EmCraft STM32F4 Hardware Architecture

STM32F4 SOM (System-On-Module)

Baseboard

Hardware Architecture

Document No: STM-SOM-BSB-EXT-HA

Version: 1.1

Date: December 19, 2013

Emcraft Systems

Table of Contents

1. INTRODUCTION ................................................................................................................................. 3

2. HARDWARE PLATFORM ................................................................................................................... 3

2.1. OVERVIEW ........................................................................................................................................ 3

2.2. FUNCTIONAL BLOCK DIAGRAM ............................................................................................................ 4

2.3. SOM CONNECTORS .......................................................................................................................... 4

2.4. USB UART INTERFACE ..................................................................................................................... 4

2.5. ETHERNET INTERFACE ....................................................................................................................... 4

2.6. USB OTG INTERFACE ....................................................................................................................... 4

2.7. ARM JTAG INTERFACE ..................................................................................................................... 5

2.8. POWER ............................................................................................................................................ 5

2.9. RESET BUTTON ................................................................................................................................. 5

2.10. RESET LED ...................................................................................................................................... 5

2.11. USER BUTTON AND USER LED ........................................................................................................... 5

2.12. BREADBOARD AREA ........................................................................................................................... 5

3. CONNECTORS ................................................................................................................................... 5

3.1. SOM-BSB-EXT CONNECTORS .......................................................................................................... 5

3.2. MINI USB TYPE B CONNECTORS ........................................................................................................ 6

3.3. RJ45 ETHERNET CONNECTOR ............................................................................................................ 6

3.4. SOM INTERFACE CONNECTORS.......................................................................................................... 6

3.5. ARM JTAG CONNECTOR .................................................................................................................. 6

3.6. BREADBOARD AREA ........................................................................................................................... 7

4. JUMPERS ......................................................................................................................................... 16

5. LEDS ................................................................................................................................................. 17

6. SWITCHES ....................................................................................................................................... 17

7. DOCUMENT REVISION HISTORY ................................................................................................... 17

STM32F4 SOM (System-On-Module) Baseboard 2/17 Version 1.1
Hardware Architecture December 19, 2013

Emcraft Systems

1. Introduction

This document is the Technical Specification for the Emcraft Systems SOM (System-On­Module) baseboard (SOM-BSB-EXT).

The SOM-BSB-EXT is intended to provide a hardware platform for the evaluation and initial
custom product development with the Emcraft Systems STM32F4 SOM.

The SOM-BSB-EXT can be powered either from the USB port or from a separate external +5V
power supply.

All the unused pins of the STM32F4 SOM are routed to a breadboard area of the SOM-BSB­EXT, which facilitates hardware and software prototyping.

The SOM-BSB-EXT comes complete with the hardware schematics and Bill of Materials (BOM)
file, facilitating the design of custom baseboard hardware for the STM32F4 SOM.

2. Hardware Platform

This section defines the hardware platform of the SOM-BSB-EXT.

2.1. Overview

The SOM-BSB-EXT implements the following hardware facilities:

• Two 80-pin SOM connectors;

• USB UART and power interfaces on a mini-USB connector;

• 10/100 Mbps Ethernet interface on an RJ-45 connector;

• USB OTG Interface and a mini-USB connector;

• Standard 20-pin ARM JTAG interface for debugging of the STM32F4 Cortex-M4 MCU;

• LDO regulator for conversion of the USB +5V to the +3.3V SOM power supply;

• Reset push button;

• Reset-out LED;

• User push button connected to the GPIO of the STM32F4 SOM;

• Power Good LED indicating presence of the STM32F4 SOM +3.3V power;

• User-controlled LED connected to the GPIO of the STM32F4 SOM;

• Unused STM32F4 SOM signals available on the breadboard area;

• Possibility of providing necessary power supply voltages (+5V, +3.3V) from external

sources through dedicated pads of the breadboard area.

STM32F4 SOM (System-On-Module) Baseboard 3/17 Version 1.1
Hardware Architecture December 19, 2013

Emcraft Systems

SOM Connectors (P4, P6)

JTAG I/F

(

P3

, P5, JP2)

JP1

Reset
Button

(S1)

SOM

Reset Out

LED (DS1)

User

Button

(S2)

Power Good
LED (DS2)

ULPI USB PHY

Ethernet I/F

(P2)

USB OTG I

/F

(P

19

)

JP

3

LDO Regulator

+3.3V

+5

V USB

Breadboard Area

(P7-P14)

+5V External

Digital interfaces

GPIO signals

User LED

(DS4)

SOM Reset

+

5V

+3.3V

USB-UART

Bridge

USB Device I/F

(P

1)

Current

Switch

VBUS

+3,3 V External

2.2. Functional Block Diagram

Figure 1 is the functional block diagram of the SOM-BSB-EXT.

