PIC16LC620-04SLASHSS datasheet(54/108 Pages) MICROCHIP

54 / 108 page

PIC16C62X

DS30235G-page 54

Preliminary

FIGURE 9-12: 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 capaci-

tor quickly when VDD powers down.

< 40 k

Ω is recommended to make sure

that voltage drop across R does not vio-

late the device’s electrical speciﬁcation.

3: R1 = 100

Ω to 1 kΩ will limit any current

ﬂowing into MCLR from external capaci-

tor C in the event of MCLR/VPP pin break-

down due to Electrostatic Discharge

(ESD) or Electrical Overstress (EOS).

VDD

MCLR

PIC16C62X

VDD

FIGURE 9-13: EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 1

FIGURE 9-14: 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 cir-

cuit.

VDD

33k

10k

40k

VDD

MCLR

PIC16C62X

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 dis-

abled when using this circuit.

3: Resistors should be adjusted for the

characteristics of the transistor.

VDD x

R1 + R2

= 0.7 V

VDD

40k

VDD

MCLR

PIC16C62X

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