RM0367 Rev 7 377/1043
RM0367 Comparator (COMP)
383
16 Comparator (COMP)
16.1 Introduction
STM32L0x3 devices embed two ultra-low-power comparators COMP1, and COMP2 that
can be used either as standalone devices (all terminal are available on I/Os) or combined
with the timers.
The comparators can be used for a variety of functions including:
• Wakeup from low-power mode triggered by an analog signal,
• Analog signal conditioning,
• Cycle-by-cycle current control loop when combined with the DAC and a PWM output
from a timer.
16.2 COMP main features
• COMP1 comparator with ultra low consumption
• COMP2 comparator with rail-to-rail inputs, fast or slow mode
• Each comparator has positive and configurable negative inputs used for flexible voltage
selection:
– I/O pins
–DAC
– Internal reference voltage and three submultiple values (1/4, 1/2, 3/4) provided by
scaler (buffered voltage divider)
• Programmable speed / consumption (COMP2 only)
• The outputs can be redirected to an I/O or to timer inputs for triggering:
– Capture events
• COMP1, and COMP2 can be combined in a window comparator. Each comparator has
interrupt generation capability with wakeup from Sleep and Stop modes (through the
EXTI controller)
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