STM32F091CB datasheet(19/127 Pages) STMICROELECTRONICS

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STM32F091xB STM32F091xC

Functional overview

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.

3.10.3

VBAT battery voltage monitoring

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

using the internal ADC channel ADC_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 2. As a consequence, the converted digital value is half the VBAT voltage.

3.11

Digital-to-analog converter (DAC)

The 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 non-inverting configuration.

This digital Interface supports the following features:

•

8-bit or 12-bit monotonic output

•

Left or right data alignment in 12-bit mode

•

Synchronized update capability

•

Noise-wave generation

•

Triangular-wave generation

•

Dual DAC channel independent or simultaneous conversions

•

DMA capability for each channel

•

External triggers for conversion

Six DAC trigger inputs are used in the device. The DAC is triggered through the timer trigger

outputs and the DAC interface is generating its own DMA requests.

3.12

Comparators (COMP)

The device embeds two fast rail-to-rail low-power comparators with programmable

reference voltage (internal or external), hysteresis and speed (low speed for low power) and

with selectable output polarity.

The reference voltage can be one of the following:

•

External I/O

•

DAC output pins

•

Internal reference voltage or submultiple (1/4, 1/2, 3/4).Refer to Table 28: Embedded

internal reference voltage for the value and precision of the internal reference voltage.

Table 4. Internal voltage reference calibration values

Calibration value name

Description

Memory address

VREFINT_CAL

Raw data acquired at a

temperature of 30 °C (

± 5 °C),

VDDA= 3.3 V (± 10 mV)

0x1FFF F7BA - 0x1FFF F7BB

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