STM32U073RCT6 datasheet(19/146 Pages) STMICROELECTRONICS

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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.

Table 5. 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 6E68 - 0x1FFF 6E69

TS_CAL2

TS ADC raw data acquired at a

temperature of 130 °C (± 5 °C),

VDDA = VREF+ = 3.0 V (± 10 mV)

0x1FFF 6E8A - 0x1FFF 6E8B

3.16.2

Internal voltage reference (VREFINT)

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

comparators. 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.

Table 6. 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 6EA4 - 0x1FFF 6EA5

3.16.3

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.

3.17

Digital-to-analog converter (DAC)

The single-channel 12-bit buffered DAC converts a digital value into an analog voltage available on the channel

output. The architecture of either channel is based on integrated resistor string and an inverting amplifier.

Features of the DAC:

•

One DAC output channel

•

8-bit or 12-bit output mode

•

Buffer offset calibration (factory and user trimming)

•

Left or right data alignment in 12-bit mode

•

Synchronized update capability

•

Noise-wave generation

•

Triangular-wave generation

•

DMA capability

•

Triggering with timer events, synchronized with DMA

•

Triggering with external events

•

Sample-and-hold low-power mode, with internal or external capacitor

STM32U073x8/B/C

Functional overview

DS14548 - Rev 2

page 19/146

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