Ultralow Power Comparators And Reference Voltage; Routing Interface; Timers And Watchdogs - STMicroelectronics STM32L151CB Manual

STM32L151xx, STM32L152xx
3.12

Ultralow power comparators and reference voltage

The STM32L15xxx 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:
–
–
–
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 ultralow power STM32L15xxx devices include six general-purpose timers, two basic
timers and two watchdog timers.
Table 3 compares the features of the general-purpose and basic timers.
Table 3.
Timer
TIM2,
TIM3,
TIM4
TIM9
TIM10,
TIM11
TIM6,
TIM7
DAC output
External I/O
Internal reference voltage (V
Timer feature comparison
Counter Counter
resolution type
Up,
16-bit down,
up/down
16-bit Up
16-bit Up
16-bit Up
) or V
REFINT REFINT
Prescaler DMA request
factor generation
Any integer
between 1 Yes
and 65536
Any integer
between 1 No
and 65536
Any integer
between 1 No
and 65536
Any integer
between 1 Yes
and 65536
Doc ID 17659 Rev 6
Functional overview
submultiple (1/4, 1/2, 3/4)
Capture/compare Complementary
channels
4
2
1
0
outputs
No
No
No
No
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