PIC16F628-20SLASHSS datasheet(106/160 Pages) MICROCHIP

106 / 160 page

PIC16F62X

DS40300B-page 106

Preliminary

FIGURE 14-13: EXTERNAL POWER-ON

RESET CIRCUIT (FOR SLOW

VDD POWER-UP)

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

Ω is recommended to make sure that

voltage drop across R does not violate the

device’s electrical specification.

3: R1 = 100

Ω 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).

VDD

MCLR

PIC16F62X

VDD

FIGURE 14-14: EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 1

FIGURE 14-15: EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 2

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

VDD

MCLR

PIC16F62X

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 reset should be disabled

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

VDD

MCLR

PIC16F62X

PIC16F628-20/SS 데이터시트(PDF) 106 Page - Microchip Technology

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