PIC16CE623 datasheet(58/114 Pages) MICROCHIP

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PIC16CE62X

DS40182D-page 58

 1998-2013 Microchip Technology Inc.

FIGURE 10-11: EXTERNAL POWER-ON

RESET CIRCUIT (FOR SLOW

VDD POWER-UP)

FIGURE 10-12: EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 1

Note 1:

External power-on reset circuit is required only

if VDD power-up slope is too slow. The diode D

helps discharge the capacitor quickly when

VDD powers down.

< 40 k

 is recommended to make sure that

voltage drop across R does not violate the

device’s electrical specification.

3: R1 = 100

 to 1 k will limit any current flowing

into MCLR from external capacitor C in the

event of MCLR/VPP pin breakdown due to

Electrostatic Discharge (ESD) or Electrical

Overstress (EOS).

VDD

MCLR

PIC16CE62X

VDD

Note 1:

This circuit will activate reset when VDD

goes below (Vz + 0.7V) where Vz = Zener

voltage.

2: Internal Brown-out Reset circuitry should be

disabled when using this circuit.

VDD

33k

10k

40k

PIC16CE62X

VDD

MCLR

FIGURE 10-13: EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 2

FIGURE 10-14: EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 3

Note 1:

This brown-out circuit is less expensive,

albeit less accurate. Transistor Q1 turns off

when VDD is below a certain level such that:

2: Internal brown-out detection should be dis-

abled when using this circuit.

3: Resistors should be adjusted for the charac-

teristics of the transistor.

VDD x

R1 + R2

= 0.7 V

VDD

40k

PIC16CE62X

VDD

MCLR

This brown-out protection circuit employs Microchip

Technology’s MCP809 microcontroller supervisor. The

MCP8XX and MCP1XX families of supervisors provide

push-pull and open collector outputs with both high and

low active reset pins. There are 7 different trip point

selections to accommodate 5V and 3V systems.

MCLR

PIC16CE62X

VDD

VSS

RST

MCP809

VDD

bypass

capacitor

PIC16CE623 Datasheet(PDF) 58 Page - Microchip Technology

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