Datasheet

DocID027973 Rev 5 27/119
STM32L011x3/4 Functional overview
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3.12 Ultra-low-power comparators and reference voltage
The STM32L011x3/4 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 (V
REFINT
)
– 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 and LPTIM1 timer input captures. It also controls the
routing of internal analog signals to the ADC, COMP1 and COMP2 and the internal
reference voltage V
REFINT
.
3.14 Timers and watchdogs
The ultra-low-power STM32L011x3/4 devices include two general-purpose timers, one low-
power timer (LPTIM1), two watchdog timers and the SysTick timer.
Table 7 compares the features of the general-purpose and basic timers.
Table 7. 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 4 No
TIM21 16-bit
Up, down,
up/down
Any integer between
1 and 65536
No 2 No
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