PIC16LC924-08/CL View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LC924-08/CL

8-Bit CMOS Microcontroller with LCD Driver

Microchip Technology 

PIC16C9XX

FIGURE 14-11:EXTERNAL POWER-ON

RESET CIRCUIT (FOR SLOW

VDD POWER-UP)

VDD

D

R

C

R1

MCLR

PIC16CXXX

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 kΩ is recommended to make sure

that voltage drop across R does not violate

the device’s electrical specification.

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

flowing into MCLR from external capacitor

C in the event of MCLR/VPP pin break-

down due to Electrostatic Discharge

(ESD) or Electrical Overstress (EOS).

FIGURE 14-12:EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 1

VDD

33k

VDD

10k

MCLR

40k PIC16CXXX

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 char-

acteristics of the transistors.

FIGURE 14-13:EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 2

VDD

R1

R2

VDD

Q1

MCLR

40k PIC16CXXX

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:

VDD •

R1 = 0.7V

R1 + R2

2: Resistors should be adjusted for the

characteristics of the transistors.

DS30444E - page 112

© 1997 Microchip Technology Inc.

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