Figure 1: SOM-BSB-EXT Functional Block Diagram

2.3. SOM Connectors

The SOM-BSB-EXT provides two Hirose DF40 series connectors for the connection to the
STM32F4 SOM. The connectors are 80-pin, 0.4 mm pitch receptacles, providing 4 mm
stacking height.

2.4. USB UART Interface

The SOM-BSB-EXT provides a USB UART interface on the type B mini USB connector (P1).

The interface is provided using an FTDI FT232RL USB-UART bridge. The FT232RL UART TX
and RX pins are connected to the STM32F4 SOM serial console UART port.

2.5. Ethernet Interface

The SOM-BSB-EXT provides the 10/100 Mbps Ethernet interface using the P2 connector. This
is an RJ-45 Ethernet port providing 10 Mbps (10BASE-T) and 100 Mbps (100BASE-TX)
protocols.

The SOM-BSB-EXT provides two status LEDs integrated in the P2 connector. The LEDs are:

• Yellow, is used to indicate the 10/100 Mbps link status, when lit;

• Green, is used to indicate RX/TX activity, when blinking.

The LEDs are connected on the SOM-BSB-EXT between the STM32F4 SOM outputs and +3.3
V power supply.

2.6. USB OTG Interface

The SOM-BSB-EXT provides the USB OTG interface on the mini B USB connector (P19).

The interface is implemented using the USB ULPI interface of the STM32F4 MCU. On the
SOM-BSB-EXT the interface is converted to the USB OTG interface, using SMSC USB3300­EZK ULPI USB PHY device.

STM32F4 SOM (System-On-Module) Baseboard 4/17 Version 1.1
Hardware Architecture December 19, 2013

Emcraft Systems

For custom designs using the SOM-BSB-EXT schematics as a reference it is recommended to
include voltage suppressors such as Littelfuse’s PGB1010603M, onto the USB data lines
(USB_OTG_N, USB_OTG_P, USB_N, and USB_P) to improve a quality of the USB signals.

2.7. ARM JTAG Interface

The SOM-BSB-EXT provides the ARM JTAG interface on the P3 connector for debugging of
the STM32F4 MCU on the STM32F4 SOM.

The connector is a standard 20-pin JTAG port supported by standard Cortex-M4
programmers/emulators.

2.8. Power

The SOM-BSB-EXT receives the +5 V power from the P1 mini-USB connector. Additionally, it
is possible to supply an external +5 V power through the dedicated pad P10.2 of the SOM­BSB-EXT breadboard area. Configuration of the +5 V input power supply is defined by the
JP3 header. The default settings of the JP3 are: 1-3 open, 2-4 closed. For further details on
the JP3 settings, see Section 4.

The +3.3 V supply voltage for the STM32F4 SOM and other components of the SOM-BSB­EXT is derived from the +5 V input voltage using the TPS73733DCQ LDO regulator. The
regulator dissipates approximately 1 Watt and is mounted on a heatsink. The SOM-BSB-EXT
provides a green Power Good LED that indicates presence of the +3.3 V power on the output
of the LDO regulator.

It is possible to turn the LDO regulator off for debug purposes. To do so, the control signal
VCC3_EN (P10.6 pad of the SOM-BSB-EXT breadboard area) must be connected to the
ground.

2.9. Reset Button

The SOM-BSB-EXT provides the S1 reset button used to trigger a hardware reset of the SOM.

2.10. Reset LED

The Reset LED indicates the status of the nRESET_OUT signal of the SOM. The LED is lit when
nRESET_OUT is low.

2.11. User Button and User LED

The SOM-BSB-EXT provides the S2 user button and the DS4 user LED as a simple
input/output interface for testing and demonstration purposes.

For further details, refer to Sections 5 and 6.

2.12. Breadboard Area

All unused signal pins of the SOM are available on the breadboard area marked as P7-P14.
For further details, refer to Section 3.6.

3. Connectors

This section provides a full pin definition of all connectors available on the SOM-BSB-EXT.

3.1. SOM-BSB-EXT Connectors

Table 1 provides a summary of the SOM-BSB-EXT connectors:

STM32F4 SOM (System-On-Module) Baseboard 5/17 Version 1.1
Hardware Architecture December 19, 2013

Emcraft Systems

Connector

Description

P1

Mini USB Type B connector (USB UART interface)

P2

RJ-45 Ethernet connector

P3

ARM JTAG connector

P4, P6

SOM interface connectors

P5

Microsemi FlashPro JTAG connector

P7-P14

Breadboard area (no actual connectors installed)

P19

Mini USB Type B connector (USB OTG interface)

Pin

Signal

1

TX+

2

TX-

3

RX+

4, 5

Unused pair; terminated on the SOM-BSB-EXT

6

RX-

7, 8

Unused pair, terminated on the SOM-BSB-EXT

Pin

Signal

Type

Description

1

VCC3

Power

Reference voltage of the STM32F4 MCU.

2 - -

Not connected on SOM-BSB-EXT

3

JTAG_nTRST

Input

STM32F4 MCU JTAG controller reset.

