Table 41. 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 I/O expander
Supplied by 3V3.
The communication interface between MFX and
STM32MP157FAA1 is an I
2
C bus and IRQOUT pin.
The I
2
C is I2C2 that is shared with all the peripherals: audio codec, DSI LCD, RGB LTDC, camera, and USB Hub.
The MFX I
2
C address is 0x42h.
Table 42. HW configuration for the MFX interface
I/O 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 43. I/O 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 smartcard 3 V 5 V selection
17 GPIO7 SMARTCARD_OFF MB1262/U5 smartcard OFF
29 GPIO8 SMARTCARD_RST MB1262/U5 smartcard 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
28 GPIO15 - -
UM2648
MFX MCU
UM2648 - Rev 1
page 37/61
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