STM32WBA62CG datasheet(51/185 Pages) STMICROELECTRONICS

51 / 185 page

DS14736 Rev 1

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STM32WBA6xxx

Functional overview

The reference voltage can be one of the following:

•

internal reference voltage or sub-multiple (1/4, 1/2, 3/4).

•

external reference voltage on GPIO in function COMPx_INM.

All comparators can wake up from Stop 0 and Stop 1 modes, generate interrupts and breaks

for the timers and can also be combined into a window comparator.

3.23

Touch sensing controller (TSC)

The TSC (touch sensing controller) provides a simple solution to add capacitive sensing

functionality to any application. A capacitive sensing technology is able to detect finger

presence near an electrode that is protected from direct touch by a dielectric (glass, plastic

or other). 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 TSC is fully supported by the STMTouch touch sensing firmware library that is free to

use and allows touch sensing functionality to be implemented reliably in the end application.

The TSC main features are the following:

•

Proven and robust surface charge transfer acquisition principle

•

Support of up to 24 capacitive sensing channels

•

Up to eight 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 packages and subject to

I/O availability.

3.24

True random number generator (RNG)

The RNG is a true random number generator that provides full entropy outputs to the

application as 32-bit samples. It is composed of a live entropy source (analog) and an

internal conditioning component.

The RNG is a NIST SP 800-90B compliant entropy source that can be used to construct a

nondeterministic random bit generator (NDRBG).

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