PIC12F615T-ESLASHPSQTP datasheet(65/168 Pages) MICROCHIP

65 / 168 page

Preliminary

DS41302A-page 63

PIC12F609/615/12HV609/615

8.11

Comparator Hysteresis

Each comparator has built-in hysteresis that is user

enabled by setting the CMHYS bit of the CMCON1 reg-

ister. The hysteresis feature can help filter noise and

reduce multiple comparator output transitions when the

output is changing state.

Figure 8-7 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 of 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 8-7:

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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