STM32G0 datasheet(26/135 Pages) STMICROELECTRONICS

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Functional overview

STM32G071x8/xB

26/135

DS12232 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.

Features of the DAC:

•

Two DAC output channels

•

8-bit or 12-bit output mode

•

Buffer offset calibration (factory and user trimming)

•

Left or right data alignment in 12-bit mode

•

Synchronized update capability

•

Noise-wave generation

•

Triangular-wave generation

•

Independent or simultaneous conversion for DAC channels

•

DMA capability for either DAC channel

•

Triggering with timer events, synchronized with DMA

•

Triggering with external events

•

Sample-and-hold low-power mode, with internal or external capacitor

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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