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