The STM32G081B-EVAL Evaluation board is a high-end development platform for Arm®
®
Cortex
Delivery controller interfaces (UCPD) compliant with USB Type-C r1.2 and USB PD
specification r3.0, two I2Cs, two SPIs, five USARTs, one LP UART, one 12-bit ADC, two
12-bit DACs, two GP comparators, two LP timers, internal 32KB SRAM and 128KB Flash,
CEC, SWD debugging support.
The full range of hardware features on the STM32G081B-EVAL Evaluation board includes
the mother board, the legacy peripheral daughterboard and the USB Type-C and Power
Delivery daughterboard, which help to evaluate all peripherals (USB Type-C connector with
USB PD, motor control connector, RS232, RS485, Audio DAC, microphone ADC, TFT LCD,
IrDA, IR LED, IR receiver, LDR, microSD
slot, RF E2PROM and temperature sensor… etc.) and to develop applications. An STLINK/V2-1 is integrated on the board as embedded in-circuit debugger and programmer for
the STM32 MCU
-M0+ core-based STM32G081RBT6 microcontroller with USB Type-C™ and Power
™
card, CEC on two HDMI connectors, smartcard
.
The daughterboard and extension connectors provide an easy way to connect a
daughterboard or wrapping board for your specific application.
The USB Type-C and Power Delivery daughterboard features two independent USB-C ports
controlled by STM32G0. USB-C port 1 is dual role power (DRP) and can provide up-to 45W
of power. USB-C Port 2 is sink only. Both supports USB PD protocol and alternate mode
functionality.
•STM32G081RBT6 Arm
of Flash memory and 32 Kbytes of RAM in LQFP64 package
•MCU voltage choice fixed 3.3 V or adjustable from 1.65 V to 3.6 V
2
•I
C compatible serial interface
•RTC with backup battery
•8-Gbyte or more SPI interface microSD
•Potentiometer
•4 color user LEDs and one LED as MCU low-power alarm
•Reset, Tamper and User buttons
•4-direction control and selection joystick
•Board connectors:
–5 V power jack
–RS-232 and RS485 communications
–Stereo audio jack including analog microphone input
–microSD™ card
–Extension I
2
–Motor-control connector
•Board extension connectors:
–Daughterboard connectors for legacy peripheral daughterboard or USB Type-C
and Power Delivery daughterboard
–Extension connectors for daughterboard or wire-wrap board
•Flexible power-supply options:
–5 V power jack
–ST-LINK/V2-1 USB connector
–Daughterboard
•On-board ST-LINK/V2-1 debugger/programmer with USB 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
®
, GCC-based IDEs.
®(a)
Cortex®-M0+ core-based microcontroller with 128 Kbytes
C connector
™
card
a. Arm is a registered trademark of Arm Limited (or its subsidiaries) in the US and/or elsewhere.
8/78UM2403 Rev 1
UM2403Features
Legacy peripheral daughterboard
•IrDA transceiver
•IR LED and IR receiver
•Light dependent resistor (LDR)
•Temperature Sensor
•Board connectors:
–Two HDMI connectors with DDC and CEC
–Smartcard slot
USB Type-C and Power Delivery daughterboard
•Multiplexer for USB3.1 Gen1 / DisplayPort™ input and Type-C port1 output
•Multiplexer for Type-C port2 input and DisplayPort output / USB2.0
•VCONN on Type-C port1
•USB PD on Type-C port1
•Board connectors:
–Type-C port1 DRP (Dual Role Port)
–Type-C port2 sink
–DisplayPort input
–DisplayPort output
–USB 3.1 Gen1 Type-B receptacle
–USB2.0 Type-A receptacle
–19 V power jack for USB PD
UM2403 Rev 19/78
77
Product markingUM2403
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
will not be at STMicroelectronics’ charge. In no event will STMicroelectronics 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 in the STM32 datasheet at www.st.com).
•next to the evaluation tool ordering part number, that is stuck or silkscreen printed on
the board
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
(b)
(b)
5 Demonstration software
The demonstration software, included in the STM32Cube MCU Package corresponding to
the on-board 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
®(a)
www.st.com web page.
a. macOS® is a trademark of Apple Inc., registered in the U.S. and other countries.
b. On Windows only
10/78UM2403 Rev 1
UM2403Ordering information
6 Ordering information
To order the STM32G081B-EVAL Evaluation board, refer to Tab le 1.
Order codeTarget STM32
STM32G081B-EVALSTM32G081RB
Table 1. Ordering information
7 Delivery recommendations
Some verifications are needed before using the board for the first time, to make sure that no
damage occurred during shipment and that no components are unplugged or lost.
When the board is extracted from its plastic bag, check that no component remains in the
bag. The main component to verify is microSD card which may have been ejected from the
connector CN8 (right side of the board).
Caution:There is an explosion risk if the battery is replaced by an incorrect one. Make sure to
dispose of used batteries according to the instructions.
UM2403 Rev 111/78
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Hardware layout and configurationUM2403
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8 Hardware layout and configuration
The STM32G081B-EVAL Evaluation board is designed around the STM32G081RBT6 (64pin LQFP package). The hardware block diagram
between STM32G081RBT6 and peripherals (motor control connector, RS232, RS485,
Audio DAC, microphone ADC, TFT LCD, CAN, IrDA, IR LED, IR receiver, LDR, MicroSD
card, CEC on two HDMI connectors, Smartcard slot, Temperature sensor… etc.) and
Figure 4 help users to locate these features on the Evaluation board.
