Chapter 29
Comparator (CMP)
29.1 Introduction
NOTE
For the chip-specific implementation details of this module's
instances see the chip configuration information.
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 6-bit digital-to-analog converter (DAC).
The mux circuit is designed to operate across the full range of the supply voltage.
The 6-bit DAC is 64-tap resistor ladder network which provides a selectable voltage
reference for applications where voltage reference is needed. The 64-tap resistor ladder
network divides the supply reference V
in
into 64 voltage levels. A 6-bit digital signal
input selects the output voltage level, which varies from V
in
to V
in
/64. V
in
can be selected
from two voltage sources, V
in1
and V
in2
. The 6-bit DAC from a comparator is available
as an on-chip internal signal only and is not available externally to a pin.
29.2 CMP features
The CMP has the following features:
• Operational over the entire supply range
• Inputs may range from rail to rail
• Programmable hysteresis control
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
Freescale Semiconductor, Inc. 509
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