PIC12F609T-I/P View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC12F609T-I/P

8-Pin Flash-Based, 8-Bit CMOS Microcontrollers

Microchip Technology 

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

register. The hysteresis feature can help filter noise and

reduce multiple comparator output transitions when the

output is changing state.

FIGURE 9-7:

COMPARATOR HYSTERESIS

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 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-).

VIN+

+

VIN-

–

Output

V+

VH+

VIN-

VH-

VIN+

Output

(Without Hysteresis)

Output

(With Hysteresis)

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

 2010 Microchip Technology Inc.

DS41302D-page 77

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