IO0
OCTOSPIM_P2_IO1
OCTOSPIM_P2_IO2
OCTOSPIM_P2_IO3

OCTOSPIM_P2_CS
OCTOSPIM_P2_CLK

D[0..15]

PSRAM_A[0..20]

PSRAM

PSRAM_A[0..20]

PSRAM_NE1

PSRAM_NBL0

PSRAM_WE

PSRAM_OE

PSRAM_D[0..15]

PSRAM_NBL1

PSRAM_WAIT

PSRAM_CLK
PSRAM_ADV

PSRAM

PSRAM_NE1
PSRAM_NBL0
PSRAM_NBL1
PSRAM_WE
PSRAM_OE

PSRAM

DSI_USART

DSI_USART_CK
DSI_USART_TX

DSI_USART

DSI_SPI_USART_CS
SPI2_MOSI
SPI2_CLK

DSI LCD

CODEC

SAI_SDB

SAI_FSA

SAI_MCKA

SAI_SDA

SAI_SCKA

SAI

SAI1_SCKA
SAI1_MCKA
SAI1_FSA
SAI1_SDA
SAI1_SDB

DFSDM

DATIN1

CKOUT

DFSDM

DF_CKOUT

CODEC&DFSDM

uSD_D0

uSD_CLK

uSD_D1

uSD_D2

uSD_D3

uSD_CMD

SD

uSD_D0

uSD_D1

uSD_D2

uSD_D3

uSD_CLK
uSD_CMD

SD

SD

JOYSTICK

VBUS

DM

DP
ID

USB_OTG

USB_OTGFS_VBUS
USB_OTGFS_DM
USB_OTGFS_DP
USB_OTGFS_ID

USB_OTG

USB_OTG

MFX

MFX_IRQ_OUT

MFX_WAKEUP

MFX_IRQ_OUT

MFX_WAKEUP

Arduino

ARD_A0

ARD_A0

SDA

SCL

I2C

MFX_I2C

I2C1_SCL
I2C1_SDA

ARD_A1
ARD_A2
ARD_A3
ARD_A4
ARD_A5

ARD_A1
ARD_A2
ARD_A3
ARD_A4
ARD_A5

ARD_D0
ARD_D1
ARD_D2
ARD_D3
ARD_D4
ARD_D5
ARD_D6
ARD_D7
ARD_D8

ARD_D9
ARD_D10
ARD_D11
ARD_D12
ARD_D13
ARD_D14
ARD_D15

ARD_D0
ARD_D1
ARD_D2
ARD_D3
ARD_D4
ARD_D5
ARD_D6
ARD_D7
ARD_D8
ARD_D9
ARD_D10
ARD_D11
ARD_D12
ARD_D13
ARD_D14
ARD_D15

Camera

DCMI_HSYNC

DCMI_VSYNC

DCMI_D[0..7]

DCMI_PIXCLK

NRST

ST_LINK

USART2_TX
USART2_RX

USART_TX
USART_RX

SWCLK

SWDIO

SWO

SWDIO

SWO

SWCLK

X1

NDK NX3215SA-32.768KHZ-EXS00A-MU00525

VDD_MCU

VDDA

L3

FCM1608KF-601T03

DCMI_D[0..7]

DCMI_VSYNC

DCMI_HSYNC

DCMI_PIXCK

STMOD+

STMOD+_SPI

MISO
MOSI

CLK

CS

SPI

SPI2_CLK
SPI2_MISO
SPI2_MOSI
USART3_CTS_SPI2_CS

DFDATIN1

MIC_VDD

OTHER CONTROL

STMOD+_UART

RX

TX

RTS

CTS

UART

USART3_TX
USART3_RX
USART3_RTS

SDA
SCL

I2C

STMOD+_I2CI2C3_SCL

I2C3_SDA

STMOD+_INT

STMOD+_RESET

STMOD+_ADC

DFDATIN3

STMOD+_PWM

DFDATIN1

DFDATIN3

STMOD+_INT
STMOD+_RESET
STMOD+_ADC
STMOD+_PWM

DCMI_D1

DCMI_D2
DCMI_D3

DCMI_D5
DCMI_VSYNC

OCTOSPIM_P2_IO0

DCMI_PIXCLK

I2C1_SCL

JOY_SEL

DCMI_D0

PSRAM_WE

PSRAM_OE

D0
D1

D2
D3

D13
D14
D15

DSI_SPI_DCX

PSRAM_A0
PSRAM_A1
PSRAM_A2
PSRAM_A3
PSRAM_A4
PSRAM_A5

PSRAM_A6
PSRAM_A7
PSRAM_A8
PSRAM_A9

PSRAM_A16
PSRAM_A17
PSRAM_A18

USART2_RX

uSD_D0
uSD_D1
uSD_D2
uSD_D3
uSD_CLK

uSD_CMD

SPI2_CLK
SPI2_MISO

DFDATIN3

DFDATIN1

STMOD+_MOSIs
STMOD+_MISOs

SPI2_MISOs

SPI2_MOSIs

SPI2_MOSIs

ARD_A0

ARD_A1

ARD_A2

ARD_A5

ARD_D3

ARD_D4

ARD_D8

ARD_D9

3

2

1

JP3

+3V3

VDD_MCU

VDD_MCU

DSI_TE OSC_IN_PH0

OSC_OUT_PH1

LED_GREEN

LED_GREEN

VDD_MCU

RESET

NRST

DCMI_CLK

DCMI_CLK

STMOD+_INT

VREF+

VDD

USART3_CK

DF_CKOUT

DF_CKOUT

VDD

100nF

C28

100nF

C21

100nF

C26

100nF

C27

100nF

C17

100nF

C20

100nF

C23

100nF

C72

100nF

C61

100nF

C12

100nF

C18

100nF

C7

100nF

C15

100nF

C85

1K5

R100

1K5

R99

0R61

R14 [N/A]

