Datasheet

Functional overview STM32L476xx
44/270 DS10198 Rev 8
3.18 Comparators (COMP)
The STM32L476xx devices embed two rail-to-rail comparators with programmable
reference voltage (internal or external), hysteresis and speed (low speed for low-power) and
with selectable output polarity.
The reference voltage can be one of the following:
• External I/O
• DAC output channels
• Internal reference voltage or submultiple (1/4, 1/2, 3/4).
All comparators can wake up from Stop mode, generate interrupts and breaks for the timers
and can be also combined into a window comparator.
3.19 Operational amplifier (OPAMP)
The STM32L476xx embeds two operational amplifiers with external or internal follower
routing and PGA capability.
The operational amplifier features:
• Low input bias current
• Low offset voltage
• Low-power mode
• Rail-to-rail input
3.20 Touch sensing controller (TSC)
The touch sensing controller provides a simple solution for adding capacitive sensing
functionality to any application. Capacitive sensing technology is able to detect finger
presence near an electrode which is protected from direct touch by a dielectric (glass,
plastic, ...). The capacitive variation introduced by the finger (or any conductive object) is
measured using a proven implementation based on a surface charge transfer acquisition
principle.
The touch sensing controller is fully supported by the STMTouch touch sensing firmware
library which is free to use and allows touch sensing functionality to be implemented reliably
in the end application.
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