STM32L15XCC datasheet(27/136 Pages) STMICROELECTRONICS

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STM32L151xC STM32L152xC

Functional overview

3.12

Operational amplifier

The STM32L151xC and STM32L152xC devices embed two operational amplifiers with

external or internal follower routing capability (or even amplifier and filter capability with

external components). When one operational amplifier is selected, one external ADC

channel is used to enable output measurement.

The operational amplifiers feature:

•

Low input bias current

•

Low offset voltage

•

Low-power mode

•

Rail-to-rail input

3.13

Ultra-low-power comparators and reference voltage

The STM32L151xC and STM32L152xC devices embed two comparators sharing the same

current bias and reference voltage. The reference voltage can be internal or external

(coming from an I/O).

•

One comparator with fixed threshold

•

One comparator with rail-to-rail inputs, fast or slow mode. The threshold can be one of

the following:

–

DAC output

–

External I/O

–

Internal reference voltage (VREFINT) or a sub-multiple (1/4, 1/2, 3/4)

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).

3.14

System configuration controller and routing interface

The system configuration controller provides the capability to remap some alternate

functions on different I/O ports.

The highly flexible routing interface allows the application firmware to control the routing of

different I/Os to the TIM2, TIM3 and TIM4 timer input captures. It also controls the routing of

internal analog signals to ADC1, COMP1 and COMP2 and the internal reference voltage

VREFINT.

3.15

Touch sensing

The STM32L151xC and STM32L152xC devices provide a simple solution for adding

capacitive sensing functionality to any application. These devices offer up to 23 capacitive

sensing channels distributed over 10 analog I/O groups. Both software and timer capacitive

sensing acquisition modes are 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

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