ST STM32U575I-EV, Руководство пользователя, Страница: 52 / 105

7.19.3 Physical input I/O interface
Table 36 describes the hardware configuration for the physical user interface.
Table 36. Hardware I/O configuration for the physical user interface
I/O Hardware Setting
(1)
Configuration
PA1
SB78 / JP35
[1-2]
PA1 is connected to the B3 tamper key button as a passive tamper
function (active HIGH).
[2-3] PA1 is connected to the PC13 tamper I/O as an active tamper function
OFF
PA1 is NOT connected to the tamper key.
PA1 can be used for STMod+ or motor control.
PC13 JP35
[1-2]
PC13 is connected to the B4 user button (active HIGH)
[2-3]
PC13 is connected to the PA13 tamper key as an active tamper function.
B4 is always connected to PC13 through R125.
R125 is OFF to isolate B4 from PC13.
NRST - - Reset button source (active LOW)
MFX_IO0 - - JOY_SEL: Joystick selection connected to B1 pin 2
MFX_IO1 - - JOY_DOWN: Joystick down direction connected to B1 pin 3
MFX_IO2 - - JOY_LEFT: Joystick left direction connected to B1 pin 1
MFX_IO3 - - JOY_RIGHT: Joystick right direction connected to B1 pin6
MFX_IO4 - - JOY_UP: Joystick up direction connected to B1 pin4
1. The default configuration is shown in bold.
7.19.4 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 physical interface features:
•
The passive tamper key function cannot be operated simultaneously with the active tamper, the
STMOD+_INT or the motor
‑
control functions. The user button function cannot be operated simultaneously
with the active tamper function.
7.20 Operational amplifiers and comparator
7.20.1 Description
The STM32U575I-EV Evaluation board offers the possibility to test the internal operational amplifiers and
comparators according to:
•
RV1 10 kΩ potentiometer
• R33 LDR light
‑
dependent resistor
The potentiometer and light-dependent resistor can be mutually exclusively routed to either PB4 (Comp) or PA0
(OpAmp) port of STM32U575AII6Q.
7.20.2 Operating voltage
The operational amplifiers and comparator are connected to VDD or are referenced to GND. So the operational
amplifiers and comparator are compatible with the VDD_MCU voltage range from 1.71 to 3.6 V.
7.20.3 Operational amplifiers
STM32U575AII6Q provides two onboard operational amplifiers. One of which, OpAmp1, is made accessible on
STM32U575I-EV. OpAmp1 has its inputs and its output routed to I/O ports.
STM32U575I-EV
Operational amplifiers and comparator
UM2854 - Rev 1
page 52/105