Figure 3. Hardware block diagram
Figure 3 illustrates the connection
12/78UM2403 Rev 1
UM2403Hardware layout and configuration
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UM2403 Rev 113/78
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Hardware layout and configurationUM2403
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Figure 6. USB Type-C and Power Delivery daughterboard
14/78UM2403 Rev 1
UM2403Hardware layout and configuration
8.1 Embedded ST-LINK/V2-1
The ST-LINK/V2-1 programming and debugging tool is integrated on the STM32G081BEVAL Evaluation board. Compared to ST-LINK/V2 the changes are listed below.
The new features supported on ST-LINK/V2-1 are:
•USB software enumeration
•Virtual COM port interface on USB
•Mass storage interface on USB
•USB power management request for more than 100 mA power on USB
This feature is no longer supported on ST-LINK/V2-1:
•SWIM interface
For all general information concerning debugging and programming features common
between V2 and V2-1 refer to ST-LINK/V2 in-circuit debugger/programmer for STM8 and
STM32 User manual (UM1075) in the www.st.com website.
Note:It is possible to power the board via CN6 (Embedded ST-LINK/V2-1 USB connector) even if
an external tools is connected to CN12 or CN13 (External SWD connector).
8.1.1 Drivers
The ST-LINK/V2-1 requires a dedicated USB driver, which can be found on www.st.com for
Windows PC (7, 8 or 10).
In case the STM32G081B-EVAL Evaluation board is connected to the PC before the driver
is installed, some STM32G081B-EVAL interfaces 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.
Note:Prefer using the “USB Composite Device” handle for a full recovery.
Figure 7. USB Composite Device
8.1.2 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 lifetime of the ST-LINK/V2-1 product (for
example new functionality, bug fixes, support for new microcontroller families), it is
recommended to visit the www.st.com website before starting to use the STM32G081B-
EVAL board and periodically, to stay up-to-date with the latest firmware version.
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Hardware layout and configurationUM2403
8.2 Power supply
The STM32G081B-EVAL Evaluation mother board is designed to be powered by 5 V DC
power supply and is protected by PolyZen from wrong power plug-in event. It is possible to
configure the mother board to use any of the following four sources for the power supply:
•5 V DC power adapter connected to CN16, the power Jack on the board (Power
Supply Unit on silk screen of JP17 (PSU)). The external power supply is not provided
with the board.
•5 V DC power with 500 mA limitation from CN6, the USB Micro-B connector of
STLINK/V2-1 (USB 5 V power source on silkscreen of JP17 (STlk)). If the USB
enumeration succeeds, the ST-LINK U5V power is enabled, by asserting the PWR_EN
pin. This pin is connected to a power switch, which powers the board. This power
switch features also a current limitation to protect the PC in case of short-circuit on the
board. If overcurrent (more than 500 mA) happens on the board, the LED LD5 lights
up.
•5 V DC power from CN6 directly, the USB Micro-B connector of STLINK/V2-1 (USB 5 V
power source on silkscreen of JP17 (U5V)).
•5 V DC power from CN5 or CN9, the extension connector for daughterboard power
source (D5V) on silkscreen of JP19).
The UCPD daughterboard uses its own 19V power adapter to support USB PD, in this case
the mother board uses D5V from the UCPD daughterboard to supply all circuits on
STM32G081B-EVAL Evaluation board. D5V of the UCPD daughterboard has three sources
as below:
•19 V DC power adapter connected to CN3 on the UCPD daughterboard
•Power from Type-C Port1 CN7 on the UCPD daughterboard
•Power from Type-C port2 CN5 on the UCPD daughterboard
19 V DC power adapter and Type-C Port1 sources are automatically selected by circuit (D8
and T10 on the UCPD daughterboard). Refer to Table15 for detail.
16/78UM2403 Rev 1
UM2403Hardware layout and configuration
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The STM32G081B-EVAL Evaluation board can be powered from the ST-LINK/V2-1 USB
connector CN6 with a PC, but only the ST-LINK/V2-1 circuit has the power before USB
enumeration, because the host PC only provides 100
the USB enumeration, the STM32G081B-EVAL board requires 300
PC. If the host is able to provide the required power, the enumeration succeeds, the power
transistor U5 is switched ON, the red LED LD7 is turned ON, and thus the STM32G081BEVAL board is powered and can consume maximum 300 mA current. If the host PC is not
able to provide the requested current, the enumeration fails. Therefore the STM32 part
including the extension board is not powered. As a consequence the red LED LD7 remains
turned OFF. In this case it is mandatory to use an external power supply to supply extra
power.
E5V (from PSU) or D5V can be used as external power supply in case current consumption
of the STM32G081B-EVAL board exceeds the allowed current on USB. In this condition it is
still possible to use USB for communication, for programming or debugging only, but it is
mandatory to power the board first using E5V or D5V, and then connecting the USB cable to
the PC. Proceeding this way ensures that the enumeration succeeds thanks to the external
power source.
The following power sequence procedure must be respected:
mA to the boards at that time. During
mA power from the host
UM2403 Rev 117/78
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Hardware layout and configurationUM2403
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1.Connect jumper JP17 for PSU or D5V side
2. Check that JP5 is removed
3. Connect the external power source to PSU or D5V (daughterboard mounted)
4. Check red LED LD7 is turned ON
5. Connect the PC to USB connector CN6
If this order is not respected, the board may be powered by VBUS first then E5V or D5V,
and the following risks may be encountered:
1.If more than 300 mA current is needed by the board, the PC may be damaged or
current can be limited by PC. As a consequence the board is not powered correctly.
2. 300 mA is requested at enumeration (since JP5 must be OFF), so there is risk that
request is rejected and enumeration does not succeed if PC can't provide such current.
