Smartcard; Hdmi Cec; Table 15. Connection Between St8024L And Stm32G081Rbt6 - STMicroelectronics STM32G081B-EVAL User Manual

UM2403
6.7.3

Smartcard

STMicroelectronics smartcard interface chip ST8024L is used on STM32G081B-EVAL
Evaluation board for asynchronous 1.8V, 3V and 5V smartcards. It performs all supply
protection and control functions based on the connections with STM32G081RBT6 listed in
Table 15.
Signals of
ST8024L
5V/3V
I/OUC
XTAL1
OFF
RSTIN
CMDVCC
1.8V
Smartcard operates correctly when VDD > 2.7 V.
6.7.4

HDMI CEC

Two HDMI connectors CN1 and CN3 are available on STM32G081B-EVAL legacy
peripheral daughterboard.
• The connector CN1 is HDMI sink connector with
–
–
–
•
The connector CN3 is HDMI source connector with
–
–
–
–
The signals TDMS D+[0..2], TDMS_CLK+, TDMS D-[0..2], TDMS_CLK- on these two HDMI
connectors are connected together.
The CEC injector mode can be enabled by some PCB reworks for debugging purpose only:
•
Remove resistors R3, R4, R7, R9, R10, R15 and R22.
•
Close solder bridges SB3, SB4, SB5 and SB6.
Note: The I/O PD2 must be set in open-drain output mode by firmware when working as an HPD
signal control on the HDMI sink connector CN1.

Table 15. Connection between ST8024L and STM32G081RBT6

Smartcard power supply selection pin
MCU data I/O line
Crystal or external clock input
Detect card presence
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 5V/3V pin.
DDC connected to I2C2 of STM32G081RBT6
HPD controlled by IO PD2 through transistor T1
CEC connected to PB10 through transistor T4
DDC connected to I2C1 of STM32G081RBT6 and shared with Temperature
sensor and EXT I2C connector
HPD controlled by IO PD3
CEC connected to PB10 through transistor T4
HDMI 5V powered by power switch U1
Description
, Interrupt to MCU
UM2403 Rev 2
Hardware layout and configuration
STM32G081RBT6
PB15
PA2
PD4
PB12
PA15
PB0
PA3
Connect to
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