5.6pF

C11

DF_CKOUT

100nF

C10

1uF

C13

R16 [N/A]

100K

R15

5.6pF

C9

PSRAM_CLK
PSRAM_ADV

PSRAM_WAIT

OCTOSPIM_P2_IO4
OCTOSPIM_P2_IO5
OCTOSPIM_P2_IO6
OCTOSPIM_P2_IO7

OCTOSPIM_P2_DQS

R54 0

R56 0

OSC32_IN

OSC32_OUT

SAI1_SCKA

I2C1_SDA

USART3_TX

DSI_TE

USART2_TX

SWDIO

SWO

SWCLK

USB_OTGFS_VBUS

USB_OTGFS_DM
USB_OTGFS_DP

USB_OTGFS_ID

SPI2_MOSI

STMOD+_ADC

DFDATIN1

ARD_A4
ARD_D5

ARD_D10

ARD_D11

ARD_D12

ARD_D13

LED_GREENDCMI_CLK

DCMI_D6

SAI1_MCKA

SAI1_SDA
D4
D5
D6
D7
D8
D9
D10
D11
D12PSRAM_NE1

PSRAM_NBL0
PSRAM_NBL1

PSRAM_A10
PSRAM_A11
PSRAM_A12
PSRAM_A13
PSRAM_A14
PSRAM_A15

ARD_D0
ARD_D1

ARD_D2

ARD_D6

USART3_CTS_SPI2_CS

USART3_CTS_SPI2_CS

USART3_TX

DSI_SPI

DSI_SPI_CS

DSI_SPI_MOSI

DSI_SPI_CK

DSI_SPI_DCX

DSI_SPI

DSI_TE

USART3_RX

OCTOSPIM_P2_IO3

OCTOSPIM_P2_IO5

DSI_CK_P

DSI_D0_P
DSI_D0_N

DSI_D1_P
DSI_D1_N

DSI_CK_N

I2C3_SCL
I2C3_SDA

ARD_D15

OCTOSPIM_P2_IO4

SPI2_MISOs

DCMI_HSYNC

MFX_IRQ_OUT

OCTOSPIM_P2_CLK

USART3_RTS

PSRAM_CLK

PSRAM_WAIT

OCTOSPIM_P2_IO6
OCTOSPIM_P2_IO7

OCTOSPIM_P2_CS

OCTOSPIM_P2_DQS

PSRAM_ADV

BOOT0

ARD_A3USART3_CK
DSI_BL_CTRL
MFX_WAKEUP

MIC_VDD

DSI_SPI_USART_CS

OCTOSPIM_P2_IO1

OCTOSPIM_P2_IO2

JOY_SEL

JOY_SEL

VDD_MCU

100nF

C24

C25

2.2uF

OCTOSPI Flash

DSI_LANES

DSI_CK_P
DSI_CK_N
DSI_D0_P
DSI_D0_N

DSI_D1_N

DSI_D1_P

DSI_LANES

DSI_CK_P

DSI_D0_P
DSI_D0_N
DSI_D1_P
DSI_D1_N

DSI_CK_N

STMOD+_PWM

ARD_D14

SPI2_MISO

DSI_BL_CTRL

DSI_BL_CTRL

MIC_VDD

DCMI_D7SAI1_FSA

PSRAM_A20 DCMI_D4

PSRAM_A19

DSI_SWIRE

DSI_SWIRE

DSI_SWIRE

SAI1_SDB

ARD_D7

STMOD+_RESET

H3

H4 H1

H2

PC13-WKUP

E1

PC0

J2

PC1

J3

PC2

J4

PC3

K1

PA0-WKUP

K3

PA1

M1

PA2-WKUP

N1

PA3

M2

PA4

N2

PA5

L3

PA6

L4

PA7

M4

PC4

K4

PB0

N4

PB1

L5

PB2

N5

PB10

N9

PB11

H7

PB12

N12

PB13

N13

PB14

M12

PB15

L10

PC6

F11

PC7

G11

PC8

F9

PC9

G13

PA8

E11

PA9

E12

PA10

D11

PA11

E13

PA12

D13

PA13

A11

PA14

A10

PA15

A9

PC10

D9

PC11

E9

PC12

F8

PB3

A6

PB4

A5

PB5

B5

PB6

C5

PB7

D5

PB8

C4

PB9

D4

PC14-OSC32_IN

F1

PC15-OSC32_OUT

G1

PH0-OSC_IN

H1

PH1-OSC_OUT

J1

NRST

H3

PH3-BOOT0

E5

PD8

K10

PD9

K9

PD10

J10

PD11

J9

PD12

J8

PD13

H8

PD14

H11

PD15

H10

PD0

B8

PD1

C8

PD2

D8

PD3

E8

PD4

C7

PD5

D7

PD6

E7

PD7

F7

PF0

F5

PF1

F4

PF2

F3

PF3

G3

PF4

G4

PF5

G5

PF10

H4

PF11

M5

PF12

N6

PF13

M6

PF14

L6

PF15

K5

U7A

STM32L4R9AII6U

PE2

D3

PE3

D2

PE4

D1

PE5

E4

PE6-WKUP

E3

PE7

L7

PE8

K6

PE9

J6

PE10

H6

PE11

N8

PE12

M8

PE13

L8

PE14

K7

PE15

J7

PE0

A4

PE1

B4

PG0

J5

PG1

H5

PG2

H9

PG3

G8

PG4

G7

PG5

G9

PG6

G12

PG7

G10

PG8

F10

PG9

B7

PG10

D6

PG11

E6

PG12

F6

PG13

G6

PG15

C6

PI0

A12

PI1

B11

PI2

B10

PI3

C10