Consequently the board is not powered (LED LD7 remains OFF).
In case the STM32G081B-EVAL board is powered by an USB charger through CN6, there is
no USB enumeration needed. User can set JP17 to U5V to allow the board to be powered
anyway from CN6.
The power source is selected by setting the related jumpers JP17, JP15 and JP16 as
described in table 2.
Table 2. Power source related Jumpers
JumperDescription
JP17 is used to select one of the four possible power supply resources.
Only for power supply from USB (CN6) of ST-LINK/V2-1 to STM32G081B-EVAL, JP17 is set as
shown on the right:
Only for power supply from the daughterboard connectors(CN5 or CN9) to STM32G081BEVAL, JP17 is set as shown on the right: (default Setting)
JP17
Only for power supply jack(CN16) to the STM32G081B-EVAL, JP17 is set as shown on the
right:
Only for power supply from USB (CN6) to STM32G081B-EVAL without current limited, JP17 is
set as shown on the right:
18/78UM2403 Rev 1
UM2403Hardware layout and configuration
Table 2. Power source related Jumpers (continued)
JumperDescription
The Vbat pin of STM32G081RBT6 is connected to VDD when JP15 is set as shown on the right
(default setting):
JP15
The Vbat pin of STM32G081RBT6 is connected to 3V battery when JP15 is set as shown on the
right:
The VDD pin of STM32G081RBT6 is connected to 3.3V when JP16 is set as shown on the right
(default setting), when the UCPD daughterboard is used, this setting is mandatory:
JP16
The VDD pin of STM32G081RBT6 is connected to VDD_ADJ when JP16 is set as shown on the
right:
Note:The VDD_MCU Idd measurement can be done by current meter which mounted on JP11
when it is open. But JP11 is not allowed to be opened without current meter; otherwise
STM32G081RBT6 would be damaged due to lacking of power supply on its power pins.
Note:LD8 is lit when VDD < 2.7 V and in this case IOs and some Analog IPs of STM32G081RBT6
work with degraded performances.
Note:The UCPD daughterboard works with VDD=3.3V, so it is mandatory to close JP16 pin1 and
pin2.
The LED LD7 is lit when the STM32G081B-EVAL Evaluation board is powered by the 5V
correctly.
Tab le 3 shows the low voltage limitations that might apply depending on the characteristics
of some peripheral components. Components might work incorrectly when the power level
is lower than the limitation.
Two clock sources are available on STM32G081B-EVAL Evaluation board for
STM32G081RBT6 and RTC embedded.
•X2, 32KHz Crystal for embedded RTC
•X3, 8MHz Crystal for the STM32G081RBT6 microcontroller, it can be disconnected by
removing R45 and R46 when internal RC clock is used
JumperDescription
PC14 is connected to 32KHz crystal when SB18 is open (default setting).
SB18
SB19
PC14 is connected to extension connector CN9 when SB18 is closed. In such case R43 must be
removed to avoid disturbance due to the 32Khz quartz.
PC15 is connected to 32KHz crystal when SB19 is open (default setting).
PC15 is connected to extension connector CN9 when SB19 is closed. In such case R44 must be
removed to avoid disturbance due to the 32Khz quartz.
Table 4. 32 KHz crystal X2 related solder bridges
JumperDescription
PF0 is connected to 8MHz crystal when SB20 is open (default setting).
SB20
SB21
PF0 is connected to extension connector CN10 when SB20 is closed. In such case R45 must be
removed to avoid disturbance due to the 8Mhz quartz.
PF1 is connected to 8MHz crystal when SB21 is open (default setting).
PF1 is connected to extension connector CN10 when SB21 is closed. In such case R46 must be
removed to avoid disturbance due to the 8Mhz quartz.
Table 5. 8 MHz crystal X3 related solder bridges
8.4 Reset source
The general reset of the STM32G081B-EVAL Evaluation board is active low and the reset
sources include:
•Reset button B1
•Debugging Tools from SWD connector CN12 and CN13
•Daughterboard from CN4
•Embedded ST-LINK/V2-1
•RS232 connector CN11 for ISP.
Note:The jumper JP12 to be closed for RESET handled by pin8 of RS232 connector CN11 (CTS
signal), please refer to
Section 8.6.2 for detail.
20/78UM2403 Rev 1
UM2403Hardware layout and configuration
8.5 Boot Option
The STM32G081B-EVAL Evaluation board is able to boot from:
•Embedded User Flash
•System memory with boot loader for ISP
•Embedded SRAM for debugging
The boot option is configured by closing JP9 pin2-3 and setting one jumper cap on CN10
among pin 17, pin 19 and pin 21 and one option bit (see
Table 6. Boot related jumper
Table 6 and Tab le 7).
Jumper
configuration
Bit25 in USER
OPTION BYTES
CN10 pin 19 and
pin 17 closed by
XSTM32G081B-EVAL boot from User Flash (default setting)
jumper
CN10 pin 19 and
pin 21 closed by
0STM32G081B-EVAL boot from Embedded SRAM
jumper
CN10 pin 19 and
pin 21 closed by
1STM32G081B-EVAL boot from System Memory
jumper
Table 7. Boot0 related jumpers
JumperDescription
PA14-BOOT0 is used as SWCLK when JP9 is set as shown on the right (default setting).
JP9
The Bootloader_BOOT0 is managed by pin 6 of connector CN11 (RS232 DSR signal) and it is
connected to PA14-BOOT0 when JP9 is set as shown on the right. This configuration is used for
boot loader application only.