4, 6, 8, 10,

GND

Power

Ground of the STM32F4 MCU.

5

JTAG_TDI

Input

JTAG data input to the STM32F4 MCU.

7

JTAG_TMS

Input

JTAG mode select.

9

JTAG_TCK

Input

JTAG clock signal to the STM32F4 MCU.

Table 1: SOM-BSB-EXT Connectors

3.2. Mini USB Type B Connectors

The P1 and P19 USB connectors have a standard USB mini-B receptacle pin-out.

3.3. RJ45 Ethernet Connector

The P2 is a standard RJ-45 NIC connector with the following definition:

Table 2: Ethernet Connector

3.4. SOM Interface Connectors

For the definition of the two 80-pin SOM connectors (P4 and P6) refer to the STM32F4 SOM
Hardware Architecture document.

3.5. ARM JTAG Connector

The P3 is a standard 20-pin ARM JTAG connector with the following definition:

12, 14, 16,
18, 20

STM32F4 SOM (System-On-Module) Baseboard 6/17 Version 1.1
Hardware Architecture December 19, 2013

Emcraft Systems

Pin

Signal

Type

Description

11, 17, 19

-

-

These pins are not connected to the SOM

13

JTAG_TDO

Output

JTAG data output from the STM32F4 MCU.

15

nRESET_IN

Input/Output

Reset signal of the STM32F4 MCU.

Breadboar

Signal

SOM

Connected To

1

VCC3

77, 79 on P4

STM32F4 SOM +3.3 V power supply.

2, 8, 10, 12,

GND

2, 3, 5, 8, 9, 11, 14, 57,

STM32F4 SOM ground.

3

ADC8

68 on P4

STM32F4 pin C13

4

ADC17

66 on P4

Not connected on STM32F4 SOM.

5

ADC9

64 on P4

STM32F4 pin D1

6

ADC18

40 on P4

STM32F4 pin N4

7

ADC10

52 on P4

Not connected on STM32F4 SOM.

9

ADC11

48 on P4

Not connected on STM32F4 SOM.

11

ADC12

55 on P4

STM32F4 pin L2

13

ADC13

58 on P4

Not connected on STM32F4 SOM.

15

ADC14

53 on P4

Not connected on STM32F4 SOM.

17

ADC15

50 on P4

STM32F4 pin A9

19

ADC16

42 on P4

Not connected on STM32F4 SOM.

connectors and are pulled to GND on SOM-
BSB-EXT.

Table 3: ARM JTAG Connector

3.6. Breadboard Area

The test points in the breadboard area are grouped as PCB patterns for 12x2 2 mm pitch
through-hole connectors (P7-P14) with the following definition:

d

Pin #

14, 16, 18,
20, 21, 22,
23, 24,

Name

Connector

Pin

75, 76 on P4;

1, 6, 7, 12, 20, 23, 24,
28, 29, 39, 52, 55 on
P6

(PI3/TIM8_ETR/SPI2_MOSI/I2S2_SD/
DCMI_D10/FMC_D27).

(EVENTOUT/RTC_AF2).

(PA4/SPI1_NSS/SPI3_NSS/USART2_CK/

DCMI_HSYNC/OTG_HS_SOF/I2S3_WS/LCD_VSYNC/
ADC12_IN4/DAC1_OUT).

STM32F4 SOM (System-On-Module) Baseboard 7/17 Version 1.1
Hardware Architecture December 19, 2013

(PF9/TIM14_CH1/FMC_CD/
SPI5_MOSI/SAI1_FS_B/ADC3_IN7).

(PB4/NJTRST/TIM3_CH1/SPI1_MISO/
SPI3_MISO/2S3ext_SD/EVENTOUT)
through resistor R35 (not installed by default).

Table 4: P7 Breadboard Area Connector

Emcraft Systems

Breadboard

Signal

SOM Connector

Connected To

1

VCC3

77, 79 on P4

STM32F4 SOM +3.3V power supply.

2, 4, 6, 8,

GND

2, 3, 5, 8, 9, 11,

STM32F4 SOM ground.

3

ADC0

70 on P4

STM32F4 pin P3

5

ADC1

60 on P4

STM32F4 pin N3

7

ADC4

56 on P4

STM32F4 pin D2

9

ADC5

54 on P4

Not connected on STM32F4 SOM.

11

ADC3

46 on P4

Not connected on STM32F4 SOM.

13

ADC2

44 on P4

STM32F4 pin D11

15

ADC6

51 on P4

STM32F4 pin L3

17

ADC7

47 on P4

STM32F4 pin A13

Breadboard

Signal

SOM Connector

Connected To

1

VCC3

77, 79 on P4

+3.3 V SOM power supply.

2

VCC1V5

78, 80 on P4

Not connected on STM32F4 SOM.

3

VBATT

74 on P4

STM32F4 pin C1 (VBAT).

4, 12, 21,

GND

2, 3, 5, 8, 9, 11,

STM32F4 SOM ground.

