STM32G070CB datasheet(22/93 Pages) STMICROELECTRONICS

22 / 93 page

Functional overview

STM32G070CB/KB/RB

22/93

DS12766 Rev 2

3.14.1

Temperature sensor

The temperature sensor (TS) generates a voltage VTS that varies linearly with temperature.

The temperature sensor is internally connected to an ADC input to convert the sensor

output voltage into a digital value.

The sensor provides good linearity but it has to be calibrated to obtain good overall

accuracy of the temperature measurement. As the offset of the temperature sensor may

vary from part to part due to process variation, the uncalibrated internal temperature sensor

is suitable only for relative temperature measurements.

To improve the accuracy of the temperature sensor, each part is individually factory-

calibrated by ST. The resulting calibration data are stored in the part’s engineering bytes,

accessible in read-only mode.

3.14.2

Internal voltage reference (VREFINT)

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

ADC. 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

Timers and watchdogs

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

timers, two low-power timers, two watchdog timers and a SysTick timer. Table 6 compares

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

Table 4. 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

Table 5. 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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