Boot from
8.6 Peripherals on mother board
8.6.1 Audio
The STM32G081B-EVAL Evaluation board supports stereo audio playback and microphone
recording by an external headset connected on audio jack CN15. Audio play is connected to
DAC output of STM32G081RBT6 through an audio amplifier and microphone on headset is
connected to ADC input of STM32G081RBT6 through a microphone amplifier. Audio
amplifier can be enabled or disabled by setting of JP18 and mono/stereo playback can be
chosen by setting of JP6, refer to
Tabl e 8 for detail.
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Hardware layout and configurationUM2403
Table 8. Audio related jumpers
JumperDescription
Speaker amplifier U17 is enabled when JP18 is closed (default setting)
JP18
Speaker amplifier U17 is disabled when JP18 is open
PA4 is connected to VIN1 of Audio amplifier when JP19 is closed (default setting)
JP19
PA4 is disconnected to VIN1 of Audio amplifier when JP19 is open
Mono playback is enabled when JP6 is set as shown on the right (default setting):
JP6
Stereo playback is enabled when JP6 is set as shown on the right:
Audio amplifier operates correctly when VDD > 2.2 V and microphone amplifier operates
correctly when VDD > 2.7
V.
8.6.2 RS232 and RS485
Communication through RS232 (with Hardware flow control CTS and RTS) and RS485 is
supported by D-type 9-pins RS232/RS485 connector CN11, which is connected to USART1
of STM32G081RBT6 on STM32G081B-EVAL Evaluation board. The signal
Bootloader_RESET (shared with CTS signal) and Bootloader_BOOT0 (shared with DSR
signal) are added on RS232 connector CN11 for ISP support.
By default, PC4 and PC5 are connected as TX and RX signals. PA9 and PA10 are also can
be connected as these two signals for bootloader which is NOT supported on PC4 and PC5
by setting of jumpers in
JumperDescription
RS232_RX is connected to RS232 transceiver and RS232 communication is enabled when
JP14 is set as shown on the right (default setting):
JP14
RS485_RX is connected to RS485 transceiver and RS485 communication is enabled when
JP14 is set as shown on the right:
PC4 is connected as TX signal without bootloader being supported when JP10 is set as shown
on the right (Default setting):
JP10
PA9 is connected as TX signal with bootloader being supported when JP10 is set as shown on
the right (CN1 motor control connector is needed to be open in this case):
Table 9.
Table 9. RS232 and RS485 related jumpers
22/78UM2403 Rev 1
UM2403Hardware layout and configuration
Table 9. RS232 and RS485 related jumpers (continued)
PC5 is connected as RX signal without bootloader being supported when JP8 is set as shown
on the right (default setting):
JP8
PA10 is connected as RX signal with bootloader being supported when JP8 is set as shown on
the right (in this case, CN1 motor control connector must be open):
The RS485 communication is supported by RS485 transceiver ST3485EBDR which
connected to pin4 and pin9 of D-type 9-pins connector CN11 (share same connector with
USART1).
JumperDescription
The external failsafe biasing are enabled when solder bridges SB29 and SB31 was closed
SB29,SB31
Default Setting: Not fitted
The bus termination is enabled when solder bridge SB32 is closed.
SB32
Default Setting: Not fitted
The AC termination is disabled when solder bridge SB30 is closed for high baud rate
SB30
communication.
Default Setting: Not fitted
Table 10. RS485 related solder bridges
8.6.3 microSD card
The 8-GB (or more) microSD card connected to SPI1 port (shared with color LCD) of
STM32G081RBT6 is available on the board. microSD card detection is managed by
standard IO port PC9 and it must be set with internal pull-up.
8.6.4 Analog Input
The two-pin header CN17 and 10K ohm potentiometer RV3 was connected to PB2 of
STM32G081RBT6 as analog input. A low pass filter can be implemented by replacing of
R111 and C90 with right value of resistor and capacitor as requested by end user's
application.
8.6.5 External I2C Connector
The I2C1 bus of the STM32G081RBT6 is connected to CN2 on the STM32G081B-EVAL.
The I2C functional daughterboard can be mounted on the CN2 connector and accessed by
the microcontroller through the I2C1 bus, it shares same I2C1 bus with Temperature sensor
U3 and DDC on HDMI_Source connector CN3 on legacy peripheral daughterboard.
The pull up voltage level of I2C1 bus is automatically decided by the daughterboard (the
legacy peripheral daughterboard or the UCPD daughterboard) on CN4 and CN5. If there is
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Hardware layout and configurationUM2403
no daughterboard on these connector, pin17 must be closed to pin18 on both CN4 and CN5
by jumpers. Thus I2C pull up voltage and reset pull up voltage on CN2 would be the voltage
of VDD.
8.6.6 Motor Control
The STM32G081B-EVAL Evaluation board supports both asynchronous and synchronous
three-phase brushless motor control via a 34-pins connector CN1, which provides all
required control and feedback signals to and from motor power-driving board.
Available signals on this connector includes emergency stop, motor speed, 3 phase motor
current, bus voltage, power heatsink coming from the motor driving board and 6 channels of
PWM control signal going to the motor driving circuit.
Daughterboard on CN4 and CN5 must be removed and some jumpers set for motor control
application:
•Close JP1, JP2 and JP3.
•Open JP4 and JP6.
•Open pin2-3 of JP8 and JP10.
8.6.7 Display and Input devices
The 2.4" color TFT LCD connected to SPI1 port of STM32G081RBT6 and 4 general
purpose color LED's (LD 1,2,3,4) are available as display device. The 4-direction joystick
(B3) with selection key which connected to PA0 and supports wakeup feature. Tamper
button (B2) are also available as input devices.
