Comparator (COMP) RM0453
620/1450 RM0453 Rev 5
21 Comparator (COMP)
21.1 COMP introduction
The device embeds two ultra-low-power comparators (COMP1 and COMP2).
These comparators can be used for a variety of functions including the following:
• wake up from low-power mode triggered by an analog signal
• analog signal conditioning
• cycle-by-cycle current control loop when combined with a PWM output from a timer
21.2 COMP main features
• Configurable plus and minus inputs used for flexible voltage:
– Multiplexed I/O pins
– DAC channel1
– Internal reference voltage and three sub multiple values (1/4, 1/2, 3/4) provided by
scaler (buffered voltage divider)
• Programmable hysteresis
• Programmable speed / consumption
• Redirection of outputs to an I/O or to timer inputs for triggering:
– break events for fast PWM shutdowns
• Blanking of comparator outputs
• Window comparator
• Interrupt generation capability with wake up from Sleep and Stop modes (through the
EXTI controller)
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