STM32WB55CC datasheet(44/165 Pages) STMICROELECTRONICS

44 / 165 page

Functional overview

STM32WB55xx

44/165

DS11929 Rev 3

package, hence the internal voltage reference buffer is not available on a dedicated pin, but

user can still use the VDDA value.

3.16

Comparators (COMP)

The STM32WB55xx 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

•

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.

3.17

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 such as

glass or 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 (free to use) and enables reliable touch sensing functionality in the end application.

The main features of the touch sensing controller are the following:

•

Proven and robust surface charge transfer acquisition principle

•

Supports up to 28 capacitive sensing channels

•

Up to three capacitive sensing channels can be acquired in parallel offering a very

good response time

•

Spread spectrum feature to improve system robustness in noisy environments

•

Full hardware management of the charge transfer acquisition sequence

•

Programmable charge transfer frequency

•

Programmable sampling capacitor I/O pin

•

Programmable channel I/O pin

•

Programmable max count value to avoid long acquisition when a channel is faulty

•

Dedicated end of acquisition and max count error flags with interrupt capability

•

One sampling capacitor for up to three capacitive sensing channels to reduce the

system components

•

Compatible with proximity, touchkey, linear and rotary touch sensor implementation

•

Designed to operate with STMTouch touch sensing firmware library

Note:

The number of capacitive sensing channels is dependent on the size of the packages and

subject to I/O availability.

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