STM32L031C6 datasheet(28/118 Pages) STMICROELECTRONICS

28 / 118 page

Functional overview

STM32L031x4/6

28/118

DocID027063 Rev 4

3.12

Ultra-low-power comparators and reference voltage

The STM32L031x4/6 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 ultra low consumption



One comparator with rail-to-rail inputs, fast or slow mode.



The threshold can be one of the following:

–

External I/O pins

–

Internal reference voltage (VREFINT)

–

submultiple of Internal reference voltage(1/4, 1/2, 3/4) for the rail to rail

comparator.

Both comparators can wake up the devices 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

System configuration controller

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, TIM21, TIM22 and LPTIM timer input captures. It also controls the

routing of internal analog signals to the ADC, COMP1 and COMP2 and the internal

reference voltage VREFINT.

3.14

Timers and watchdogs

The ultra-low-power STM32L031x4/6 devices include three general-purpose timers, one

low- power timer (LPTM), two watchdog timers and the SysTick timer.

Table 9 compares the features of the general-purpose and basic timers.

Table 9. Timer feature comparison

Timer

Counter

resolution

Counter type

Prescaler factor

DMA

request

generation

Capture/compare

channels

Complementary

outputs

TIM2

16-bit

Up, down,

up/down

Any integer between

1 and 65536

Yes

TIM21,

TIM22

16-bit

Up, down,

up/down

Any integer between

1 and 65536

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