5

1V5_EN

72 on P4

Not connected on STM32F4 SOM.

6

UART_1_TXD

28 on P4

STM32F4 pin K1

Pin #

10,12, 14,
16, 18, 19,
20, 21, 22,
23, 24

Name

Pin

14, 57, 75, 76
on P4;

1, 6, 7, 12, 20,
23, 24, 28, 29,
39, 52, 55 on P6

(PA6/SPI1_MISO/TIM8_BKIN/TIM13_CH1/

DCMI_PIXCLK/TIM3_CH1/TIM1_BKIN/
LCD_G2/ADC12_IN6).

(PA0-WKUP/ADC123_IN0/WKUP).

(EVENTOUT/RTC_AF2).

Pin #

22, 23, 24

(PD3/SPI2_SCK/I2S2_CK/USART2_CTS/
FMC_CLK/LCD_G7).

(PF8/TIM13_CH1/FMC_NIOWR/SPI5_MISO/
SAI1_SCK_B/ADC3_IN6).

(PA15/JTDI/TIM2_CH1/TIM2_ETR/SPI1_NSS/
SPI3_NSS/I2S3_WS/EVENTOUT).

Table 5: P8 Breadboard Area Connector

Name

Pin

14, 57, 75, 76
on P4;

1, 6, 7, 12, 20,
23, 24, 28, 29,
39, 52, 55 on P6

STM32F4 SOM (System-On-Module) Baseboard 8/17 Version 1.1
Hardware Architecture December 19, 2013

(PF7/TIM11_CH1/FMC_NREG/SPI5_SCK/
UART7_Tx/SAI1_MCLK_B/ADC3_IN5).

Emcraft Systems

Breadboard

Signal

SOM Connector

Connected To

7

UART_1_RXD

31 on P4

STM32F4 pin K2

8

I2C_0_SCL

33 on P4

STM32F4 pin A5
9

I2C_0_SDA

27 on P4

STM32F4 pin B5

10

I2C_1_SDA

26 on P4

Not connected on STM32F4 SOM.

11

I2C_1_SCL

25 on P4

Not connected on STM32F4 SOM.

13

SPI0_DO

63 on P4

STM32F4 pin R15

14

SPI0_DI

65 on P4

STM32F4 pin R14

15

SPI0_nSS

73 on P4

STM32F4 pin B4

16

SPI0_CLK

71 on P4

STM32F4 pin D14

17

SPI1_nSS

69 on P4

Not connected on STM32F4 SOM.

18

SPI1_CLK

67 on P4

STM32F4 pin M11

19

SPI1_DI

61 on P4

Not connected on STM32F4 SOM.

20

SPI1_DO

59 on P4

Not connected on STM32F4 SOM.

Breadboard

Signal

SOM Connector

Connected To

1

VCC3

77, 79 on P4

STM32F4 SOM +3.3V power supply.

2

+5V_IN

N/A

SOM-BSB-EXT JP3 pin 1, external +5V power

Pin #

Name

Pin

(PF6/TIM10_CH1/FMC_NIORD/SPI5_NSS/
UART7_Rx/SAI1_SD_B/ADC3_IN4).

(PB8/TIM4_CH3/SDIO_D4/TIM10_CH1/
DCMI_D6/ETH_MII_TXD3/I2C1_SCL/
CAN1_RX/LCD_B6).

(PB7/TIM4_CH2/I2C1_SDA/
USART1_RX/FMC_NL).

(PB15/SPI2_MOSI/I2S2_SD/TIM1_CH3N/
TIM8_CH3N/TIM12_CH2/
RTC_50HZ/OTG_HS_DP) through resistor R19.

(PB14/SPI2_MISO/TIM1_CH2N/TIM12_CH1/
USART3_RTS/TIM8_CH2N/I2S2ext_SD/
OTG_HS_DM).

Pin #

(PB9/SPI2_NSS/I2S2_WS/TIM4_CH4/
TIM11_CH1/SDIO_D5/DCMI_D7/
I2C1_SDA/CAN1_TX/LCD_B7) through resistor

R21.

(PI1/SPI2_SCK/I2S2_CK/DCMI_D8/
FMC_D25/LCD_G6) through resistor R20.

(PH6/I2C2_SMBA/TIM12_CH1/ETH_MII_RXD2/
SPI5_SCK/DCMI_D8/FMC_SDNE1).

Table 6: P9 Breadboard Area Connector

Name

Pin

STM32F4 SOM (System-On-Module) Baseboard 9/17 Version 1.1
Hardware Architecture December 19, 2013

supply.

Emcraft Systems

Breadboard

Signal

SOM Connector

Connected To

3, 21, 22,

GND

2, 3, 5, 8, 9, 11,

STM32F4 SOM ground.

4

nRESET_OUT

15 on P4

STM32F4 pin J1 (NRST);

5

nRESET_IN

13 on P4

STM32F4 pin J1 (NRST);

6

VCC3_EN

N/A

SOM-BSB-EXT U2 pin 5 (+3.3 V LDO enable).

