STM32L072X8 datasheet(30/147 Pages) STMICROELECTRONICS

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Functional overview

STM32L072xx

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DocID027100 Rev 3

3.14

Ultra-low-power comparators and reference voltage

The STM32L072xx embed two comparators sharing the same current bias and reference

voltage. The reference voltage can be internal or external (coming from an I/O).



One comparator with ultra low consumption



One comparator with rail-to-rail inputs, fast or slow mode.



The threshold can be one of the following:

–

DAC output

–

External I/O pins

–

Internal reference voltage (VREFINT)

–

submultiple of Internal reference voltage(1/4, 1/2, 3/4) for the rail to rail

comparator.

Both comparators can wake up the devices from Stop mode, and be combined into a

window comparator.

The internal reference voltage is available externally via a low-power / low-current output

buffer (driving current capability of 1 µA typical).

3.15

Touch sensing controller (TSC)

The STM32L072xx provide a simple solution for adding capacitive sensing functionality to

any application. These devices offer up to 24 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 (such as 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 of

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

hardware touch sensing controller and only requires few external components to operate.

The touch sensing controller is fully supported by the STMTouch touch sensing firmware

library, which is free to use and allows touch sensing functionality to be implemented reliably

in the end application.

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