PI4

D10

PI5

E10

PI6

B9

PI7

B2

PI9

B1

PI10

A1

PI11

C3

PH2

A2

PH4

K8

PH5

L9

PH8

N10

PH9

C11

PH10

M9

PH11

M10

PH12

B13

PH13

C9

PH14

A13

PH15

B12

DSI_D0_P

L11

DSI_D0_N

L12

DSI_D1_P

J11

DSI_D1_N

J12

DSI_CK_P

K11

DSI_CK_N

K12

U7B

STM32L4R9AII6U

VBAT

E2

VSSA/VREF-

K2

VREF+

L1

VDD_1/9_0/10

N11

VDDA

L2

VDDUSB

D12

VSS_1/IO_2

A7

VDD_8/11

H13

VDD_4

N3

VDD_5

G2

VDD_6/7

N7

VDD_9

A8

VSS_2

C12

VSS_4/6

H2

VSS_5

F2

VSS_3/13

B3

VSS_7

M7

VSS_8/9_0/11

H12

VSS_9

M3

VSSIO_1

F13

VDDIO_1

F12

VDD_2

C13

VDDIO_2

B6

VDD_3/13

A3

VDD_REGDSI

M13

DSI_VSS_0

J13

DSI_VSS_1

K13

DSI_VCAP_0

L13

VSS_10

C2

VSS_12

M11

VDD_12

C1

U7C

STM32L4R9AII6U

4132

X2

NX3225GA-16MHz-EXS00A-CG04815

6.8pF

C51

6.8pF

C50

OSC_IN_PH0

HSE_STLINK

SB28

22uF

C6

22uF

C8

22uF

C87

Figure 29. 32L4R9IDISCOVERY microcontroller

Schematics UM2271

Figure 30. 32L4R9IDISCOVERY PSRAM

UM2271 Schematics

DocID030906 Rev 2 65/78

U5 used U6 used
(Default)

SB3

SB4 X

R8

R9

R10

R12

U6

U5 [N/A]fitted

SB38

SB390R[N/A] 0R

X

0R

[N/A]

10K

10K

10K

[N/A]

Impedance Constraint [Min = 40 Max = 60 ]
Matched Net Lengths [ Tolerance = 200 mil ]

PSRAM_NE1

PD7

+3V3

VDD_LCD

[N/A]

10K

10K

10K[N/A]

fitted

[N/A]

R11 [N/A]

0R13

SB3 and SB4 are only useful for U6 :

PSRAM_A20

iPSRAM_A

PSRAM_A19
PSRAM_A18
PSRAM_A17
PSRAM_A16
PSRAM_A15
PSRAM_A14
PSRAM_A13
PSRAM_A12
PSRAM_A11
PSRAM_A10
PSRAM_A9
PSRAM_A8
PSRAM_A7
PSRAM_A6
PSRAM_A5
PSRAM_A4
PSRAM_A3
PSRAM_A2
PSRAM_A1
PSRAM_A0

i

PSRAM_A

PSRAM_A

PSRAM_A19 PE3
PSRAM_A18
PSRAM_A17
PSRAM_A16
PSRAM_A15
PSRAM_A14
PSRAM_A13
PSRAM_A12
PSRAM_A11
PSRAM_A10
PSRAM_A9
PSRAM_A8
PSRAM_A7
PSRAM_A6
PSRAM_A5
PSRAM_A4
PSRAM_A3
PSRAM_A2
PSRAM_A1
PSRAM_A0

i

PSRAM_A

[N/A]

0R

JP2

R17 0

PSRAM_VDD

Double footprint for Async/Sync PSRAMs compatibility

i

PSRAM_A

PE4
PE3
PD13
PD12
PD11
PG5
PG4
PG3
PG2
PG1
PG0
PF15
PF14
PF13
PF12
PF5
PF4
PF3
PF2
PF1
PF0

PD13
PD12
PD11
PG5
PG4
PG3
PG2
PG1
PG0
PF15
PF14
PF13
PF12
PF5
PF4
PF3
PF2
PF1
PF0

i

If SB3 is fitted, CAMERA and PSRAM functions are exclusives; if SB4 fitted, PSRAM usable memory density is reduced to 16M bits

SB3

i

PSRAM_A

PSRAM_VDD

i

PSRAM_A

10KR10

i

PSRAM_D

10KR9

SB4

PSRAM_CE_CS1
PSRAM_WE

PD5

PSRAM_OE

PD4

PSRAM_NBL0

PE0

PSRAM_NBL1

PE1
PD6

PSRAM_WAIT

PD3

PSRAM_CLK

PB7

PSRAM_ADV

i

PSRAM_A

PSRAM_CE_CS1

PD5

PSRAM_WE

PD4

PSRAM_OE

PE0

PSRAM_NBL0

PE1

PSRAM_NBL1

H6

A20

G2

A19

H1

A18

D3

A17

E4

A16

F4

A15

F3

A14

G4

A13

G3

A12

H5

A11

H4

A10

H3

A9

H2

A8

D4

A7

C4

A6

C3

A5

B4

A4

B3

A3

A5

A2

A4

A1

A3

A0

B5

CE

G5

WE

A2

OE

A1

LB

B2

UB

J1

WAIT

J2

CLK

J3

ADV

IS66WVC2M16ECLL-7010BLI
[N/A]

