STM32U545NET3QTR datasheet(60/283 Pages) STMICROELECTRONICS

60 / 283 page

Functional overview

STM32U545xx

60/283

DS14216 Rev 1

3.25.3

Temperature sensor

The temperature sensor generates a voltage VSENSE that varies linearly with temperature.

The temperature sensor is internally connected to ADC1 and ADC4 input channel that is

used to convert the sensor output voltage into a digital value.

The sensor provides good linearity but it must be calibrated to obtain a good 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 STMicroelectronics in the system memory area, accessible in read-only mode.

3.25.4

Internal voltage reference (VREFINT)

The VREFINT provides a stable (bandgap) voltage output for the ADC and the comparators.

The VREFINT is internally connected to ADC1 and ADC4 input channels.

The precise voltage of VREFINT is individually measured for each part by

STMicroelectronics during production test and stored in the system memory area. It is

accessible in read-only mode.

3.25.5

VBAT battery voltage monitoring

This embedded hardware enables the application to measure the VBAT battery voltage using

ADC1 or ADC4 input channel. As the VBAT voltage may be higher than the VDDA, and thus

outside the ADC input range, the VBAT pin is internally connected to a bridge divider by

four. As a consequence, the converted digital value is a quarter of the VBAT voltage.

Table 16. Temperature sensor calibration values

Calibration

value name

Description

Memory address

TS_CAL1

Temperature sensor 14-bit raw data acquired by ADC1

at 30 °C (± 5 °C), VDDA = VREF+ = 3.0 V (± 10 mV)

0x0BFA 0710 - 0x0BFA 0711

TS_CAL2

Temperature sensor 14-bit raw data acquired by ADC1

at 130 °C (± 5 °C), VDDA = VREF+ = 3.0 V (± 10 mV)

0x0BFA 0742 - 0x0BFA 0743

Table 17. Internal voltage reference calibration values

Calibration value name

Description

Memory address

VREFINT_CAL

14-bit raw data acquired by ADC1

at 30 °C (± 5 °C), VDDA = VREF+ = 3.0 V (± 10 mV)

0x0BFA 07A5 - 0x0BFA 07A6

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