Idd Measurement; Table 20. Idd Measurement-Related Jumper Setting - ST STM32L4R9I User Manual

Hardware layout and configuration
Pin number
of MFX
20
26
27
28
29
30
31
32
33
39
40
6.28

IDD measurement

STM32L4R9AII6 has a built-in circuit to measure its current consumption (IDD) in Run and
Low-power modes, except for Shutdown mode. It is strongly recommended that the MCU
supply voltage (VDD_MCU line) does not exceed 3.3 V. This is because there are
components on STM32L4R9I-EVAL supplied from 3.3 V that communicate with the MCU
through I/O ports. Voltage exceeding 3.3 V on the MCU output port might inject current into
3.3 V-supplied peripheral I/Os and false the MCU current consumption measurement.
Table 20
board.
s
Jumper
JP4
44/77
Table 19. MFX signals (continued)
Pin name
MFX functions
of MFX
PB2 MFX_GPIO2
PB13 MFX_GPIO13
PB14 MFX_GPIO14
PB15 MFX_GPIO15
PA8 MFX_GPIO8
PA9 MFX_GPIO9
PA10 MFX_GPIO10
PA11 MFX_GPIO11
PA12 MFX_GPIO12
PB3 MFX_GPIO3
PB4 MFX_GPIO4
shows the setting of jumpers associated with the IDD measurement on the main

Table 20. IDD measurement-related jumper setting

Setting
1 2 3
1 2 3
Function of
STM32L4R9AII6
JOY_LEFT
-
-
-
EXT_RESET
DSI_RST
-
LCD_DISP
LCD_RST
JOY_RIGHT
JOY_UP
Default setting: STM32L4R9AII6 has a built-in circuit allowing to
measure its current consumption.
IDD measurement is not available, Bypass mode only for
STM32L4R9AII6 VDD_MCU power supply.
UM2248 Rev 5
Direction
(for MFX)
Input
-
-
-
Output
Output
-
Output
Output
Input
Input
Configuration
UM2248
Terminal
device
Joystick
-
-
-
EXT_I2C
DSI LCD
-
TFT LCD
TFT LCD
Joystick
Joystick