PIC16LC62X-04/JW View Datasheet(PDF) - Microchip Technology
Part Name
Description
MFG CO.
'PIC16LC62X-04/JW' PDF : 112 Pages View PDF
PIC16C62X(A)
FIGURE 9-12: EXTERNAL POWER-ON
RESET CIRCUIT (FOR SLOW
VDD POWER-UP)
VDD
VDD
D
R
R1
MCLR
C
PIC16C62X(A)
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.
2: < 40 kΩ is recommended to make sure
that voltage drop across R does not vio-
late the device’s electrical specification.
3: R1 = 100Ω 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).
FIGURE 9-13: EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 1
VDD
33k
VDD
10k
MCLR
40k PIC16C62X(A)
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.
FIGURE 9-14: EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 2
VDD
R1
VDD
Q1
MCLR
R2
40k PIC16C62X(A)
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 R1 + R2 = 0.7 V
2: Internal brown-out detection should be
disabled when using this circuit.
3: Resistors should be adjusted for the
characteristics of the transistor.
DS30235F-page 54
Preliminary
© 1997 Microchip Technology Inc.
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