ST STM32L4P5AG, User Manual

Page: 15 / 37

6.13 MFX MCU
The MFX MCU is used as an MFX multi-function expander and an IDD measurement calculator.
6.13.1 MFX
The MFX circuit on the STM32L4P5G-DK Discovery kit acts as IO-expander. The communication interface
between MFX and STM32L4P5AGI6PU is the I2C1 bus. The signals connected to MFX are listed in
Table 6 .
Table 6. MFX signals
MFX pin
number
MFX pin
name
MFX function STM32L4P5G-DK function MFX direction Terminal device
15 PA5 MFX_GPIO5 Camera_Flash Output Camera
16 PA6 MFX_GPIO6 Camera_STANDBY Output Camera
17 PA7 MFX_GPIO7 Camera_PLUG Input Camera
18 PB0 MFX_GPIO0 USB_PSON Output USB OTG FS
19 PB1 MFX_GPIO1 USB_OVRCR Input USB OTG FS
20 PB2 MFX_GPIO2 Audio_RST Input Audio
26 PB13 MFX_GPIO13 - - -
27 PB14 MFX_GPIO14 - - -
28 PB15 MFX_GPIO15 - - -
29 PA8 MFX_GPIO8 - - -
30 PA9 MFX_GPIO9 - - -
31 PA10 MFX_GPIO10 - - -
32 PA11 MFX_GPIO11 - - -
33 PA12 MFX_GPIO12 - - -
39 PB3 MFX_GPIO3 Camera_RST Output Camera
40 PB4 MFX_GPIO4 Camera_Shutter Output Camera
6.13.2 IDD measurement
STM32L4P5AGI6PU has a built-in circuit to measure its own current consumption (IDD) in Run and Low-power
modes, except Shutdown mode. It is strongly recommended for the MCU supply voltage (VDD_MCU line) to not
exceed 3.3 V because there are components on the STM32L4P5G-DK supplied from 3.3 V that communicate
with the MCU through I/O ports. Voltage exceeding 3.3 V on the MCU output port may inject current into 3.3 V
supplied peripheral I/Os and distort the MCU current-consumption measurement.
Table 7 shows the setting of the jumper associated with the IDD measurement on the board.
Table 7. IDD measurement related jumper setting
HW
Setting
(1) Configuration
JP5
JP5 [1-2]
STM32L4P5AGI6PU has a built-in circuit to measure its own current
consumption.
JP5 [2-3]
IDD measurement is not available, bypass mode only for STM32L4P5AGI6PU
VDD_MCU power supply.
1. The default configuration is shown in bold.
UM2651
MFX MCU
UM2651 - Rev 2
page 15/37