Microchip Technology MCP1631RD-MCC2 Data Sheet

 2006-2012 Microchip Technology Inc.

DS41291G-page 89

Comparators are used to interface analog circuits to a
digital circuit by comparing two analog voltages and
providing a digital indication of their relative magnitudes.
The comparators are very useful mixed signal building
blocks because they provide analog functionality
independent of the program execution. The analog
comparator module includes the following features:
• Independent comparator control
• Programmable input selection
• Comparator output is available internally/externally
• Programmable output polarity
• Interrupt-on-change
• Wake-up from Sleep
• PWM  shutdown
• Timer1 gate (count enable)
• Output synchronization to Timer1 clock input
• SR  Latch
• Programmable and fixed voltage reference

A single comparator is shown in 

 along with

the relationship between the analog input levels and
the digital output. When the analog voltage at V

IN

+ is

less than the analog voltage at V

IN

-, the output of the

comparator is a digital low level. When the analog
voltage at V

IN

+ is greater than the analog voltage at

V

IN

-, the output of the comparator is a digital high level.

Only Comparator C2 can be linked to
Timer1.

–

+

V

IN

+

V

IN

-

Output

Output

V

IN

+

V

IN

-

The black areas of the output of the
comparator represents the uncertainty
due to input offsets and response time.