STM32L432KB datasheet(33/149 Pages) STMICROELECTRONICS

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STM32L432KB STM3L432KC

Functional overview

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

•

Proven and robust surface charge transfer acquisition principle

•

Supports up to 3 capacitive sensing channels

•

Up to 3 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 3 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.

3.20

Random number generator (RNG)

All devices embed an RNG that delivers 32-bit random numbers generated by an integrated

analog circuit.

3.21

Timers and watchdogs

The STM32L432xx includes one advanced control timers, up to five general-purpose timers,

two basic timers, two low-power timers, two watchdog timers and a SysTick timer. The table

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

Table 8. Timer feature comparison

Timer type

Timer

Counter

resolution

Counter

type

Prescaler

factor

DMA

request

generation

Capture/

compare

channels

Complementary

outputs

Advanced

control

TIM1

16-bit

Up, down,

Up/down

Any integer

between 1

and 65536

Yes

General-

purpose

TIM2

32-bit

Up, down,

Up/down

Any integer

between 1

and 65536

Yes

General-

purpose

TIM15

16-bit

Any integer

between 1

and 65536

Yes

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