PIC12F635ESLASHP datasheet(70/196 Pages) MICROCHIP

Part #	PIC12F635E/P

Description	8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY

PDF	196 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

Logo

70 / 196 page

PIC12F635/PIC16F636/639

DS41232B-page 68

Preliminary

7.6

Comparator Reference

The comparator module also allows the selection of an

internally generated voltage reference for one of the

comparator inputs. The VRCON register (Register 7-3)

controls the voltage reference module shown in

Figure 7-8.

7.6.1

CONFIGURING THE VOLTAGE

REFERENCE

The voltage reference can output 32 distinct voltage

levels, 16 in a high range and 16 in a low range.

The following equation determines the output voltages:

EQUATION 7-1:

7.6.2

VOLTAGE REFERENCE

ACCURACY/ERROR

The voltage reference is VDD derived and therefore, the

CVREF output changes with fluctuations in VDD. The

tested absolute accuracy of the comparator voltage

reference can be found in Section 15.0 “Electrical

Specifications”.

FIGURE 7-8:

COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM

VRR = 1 (low range): CVREF = (VR<3:0>/24) x VDD

VRR = 0 (high range):

CVREF = (VDD/4) + (VR<3:0> x VDD/32)

VRR

VR<3:0>

16-1 Analog

CVREF to

16 Stages

Comparator

Input

VREN

VDD

MUX

PIC12F635E/P Datasheet(PDF) 70 Page - Microchip Technology