STM32L100RB datasheet(25/103 Pages) STMICROELECTRONICS

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STM32L100C6 STM32L100R8/RB

Functional overview

3.12

Ultra-low-power comparators and reference voltage

The STM32L100C6 and STM32L100R8/RB 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 VREFINT submultiple (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).

3.13

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

Timers and watchdogs

The ultra-low-power STM32L100C6 and STM32L100R8/RB devices include six general-

purpose timers, two basic timers and two watchdog timers.

Table 5 compares the features of the general-purpose and basic timers.

Table 5. 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

Up,

down,

up/down

Any integer

between 1

and 65536

TIM10,

TIM11

16-bit

Any integer

between 1

and 65536

TIM6,

TIM7

16-bit

Any integer

between 1

and 65536

Yes

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