STM32L432KB datasheet(32/149 Pages) STMICROELECTRONICS

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Functional overview

STM32L432KB STM3L432KC

32/149

DocID028798 Rev 2

3.17

Comparators (COMP)

The STM32L432xx devices embed two rail-to-rail 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 channels

•

Internal reference voltage or submultiple (1/4, 1/2, 3/4).

All comparators can wake up from Stop mode, generate interrupts and breaks for the timers

and can be also combined into a window comparator.

3.18

Operational amplifier (OPAMP)

The STM32L432xx embeds one operational amplifier with external or internal follower

routing and PGA capability.

The operational amplifier features:

•

Low input bias current

•

Low offset voltage

•

Low-power mode

•

Rail-to-rail input

3.19

Touch sensing controller (TSC)

The touch sensing controller provides a simple solution for adding capacitive sensing

functionality to any application. Capacitive sensing technology is able to detect finger

presence near an electrode 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.

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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