PIC12F609-ESLASHP datasheet(77/212 Pages) MICROCHIP

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DS41302D-page 77

PIC12F609/615/617/12HV609/615

9.11

Comparator Hysteresis

Each comparator has built-in hysteresis that is user

enabled by setting the CMHYS bit of the CMCON1

reduce multiple comparator output transitions when the

output is changing state.

Figure 9-7 shows the relationship between the analog

input levels and digital output of a comparator with and

without hysteresis. The output of the comparator

changes from a low state to a high state only when the

analog voltage at VIN+ rises above the upper

hysteresis

threshold

(VH+).

The

output

the

comparator changes from a high state to a low state

only when the analog voltage at VIN+ falls below the

lower hysteresis threshold (VH-).

FIGURE 9-7:

COMPARATOR HYSTERESIS

–

VIN+

VIN-

Output

Note:

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

VH-

VH+

VIN-

V+

VIN+

Output

(Without Hysteresis)

Output

(With Hysteresis)

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