Note:The bi-directional voltage translator is implemented on SPI MOSI signal between
STM32G081RBT6 and LCD to support 3-wires serial interface of LCD panel only supports
3-wire SPI port. The direction of this voltage translator is controlled by IO PC12 (the IO PA7
is working as MOSI when PC12 is high or as MISO when PC12 is LOW).
24/78UM2403 Rev 1
UM2403Hardware layout and configuration
8.7 Peripherals on legacy peripheral daughterboard
8.7.1 LDR (Light dependent resistor)
The VDD is divided by resistor bridge of LDR VT9ON1 and 8.2 K resistor and connected to
PA1 (COM1_IN+/ADC IN1) as shown
Figure 9 on STM32G081B-EVAL Evaluation board.
Figure 9. GP comparator 1
It's possible to compare LDR output with ¼ band gap, 1/2 band gap, 3/4 band gap, band
gap and DAC1 OUT and to connect LDR output to ADC IN1 for AD conversion.
8.7.2 Temperature sensor
A temperature sensor STLM75M2F is connected to the I2C1 bus of the STM32G081RBT6,
and shares same I2C1 bus with EXT I2C connector (on mother board) and DDC on
HDMI_Source connector CN3 (on legacy board).
I2C address of temperature sensor is 0b100100(A0), A0 can be 0 or 1 depends on the
setting of SB7.
Solder BridgeDescription
SB7
Note:The temperature result measured from STLM75M2F would be a little higher than the
ambient temperature due to the power dissipation of components on the board.
Table 12. Temperature sensor related solder bridge
I2C address A0 is 0 when SB7 is open.
(Default setting)
I2C address A0 is 1 when SB7 is closed.
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8.7.3 Smartcard
STMicroelectronics smartcard interface chip ST8024L is used on STM32G081B-EVAL
Evaluation board for asynchronous 1.8V, 3V and 5V smartcards. It performs all supply
protection and control functions based on the connections with STM32G081RBT6 listed in
Tab le 13.
Table 13. Connection between ST8024L and STM32G081RBT6
Signals of
ST8024L
5V/3VSmartcard power supply selection pinPB15
I/OUCMCU data I/O linePA2
XTAL1Crystal or external clock inputPD4
OFFDetect card presence, Interrupt to MCUPB12
Two HDMI connectors CN1 and CN3 are available on STM32G081B-EVAL legacy
peripheral daughterboard.
•The connector CN1 is HDMI sink connector with
–DDC connected to I2C2 of STM32G081RBT6
–HPD controlled by IO PD2 through transistor T1
–CEC connected to PB10 through transistor T4
•The connector CN3 is HDMI source connector with
–DDC connected to I2C1 of STM32G081RBT6 and shared with Temperature
sensor and EXT I2C connector
–HPD controlled by IO PD3
–CEC connected to PB10 through transistor T4
–HDMI 5V powered by power switch U1
Description
CC operation selection. Logic high selects 1.8 V
1.8 V V
operation and overrides any setting on the 5V/3V pin.
Connect to
STM32G081RBT6
PA3
The signals TDMS D+[0..2], TDMS_CLK+, TDMS D-[0..2], TDMS_CLK- on these two HDMI
connectors are connected together.
The CEC injector mode can be enabled by some PCB reworks for debugging purpose only:
•Remove resistors R3, R4, R7, R9, R10, R15 and R22.
•Close solder bridges SB3, SB4, SB5 and SB6.
Note:The I/O PD2 must be set in open-drain output mode by firmware when working as an HPD
signal control on the HDMI sink connector CN1.
26/78UM2403 Rev 1
UM2403Hardware layout and configuration
8.7.5 IR LED and IR receiver
The IR receiver TSOP34836 is connected to PC6 of STM32G081RBT6 and a current
around 100mA on IR LED is driven by PB9 through transistors T2 and T3 on the board.
Note:IR LED may be driven by PB9 directly with 20mA current when SB1 is closed and SB2 is
open.
8.8 USB Type-C and Power Delivery daughterboard
The UCPD daughterboard is a development platform composed of STM32G081B-EVAL
Evaluation board. This daughterboard is used for demonstrating the functionalities of the
USB Type-C and USB Power Delivery (USB PD) technologies, facilitating the users to
develop their solutions. Refer to
Note:The USB PD reference design on the UCPD daughterboard is used to demonstrate the
capability of STM32G081RBT6. This USB PD circuit may not pass all USB PD certifications.
Note:The UCPD daughterboard works with VDD=3.3V. So JP16 pin1-2 must be closed on mother
board.
Note:The UCPD daughterboard conflicts with legacy peripheral daughterboard and Motor control
on STM32G081B-EVAL Evaluation board.
Figure 3 for daughterboard structure.
8.8.1 USB Type-C receptacles
Two USB Type-C certified receptacles CN7 and CN5 are present on the UCPD
daughterboard, representing respectively the PORT 1 and PORT 2. PORT 1 can be used as
DRP (Dual-Role Port), which is eligible to supply another platform plugged by a USB
Type-C cable when they are configured as Provider or, otherwise, to be supplied in case of
Consumer configuration. PORT 2 can only be used as SINK.
Video signals on display port input connector (CN6) and data signals on USB3.1 Gen1
Type-B connector (CN4) are multiplexed on Type-C PORT 1 thanks to a crosspoint switch
IC TUSB546-DCI. These signals on CN6 or on CN4 have to be generated by an external
computer or notebook to evaluate the alternate mode (AM) capability of the USB PD
technology. The crosspoint switch can be configured through I2C bus, and its I2C address is
0b1000100. The cable which is plugged into CN4 can be detected by PA15.
