STM32G0C1NET3 datasheet(26/159 Pages) STMICROELECTRONICS

26 / 159 page

Functional overview

STM32G0C1xC/xE

26/159

DS13564 Rev 4

3.14.2

Internal voltage reference (VREFINT)

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

ADC and comparators. VREFINT is internally connected to an ADC input. The VREFINT

voltage is individually precisely measured for each part by ST during production test and

stored in the part’s engineering bytes. It is accessible in read-only mode.

3.14.3

VBAT battery voltage monitoring

This embedded hardware feature allows the application to measure the VBAT battery voltage

using an internal ADC input. As the VBAT voltage may be higher than VDDA and thus outside

the ADC input range, the VBAT pin is internally connected to a bridge divider by three. As a

consequence, the converted digital value is one third the VBAT voltage.

3.15

Digital-to-analog converter (DAC)

The 2-channel 12-bit buffered DAC converts a digital value into an analog voltage available

on the channel output. The architecture of either channel is based on integrated resistor

string and an inverting amplifier. The digital circuitry is common for both channels.

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 130 °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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