STM32F078CB datasheet(19/120 Pages) STMICROELECTRONICS

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STM32F078CB, STM32F078RB, STM32F078VB

Functional overview

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 25: Embedded

internal reference voltage

for the value and precision of the internal reference voltage.

Both comparators can wake up from STOP mode, generate interrupts and breaks for the

timers and can be also combined into a window comparator.

3.13

Touch sensing controller (TSC)

The STM32F078CB/RB/VB devices provide a simple solution for adding capacitive sensing

functionality to any application. These devices offer up to 23 capacitive sensing channels

distributed over 8 analog I/O groups.

Capacitive sensing technology is able to detect the presence of a finger near a sensor which

is protected from direct touch by a dielectric (glass, plastic...). The capacitive variation

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