EFM32WG Datasheet, PDF (661/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

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26 ACMP - Analog Comparator
0123 4
26.1 Introduction
What?
Quick Facts
The ACMP (Analog Comparator) compares
two analog signals and returns a digital value
telling which is greater.
Why?
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.
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.
26.2 Features
• 8 selectable external positive inputs
• 8 selectable external negative inputs
• 5 selectable internal negative inputs
• Internal 1.25 V bandgap
• Internal 2.5 V bandgap
• V_DD scaled by 64 selectable factors
• DAC channel 0 and 1
• 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
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
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