Same as Type-C PORT1, video signals on display port output connector (CN2) are
connected to Type-C PORT 2 through another crosspoint switch IC CBTL08GP053 and
DisplayPort Linear Redriver IC SN65DP141. I2C address of CBTL08GP053 is 0b0110000
and SN65DP141's default I2C address is 0b0000000. A Type-A receptacle's (CN1) D+ and
D- signals are also connected to Type-C PORT 2 directly. Its VBUS can be set by JP3 in
Tab le 14.
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Hardware layout and configurationUM2403
Table 14. VBUS related jumpers
JumperDescription
VBUS is connected to VCONN when JP3 is set as shown on the right (default setting).
JP3
VBUS is connected to D5V through mother board when JP3 is set as shown on the right.
Note:Some week USB charger can not provide power to board immediately from port1 Type-C
receptacle when external 19V power adapter is plugged off. If board lose power and reset
during such use case, close JP6 may help to solve this problem. JP6 is open by default.
8.8.2 Power Delivery and local power management
The UCPD daughterboard has its own external power jack (CN3, 19V/4A input) to support
power delivery function and to provide up to 15V/3A on Type-C port1 (CN7).
The STM32G081B-EVAL Evaluation board can be powered by D5V from the UCPD
daughterboard as shown in
by three resources, 19V from external power jack, VBUS on Port 1 and VBUS on Port 2. A
circuit is implemented on the UCPD daughterboard to automatically select external 19V
power supply or VBUS on Port1, because external 19V and VBUS on Port1 are the two
power sources for Port1 to D5V. A jumper JP5 is used to select D5V resources in
Table 15. Local power related jumpers
Figure 5. D5V on the UCPD daughterboard can be generated
Tab le 15.
JumperDescription
D5V from the UCPD daughterboard is generated from external 19V or VBUS on Port1 when JP5
is set as shown on the right (default setting).
JP5
D5V from the UCPD daughterboard is generated from VBUS on Port2 when JP5 is set as shown
on the right.
8.8.3 VBUS management and discharge mechanism
Type-C port1 (CN7) can be used as DRP (Dual-Role Port), its VBUS can be managed for
supplying other platforms as Provider, or to be supplied as Consumer. Two MOSFETs T6
and T7 are set in back-to-back configuration to protect and isolate the VBUS supplying path
on both directions.
If the CN7 acts as Provider, the VBUS is on the supply path by mean of the discrete load
switch (T6 and T7) driven by the STM32G081RBT6 (GPIO, PD3). For the Consumer case,
the same VBUS path is managed by PD3 of STM32G081RBT6 enabling the discrete load
switch.
All power profiles are listed in Tab le 16.
28/78UM2403 Rev 1
UM2403Hardware layout and configuration
CN7 role
Provider
Consumer-
Table 16. VBUS Power Delivery profiles
Solder bridges
setting
SB2, SB3, SB23,
SB26 ON
SB13, SB14, SB15
OFF
SB13, SB14, SB15
ON
SB2, SB3, SB23,
SB26 OFF
Power level
PWM Mode:
PWM voltage-3A
GPIO Mode:
5V / 9V / 15V- 3A
Decided by Provider
which is connected
through Type-C cable
Source
control
signal
PD3 HighPC1-PWM signal
PD3 High
PD3 low-
Voltage control signal
5V: PC1(VSOURCE9V) and
PA1(VSOURCE-15V)
tristate
9V: PC1(VSOURCE9V) low
15V: PA1 (VSOURCE15V) low
Moreover, the VBUS path on PORT1 presents a discharge mechanism implemented by the
MOSFET T8 and an RC filter and controlled by PB13, and the VBUS path on PORT2
presents a discharge mechanism implemented by the MOSFET T9 and an RC filter and
controlled by PB14.
8.8.4 VBUS voltage-sensing and current-sense stage
Each Type-C port is equipped by a voltage-sensing and a current-sensing stage which are
matched with the voltage sensing carried by the STM32G081RBT6 ADC peripherals. Refer
to
Table 17 for detail. They are able to monitor the right power level applied on the port
VBUS.
PORTVSENSE ADCISENSE ADC
PORT 1PB1ADC_IN9PB10ADC_IN11
PORT 2PA3ADC_IN3PB12ADC_IN16
Table 17. Voltage-sensing and current-sensing ADC
8.8.5 CC management
Dead battery, VCONN output and fast role swap functions are supported on CC signal of
Type-C PORT 1.
1.Dead battery enable
Dead battery function is supported by OVP chip U17 and U16. And this function also
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Hardware layout and configurationUM2403
embedded in STM32G081RBT6. When OVP part U17 is bypassed, dead battery
function in STM32G081RBT6 can be enable or disable through enable signals by set
JP2 (CC1) or JP1 (CC2). Refer to
JumperDescription
Embed dead battery function is enable when JP1 is set as shown on the right (default setting).
Table 18. Dead battery related jumpers
Tabl e 18 for detail.
JP1
JP2
Embed dead battery function is disable when JP1 is set as shown on the right.
Embed dead battery function is enable when JP2 is set as shown on the right (default setting).
Embed dead battery function is disable when JP2 is set as shown on the right.
2. VCONN output control
When the full-featured cable is connected to PORT 1, the VCONN is directly managed by
the STM32G081RBT6 by mean of the PD4 or PB9 and the load switches STMPS2161 U10
and U14.