7

GPIO_90

37 on P4

Not connected on STM32F4 SOM.

8

GPIO_88

23 on P4

STM32F4 pin M6 (PB2-BOOT1/EVENTOUT);

9

GPIO_89

35 on P4

Not connected on STM32F4 SOM.

10

GPIO_87

21 on P4

STM32F4 pin F15

11

GPIO_86

19 on P4

STM32F4 pin A11 (PD7/USART2_CK/FMC_NE1).

12

GPIO_85

17 on P4

Not connected on STM32F4 SOM.

13

GPIO_91

39 on P4

Not connected on STM32F4 SOM.

14

GPIO_83

32 on P4

Not connected on STM32F4 SOM.

15

GPIO_92

41 on P4

Not connected on STM32F4 SOM.

16

GPIO_84

34 on P4

Not connected on STM32F4 SOM.

17

GPIO_93

43 on P4

Not connected on STM32F4 SOM.

18

GPIO_82

18 on P4

Not connected on STM32F4 SOM.

19

GPIO_94

45 on P4

Not connected on STM32F4 SOM.

20

GPIO_81

16 on P4

STM32F4 pin H15

Breadboard

Signal

SOM Connector

Connected To

1

VCC3

77, 79 on P4

STM32F4 SOM +3.3V power supply.

2, 23, 24

GND

2, 3, 5, 8, 9, 11,

STM32F4 SOM ground.

Pin #

23, 24

Name

Pin

14, 57, 75, 76
on P4;

1, 6, 7, 12, 20,
23, 24, 28, 29,
39, 52, 55 on P6

SOM-BSB-EXT DS1 LED.

SOM-BSB-EXT S1 reset button.

SOM-BSB-EXT DS4 LED.

(PA8/MCO1/USART1_CK/TIM1_CH1/
I2C3_SCL/ OTG_FS_SOF/LCD_R6).

Table 7: P10 Breadboard Area Connector

Pin #

STM32F4 SOM (System-On-Module) Baseboard 10/17 Version 1.1
Hardware Architecture December 19, 2013

Name

(PC6/I2S2_MCK/TIM8_CH1/SDIO_D6/
USART6_TX/DCMI_D0/TIM3_CH1/LCD_HSYNC).

Pin

14, 57, 75, 76
on P4;

1, 6, 7, 12, 20,
23, 24, 28, 29,
39, 52, 55 on P6

Emcraft Systems

Breadboard

Signal

SOM Connector

Connected To

3

GPIO_20

20 on P6

STM32F4 SOM ground.

4

GPIO_26

Not connected to STM32F4 SOM.

5

GPIO_18

18 on P6

Not connected on STM32F4 SOM (default

STM32F4 pin R3

6

GPIO_24

24 on P6

STM32F4 SOM ground.

7

GPIO_16

16 on P6

Not connected to STM32F4 SOM.

8

GPIO_22

22 on P6

Not connected on STM32F4 SOM (default

STM32F4 pin N2

9

GPIO_14

14 on P6

Not connected on STM32F4 SOM (default

STM32F4 pin B9

10

GPIO_28

28 on P6

STM32F4 SOM ground.

11

GPIO_6

6 on P6

STM32F4 SOM ground.

12

GPIO_30

Not connected to STM32F4 SOM.

13

GPIO_10

10 on P6

Not connected on STM32F4 SOM(default

STM32F4 pin N5

14

GPIO_32

Not connected to STM32F4 SOM.

15

GPIO_8

8 on P6

Not connected on STM32F4 SOM (default

STM32F4 pin P5

16

GPIO_34

Not connected to STM32F4 SOM.

17

GPIO_12

12 on P6

STM32F4 SOM ground.

18

GPIO_36

Not connected to STM32F4 SOM.

Pin #

Name

Pin

option).

(PA7/SPI1_MOSI/TIM8_CH1N/TIM14_CH1/

TIM3_CH2/ETH_MII_RX_DV/TIM1_CH1N/
ETH_RMII_CRS_DV/ADC12_IN7) through

resistors R31 and R12 (build-time option).

option).

(PA1/USART2_RTS/UART4_RX/

ETH_RMII_REF_CLK/ETH_MII_RX_CLK/
TIM5_CH2/TIM2_CH2/ADC123_IN1) through

resistor R32 (build-time option).

option).

(PG11/FMC_NCE4_2/ETH_MII_TX_EN/
ETH_RMII_TX_EN/DCMI_D3/LCD_B3) through
resistors R28 and R7 (build-time option).

option).

(PC4/ETH_RMII_RX_D0/ETH_MII_RX_D0/
ADC12_IN14) through resistors R30 and R11
(build-time option).

option).

(PC5/ETH_RMII_RX_D1/ETH_MII_RX_D1/
ADC12_IN15) through resistors R29 and R10
(build-time option).

