參數(shù)資料
型號: PIC12C67X
廠商: Microchip Technology Inc.
英文描述: 8-Pin, 8-Bit CMOS Microcontroller with A/D Converter and EEPROM Data Memory
中文描述: 8引腳,8位CMOS微控制器與A / D轉(zhuǎn)換器和EEPROM數(shù)據(jù)存儲器
文件頁數(shù): 61/129頁
文件大小: 931K
代理商: PIC12C67X
1999 Microchip Technology Inc.
DS30561B-page 61
PIC12C67X
FIGURE 9-10: EXTERNAL POWER-ON
RESET CIRCUIT (FOR SLOW
V
DD
POWER-UP)
Note 1:
External Power-on Reset circuit is required only
if V
DD
power-up slope is too slow. The diode D
helps discharge the capacitor quickly when V
DD
powers down.
R < 40 k
is recommended to make sure that
voltage drop across R does not violate the
device’s electrical specification.
R1 = 100
to 1 k
will limit any current flowing
into MCLR from external capacitor C, in the
event of MCLR/V
PP
pin breakdown due to
Electrostatic Discharge (ESD) or Electrical
Overstress (EOS).
2:
3:
C
R1
R
D
V
DD
MCLR
PIC12C67X
FIGURE 9-11: EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 1
FIGURE 9-12: EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 2
Note 1:
This circuit will activate reset when V
DD
goes
below (Vz + 0.7V), where Vz = Zener voltage.
Resistors should be adjusted for the character-
istics of the transistor.
2:
V
DD
33k
10k
4.3k
V
DD
MCLR
PIC12C67X
Note 1:
This brown-out circuit is less expensive,
albeit less accurate. Transistor Q1 turns off
when V
DD
is below a certain level such that:
R1
R1 + R2
2:
Resistors should be adjusted for the charac-
teristics of the transistor.
V
DD
= 0.7V
V
DD
R2
4.3k
PIC12C67X
R1
Q1
V
DD
MCLR
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