PIC16CE624T-04SS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16CE624T-04SS

OTP 8-Bit CMOS MCU with EEPROM Data Memory

Microchip Technology 

PIC16CE62X

FIGURE 10-11: EXTERNAL POWER-ON

RESET CIRCUIT (FOR SLOW

VDD POWER-UP)

VDD

VDD

D

R

R1

MCLR

C

PIC16CE62X

Note 1:

2:

3:

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 kΩ is recommended to make sure that

voltage drop across R does not violate the

device’s electrical specification.

R1 = 100Ω to 1 kΩ 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).

FIGURE 10-12: EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 1

VDD

33k

VDD

10k

MCLR

40k PIC16CE62X

Note 1:

2:

This circuit will activate reset when VDD

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

voltage.

Internal Brown-out Reset circuitry should be

disabled when using this circuit.

FIGURE 10-13: EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 2

VDD

R1

VDD

Q1

MCLR

R2

40k PIC16CE62X

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:

R1

VDD x

= 0.7 V

R1 + R2

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.

FIGURE 10-14: EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 3

VDD

MCP809

bypass

VSS

capacitor

VDD

RST

VDD

MCLR

PIC16CE62X

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.

DS40182C-page 58

© 1999 Microchip Technology Inc.

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