U5

G2

A19

H1

A18

D3

A17

E4

A16

F4

A15

F3

A14

G4

A13

G3

A12

H5

A11

H4

A10

H3

A9

H2

A8

D4

A7

C4

A6

C3

A5

B4

A4

B3

A3

A5

A2

A4

A1

A3

A0

B5

CS1

G5

WE

A2

OE

A1

LB

B2

UB

IS66WV1M16EBLL-55BLI

U6

H6

I/O15
I/O14
I/O13
I/O12
I/O11
I/O10

I/O9
I/O8
I/O7
I/O6
I/O5
I/O4
I/O3
I/O2
I/O1
I/O0

CRE

VDD

VDDQ

VSS

VSSQ

I/O15
I/O14
I/O13
I/O12
I/O11
I/O10

I/O9
I/O8
I/O7
I/O6
I/O5
I/O4
I/O3
I/O2
I/O1
I/O0

CS2
VDD
VDD
GND
GND

NC
NC
NC
NC

NC
NC

PSRAM_A[0..20]

G1

PSRAM_D15

F1

PSRAM_D14

F2

PSRAM_D13

E2

PSRAM_D12

D2

PSRAM_D11

C2

PSRAM_D10

C1

PSRAM_D9

B1

PSRAM_D8

G6

PSRAM_D7

F6

PSRAM_D6

F5

PSRAM_D5

E5

PSRAM_D4

D5

PSRAM_D3

C6

PSRAM_D2

C5

PSRAM_D1
PSRAM_D0

B6
E3
J4
J5
J6

A6
D6
E1
E6
D1

PSRAM_D15

G1

PSRAM_D14

F1

PSRAM_D13

F2

PSRAM_D12

E2

PSRAM_D11

D2

PSRAM_D10

C2

PSRAM_D9

C1

PSRAM_D8

B1

PSRAM_D7

G6

PSRAM_D6

F6

PSRAM_D5

F5

PSRAM_D4

E5

PSRAM_D3

D5

PSRAM_D2

C6

PSRAM_D1

C5

PSRAM_D0

B6

E3

H6

H6

A6
D6
E1
D1
E6

CRE_CS2

VDD_VCORE
VDD_VDDQ

R12
10K

[N/A]

CRE_CS2
VDD_VCORE
VDD_VDDQ

C16

100nF

PD10
PD9
PD8
PE15
PE14
PE13
PE12
PE11
PE10
PE9
PE8
PE7
PD1
PD0
PD15
PD14

PD10
PD9
PD8
PE15
PE14
PE13
PE12
PE11
PE10
PE9
PE8
PE7
PD1
PD0
PD15
PD14

32M bits
Synchronous PSRAM

3.3V I/Os only

1.8V CORE only

i PSRAM_D

Impedance Constraint [Min = 40 Max = 60 ]
Matched Net Lengths [ Tolerance = 200 mil ]

16M bits
Asynchronous PSRAM
functional at 3.3V only

PSRAM_VDD

10KR8

SB5

C14

100nF

PSRAM_VDD

PSRAM

Title:

STM32L4R9I-DISCOProject:

Size: Reference:

A4

28/08/2017

Date: Sheet: of

PSRAM_D[0..15]
PSRAM_NE1
PSRAM_NBL0
PSRAM_NBL1
PSRAM_WE
PSRAM_OE
PSRAM_WAIT
PSRAM_CLK
PSRAM_ADV

PSRAM_A[0..20]

PSRAM_D[0..15]
PSRAM_NE1
PSRAM_NBL0
PSRAM_NBL1
PSRAM_WE
PSRAM_OE
PSRAM_WAIT
PSRAM_CLK
PSRAM_ADV

PSRAM

SB39 for U6 only

SB39

SB38

MB1311 C

Revision:

11 14

PSRAM_VDD

PSRAM

1V8_LCD

66/78 DocID030906 Rev 2

Figure 31. 32L4R9IDISCOVERY camera

CAMERA is exclusive with some STMod+ , PMOD and ARDUINO signals

DCMI_D[0..7]

DCMI_PIXCK
DCMI_HSYNC
DCMI_VSYNC

DCMI_CLK

DCMI_PWR_EN

DCMI_NRST

DCMI_I2C

DCMI_D[0..7]

DCMI_PIXCLK
DCMI_HSYNC
DCMI_VSYNC

PA8

MFX_GPIO12

I2C

SDA
SCL

DCMI_PWR_EN
DCMI_NRST

CAUTION : Following D CMI signals are multiplexed with other
functions. In case CAMERA module is plug ged, take care that the
corresponding features are disconnected or well configu red :

DCMI_D0 : STMod+_INT
DCMI_D1 : DFDATIN3 (STMod+)
DCMI_D4 : PSRAM_A20 (only in case of U6 PSRAM is used)
DCMI_D6 : STMod+_PWM
DCMI_D7 : STMod+_RESET
DCMI_HSYNC/DE : STMod+_ADC and ARD_D7

CN2

1
2

DCMI_D0
DCMI_D1
DCMI_D2
DCMI_D3
DCMI_D4
DCMI_D5
DCMI_D6
DCMI_D7

DCMI_PIXCLK

DCMI_HSYNC

DCMI_VSYNC

VDD

Camera_CLK

22R4

DCMI_I2C1_SDA
DCMI_I2C1_SCL

VDD

PC6
PC7
PH11
PH12
PE4
PI4
PB8
PI7

PH5

PA4

PI5

PG13
PB6

C46
22uF

3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

FPU330ZH-BT1D3-CA

Camera is functional with 3V3 only

C3
100nF

Schematics UM2271

Camera

Title:

STM32L4R9I-DISCOProject:

Size: Reference:

A4

28/08/2017

Date: Sheet: of

MB1311 C

Revision:

12 14

DocID030906 Rev 2 67/78

(

)

UART

STMOD+_UART RX

SPI

STMOD+_SPI MISO

I2C

STMOD+_I2C

STMOD+_MOSIs

STMOD+_MISOs

USART3_TX
SPI2_MOSIp

USART3_RX
SPI2_MISOp

SB22

USART3_RTS
SPI2_CLK

Figure 32. 32L4R9IDISCOVERY STMOD+ interface

CAUTION : Following STMod+/PMOD s ignals are multiplexed or shared with other functions. In case
STMod+/PMOD module is plugged, take care that the corresponding features are disconnected or well configured :

(*)
STMOD+/PMOD USART3_TX (PB10) may also use DSI_USART_TX option
STMOD+/PMOD SPI2_MOSIp (PB15) shared with ARD_D11 and DSI_SPI2_MOSI option
STMOD+/PMOD SPI2_MISOp (PB14) shared with ARD_D12 and DSI_SPI_DCX option
STMOD+/PMOD SPI2_SCK (PB13) shared with ARD_D13 and DSI_SPI2_SCK option
STMOD+ I2C3 SCL (PG7) shared with ARD_D15 (I2C3_SCL)
STMOD+ I2C3 SDA (PG8) shared with ARD_D14 (I2C3_SDA)

VDD

R46
10K

R45
10K

PMOD#1
PMOD#2
PMOD#3
PMOD#4

MFX_GPIO6

MFX_GPIO7

PA6

CTS

TX

RTS

CS

MOSI

CLK

SCL

SDA

PB10 (*)
PB15 (*)

PB11
PB14 (*)

PA15
PB13 (*)

USART3_CTS

PB10 (*)

USART3_TX

PB11

USART3_RX

PA15

USART3_RTS

PA6

SPI2_CS

PB15 (*) PC2 (*)

SPI2_MOSIp

PB14 (*)

SPI2_MISOp

PB13 (*)

SPI2_CLK

PG7 (*)

I2C3_SCL

PG8 (*)

I2C3_SDA

PI3

PI2

U21

15

1S1

1

1S2

4

2S1

6

2S2

7

3S1

9

3S2

12

4S1

14

4S2

11

GND

STG3692QTR

1-2SEL

3-4SEL

VCC

SB20
SB16
SB18

SB21
SB17
SB19

C47
1uF

PMOD_SEL_0

PMOD#2

PMOD#3

PMOD_SEL_1

PMOD#4

VDD

3

MOSIp/TX

16

D1

5

MISOp/RX

D2

10

8

D3

13

SCK/RTS

D4

2

STMod+

GND

CN1

1

11

2

12

3

13

4

14

5

15

6

16

7

17

8

18

9

19

10

20

SQT-110-01-F-D-RA

ATOM FH200210C-12000

STMOD+_SEL_0

STMOD+_SEL_1

(*)
STMOD+ INT (PC6) in conflict with DCMI_D0 (Camera)
STMOD+ RESET (PI7) in conflict with DCMI_D7 (Camera)
STMOD+ ADC (PA4) in conflict with ARD_D7 and DCMI_HSYNC (Camera)
STMOD+ PWM (PA5) in conflict with ARD_A5
STMOD+ DFDATIN1 (PB12) in conflict with MEMs microphones (use SB1 in audio page)
STMOD+ DF_CKOUT (PC2) in conflict with MEMs microphones
DFDATIN3

PC7) in conflict with DCMI_D1 (Camera

PMOD#11

+5V
GND+5V

PC6 (*)
PI7 (*)
PA4 (*)
PA5 (*)

PB12 (*)

PC7 (*)
PC2 (*)

PMOD#12

STMOD+_INT

STMOD+_RESET

STMOD+_ADC

STMOD+_PWM

DFDATIN1
DF_CKOUT

DFDATIN3

PMOD

PMOD#1
PMOD#2
PMOD#3
PMOD#4

GND GND
+3V3 +3V3

CN3

1
2
3
4
5
6

SSW-106-02-F-D-RA

ATOM FH254206C-1600

PMOD#11

7

PMOD#12

8

9
10
11
12

UM2271 Schematics

UART/SPI

SPI UART
STMOD+_SEL_0
STMOD+_SEL_1
PMOD#1 (PA6)

PMOD#2
PMOD#3
PMOD#4

(*) default configuration to support MikroBus modules using MB1280 fan-out board

1(*) 1

0

00(*)

MOSIp

TX

MISOp

RX

SCK

1

CTSCSCS
TX
RX
RTSSCK

STMOD+ Interface

Title:

STM32L4R9I-DISCOProject:

Size: Reference:

A4

28/08/2017

Date: Sheet: of

MB1311 C

Revision:

13 14

68/78 DocID030906 Rev 2

AGND

+1V8

CKOUT
DATIN1
LR
MIC_VDD

SB29

AUDIO_RST

Figure 33. 32L4R9IDISCOVERY Audio and DFSDM

1V8_CODEC

U26

27

C82

C81

1uF

100nF

C71

AGND

AGND

MFX_GPIO15

0R82

MIC_VDD

1

324

5

1uF

VDD

AGND

R59
100K

R83
10K

MIC_VDD

PH2

U3
ESDALC6V1W5

1V8_CODEC

C74

C57

100nF

100nF

SB30

C80

100nF

low ESR ceramic capacitor

low ESR ceramic capacitor

C1
100nF

C2
100nF

VD

12

VA

5

VA_HP

26

VL

7

GND_HP

1uFC63

9

VSS_HP

8

FLYN

1uFC68

6

FLYP

23

AIN1A

24

AIN1B

19

AIN2A

20

AIN2B/BIAS

1uFC62

17

MICIN1/ AIN3A

MICIN2/ BIAS/AIN3B

25

RESET

CS42L51-CNZ

I2C address of CS42L51 is 0x94 (AD0=0)