3. Fast role swap
Type-C PORT 1 can be configure to action fast role swap managed by STM32G081RBT6
through PA2 (CC1) and PB0 (CC2).
30/78UM2403 Rev 1
UM2403Connectors
06Y9
9 Connectors
9.1 Connectors on mother board
9.1.1 Motor control connector CN1
Figure 10. Motor Control connector CN1 (top view)
Description
Emergency STOP PB1212-GND
PWM-UHPA834-GND
PWM-ULPD256-GND
PWM-VHPA978-GND
PWM-VLPD3910-GND
PWM-WHPA101112-GND
PWM-WLPD41314PA1BUS VOLTAGE
PHASE A
CURRENT
PHASE B
CURRENT
PHASE C
CURRENT
NTC BYPASS
RELAY
DISSIPATIVE
BRAKE PWM
STM32G081RBT6
PA21516GN D
PA61718GN D
PB101920-GND
PB92122-GND
PB152324-GND
Table 19. Motor control connector CN1
Pin of
Pin
number of
CN1
Pin
number of
CN1
Pin of
STM32G081RBT6
Description
+5V power-2526PA3
PFC SYNC2PD0
PFC SYNC1PC1
PFC PWMPB12930-GND
27283.3V power
UM2403 Rev 131/78
Heatsink
temperature
77
ConnectorsUM2403
069
Table 19. Motor control connector CN1 (continued)
Description
Encoder APC63132-GND
Encoder BPB53334PB0Encoder Index
Pin of
STM32G081RBT6
Pin
number of
CN1
Pin
number of
CN1
Pin of
STM32G081RBT6
Description
9.1.2 External I2C connector CN2
Figure 11. I2C EXT connector CN2 (front view)
Table 20. RF E2PROM connector CN2
Pin numberDescriptionPin numberDescription
1I2C1_SDA (PB7)5
2NC6NC
3I2C1_SCL (PB6)7GND
4EX_RESET(PC0)8NC
9.1.3 Daughterboard connector CN4 and CN5
Two 18-pins male headers CN4 and CN5 are designed to connect with the legacy peripheral
daughterboard or the UCPD daughterboard to STM32G081B-EVAL Evaluation mother
board. All GPI/Os are available on CN4, CN5 and extension connector CN9, CN10.
Each pin on CN4 and CN5 can be used by a daughterboard after disconnecting it from the
corresponding function block on STM32G081B-EVAL Evaluation board. Please refer to
Tab le 21 and Tab l e 22 for detail.
PWR (Define by daughterboard
on CN5, or VDD when short CN5
pin17 and pin18)
32/78UM2403 Rev 1
UM2403Connectors
Pin Signal
Mother board
Table 21. Daughterboard connector CN4
Legacy
Function
daughterboard
Function (CN5)
daughterboard
Function (CN9)
UCPD
How to disconnect with
function block on mother
board
1PA1MC_BusVoltageLDR_OUTV_CTL2Keep JP1 open
2PA15-Smartcard RSTUSB3_DET-
3PB6I2C1_SCLI2C1_SCLI2C1_SCL-
4PB7I2C1_SDAI2C1_SDAI2C1_SDA-
5GND----
6RESET#----
7PC6MC_ENAIR_IN
Display port
HPD_SOURCE
-
8PB13-I2C2_SCLDISCHARGE 1-
9PB14-I2C2_SDADISCHARGE 2-
10PB1MC_PFCpwm-VSENSE 1-
11PB10MC_CurrentCHDMI_CECISENSE 1-
12PA3MC_heatsinkTempSmartcard 1V8VSENSE 2Keep JP2 open
13PB12
MC_EmergencyST
OP
Smartcard OFFISENSE 2Keep JP3 open
14+3V3----
Daughterboard
detection & USB
PD output VSENSE
-
15PB11
Daughterboard
detection
Daughterboard
detection
16VDD_ANA----
17I2C_PU
I2C pull up power
of CN2
---
18VDD----
Pin Signal
Mother board
Table 22. Daughterboard connector CN5
Legacy
Function
daughterboard
Function (CN4)
daughterboard
Function (CN8)
UCPD
How to disconnect with
function block on mother
board
1PA8MC_UH-PORT1_CC1-
2PB15
3PA9
4PA10
MC_Dissipative
brake
MC_VH/USART1_
TX_BOOT
MC_WH/USART1_
RX_BOOT
Smartcard 3/5 VPORT1_CC2-
-PORT1_DB1Keep JP10 pin2-3 open
-PORT1_DB2Keep JP8 pin2-3 open
5GND----
6PD4MC_WLSmartcard CKVCONN_EN1-
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ConnectorsUM2403
Table 22. Daughterboard connector CN5 (continued)
Pin Signal
7PB9MC_NTCIR_OUTVCONN_EN2-
8PA2MC_Current ASmartcard TXFRS_TX1-
9PB0MC_ENINDEX
10+5V----
11PB5MC_ENBTemp Sensor INT
12PC1MC_PFCsync1-V_CTL1-
13PD0MC_PFCsync2-PORT2_CC1-
14PD2MC_ULHDMI_ HPD_SINK PORT2_CC2-
15PD3MC_VL
16D5V----
EXT I2C
17
PWR
18VDD----
Mother board
Function
Power of CN25VVDD-
Legacy
daughterboard
Function (CN4)
Smartcard
CMDVCC
HDMI_
HPD_SOURCE
UCPD
daughterboard
Function (CN8)
FRS_TX2-
Display port
HPD_IN
SOURCE_EN-
How to disconnect with
function block on mother
board
-
9.1.4 ST-LINK/V2-1 USB Micro-B connector CN6
The USB Micro-B connector CN6 is used to connect embedded ST-LINK/V2-1 to PC for
debugging of board.
