STM32L151VBT6DTR datasheet(26/121 Pages) STMICROELECTRONICS

26 / 121 page

Functional overview

STM32L151x6/8/B, STM32L152x6/8/B

26/121

Doc ID 17659 Rev 8

Both comparators can wake up from Stop mode, and be combined into a window

comparator.

The internal reference voltage is available externally via a low power / low current output

buffer (driving current capability of 1 µA typical).

3.13

Routing interface

This interface controls the internal routing of I/Os to TIM2, TIM3, TIM4 and to the

comparator and reference voltage output.

3.14

Touch sensing

The STM32L15xxx devices provide a simple solution for adding capacitive sensing

functionality to any application. These devices offer up to 20 capacitive sensing channels

distributed over 10 analog I/O groups. Only software capacitive sensing acquisition mode is

supported.

Capacitive sensing technology is able to detect the presence of a finger near a sensor 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. It consists of

charging the sensor capacitance and then transferring a part of the accumulated charges

into a sampling capacitor until the voltage across this capacitor has reached a specific

threshold. The capacitive sensing acquisition only requires few external components to

operate.

Reliable touch sensing functionality can be quickly and easily implemented using the free

STM32L1xx STMTouch touch sensing firmware library.

3.15

Timers and watchdogs

The ultra-low-power STM32L15xxx devices include six general-purpose timers, two basic

timers and two watchdog timers.

Table 8 compares the features of the general-purpose and basic timers.

Table 8.

Timer feature comparison

Timer

Counter

resolution

Counter

type

Prescaler

factor

DMA request

generation

Capture/compare

channels

Complementary

outputs

TIM2,

TIM3,

TIM4

16-bit

Up,

down,

up/down

Any integer

between 1

and 65536

Yes

TIM9

16-bit

Any integer

between 1

and 65536

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