R1
10K

U2

VDD1LR

CLK

GND5DOUT

MP34DT01TR-M

U1

VDD1LR

CLK

GND5DOUT

MP34DT01TR-M

LR

SCL/CCLK

SDA/CDIN

DAC_FILT+
ADC_FILT+

2
3
4

2
3
4

MCLK

SCLK
LRCK

SDIN

SDOUT

AD0/CS

AOUTA

AOUTB

AFILTA
AFILTB

AGND

GND
GND

VQ

30
31
1
32
29

4
3
2

AGND

AGND

11

10

14
16
21
22
15

18
13
28
33

SB1

PE2
PE5
PB9
PE6
PB5

PB6
PG13

R64
2K2

10KR80

PC2

PB12

C70
100nF

SAI1_MCKA
SAI1_SCKA
SAI1_FSA
SAI1_SDA
SAI1_SDB

I2C1_SCL
I2C1_SDA

50R58

50R57

CKOUT

DATIN1

C55
1uF

22nFC59

22nFC58

C77

150pF

must be C0G

DFSDM

CKOUT

DATIN1

SAI

SAI_MCKA
SAI_SCKA
SAI_FSA
SAI_SDA
SAI_SDB

I2C

SCL
SDA

C76
150pF

C54
10uF

DFSDM

CODEC

CODEC_I2C

C56
1uF

AGND

MIC_VDD

C45

[N/A]

C44

[N/A]

U22

1

I/O1

2

GND
I/O23I/O3

ESDA6V1BC6

R44 [N/A]

U20 [N/A]

U19 [N/A]

AGND

6

I/O4

5

GND

4

VDD5LR

CLK

GND3DOUT

VDD5LR

CLK

GND3DOUT

AGND

2
4
1

2
4
1

CN12

3
6

4
2

PJ3028B-3

CKOUT

Schematics UM2271

Audio&DFSDM

Title:

STM32L4R9I-DISCOProject:

Size: Reference:

A4

28/08/2017

Date: Sheet: of

MB1311 C

Revision:

14 14

Figure 34. Round DSI display board (MB1314)

11

1.2" DSI LCD with Capacitive Touch

MB1314 B.1

6/1/2017

Title:

Size: Reference:

Date: Sheet: of

A4

Revision:

STM32L4Rx-EVALDaughter boardProject:

I2C_SDA

I2C_SCL

DSI_INT

DSI_BL_CTRL

Connector for motherboard

HSSI_CLK_N

HSSI_CLK_P

HSSI_D0_N

HSSI_D0_P

DSI_TE

DSI_RST

112

2

334

4

556

6

778

8

9910

10

111112

12

131314

14

151516

16

171718

18

191920

20

212122

22

232324

24

252526

26

272728

28

292930

30

313132

32

333334

34

353536

36

373738

38

393940

40

414142

42

434344

44

454546

46

474748

48

494950

50

515152

52

535354

54

555556

56

575758

58

595960

60

61

61

62

62

63

63

64

64

CN1

QTH-030-02-F-D-A-K-TR

BLGND

GND

1

XRES

2

DSI_D0N3SWIRE

4

DSI_D0P5OTP

6

GND

7

TE

8

DSI_CLKN9GND

10

DSI_CLKP11GND

12

GND

13

GND

14

VDDIO

15

VCI

16

GND

17

GND

18

ELVSS19ELVDD

20

ELVSS21ELVDD

22

ELVSS23ELVDD

24

PAD

25

PAD

26

PAD

27

PAD

28

CN2

504208-2410

HSSI_CLK_N
HSSI_CLK_P

HSSI_D0_N
HSSI_D0_P

DSI_TE

DSI_RST

Touch panel connector for LCDpanel

C7
100nF

VDD

DSI_RST

DSI_INT

VDD

R1
4K7

I2C_SDA

I2C_SCL

FPC05008-09200(ATOM)

GND

6

GND

1

INT

2

SCL

4

SDA

5

RESET

3

VCC

8

IOVCC

7

CN3

FH19C-8S-05SH

C8
100nF

+3V3

SWIRE

+3V3VDD

ELVDDELVSS

C1

100nF

+3V3

VDD

C2

100nF

SWIRE_MCU

PVIN

A1

LX3

A2

LX1

A3

LX2

B1

AVDD

B2

PGND

B3

VO2

C1

AGND

C2

VO1

C3

END1Swire

D2

AVIN

D3

U1
SM3321

BLGND

BLGND

BLGND

BLGND

BLGND

BLGND

ELVDD ELVSS

BLGND

SWIRE

SWIRE_MCU

R3
[N/A]

R2
[N/A]

SB3

SB4

SB2

L1
DFE201610E-4R7M=P2

C9

GRM188R61A106KE69D

H1

390x390 pixels DSI LCD

ZZ1

IEG1120TB103GF-001

R4
[N/A]

BLGND

SB5

DSI_BL_CTRL

SB1

Rev B.1: BLVDDuse +3V3, add L3, L4, C11 and C12, remove D1,D2

2. L1, L2 footprint update0806L

3. RevB, remove C11

C6
100nF

C3
100nF

L2

DFE201610E-4R7M=P2

C10
GRM188R61A106KE69D

C5
GRM188R61A106KE69D

C4
GRM188R61A106KE69D

I2C address: 0x70

+3V3

L3

BEAD(FCM1608KF-601T03)

