STM32MP135x-DK - hardware description - alpha

This article provides an overview of the STM32MP135x-DK Warning.png Discovery kits.

1 Article purpose[edit]

This article briefly describes:

  • what are the different components on the board
  • how to connect the board to external material
  • how to configure the board for boot
  • what are the configurations of the connector pins

This article is valid for the STM32MP135F-DK Warning.png and STM32MP135D-DK Warning.png Discovery kits: the part numbers are specified in the STM32MP13 microprocessor part numbers article.



2 Board assembly[edit]

This article explains how to assemble the STM32MP135x-DK Discovery kit. It is valid for the STM32MP135F-DK Discovery kit: the part numbers are specified in the STM32MP13 microprocessor part numbers article.

Warning white.png Warning
To start the board successfully, it is recommended to go through the corresponding Starter Package article: Category:Starter Package

The STM32MP135F-DK Discovery kit Warning.png delivery is composed of the items listed below.

Position Description
1 MB1635 mother board
2 MB1723 camera module
3 Camera module flat cable
4 microSD™ card


Note that the STM32MP135F-DK Discovery kit Warning.png delivery does not contain a USB cable or a USB charger.


STM32MP135F-DK Discovery kit assembled.
(picture is not contractual)





3 Board overview[edit]

Position Description Position Description
1 MB1635 mother board 4 (CN8) GPIO expansion
5 (B1) User button (USER1) 6 (B2) User button (USER2)
7 (LD3) User LED (blue)[LEDs 1] 8 (LD4) User LED (red)[LEDs 1]
9 (U35) 4.3" LCD 10 (CN9) Reserved
11 (CN10) USB Micro-B (STLINK-V3E) 12 (LD5) STLINK-V3E LED (bicolor)[LEDs 2]
13 (CN11) Backup battery connector 14 (LD2) USB Type-A LED (red)[LEDs 3]
15 (LD1) Power LED (green) [LEDs 4] 16 (B3) Wake-up button
17 (B5) Reset button 18 (B4) Tamper button
19 (LD7) User LED (green) [LEDs 1] 20 (LD6) User LED (orange)[LEDs 1]
21 (SW1) Boot mode selection 22 (CN14) Power measurement connector
STM32MP135x-DK Discovery kit top view side
STM32MP135F-DK shown here (picture is not contractual)


Position Description Position Description
23 (U14) STM32MP135F 11x11 24 (U17) DDR3L 16 bits
25 (U19) PMIC (STPMIC1) 26 (U12) STLINK-V3E
27 (CN1 and U2) CSI connector and bridge 28 (U1) WLAN + Bluetooth© (muRata LBEE5KL1DX)
29 (U5) 8-bit I/O expander 30 (CN15 and U7) Ethernet 2
31 (CN3) microSD™ card connector 32 (CN4 and U13) Ethernet 1
33 (CN7 and U21) USB Type-C© (flashload & DRP) via STM32G0 34 (CN12) USB Type-C© (power 5V-3A)
35 (CN5, CN6 and U33) 2x dual USB Type-A (host)
STM32MP135x-DK Discovery kit bottom view
STM32MP135F-DK shown here (picture is not contractual)


Details about some LEDs:

  1. 1.01.11.21.3 LD3, LD4, LD6, LD7: some user LEDs are used to reflect the system activity, while the others are left free for use by the application, as explained in the LEDs and buttons on STM32 MPU boards article
  2. LD5: flashes red if the STLINK-V3E connection is not established, green otherwise
  3. LD2: turns red if a USB Type-A connection is established
  4. LD1: turns green if the power connection established

4 Board connection[edit]

The connections shown in the picture below are the ones recommended to start with the STM32MP135x_DK Discovery kits. As shown in the board overview, other connectors are available for these boards (for example CSI).



