PIC12F675T-ESLASHP datasheet(38/136 Pages) MICROCHIP

38 / 136 page

PIC12F629/675

DS41190G-page 38

 2010 Microchip Technology Inc.

6.1

Comparator Operation

A single comparator is shown in Figure 6-1, along with

the relationship between the analog input levels and

the digital output. When the analog input at VIN+ is less

than the analog input VIN-, the output of the comparator

is a digital low level. When the analog input at VIN+ is

greater than the analog input VIN-, the output of the

comparator is a digital high level. The shaded areas of

the output of the comparator in Figure 6-1 represent

the uncertainty due to input offsets and response time.

The polarity of the comparator output can be inverted

by setting the CINV bit (CMCON<4>). Clearing CINV

results in a non-inverted output. A complete table

showing the output state versus input conditions and

the polarity bit is shown in Table 6-1.

TABLE 6-1:

OUTPUT STATE VS. INPUT

CONDITIONS

FIGURE 6-1:

SINGLE COMPARATOR

Note:

To use CIN+ and CIN- pins as analog

inputs, the appropriate bits must be

programmed in the CMCON (19h) register.

Input Conditions

CINV

COUT

VIN- > VIN+

VIN- < VIN+

VIN- > VIN+

VIN- < VIN+

Output

VIN-

VIN+

Output

–

VIN+

VIN-

Note:

CINV bit (CMCON<4>) is clear.

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