STM32G071C8 datasheet(17/133 Pages) STMICROELECTRONICS

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DS12232 Rev 3

17/133

STM32G071x8/xB

Functional overview

•

VDDA = 1.62 V (ADC and COMP) / 1.8 V (DAC) / 2.4 V (VREFBUF) to 3.6 V

VDDA is the analog power supply for the A/D converter, D/A converter, voltage

reference buffer and comparators. VDDA voltage level is identical to VDD voltage as it is

provided externally through VDD/VDDA pin.

•

VDDIO1 = VDD

VDDIO1 is the power supply for the I/Os. VDDIO1 voltage level is identical to VDD voltage

as it is provided externally through VDD/VDDA pin.

•

VBAT = 1.55 V to 3.6 V. VBAT is the power supply (through a power switch) for RTC,

TAMP, low-speed external 32.768 kHz oscillator and backup registers when VDD is not

present. VBAT is provided externally through VBAT pin. When this pin is not available

on the package, VBAT bonding pad is internally bonded to the VDD/VDDA pin.

•

VREF+ is the analog peripheral input reference voltage, or the output of the internal

voltage reference buffer (when enabled). When VDDA < 2 V, VREF+ must be equal to

VDDA. When VDDA ≥ 2 V, VREF+ must be between 2 V and VDDA. It can be grounded

when the analog peripherals using VREF+ are not active.

The internal voltage reference buffer supports two output voltages, which is configured

with VRS bit of the VREFBUF_CSR register:

–VREF+ around 2.048 V (requiring VDDA equal to or higher than 2.4 V)

–VREF+ around 2.5 V (requiring VDDA equal to or higher than 2.8 V)

VREF+ is delivered through VREF+ pin. On packages without VREF+ pin, VREF+ is

internally connected with VDD, and the internal voltage reference buffer must be kept

disabled (refer to datasheets for package pinout description).

•

VCORE

An embedded linear voltage regulator is used to supply the VCORE internal digital

power. VCORE is the power supply for digital peripherals, SRAM and Flash memory.

The Flash memory is also supplied with VDD.

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