Operating Voltage; Smartcard; High-Brightness Led; Limitations - ST STM32G474E-EVAL User Manual

Hardware layout and configuration
5.24.1

Operating voltage

The temperature-sensor operating voltage is in the range of 2.25 to 3.60 V.
5.25

Smartcard

STMicroelectronics smartcard interface chip ST8024L is used on the STM32G474E-EVAL
Evaluation board for asynchronous 1.8, 3.0, and 5.0 V smartcards. It performs all supply
protection and control functions based on the connections with STM32G474QET6 listed in
Table 23.
Signals of
ST8024L
5 V / 3 V
I/OUC
XTAL1
OFF
RSTIN
CMDVCC
1.8V
5.25.1 Operating voltage
The smartcard operating voltage is in the range of 2.7 to 3.6 V.
5.26

High-brightness LED

An Everluck company high-brightness LED LE-CWC12100 and its power control circuits
with the inverted buck topology are on the STM32G474E-EVAL board. The brightness can
be adjusted by the PWM signal from STM32G474QET6 through PC8. The current on the
LED can be monitored by the STM32G474QET6, thanks to the voltage measured on PB11,
which corresponds to the current through R177 (1 Ω). Refer to
configuration.
5.26.1

Limitations

The high-brightness LED is exclusive to OpAmp4/ Comp6 and MC operation.
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Table 23. Connection between ST8024L and STM32F091VCT6

Smartcard power-supply selection pin
MCU data I/O line
Crystal or external clock input
Detect the presence of a card
Card reset input from MCU
Start activation sequence input (active LOW)
1.8 V V operation selection. Logic high selects 1.8 V
CC
operation and overrides any setting on the 5 V / 3 V pin.
UM2514 Rev 5
Description
, with an interrupt to the MCU
UM2514
Connect to
STM32G474E-
EVAL
MFX_GPIO9
PC10
PC12
MFX_GPIO10
MFX_GPIO12
MFX_GPIO11
MFX_GPIO8
Table 16 for the PB11