STM32F058C8 datasheet(18/104 Pages) STMICROELECTRONICS

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Functional overview

STM32F058C8 STM32F058R8 STM32F058T8

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DocID023402 Rev 3

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 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:

•

Left or right data alignment in 12-bit mode

•

Synchronized update capability

•

DMA capability

•

External triggers for conversion

Five 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 21: 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 STM32F058C8/R8/T8 devices provide a simple solution for adding capacitive sensing

functionality to any application. These devices offer up to 17 capacitive sensing channels

distributed over 6 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

introduced by the finger (or any conductive object) is measured using a proven

implementation based on a surface charge transfer acquisition principle. It consists in

charging the sensor capacitance and then transferring a part of the accumulated charges

into a sampling capacitor until the voltage across this capacitor has reached a specific

threshold. To limit the CPU bandwidth usage, this acquisition is directly managed by the

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