ST STM32U575I-EV, Руководство пользователя, Страница: 50 / 105

Table 34 describes the U31 smartcard interface and CN31 connector pinout.
Table 34. U31 smartcard interface and CN31 connector pinout
Pin
U21
transceiver
Board function
C1 17 VCC Smartcard power supply
C2 16 RST Smartcard reset
C3 15 CLK Smartcard clock
C4 13 AUX1 Smartcard auxiliary I/O 1
C5 14 GND GND
C6 - NC
C7 11 I/O Smartcard I/O
C8 12 AUX2 Smartcard auxiliary I/O 2
S1 GND GND: used for smartcard detection
S2 9 PRESN Smartcard detection active low level
7.17.4 I/O restriction to other features
Caution: Due to the sharing of some I/Os of STM32U575AII6Q by multiple peripherals, the following limitations apply in
using the smartcard features:
•
The smartcard USART3_TX cannot be operated simultaneously with the LCD with the TE feature.
• The smartcard USART3_CK cannot be operated simultaneously with the Octo
‑
SPI with CLKN (1.8 V
configuration).
• The smartcard USART3_CK cannot be operated simultaneously with the motor control.
7.18 User LEDs
7.18.1 Description
Four general-purpose colored LEDs (LD5, LD6, LD7, and LD8) are available as light indicators. Each LED is in
light
‑
emitting state when a low level is applied to the corresponding I/O ports.
The LD5 green and LD6 red user LEDs are directly connected to STM32U575AII6Q.
The LD7 blue and LD8 yellow user LEDs are connected to the I/O
‑
expander.
7.18.2 Operating voltage
As the LEDs are driven by the I/O low level, they are compatible with VDD_MCU 1.8 V. The voltage isolation is
done with an NPN transistor.
STM32U575I-EV
User LEDs
UM2854 - Rev 1
page 50/105