RM0091 Comparator (COMP)
Doc ID 018940 Rev 1 215/742
14 Comparator (COMP)
14.1 COMP introduction
The STM32F05xxx embeds two general purpose comparators COMP1 and COMP2 that
can be used either as standalone devices (all terminal are available on I/Os) or combined
with the timers. They can be used for a variety of functions including:
● Wake-up 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.
14.2 COMP main features
● Rail-to-rail comparators
● Each comparator have selectable threshold
– 3 I/O pins
–DAC1
– The internal reference voltage and three sub-multiple values (1/4, 1/2, 3/4)
● Programmable hysteresis
● Programmable speed and consumption
● The outputs can be redirected to an I/O or to multiple timer inputs for triggering:
– Capture events
– OCref_clr events (for cycle-by-cycle current control)
– Break events for fast PWM shutdowns
● Every two comparators can be combined in a window comparator (COMP1/COMP2,).
● The two comparators can be combined in a window comparator
● Each comparator has interrupt generation capability with wake-up from Sleep and Stop
modes (through the EXTI controller)
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