STM32L471RG datasheet(38/218 Pages) STMICROELECTRONICS

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Functional overview

STM32L471xx

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DocID027226 Rev 1

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.

3.15.2

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 the ADC1_IN0 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.

3.15.3

VBAT battery voltage monitoring

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

using the internal ADC channel ADC1_IN18 or ADC3_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 3. As a consequence, the converted digital value is one

third the VBAT voltage.

3.16

Digital to analog converter (DAC)

Two 12-bit buffered DAC channels can be used to convert digital signals into analog voltage

signal outputs. The chosen design structure is composed of integrated resistor strings and

an amplifier in inverting configuration.

This digital interface supports the following features:

•

Up to two DAC output channels

•

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

Table 8. 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

TS_CAL2

TS ADC raw data acquired at a

temperature of 110 °C (± 5 °C),

VDDA = VREF+ = 3.0 V (± 10 mV)

0x1FFF 75CA - 0x1FFF 75CB

Table 9. 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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