STM32L4R9ZIT6PTR datasheet(45/306 Pages) STMICROELECTRONICS

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STM32L4R5xx, STM32L4R7xx and STM32L4R9xx

Functional overview

3.19.2

Internal voltage reference (VREFINT)

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

the ADC and the comparators. The 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.

3.19.3

VBAT battery voltage monitoring

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

the internal ADC channel ADC1_IN18. 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 3. As a consequence, the converted digital value is one third of the VBAT voltage.

3.20

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

•

Noise-wave generation

•

Triangular-wave generation

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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