Users Manual

Table 40. I2C_EXT connector pinout MB1262/CN13
Signal name Pin Pin Signal name
EXT_SDA 1 2 NC
EXT_SCL 3 4 EXT_RST
3V3 5 6 NC
GND 7 8 NC
6.26 MFX MCU
The MFX: Multi-Function eXpander MCU is used as a GPIO expander, in position MB1262/U20.
6.26.1 MFX IO expander
Supplied by 3V3.
The communication interface between MFX and STM32MP157xAA3 is I2C bus, and an IRQOUT pin.
The I2C is I2C2 that is shared with all the peripherals: Audio codec, DSI LCD, RGB LTDC, Camera, and USB
Hub.
The MFX I²C address is 0x42h.
Table 41. HW configuration for the MFX interface
IO SB Setting
Configuration
(1)
PI8 R127 ON MFX_IRQ_OUT is connected to PI8
PH5 R124 ON PH5 is used as I2C2_SDA
PH4 R125 ON PH4 is used as I2C2_SCL
PD10 - - SUB_NRST
1. Default configuration in bold
Table 42. IO signals driven by the MFX
Pin number Pin name Signal name Function
18 GPIO0 JOY_CENTER MB1262/B1 Joystick selection
19 GPIO1 JOY_DOWN MB1262/B1 Joystick down direction
20 GPIO2 JOY_LEFT MB1262/B1 Joystick left direction
39 GPIO3 JOY_RIGHT MB1262/B1 Joystick right direction
40 GPIO4 JOY_UP MB1262/B1 Joystick up direction
15 GPIO5 Audio_INT MB1262/U8 audio codec interrupt
16 GPIO6 SMARTCARD_3V/5V MB1262/U5 Smart card 3 V 5 V selection
17 GPIO7 SMARTCARD_OFF MB1262/U5 Smart Card OFF
29 GPIO8 SMARTCARD_RST MB1262/U5 Smart Card RESET
30 GPIO9 SMARTCARD_CMDVCC MB1262/U5 smartcard VCC command
31 GPIO10 MIC_MEMS_LED MB1262/CN8 pin12
32 GPIO11 - -
33 GPIO12 CAMERA_PLUG Camera plug detection
26 GPIO13 - -
27 GPIO14 LCD_INT DSI or LTDC interrupt
UM2535
MFX MCU
UM2535 - Rev 2
page 37/59