Table 45. MB1262/CN21 connector pinout
STM32 pin Board function Pin Pin Board function STM32 pin
- 3V3 1 2 5V -
PA12 I2C5_SDA 3 4 5V -
PA11 I2C5_SCL 5 6 GND -
PI11 MCO1 7 8 USART3_TX PB10
- GND 9 10 USART3_RX PB12
PG8 USART3_RTS 11 12 SAI2_SCKA PI5
PD7 SDMMC3_D3 13 14 GND GND
PG15 SDMMC3_CK 15 16 SDMMC3_CMD PF1
- 3V3 17 18 SDMMC3_D0 PF0
PZ2 SPI1_MOSI 19 20 GND GND
PZ1 SPI1_MISO 21 22 SDMMC3_D1 PF4
PZ0 SPI1_SCK 23 24 SPI1_NSS PZ3
- GND 25 26 GPIO -
PH5 I2C2_SDA 27 28 I2C2_SCL PH4
PG2 MCO2 29 30 GND -
PA3 TIM2_CH4 31 32 TIM12_CH1 PH6
PI2 TIM8_CH4 33 34 GND -
PI7 SAI2_FSA 35 36 USART3_CTS PI10
PF5 SDMMC3_D2 37 38 SAI2_SDA PI6
- GND 39 40 SAI2_SDB PF11
SAI2 on the GPIO connector supports PCM signals. SAI2 is shared between the audio codec and this GPIO
expansion connector
. By default, SAI2 is connected to the audio codec. I2C5 is connected by default to the
I2C_EXT connector.
The following HW board modifications are needed to enable SAI2 and I2C5 on the GPIO expansion connector, as
described in Table 46.
Table 46. HW configurations to enable SAI2 on the GPIO connector
STM32
pin
Board function Board modifications to enable SAI2 on the GPIO connector
PI5 SAI2_SCKA Open MB1262/SB9 and SB67. Close MB1262/SB66
PI7 SAI2_FSA Open MB1262/SB11 and SB65. Close MB1262/SB63
PI6 SAI2_SDA Open MB1262/SB10 and SB75. Close MB1262/SB73
PF11 SAI2_SDB Open MB1262/SB8 and SB70. Close MB1262/SB69
PA12 I2C5_SDA Open MB1262/SB54. Close MB1262/SB55
PA11 I2C5_SCL Open MB1262/SB51. Close MB1262/SB52
6.29 RGB LTDC connector
A 2×30-pin RGB LTDC connector is implemented on MB1262/CN11.
UM2648
RGB LTDC connector
UM2648 - Rev 1
page 40/61
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