PIC12LC671 datasheet(61/129 Pages) MICROCHIP

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DS30561B-page 61

PIC12C67X

FIGURE 9-10: 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.

2: R < 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

PIC12C67X

FIGURE 9-11: EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 1

FIGURE 9-12: 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: Resistors should be adjusted for the character-

istics of the transistor.

VDD

33k

10k

4.3k

VDD

MCLR

PIC12C67X

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: Resistors should be adjusted for the charac-

teristics of the transistor.

VDD •

R1 + R2

= 0.7V

VDD

4.3k

PIC12C67X

VDD

MCLR

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