pic16c61 Microchip Technology Inc., pic16c61 Datasheet - Page 135

• Manufacturer Part Number: pic16c61
• Description: 8-bit Cmos Microcontrollers Technology
• Manufacturer: Microchip Technology Inc.

FIGURE 13-14: EXTERNAL POWER-ON
Note 1: External Power-on Reset circuit is required
1997 Microchip Technology Inc.
2: R < 40 k is recommended to make sure
3: R1 = 100 to 1 k will limit any current
only if V
diode D helps discharge the capacitor
quickly when V
that voltage drop across R does not violate
the devices electrical specifications.
flowing into MCLR from external capacitor
C in the event of MCLR/V
down due to Electrostatic Discharge
(ESD) or Electrostatic Overstress (EOS).
D
V
DD
RESET CIRCUIT (FOR SLOW
V
DD
R
DD
C
power-up slope is too slow. The
POWER-UP)
DD
R1
powers down.
PIC16CXX
MCLR
PP
pin break-
FIGURE 13-15: EXTERNAL BROWN-OUT
FIGURE 13-16: EXTERNAL BROWN-OUT
Note 1: This brown-out circuit is less expensive,
Note 1: This circuit will activate reset when V
V
V
2: Internal brown-out detection on the
3: Resistors should be adjusted for the
2: Internal brown-out detection on the
3: Resistors should be adjusted for the
DD
DD
albeit less accurate. Transistor Q1 turns
off when V
that:
PIC16C62A/R62/63/R63/64A/R64/65A/
R65/66/67 should be disabled when using
this circuit.
characteristics of the transistors.
goes below (Vz + 0.7V) where Vz = Zener
voltage.
PIC16C62A/R62/63/R63/64A/R64/65A/
R65/66/67 should be disabled when using
this circuit.
characteristics of the transistors.
R1
R2
33k
V
DD
PROTECTION CIRCUIT 1
PROTECTION CIRCUIT 2
•
10k
DD
R1 + R2
is below a certain level such
R1
Q1
PIC16C6X
40k
40k
= 0.7V
MCLR
DS30234D-page 135
V
PIC16CXX
MCLR
V
PIC16CXX
DD
DD
DD