STMicroelectronics Discovery kit for STM32L151/152 line - with STM32L152RC MCU STM32L152C-DISCO STM32L152C-DISCO Hoja De Datos

DocID022799 Rev 6

The STM32L15xxC embeds 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

The STM32L15xxC embeds 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 (V

REFINT

) 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).

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 
V

REFINT

. 

The STM32L15xxC 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