PIC16CR620A-04E/SS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16CR620A-04E/SS

EPROM-Based 8-Bit CMOS Microcontrollers

Microchip Technology 

PIC16C62X

FIGURE 9-11:

VDD

EXTERNAL POWER-ON

RESET CIRCUIT (FOR

SLOW VDD POWER-UP)

VDD

R

D

R1

MCLR

C

PIC16C62X

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.

2: < 40 kΩ is recommended to make sure

that voltage drop across R does not

violate the device’s electrical specifica-

tion.

3: R1 = 100Ω to 1 kΩ will limit any current

flowing into MCLR from external capaci-

tor C in the event of MCLR/VPP pin

breakdown due to Electrostatic

Discharge (ESD) or Electrical Over-

stress (EOS).

FIGURE 9-12:

VDD

33k

EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 1

VDD

10k

MCLR

40k

PIC16C62X

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.

FIGURE 9-13:

VDD

R1

R2

EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 2

VDD

Q1

40k

MCLR

PIC16C62X

Note 1: This brown-out circuit is less expen-

sive, albeit less accurate. Transistor

Q1 turns off when VDD is below a

certain level such that:

R1

VDD x R1 + R2 = 0.7V

2: Internal Brown-out Reset should be

disabled when using this circuit.

3: Resistors should be adjusted for the

characteristics of the transistor.

FIGURE 9-14:

EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 3

VDD

MCP809

Vss

bypass

capacitor

VDD

RST

VDD

MCLR

PIC16C62X

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.

DS30235J-page 54

 2003 Microchip Technology Inc.

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