1.3.1 1.4.1 1.5.1 1.29.1 1.38.1 1.40.1 Analog Comparators (AC)

The Analog Comparator peripheral (AC) supports four individual comparators. Each comparator (COMP) compares the voltage levels on two inputs ('+' and '-' input pins of the comparator), and provides a digital output based on this comparison. Each comparator may be configured to generate interrupt requests and/or peripheral events upon several different combinations of input change.

The AC peripheral implements two pairs of comparators. Each pair can be set in window mode to compare a signal to a voltage range instead of a single voltage level.

Using The Library

AC Peripheral library provides non-Blocking API's and they can be used to perform below functionalities on the AC peripheral.

  • Initialize the AC

  • Start comparison on a given comparator

  • Swap inputs of a comparator

  • Get status of a comparison operation

  • Register a callback

Library Interface

Analog Comparators peripheral library provides the following interfaces:

Functions

Name Description
AC_Initialize Initializes AC module of the device
AC_Start Triggers a comparator to start comparison
AC_SwapInputs Swap inputs of a comparator
AC_ChannelSelect Selects the positive and negative inputs of a channel
AC_SetVddScalar Sets VDDSCALER value of a comparator
AC_StatusGet Returns comparison status of the AC
AC_CallbackRegister Allows application to register callback with PLIB

Data types and constants

Name Type Description
AC_CHANNEL Enum Identifies the AC output channel number
AC_POSINPUT Enum Identifies the positive inputs of a comparator channel
AC_NEGINPUT Enum Identifies negative inputs of a comparator channel
AC_CALLBACK Typedef Analog comparator callback function pointer