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PIC12F629/675

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 V

IN+ is less

than the analog input V

IN-, the output of the comparator

is a digital low level. When the analog input at V

IN+ is

greater than the analog input V

IN-, 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+ 0 0

VIN- < VIN+ 0 1

VIN- > VIN+ 1 1

VIN- < VIN+ 1 0

Output

IN-

VIN+

Output

–

IN+

IN-

Note: CINV bit (CMCON<4>) is clear.

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 127 128

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Microchip Technology Zena Especificaciones Pagina 38