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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.
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 2
page 40/61