STM32F4 SOM (System-On-Module) Baseboard 11/17 Version 1.1
Hardware Architecture December 19, 2013

Emcraft Systems

Breadboard

Signal

SOM Connector

Connected To

19

GPIO_4

4 on P6

Not connected on STM32F4 SOM (default

STM32F4 pin A8

20

GPIO_38

Not connected to STM32F4 SOM.

21

GPIO_2

2 on P6

Not connected on STM32F4 SOM (default

STM32F4 pin A7

22

GPIO_40

Not connected to STM32F4 SOM.

Breadboard

Signal

SOM Connector

Connected To

1

VCC3

77, 79 on P4

STM32F4 SOM +3.3V power supply.

2, 23, 24

GND

2, 3, 5, 8, 9, 11,

STM32F4 SOM ground.

3

GPIO_56

56 on P6

Not connected on STM32F4 SOM.

4

GPIO_62

62 on P6

STM32F4 pin B13

5

GPIO_58

58 on P6

Not connected on STM32F4 SOM.

6

GPIO_64

64 on P6

STM32F4 pin B14

7

GPIO_60

60 on P6

Not connected on STM32F4 SOM.

8

GPIO_66

66 on P6

STM32F4 pin F14

9

GPIO_54

54 on P6

Not connected on STM32F4 SOM.

10

GPIO_68

68 on P6

STM32F4 pin G14

11

GPIO_52

52 on P6

STM32F4 SOM ground.

12

GPIO_70

70 on P6

Not connected on STM32F4 SOM.

Pin #

Pin #

Name

Pin

option).

(PG13/FMC_A24/USART6_CTS/ETH_MII_TXD0/
ETH_RMII_TXD0/SPI6_SCK) through resistors
R27 and R9 (build-time option).

option).

(PG14/FMC_A25/USART6_TX/ETH_MII_TXD1/
ETH_RMII_TXD1/SPI6_MOSI) through resistors
R26 and R8 (build-time option).

Table 8: P11 Breadboard Area Connector

Name

Pin

14, 57, 75, 76
on P4;

1, 6, 7, 12, 20,
23, 24, 28, 29,
39, 52, 55 on P6

(PC11/I2S3ext_SD/SPI3_MISO/UART4_RX/
USART3_RX/SDIO_D3).

(PC10/SPI3_SCK/I2S3_CK/UART4_TX/
USART3_TX/SDIO_D2/LCD_R2).

(PC9/I2S_CKIN/MCO2/TIM8_CH4/SDIO_D1/
I2C3_SDA/DCMI_D3).

STM32F4 SOM (System-On-Module) Baseboard 12/17 Version 1.1
Hardware Architecture December 19, 2013

(PC8/TIM8_CH3/SDIO_D0/TIM3_CH3/
USART6_CK/DCMI_D2).

Emcraft Systems

Breadboard

Signal

SOM Connector

Connected To

13

GPIO_50

Not connected to STM32F4 SOM.

14

GPIO_72

72 on P6

STM32F4 pin A12

15

GPIO_44

Not connected to STM32F4 SOM.

16

GPIO_74

74 on P6

STM32F4 pin D12

17

GPIO_46

Not connected to STM32F4 SOM.

18

GPIO_76

76 on P6

Not connected on STM32F4 SOM.

19

GPIO_48

Not connected to STM32F4 SOM.

20

GPIO_78

78 on P6

Not connected on STM32F4 SOM.

21

GPIO_42

Not connected to STM32F4 SOM.

22

GPIO_80

80 on P6

Not connected on STM32F4 SOM.

Breadboard

Signal

SOM Connector

Connected To

1

VCC3

77, 79 on P4

STM32F4 SOM +3.3V power supply.

2, 23, 24

GND

2, 3, 5, 8, 9, 11,

STM32F4 SOM ground.

3

GPIO_61

61 on P6

STM32F4 pin D13
4

GPIO_59

59 on P6

STM32F4 pin E13

5

GPIO_63

63 on P6

STM32F4 pin E14
6

GPIO_57

57 on P6

STM32F4 pin E12

7

GPIO_65

65 on P6

STM32F4 pin G15

8

GPIO_55

55 on P6

STM32F4 SOM ground.

Pin #

Name

Pin

(PC12/UART5_TX/SDIO_CK/DCMI_D9/
SPI3_MOSI/I2S3_SD/USART3_CK) through

resistor R22.

(PD2/TIM3_ETR/UART5_RX/
SDIO_CMD/DCMI_D11).

SOM-BSB-EXT DS3 LED.

Pin #

Table 9: P12 Breadboard Area Connector

Name

Pin

14, 57, 75, 76
on P4;

1, 6, 7, 12, 20,
23, 24, 28, 29,
39, 52, 55 on P6

(PH15/TIM8_CH3N/DCMI_D11/
FMC_D23/LCD_G4).

(PH14/TIM8_CH2N/DCMI_D4/FMC_D22/LCD_G3).

