Pin
number
Description Pin connection
Pin
number
Description Pin connection
20 NC NC 25 NC NC
21 NC NC 24 NC NC
22 NC NC 23 GPIO4 GND
7.13 MFX (Multi-function expander)
7.13.1 Description
The MFX circuit on the STM32H7B3I-EVAL Evaluation board acts as an I/O expander. The communication
interface between MFX and STM32H7B3LIH6QU is the I2C2 bus.
I2C2 (PH4/PH5) is shared between EXT I
2
C module CN24, MB1486 Wi‑Fi
®
module U24, MFX I/O expander U25,
audio codec U48, MB1379 camera module CN2, and MB1370 LCD touch panel CN30.
The signals connected to MFX are listed in Table 45.
Table 45. MFX signals
Pin
number
of MFX
Pin
name of
MFX
MFX functions
Function of STM32H7B3I-
EVAL
Direction (For MFX) Terminal device
18 PB0 MFX_GPIO0 3V3_SW_ENABLE Output PWR
19 PB1 MFX_GPIO1 WIFI_GPIO Output WIFI
20 PB2 MFX_GPIO2 WIFI_DATRDY Output WIFI
39 PB3 MFX_GPIO3 Audio_RST Output Codec
40 PB4 MFX_GPIO4 Camera_PLUG_IN Input Camera
15 PA5 MFX_GPIO5 Camera_RSTI Input Camera
16 PA6 MFX_GPIO6 Camera_XSDN Input Camera
17 PA7 MFX_GPIO7 USB_OTG_FS_PWR_EN Output USB FS
29 PA8 MFX_GPIO8 1V8_SW_ENABLE Output PWR
30 PA9 MFX_GPIO9 FDCAN_STBY Output CAN FD
31 PA10 MFX_GPIO10 WIFI_WKUP Output WIFI
32 PA11 MFX_GPIO11 LED2 Output LED
33 PA12 MFX_GPIO12 LED3 Output LED
26 PB13 MFX_GPIO13 LED4 Output LED
27 PB14 MFX_GPIO14 WIFI_BOOT Output WIFI
28 PB15 MFX_GPIO15 WIFI_RST Output WIFI
3 PC14 MFX_GPO4 USB_OTG_HS_PWR_EN Output USB HS
5 PH0 MFX_GPO5 USB_HS_PHY_RESET Output USB HS
6
(1)
PH1 MFX_GPO6 EXT_RESET / MOTOR_GPIO1 Output / Output I2C EXT / MOTOR
38 PA15 MFX_GPO7 MOTOR_GPIO2 Output MOTOR
1. This pin is shared between different functions and requires a hardware configuration (Such as jumpers and solder bridges).
7.13.2 Operating voltage
STM32H7B3LIH6QU MFX interface (GPIO, I
2
C) can only be at 3.3 V on this board.
UM2662
MFX (Multi-function expander)
UM2662 - Rev 1
page 48/95
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