STM32WL55JC datasheet(41/145 Pages) STMICROELECTRONICS

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DS13293 Rev 1

41/145

STM32WL55/54xx

Functional overview

3.20.2

Internal voltage reference (VREFINT)

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

is internally connected to the ADC VIN[13] input channel.

VREFINT is individually and precisely measured, for each part, by ST, during production test

and stored in the device engineering bytes. It is accessible in read-only mode.

3.20.3

VBAT battery voltage monitoring

This embedded hardware feature allows the application to measure the VBAT(a) battery

voltage using the ADC VIN[14] input channel. As VBAT 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.

3.21

Digital-to-analog converter (DAC)

The 1-channel 12-bit buffered DAC converts a digital value into an analog voltage available

on the channel output. The architecture of each channel is based on an integrated resistor

string and an inverting amplifier. The digital circuitry is common for both channels.

DAC main features:

•

1 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

•

independent or simultaneous conversion for DAC channels

Table 12. Temperature sensor calibration values

Calibration value

name

Description

Memory address

TS_CAL1

TS ADC raw data acquired at 30 °C (± 5 °C),

VDDA = VREF+ = 3.3 V (± 10 mV)

0x1FFF 75A8 - 0x1FFF 75A9

TS_CAL2

TS ADC raw data acquired at 130 °C (± 5 °C),

VDDA = VREF+ = 3.3 V (± 10 mV)

0x1FFF 75C8 - 0x1FFF 75C9

Table 13. Internal voltage reference calibration values

Calibration value name

Description

Memory address

VREFINT_CAL

Raw data acquired at 30 °C (± 5 °C),

VDDA = VREF+ = 3.3 V (± 10 mV)

0x1FFF 75AA - 0x1FFF 75AB

a. VDD on STM32WL55/54UxYx devices.

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