STM32F031X4 datasheet(16/106 Pages) STMICROELECTRONICS

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Functional overview

STM32F031x4 STM32F031x6

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DocID025743 Rev 4

An analog watchdog feature allows very precise monitoring of the converted voltage of one,

some or all selected channels. An interrupt is generated when the converted voltage is

outside the programmed thresholds.

3.10.1

Temperature sensor

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

temperature.

The temperature sensor is internally connected to the ADC_IN16 input channel which is

used 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 varies

from chip to chip due to process variation, the uncalibrated internal temperature sensor is

suitable for applications that detect temperature changes only.

To improve the accuracy of the temperature sensor measurement, each device is

individually factory-calibrated by ST. The temperature sensor factory calibration data are

stored by ST in the system memory area, accessible in read-only mode.

3.10.2

Internal voltage reference (VREFINT)

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

ADC. VREFINT is internally connected to the ADC_IN17 input channel. The precise voltage

of VREFINT is individually measured for each part by ST during production test and stored in

the system memory area. It is accessible in read-only mode.

3.10.3

VBAT battery voltage monitoring

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

using the internal ADC channel ADC_IN18. 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 2. As a consequence, the converted digital value is half the VBAT voltage.

Table 3. 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= 3.3 V (± 10 mV)

0x1FFF F7B8 - 0x1FFF F7B9

TS_CAL2

TS ADC raw data acquired at a

temperature of 110 °C (

± 5 °C),

VDDA= 3.3 V (± 10 mV)

0x1FFF F7C2 - 0x1FFF F7C3

Table 4. Internal voltage reference calibration values

Calibration value name

Description

Memory address

VREFINT_CAL

Raw data acquired at a

temperature of 30 °C (

± 5 °C),

VDDA= 3.3 V (± 10 mV)

0x1FFF F7BA - 0x1FFF F7BB

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