NXP Semiconductors KE1xF Series, Reference Manual, Page: 871 / 1483

38.2 Introduction
The comparator (CMP) module provides a circuit for comparing two analog input
voltages. The comparator circuit is designed to operate across the full range of the supply
voltage, known as rail-to-rail operation.
The Analog MUX (ANMUX) provides a circuit for selecting an analog input signal from
eight channels. One signal is provided by the 8-bit digital-to-analog converter (DAC).
The mux circuit is designed to operate across the full range of the supply voltage.
The DAC is a 256-tap resistor ladder network that provides a selectable voltage reference
for applications requiring a voltage reference. The 256-tap resistor ladder network divides
the supply reference V
in
into 256 voltage levels. A 8-bit digital signal input selects the
output voltage level, which varies from V
in
to V
in
/256. V
in
can be selected from two
voltage sources, V
in1
and V
in2
. The DAC from a comparator is available as an on-chip
internal signal only and is not available externally to a pin.
38.3 Features
The following subsections list the features of the CMP, the DAC, and the ANMUX.
38.3.1 CMP features
The CMP has the following features:
• Operational over the entire supply range
• Inputs may range from rail to rail
• Programmable hysteresis control
• Selectable interrupt on rising-edge, falling-edge, or both rising or falling edges of the
comparator output
• Selectable inversion on comparator output
• Capability to produce a wide range of outputs such as:
• Sampled
• Windowed, which is ideal for certain PWM zero-crossing-detection applications
• Digitally filtered:
Chapter 38 Comparator (CMP)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors 871