(PI0/TIM5_CH4/SPI2_NSS/I2S2_WS/
DCMI_D13/FMC_D24/LCD_G5).

STM32F4 SOM (System-On-Module) Baseboard 13/17 Version 1.1
Hardware Architecture December 19, 2013

(PH13/TIM8_CH1N/CAN1_TX/FMC_D21/LCD_G2).

(PC7/I2S3_MCK/TIM8_CH2/SDIO_D7/
USART6_RX/DCMI_D1/TIM3_CH2/LCD_G6).

Emcraft Systems

Breadboard

Signal

SOM Connector

Connected To

9

GPIO_67

67 on P6

STM32F4 pin C14
10

GPIO_53

53 on P6

STM32F4 pin J15

11

GPIO_69

69 on P6

STM32F4 pin F4

12

GPIO_51

51 on P6

STM32F4 pin K12

13

GPIO_71

71 on P6

Not connected on STM32F4 SOM.

14

GPIO_49

49 on P6

STM32F4 pin L12

15

GPIO_73

73 on P6

Not connected on STM32F4 SOM.

16

GPIO_45

45 on P6

STM32F4 pin M13

17

GPIO_79

79 on P6

STM32F4 pin A2

18

GPIO_47

47 on P6

STM32F4 pin L13

19

GPIO_77

77 on P6

Not connected on STM32F4 SOM.

20

GPIO_43

43 on P6

STM32F4 pin M12

21

GPIO_75

75 on P6

Not connected on STM32F4 SOM.

22

GPIO_41

41 on P6

STM32F4 pin G4

Breadboard

Signal

SOM Connector

Connected To

1

VCC3

77, 79 on P4

+3.3 V SOM power supply.

2, 23, 24

GND

2, 3, 5, 8, 9, 11,

STM32F4 SOM ground.

Pin #

Name

Pin

(PI2/TIM8_CH4/SPI2_MISO/DCMI_D9/
I2S2ext_SD/FMC_D26/LCD_G7).

(PG6/FMC_INT2/DCMI_D12/LCD_R7).

(PH2/ETH_MII_CRS/FMC_SDCKE0/LCD_R0).

(PH12/TIM5_CH3/DCMI_D3/FMC_D20/LCD_R6).

(PH11/TIM5_CH2/DCMI_D2/FMC_D19/LCD_R5).

(PH9/I2C3_SMBA/TIM12_CH2/DCMI_D0/
FMC_D17/LCD_R3).

Pin #

(PE2/SPI4_SCK/SAI1_MCLK_A/
ETH_MII_TXD3/FMC_A23);

SOM-BSB-EXT S2 user button.

(PH10/TIM5_CH1/DCMI_D1/FMC_D18/LCD_R4).

(PH8/I2C3_SDA/DCMI_HSYNC/FMC_D16/LCD_R2).

(PH3/ETH_MII_COL/FMC_SDNE0/LCD_R1).

Table 10: P13 Breadboard Area Connector

Name

Pin

14, 57, 75, 76
on P4;

1, 6, 7, 12, 20,
23, 24, 28, 29,
39, 52, 55 on P6

STM32F4 SOM (System-On-Module) Baseboard 14/17 Version 1.1
Hardware Architecture December 19, 2013

Emcraft Systems

Breadboard

Signal

SOM Connector

Connected To

3

GPIO_25

25 on P6

STM32F4 pin B8
4

GPIO_19

19 on P6

STM32F4 pin E3

5

GPIO_23

23 on P6

STM32F4 SOM ground.

6

GPIO_17

17 on P6

STM32F4 pin L1

7

GPIO_21

21 on P6

STM32F4 pin D3

8

GPIO_15

15 on P6

STM32F4 pin J14

9

GPIO_27

27 on P6

STM32F4 pin B10

10

GPIO_13

13 on P6

STM32F4 pin N12

11

GPIO_29

29 on P6

STM32F4 SOM ground.

12

GPIO_11

11 on P6

STM32F4 pin B11
13

GPIO_31

31 on P6

STM32F4 pin D4

14

GPIO_9

9 on P6

STM32F4 pin E15

15

GPIO_33

33 on P6

STM32F4 pin C4

16

GPIO_7

7 on P6

STM32F4 SOM ground.

17

GPIO_35

35 on P6

STM32F4 pin C3

18

GPIO_5

5 on P6

STM32F4 pin C15
19

GPIO_37

37 on P6

STM32F4 pin C2

Pin #

Name

Pin

(PG12/FMC_NE4/USART6_RTS/SPI6_MISO/
LCD_B1/LCD_B4).

(PI10/ETH_MII_RX_ER/FMC_D31/LCD_HSYNC).

(PF10/FMC_INTR/DCMI_D11/LCD_DE/ADC3_IN8).

(PI9/CAN1_RX/FMC_D30/LCD_VSYNC).

(PG7/FMC_INT3/USART6_CK/DCMI_D13/LCD_CLK)
through resistor R25.