C12

100nF

L4
BEAD(FCM1608KF-601T03)

BLGND

C11
10uF

UM2271 Schematics

DocID030906 Rev 2 69/78

70/78 DocID030906 Rev 2

11

Fanout Board

MB1280 A.2

10/10/2017

Title:

Size: Reference:

Date: Sheet: of

A4

Revision:

STM32H7-DK-DBProject:

1
2
3
4
5
6
7
8
9
10

11
12
13
14
15
16
17
18
19
20

CN1

TMM-110-01-L-D-RA

STMOD#11-INT
STMOD#12-RST
STMOD#13-ADC
STMOD#14-PWM

STMOD#17-DF-D3
STMOD#18-DF-CK3
STMOD#19-DF-D7
STMOD#20-DF-CK7

+5V

STMOD#1
STMOD#2
STMOD#3
STMOD#4

STMOD#11
STMOD#12

STMod+

1
2
3
4

5
6
7
8

CN4

Header 4X2A

1
2
3
4

CN3

1125S-SMT-4P

1
2
3
4
5
6
7
8
9
10

CN12

PAD 1X8

STMOD#7
STMOD#8
STMOD#9
STMOD#10

STMOD#13
STMOD#14

STMOD#17
STMOD#18
STMOD#19
STMOD#20

VCC

R1

4K7[N/A]

R2
4K7[N/A]

I2C_SCL

I2C_SDA

2

13

G

SD

T2
BSN20[N/A]

2

13

G

SD

T1
BSN20[N/A]

1
2
3
4
5
6
7
8
9

10

CN9

PAD 1X8

1
2
3
4
5
6
7
8

CN11

Header 8X1_Female

1
2
3
4
5
6
7
8

CN10

Header 8X1_Female

STMOD#1

STMOD#2

STMOD#3

STMOD#4

STMOD#7

STMOD#8

STMOD#9

STMOD#10

STMOD#1

STMOD#2

STMOD#3

STMOD#4

STMOD#7

STMOD#8

STMOD#9

STMOD#10

STMOD#11STMOD#12

STMOD#13 STMOD#14

STMOD#17
STMOD#18

STMOD#19
STMOD#20

STMOD#11STMOD#12

STMOD#13 STMOD#14

STMOD#3

STMOD#2

STMOD#11

STMOD#14

STMOD#12

STMOD#13

STMOD#7

STMOD#10

I2C_SCL
I2C_SDA

VCC

+5V

+5V+3V3

STMOD#1-NSS/CTS
STMOD#2-MOSIp/TX
STMOD#3-MISOp/RX
STMOD#4-SCK/RTS

STMOD#7-SCL
STMOD#8-MOSIs
STMOD#9-MISOs
STMOD#10-SDA

AN
RST
CS
SCK
MISO
MOSI
+3.3V
GND

PWM
INT
RX
TX
SCL
SDA
+5V
GND

GND
GPIO2
GPIO0
TXD

RXD
CH_PD
RST
VCC

+5V +3V3

+3V3+5V VCC

+3V3

STMOD#7

STMOD#10

I2C_SCL

I2C_SDA

Only PAD for bread board connection

support Grove- Barometer sensor (BMP180)

Mikrobus connectors

Bread board connectors

ESP-01 connector

Grove connector

3

2

1

JP1

TP1
Ground

closed pin2 and pin3 for default

support Grove- LCD RGB Backlight

1
2
3
4

CN2

1125S-SMT-4P

VCC

support Grove- NFC

STMOD#2

STMOD#3

TX

RX

SCL
SDA

C2

1uF_X5R_0603

C5
10nF_X7R_0603

C3
1uF_X5R_0603

C1
100nF

C4
100nF

51

2

GND

3

4

BYPASS

EN

Vin Vout

U1 LDK120M33R

SB2 Closed

SB1 Closed

ATOM: PH200210C-07000

+5V

+3V3

Only PAD for Power

1
2

CN5

PAD 2

1
2

CN6

PAD 2

+5V

+3V3

Only PAD for Power

1
2

CN7

PAD 2

1
2

CN8

PAD 2

Figure 35. Fanout board (MB1280)

Schematics UM2271

UM2271 Fanout board (MB1280)

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Appendix E Fanout board (MB1280)

The Fanout board (see Figure 36) is included in the 32L4R9IDISCOVERY kit. It is
connectible to STMod+ connector (CN1) and it provides access to:

• MikroElektronika Click board compatible connectors (CN10 and CN11: two 1x8-pin
female connectors)

• ESP-01 compatible connector (CN4: 2x4-pin female connector)

• Seeed Studio™ Grove compatible connectors (CN3 and CN2: two 1x4-pin male

connectors)

• Reserved standard 2.54 mm pitch of STMod+ pin header for breadboard.

The main active component for this Fanout board is the 3.3 V regulator U1 (200 mA).

Figure 36. STMod+ Fanout module plugged into CN1 connector

E.1 MikroElektronika mikroBUS™ compatible connector

(Fanout CN10 / CN11)

The mikroBUS compatible connector is 2.54 mm pitch with a pair of 1x8-pin female
connectors.

Tabl e 33 shows the definition of the pins.

