Analog Input, Output, Vref; Analog Input; Analog Output; Vref+ Terminal - ST STM32G474E-EVAL User Manual

Hardware layout and configuration
based 32-bit MCUs (RM0440), in the Calibration section of the Operational amplifiers
(OPAMP) chapter. Such a procedure is already implemented in the STM32CubeG4 MCU
Package.
Parts impacted
This applies only to the MB1397-based boards within the following range of serial numbers:
MB1397-G474E: A191000001-A191000170
MB1397-G474EMC: A191000001- A191000100
MB1397-G484E: A191000001-A191000030
Other issues
The OpAmp4 is exclusive to high-brightness LED and MC operation.
The Comp6 is exclusive to high-brightness LED and MC operation.
5.17

Analog input, output, VREF

5.17.1

Analog input

STM32G474QET6 provides an on-board differential analog-to-digital converter, differential
ADC. The PA0 and PA1 ports can be configured to operate as a differential ADC input,
which is routed to the CN7 and CN8 SMB connectors or the CN3 SMB connector via a
single-ended differential circuit. The default setting is the analog input signal from the CN3
SMB connector.
Parameters of the ADC input low-pass filter formed with R310/C171 and R152/C35 can be
modified by replacing these components according to application requirements.
5.17.2

Analog output

STM32G474QET6 provides an on-board digital-to-analog converter, DAC. The port PA4
can be configured to operate as DAC output. PA4 is routed to the two-way CN9 header to
fetch signals from PA4 to ground it by fitting a jumper into CN9.
Parameters of the DAC output low-pass filter formed with R153 and C36 can be modified by
replacing these components according to application requirements.
5.17.3

VREF+ terminal

The VREF+ terminal of STM32G474QET6 is used as the reference voltage for both ADC
and DAC. It is routed to VDDA or VREF_EXT through the solder bridges configuration
shown in
VREF_EXT is a high resolution of voltage reference from U53 TL1431ACL5T.
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Table 18.
UM2514 Rev 5
UM2514