STM32L162VC datasheet(26/123 Pages) STMICROELECTRONICS

26 / 123 page

Functional overview

STM32L162VC, STM32L162RC

26/123

DocID022881 Rev 10

3.12

Operational amplifier

The STM32L162xC 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 STM32L162xC 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 STM32L162xC 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

introduced by the finger (or any conductive object) is measured using a proven

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