STM32G47PBY3XXX datasheet(31/229 Pages) STMICROELECTRONICS

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Functional overview

3.18.2

Internal voltage reference (VREFINT)

The internal voltage reference (VREFINT) provides a stable (bandgap) voltage output for

the ADC and the comparators. The VREFINT is internally connected to the ADCx_IN18,

x = 1,3,4,5 input channel. The precise voltage of VREFINT is individually measured for each

part by ST during production test and stored in the system memory area. It is accessible in

read-only mode.

3.18.3

VBAT battery voltage monitoring

This embedded hardware enables the application to measure the VBAT battery voltage using

the internal ADC1_IN17 channel. As the VBAT voltage may be higher than the VDDA, and

thus outside the ADC input range, the VBAT pin is internally connected to a bridge divider by

3. As a consequence, the converted digital value is one third of the VBAT voltage.

3.18.4

Operational amplifier internal output (OPAMPxINT):

The OPAMPx (x = 1...6) output OPAMPxINT can be sampled using an ADCx (x = 1...5)

internal input channel. In this case, the I/O on which the OPAMPx output is mapped can be

used as GPIO.

3.19

Digital to analog converter (DAC)

Seven 12 bit DAC channels (3 external buffered and 4 internal unbuffered) can be used to

convert digital signals into analog voltage signal outputs. The chosen design structure is

composed of integrated resistor strings and an amplifier in inverting configuration.

Table 5. Temperature sensor calibration values

Calibration value name

Description

Memory address

TS_CAL1

TS ADC raw data acquired at a

temperature of 30 °C (± 5 °C),

VDDA = VREF+ = 3.0 V (± 10 mV)

0x1FFF 75A8 - 0x1FFF 75A9

TS_CAL2

TS ADC raw data acquired at a

temperature of 110 °C (± 5 °C),

VDDA = VREF+ = 3.0 V (± 10 mV)

0x1FFF 75CA - 0x1FFF 75CB

Table 6. Internal voltage reference calibration values

Calibration value name

Description

Memory address

VREFINT

Raw data acquired at a

temperature of 30 °C (± 5 °C),

VDDA = VREF+ = 3.0 V (± 10 mV)

0x1FFF 75AA - 0x1FFF 75AB

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