STM32WB15CC datasheet(40/127 Pages) STMICROELECTRONICS

40 / 127 page

Functional overview

STM32WB15CC

40/127

DS13258 Rev 4

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



Proven and robust surface charge transfer acquisition principle



Supports up to three 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 upon the package and subject to

I/O availability.

3.17

True random number generator (RNG)

The device embeds a true RNG that delivers 32-bit random numbers generated by an

integrated analog circuit.

3.18

Timers and watchdogs

The STM32WB15CC includes one advanced 16-bit timer, one general-purpose 32-bit timer,

two low-power timers, two watchdog timers and a SysTick timer. Table 12 compares the

features of the advanced control, general purpose and basic timers.

3.18.1

Advanced-control timer (TIM1)

The advanced-control timer can be seen as a three-phase PWM multiplexed on six

channels. They have complementary PWM outputs with programmable inserted



Table 12. Timer features

Timer

type

Timer

Counter

resolution

Counter

type

Prescaler

factor

DMA

request

generation

Capture/

compare

channels

Complementary

outputs

Advanced

control

TIM1

16-bits

Up, down,

Up/down

Any integer

between 1

and 65536

Yes

General

purpose

TIM2

32-bits

Up, down,

Up/down

4No

Low power

LPTIM1

LPTIM2

16-bits

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