MB1635 mother board :STM32MP135F 11x11, PMIC, DDR3MB1723 camera moduleCamera module flat cablemicroSD™ card slotEthernet 2 → NetworkEthernet 1 → NetworkUSB Micro-B (STLINK-V3E) → PC Virtual COM port and debugUSB Type-C© (power 5V-3A)USB Type-C© (DRP)1st dual USB Type-A (host) → keyboard, mouse or USB driver2nd dual USB Type-A (host) → keyboard, mouse or USB driverReset button
STM32MP135F-DK Discovery kit connections. (picture is not contractual)




5 Boot related switches[edit]

The following table defines the different combination of the boot mode selection switches:

Boot modes
Boot mode Boot 0 Boot 1 Boot 2
Forced USB boot
for programming
0 0 0
Engineering boot 0 0 1
microSD™ card 1 0 1
Not supported Other codes
Info white.png Information
'0' is considered when switch is pushed in the OPEN position. It is ‘1’ otherwise.
boot switches position to program the board via the USB
Engineering boot
boot switches position to boot the board on microSD™ card

6 GPIO mapping[edit]

6.1 GPIO expansion connector[edit]

The pins of the GPIO expansion connector (CN8 on the board overview picture) are described in the following table:

GPIO expansion connector
Function STM32 pin Pin Pin STM32 pin Function
3V3 - 1 2 - 5V
GPIO2 / I2C5_SDA[EX 1] PH6 3 4 - 5V
GPIO3 / I2C5_SCL[EX 1] PD1 5 6 - GND
GPIO4 / TIM3_CH4 PB1 7 8 PC0 GPIO14 / USART1_TX
GND - 9 10 PB0 GPIO15 / USART1_RX
GPIO17 / USART1_RTS PC2 11 12 PA4 GPIO18 / SAI1_SCKA
GPIO27 / DFSDM1_CKOUT PC3 13 14 - GND
GPIO22 / DFSDM1_DATIN3 PF13 15 16 PG1 GPIO23 / FDCAN2_TX
3V3 - 17 18 PG3 GPIO24 / FDCAN2_RX
GPIO10 / SPI5_MOSI PH3 19 20 - GND
GPIO9 / SPI5_MISO PA8 21 22 PI0 GPIO25 / TAMP_IN8_OUT1
GPIO11 / SPI5_SCK PH7 23 24 PH11 GPIO8 / SPI5_NSS
GND - 25 26 PF10 GPIO7
I2C1_SDA[EX 2] PE8 27 28 PD12 I2C1_SCL[EX 2]
GPIO5 / MCO2 PE6 29 30 - GND
GPIO6 / TIM4_CH2 PD13 31 32 PE5 GPIO12 / TIM8_CH3
GPIO13 / TIM14_CH1 PF9 33 34 - GND
GPIO19 / SAI1_FSA PF11 35 36 PA7 GPIO16 / USART1_CTS
GPIO26 / UART8_TX PE1 37 38 PA5 GPIO20 / SAI1_SDA
GND - 39 40 PA0 GPIO21 / SAI1_SDB
  1. 1.01.1 Warning: the I2C5 is used to communicate with several on-board peripherals but is also available on the GPIO expansion connector. So, it is important to ensure that new components added on the I2C5 connection do not disturb the bus behavior.
  2. 2.02.1 Warning: the I2C1 is used to communicate with several on-board peripherals but is also available on the GPIO expansion connector. So, it is important to ensure that new components added on the I2C1 connection will not disturb the bus behavior.
Info white.png Information
No SDMMCx function is available on the GPIO expansion compared to the usual GPIO expansion connector.

6.2 User buttons and LEDs[edit]

The GPIO assignments for the user buttons and LEDs are described in the following table. Refer to the article LEDs and buttons on STM32 MPU boards to get information on the functional mapping for each one.

GPIO for user buttons and LEDs
LED color and label Button label GPIO
Green LD7 (*) - MCP_IO4
Red LD4 (*) USER2 (*) PA13
Orange LD6 - MCP_IO5
Blue LD3 USER1 (*) PA14
Warning white.png Warning
(*) Both a LED and a button are connected to the same GPIO, with inverted logic for the LED control (so that the LED is switched on when the GPIO output is set to low).