PIC12CE67 Microchip Technology, PIC12CE67 Datasheet - Page 53

• Manufacturer Part Number: PIC12CE67
• Description: 8-Pin/ 8-Bit CMOS Microcontroller with A/D Converter and EEPROM Data Memory
• Manufacturer: Microchip Technology

FIGURE 9-11: EXTERNAL POWER-ON
Note 1: External Power-on Reset circuit is required
1998 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 device’s electrical specification.
flowing into MCLR from external capacitor
C in the event of MCLR/V
down due to Electrostatic Discharge
(ESD) or Electrical 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.
PIC12CE67X
MCLR
PP
pin break-
Preliminary
FIGURE 9-12: EXTERNAL BROWN-OUT
FIGURE 9-13: EXTERNAL BROWN-OUT
Note 1: This circuit will activate reset when V
Note 1: This brown-out circuit is less expensive,
V
V
2: Internal brown-out detection should be
3: Resistors should be adjusted for the char-
DD
2: Internal brown-out detection should be
3: Resistors should be adjusted for the
DD
goes below (Vz + 0.7V) where Vz = Zener
voltage.
disabled when using this circuit.
acteristics of the transistor.
R1
R2
33k
albeit less accurate. Transistor Q1 turns
off when V
such that:
disabled, if available, when using this
circuit.
characteristics of the transistor.
V
DD
PROTECTION CIRCUIT 1
PROTECTION CIRCUIT 2
•
10k
PIC12CE67X
DD
R1 + R2
is below a certain level
R1
Q1
4.3k
4.3k
= 0.7V
PIC12CE67X
PIC12CE67X
DS40181B-page 53
V
MCLR
V
MCLR
DD
DD
DD