DocID030906 Rev 2 71/78

77

Fanout board (MB1280) UM2271

1. Please refer to Appendix C to check STMod+ pin sharing with other functions of the 32L4R9IDISCOVERY

Table 33. Description of the mikroBUS connectors (CN11 and CN10)

STMod+ connector

CN11 number

STMod+#13-ADC AN 1 1 PWM STMod+#14-PWM

STMod+#12-RST RST 2 2 INT STMod+#11-INT

STMod+#1-CS CS 3 3 RX STMod+#3-RX

STMod+#4-SCK SCK 4 4 TX STMod+#2-TX

STMod+#9-MISOs MISO 5 5 SCL STMod+#7-SCL

STMod+#8-MOSIs MOSI 6 6 SDA STMod+#10-SDA

- +3.3 V 7 7 +5 V STMod+#6#15 +5V

STMod+#5#16 GND GND 8 8 GND STMod+#5#16 GND

Function of

mikroBUS

Pin

number

Pin

number

Function of

mikroBUS

The mikroBUS pinout assignment is available at the: http://mikroe.com website.

E.2 ESP-01 Wi-Fi® board compatible connector

The ESP-01 Wi-Fi board connector is 2.54 mm pitch with 2x4-pin female connectors.

Tabl e 34 shows the definition of the pins.

Table 34. Description of the ESP-01 Wi-Fi board connector pins

(1)

STMod+ connector

CN10 number

(1)

STMod+ connector

number

STMod+#5#16 GND GND 1 8 TXD STMod+#3-RX

STMod+#14 GPIO2 2 7 CH_PD STMod+#13

STMod+#11 GPIO0 3 6 RST STMod+#12-RST

STMod+#2-TX RXD 4 5 VCC -

1. Please refer to Appendix C to check STMod+ pin sharing with other functions of the 32L4R9IDISCOVERY.

Function of

ESP-01

Pin

number

Pin

number

Function of

ESP-01

STMod+ connector

E.3 Compatible connectors for the Grove boards

The two connectors of the Grove board are 2.54 pitch with 1x4-pin male connectors, the
part number is 1125S-SMT-4P.

E.3.1 Compatible connector for I2C Grove boards (Fanout CN3)

The CN3 connector is compatible with Grove- Barometer sensor (BMP180) and Grove-LCD
RGB Backlight boards using cable for connection.

Tabl e 35 shows the definition of the pins.

number

72/78 DocID030906 Rev 2

UM2271 Fanout board (MB1280)

Table 35. Description of the I2C Grove board connector pins (CN3)

STMod+ connector NO. Function of Grove CN3 Pin number

STMod+#7-SCL SCL 1

STMod+#10-SDA SDA 2

STMod+#6#15 +5 V VCC 3

STMod+#5#16 GND GND 4

1. Please refer to Appendix C to check STMod+ pin sharing with other functions of the 32L4R9IDISCOVERY.

E.3.2 Compatible connector for UART Grove boards (Fanout CN2)

The CN2 connector is compatible with Grove-NFC boards using cable for connection.

Tabl e 36 shows the definition of the pins.

1. Please refer to Appendix C to check STMod+ pin sharing with other functions of the 32L4R9IDISCOVERY.

Table 36. Description of the UART Grove board connector pins (CN2)

STMod+ connector Function of Grove CN2 Pin number

STMod+#3-RX RX (Grove TX) 1

STMod+#2-TX TX (Grove RX) 2

STMod+#6#15 +5 V VCC 3

STMod+#5#16 GND GND 4

(1)

(1)

DocID030906 Rev 2 73/78

77

Federal Communications Commission (FCC) and Industry Canada (IC) Compliance UM2271

Appendix F Federal Communications Commission (FCC)

and Industry Canada (IC) Compliance

F.1 FCC Compliance Statement

F.1.1 Part 15.19

This device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions: (1) this device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause undesired
operation.

F.1.2 Part 15.105

This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the user will be required to correct
the interference at his own expense.

F.1.3 Part 15.21

Any changes or modifications to this equipment not expressly approved by
STMicroelectronics may cause harmful interference and void the user's authority to operate
this equipment.

F.2 IC Compliance Statement

This device complies with FCC and Industry Canada RF radiation exposure limits set forth
for general population for mobile application (uncontrolled exposure). This device must not
be collocated or operating in conjunction with any other antenna or transmitter.

F.2.1 Compliance Statement

Notice: This device complies with Industry Canada licence-exempt RSS standard(s).
Operation is subject to the following two conditions: (1) this device may not cause
interference, and (2) this device must accept any interference, including interference that
may cause undesired operation of the device.

Industry Canada ICES-003 Compliance Label: CAN ICES-3 (A)/NMB-3(A)

F.2.2 Déclaration de conformité

Avis: Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux
appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions
suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil

74/78 DocID030906 Rev 2

UM2271 Federal Communications Commission (FCC) and Industry Canada (IC) Compliance

doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en
compromettre le fonctionnement

Étiquette de conformité à la NMB-003 d'Industrie Canada : CAN ICES-3 (A)/NMB-3(A)

DocID030906 Rev 2 75/78

77

CISPR32 UM2271

Appendix G CISPR32

G.1 Wa r n i ng

Warning: This device is compliant with Class A of CISPR32. In a residential environment,
this equipment may cause radio interference.

Avertissement: Cet équipement est conforme à la Classe A de la CISPR 32. Dans un
environnement résidentiel, cet équipement peut créer des interférences radio.

76/78 DocID030906 Rev 2

UM2271 Revision history

Revision history

Table 37. Document revision history

Date Revision Changes

17-Oct-2017 1 Initial version

Updated:

Chapter 10.6.1: clarification on SW1 use

26-Oct-2017 2

Table 4 : pin name ARD-5V
Table 5 : JP4 CHGR position description
Table 28: Unused functions
Table 30: Reserved solder bridges

DocID030906 Rev 2 77/78

77

UM2271

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© 2017 STMicroelectronics – All rights reserved

78/78 DocID030906 Rev 2