STM32G0 datasheet(27/135 Pages) STMICROELECTRONICS

27 / 135 page

DS12232 Rev 4

27/135

STM32G071x8/xB

Functional overview

3.16

Voltage reference buffer (VREFBUF)

3.17

Comparators (COMP)

Two embedded rail-to-rail analog comparators have programmable reference voltage

(internal or external), hysteresis, speed (low for low-power) and output polarity.

The reference voltage can be one of the following:

•

external, from an I/O

•

internal, from DAC

•

internal reference voltage (VREFINT) or its submultiple (1/4, 1/2, 3/4)

The comparators can wake up the device from Stop mode, generate interrupts, breaks or

triggers for the timers and can be also combined into a window comparator.

3.18

Timers and watchdogs

The device includes an advanced-control timer, six general-purpose timers, two basic

timers, two low-power timers, two watchdog timers and a SysTick timer. Table 7 compares

features of the advanced-control, general-purpose and basic timers.

When enabled, an embedded buffer provides the internal reference voltage to analog

blocks (for example ADC) and to VREF+ pin for external components.

The internal voltage reference buffer supports two voltages:

•

2.048 V

•

2.5 V

An external voltage reference can be provided through the VREF+ pin when the internal

voltage reference buffer is disabled.

On some packages, the VREF+ pad of the silicon die is double-bonded with supply pad to

common VDD/VDDA pin and so the internal voltage reference buffer cannot be used.

Table 7. Timer feature comparison

Timer type

Timer

Counter

resolution

Counter

type

Maximum

operating

frequency

Prescaler

factor

DMA

request

generation

Capture/

compare

channels

Comple-

mentary

outputs

Advanced-

control

TIM1

16-bit

Up, down,

up/down

128 MHz

Integer from

1 to 216

Yes

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