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23 ACMP - Analog Comparator
Quick Facts
What?
The ACMP (Analog Comparator) compares
two analog signals and returns a digital value
telling which is greater.
Why?
0 1 2 3
4
Applications often do not need to know the
exact value of an analog signal, only if it has
passed a certain threshold. Often the voltage
must be monitored continuously, which
requires extremely low power consumption.
How?
Available down to Energy Mode 3 and using
as little as 100 nA, the ACMP can wake
up the system when input signals pass
the threshold. The analog comparator can
compare two analog signals or one analog
signal and a highly configurable internal
reference.
23.1 Introduction
The Analog Comparator is used to compare the voltage of two analog inputs, with a digital output
indicating which input voltage is higher. Inputs can either be one of the selectable internal references
or from external pins. Response time and thereby also the current consumption can be configured by
altering the current supply to the comparator.
23.2 Features
? 8 selectable external positive inputs
? 8 selectable external negative inputs
? 3 selectable internal negative inputs
? Internal 1.25 V bandgap
? Internal 2.5 V bandgap
? V DD scaled by 64 selectable factors
? Low power mode for internal V DD and bandgap references
? Selectable hysteresis
? 8 levels between 0 and ±70 mV
? Selectable response time
? Asynchronous interrupt generation on selectable edges
? Rising edge
? Falling edge
? Both edges
? Operational in EM0-EM3
? Dedicated capacitive sense mode with up to 8 inputs
? Adjustable internal resistor
? Configurable inversion of comparator output
? Configurable output when inactive
2011-04-12 - d0001_Rev1.10
322
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