(PG10/FMC_NCE4_1/FMC_NE3/
DCMI_D2/LCD_B2/LCD_G3).

(PH7/I2C3_SCL/ETH_MII_RXD3/
SPI5_MISO/DCMI_D9/FMC_SDCKE1).

(PD6/SPI3_MOSI/I2S3_SD/SAI1_SD_A/
USART2_RX/FMC_NWAIT/LCD_B2).

(PI4/TIM8_BKIN/DCMI_D5/FMC_NBL2/LCD_B4).

(PA9/USART1_TX/TIM1_CH2/I2C3_SMBA/
DCMI_D0/OTG_FS_VBUS).

(PI5/TIM8_CH1/DCMI_VSYNC/
FMC_NBL3/LCD_B5).

(PI6/TIM8_CH2/DCMI_D6/FMC_D28/LCD_B6).

STM32F4 SOM (System-On-Module) Baseboard 15/17 Version 1.1
Hardware Architecture December 19, 2013

(PA11/USART1_CTS/CAN1_RX/TIM1_CH4/
LCD_R4/OTG_FS_DM).

(PI7/TIM8_CH3/DCMI_D7/FMC_D29/LCD_B7).

Emcraft Systems

Breadboard

Signal

SOM Connector

Connected To

20

GPIO_3

3 on P6

STM32F4 pin B15

21

GPIO_39

39 on P6

STM32F4 SOM ground.

22

GPIO_1

1 on P6

STM32F4 SOM ground.

Designation

Name

Settings

Description

JP1

VCC3

1-2 closed

The +3.3 V voltage from the output

1-2 open

The +3.3 V voltage from the output
3-4 closed

The +3.3V voltage from the output

3-4 open

The +3.3 V voltage from the output

JP2

JTAG Mode

1-2 open

The settings of JP2 do not affect the

3-4 open

JP3

VCC5

1-3 closed

The +3.3 V LDO regulator is

1-3 open

The +3.3 V LDO regulator is

Pin #

Name

Table 11: P14 Breadboard Area Connector

Pin

(PA12/USART1_RTS/CAN1_TX/TIM1_ETR/
LCD_R5/OTG_FS_DP).

4. Jumpers

The SOM-BSB-EXT provides the configurable jumpers listed in the table below. The default
settings are marked in bold:

of the U2 LDO regulator is applied to
the STM32F4 SOM and to the SOM­BSB-EXT.

of the U2 LDO regulator is applied to
the STM32F4 SOM and to the SOM­BSB-EXT through R35 160 mOhm
resistor. This setting enables
measuring power, voltage and
current of the +3.3 V rail using ARM
Energy Probe.

Selection

2-4 open

2-4 closed

of the U2 LDO regulator is applied to
the D1 double diode ORing scheme.
When present, this voltage is used to
provide the VBATT power supply for
the STM32F4 SOM RTC to spare the
lithium battery charge.

of the U2 LDO regulator is not
applied to the D1 double diode
ORing scheme.

STM32F4 SOM.

powered from the external +5 V
voltage through the P10.2 pad of the
breadboard area.

powered from the +5 V USB power
through the P1 mini USB connector.

STM32F4 SOM (System-On-Module) Baseboard 16/17 Version 1.1
Hardware Architecture December 19, 2013

Table 12: Jumpers

Emcraft Systems

Designation

Color

Description

DS1

Green

Indicates the status of nRESET_OUT signal of the

DS2 Green

Power Good LED. The LED is lit when the output on the

DS3 Green

User-controlled LED connected to the pin 75 on the P6

DS4 Green

User-controlled LED connected to the pin 77 on the P6
Integrated in the P2

Yellow

Ethernet Link/Activity status.

Integrated in the P2

Green

Ethernet 10/100 Mbps link status.

Switch

Type

Signal

Function

S1

Push button

nRESET_IN

SOM hardware reset.

S2

Push button

GPIO_79

User button connected to the pin 79 of

Revision

Date

Changes Summary

1.1

December 19, 2013

Changes in the SOM-BSB-EXT functional block

1.0

December 18, 2013

Initial version.

5. LEDs

The SOM-BSB-EXT provides the following LEDs:

STM32F4 SOM. The LED is lit when nRESET_OUT is 0.

Connected to the STM32F4 pin J1.

U2 LDO regulator is +3.3 V.

SOM connector (GPIO_80 signal).

Not connected on the STM32F4 SOM.

SOM connector (GPIO_88 signal).

Connected to the STM32F4 pin M6.

RJ45 Ethernet
connector

RJ45 Ethernet
connector

Table 13: LEDs

6. Switches

The SOM-BSB-EXT provides the following switches:

Table 14: Switches

7. Document Revision History

Connected to the STM32F4 pin J1.

the P6 SOM connector.

Connected to the STM32F4 pin A2.

diagram.

STM32F4 SOM (System-On-Module) Baseboard 17/17 Version 1.1
Hardware Architecture December 19, 2013