Figure 12. USB Micro-B connector CN6 (front view)
Pin numberDescriptionPin numberDescription
1VBUS (power)4ID
2DM5GND
3DP--
Table 23. USB Micro-B connector CN6
34/78UM2403 Rev 1
UM2403Connectors
9.1.5 ST-LINK/V2-1 programming connector CN7
The connector CN7 is used only for embedded ST-LINK/V2-1 programming during board
manufacturing. It is not populated by default and not for end user.
9.1.6 microSD connector CN8
Figure 13. microSD connector CN8 (front view)
Pin numberDescription
1NC5MicroSDcard_CLK (PB3)
2MicroSDcard_CS (PD1)6Vss/GND
3MicroSDcard_DIN(PA7)7MicroSDcard_DOUT(PB4)
4+3V38NC
--10MicroSDcard_detect (PC9)
Table 24. microSD connector CN9
9.1.7 Extension connector CN9 and CN10
Two 22-pin male headers CN9 and CN10 can be used to connect with daughterboard or
standard wrapping board to STM32G081B-EVAL Evaluation board. The standard width
between CN9 pin1 and CN10 pin1 is 2700mils (68.58mm). The standard was implemented
on the majority of Evaluation boards.
Each pin on CN9 and CN10 can be used by a daughterboard after disconnecting it from the
corresponding function block on STM32G081B-EVAL Evaluation board. Please refer to
Two female connectors CN4 and CN5 are used to implement the legacy peripheral
daughterboard on the mother board. CN4 on legacy daughterboard is connected to CN5 on
mother board, and CN5 on legacy daughterboard is connected to CN4 on mother board.
Please refer to
Section 9.1.3 for detail signal definition of these connectors.
Figure 28. USB Type-C connector PORT1 CN7 (front view)
Pin numberDescriptionPin numberDescription
A1GNDB1GND
A2TX1+B2TX2+
A3TX1-B3TX2-
A4VBUSB4VBUS
A5CC1 (PA8)B5CC2 (PB15)
A6D+B6D+
A7D-B7D-
A8SBU1B8SBU2
A9VBUSB9VBUS
A10RX2-B10RX1-
A11RX2+B11RX1+
A12GNDB12GND
Table 39. USB Type-C connector PORT1 CN7
9.3.8 Daughterboard female connector CN8 and CN9
Two female connectors CN8 and CN9 are used to implement the UCPD daughterboard on
mother board. CN8 on UCPD the daughterboard is connected to CN5 on the mother board,
and CN9 on the UCPD daughterboard is connected to CN4 on the mother board. Please
refer to
Section 9.1.3 for detail signal definition of these connectors.
46/78UM2403 Rev 1
UM2403Electrical schematics
Appendix A Electrical schematics
This chapter provides design schematics for the STM32G081B-EVAL key features to help
users to implement these features in application designs:
•Figure 29: STM32G081B-EVAL mother board top on page 48
•Figure 30: STM32G081B-EVAL MCU on page 49
•Figure 31: STM32G081B-EVAL power on page 50
•Figure 32: STM32G081B-EVAL audio on page 51
•Figure 33: STM32G081B-EVAL LCD microSD on page 52
•Figure 34: STM32G081B-EVAL motor-control on page 53
•Figure 35: STM32G081B-EVAL peripherals on page 54
•Figure 36: STM32G081B-EVAL RS232 and RS485 on page 55
•Figure 37: STM32G081B-EVAL extension connectors on page 56
•Figure 38: STM32G081B-EVAL ST-LINK V2-1 on page 57
•Figure 39: STM32G081B-EVAL SWD on page 58
•Figure 40: STM32G081B-EVAL legacy peripheral daughterboard on page 59
•Figure 41: STM32G081B-EVAL legacy peripheral daughterboard HDMI and CEC on
page 60
•Figure 42: STM32G081B-EVAL legacy peripheral daughterboard Smartcard and IR on
page 61
•Figure 43: STM32G081B-EVAL legacy peripheral daughterboard temperature sensor
and LDR on page 62
•Figure 44: STM32G081B-EVAL UCPD daughterboard top on page 63
•Figure 45: STM32G081B-EVAL UCPD daughterboard CC and VCONN on page 64
UM2403Federal Communications Commission (FCC) and Industry Canada (IC) Compliance State-
Appendix C Federal Communications Commission (FCC)
and
Industry Canada (IC) Compliance Statements
C.1 FCC Compliance Statement
C.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.
C.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.
C.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.
C.2 IC Compliance Statement
C.2.1 Compliance Statement
Industry Canada ICES-003 Compliance Label: CAN ICES-3 (A)/NMB-3(A).
C.3 Déclaration de conformité
Étiquette de conformité à la NMB-003 d'Industrie Canada: CAN ICES-3 (A)/NMB-3(A).
UM2403 Rev 175/78
77
Mechanical dimensionsUM2403
Appendix D Mechanical dimensions
Figure 53. Mechanical dimensions
SymbolSize (mm)SymbolSize (mm)SymbolSize (mm)
A68.58e77.44P2111.76
A161.97H11P310.41
a2.54Lx5.715Q124.12
B36Ly5.715Q217.70
D3.5Mx19.08Q316
d3.2My23.81X114.3
E47P165.78Y172.72
76/78UM2403 Rev 1
Table 41. Mechanical dimensions
UM2403Revision history
Revision history
Table 42. Document revision history
DateRevisionChanges
7-Nov-20181Initial version
UM2403 Rev 177/78
77
UM2403
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