參數(shù)資料
型號： HCS120
廠商： Microchip Technology Inc.
英文描述： Bi-directional Authenticator(雙向文電鑒別碼)
中文描述： 雙向認證者（雙向文電鑒別碼）
文件頁數(shù)： 102/170頁
文件大?。?/td> 4191K
代理商： HCS120
PIC16F62X
DS40300C-page 100
Preliminary
2003 Microchip Technology Inc.
FIGURE 14-11:
EXTERNAL POWER-ON
RESET CIRCUIT (FOR
SLOW V
DD
POWER-UP)
FIGURE 14-12:
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 1
FIGURE 14-13:
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 2
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
PIC16F62X
V
DD
Note
1:
This circuit will activate RESET when V
DD
goes below (Vz + 0.7V) where Vz = Zener
voltage.
Internal Brown-out Detect Reset circuitry
should be disabled when using this circuit.
2:
V
DD
33k
10k
40k
V
DD
MCLR
PIC16F62X
V
DD
R2
40k
V
DD
MCLR
PIC16F62X
R1
Q1
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:
2:
Internal Brown-out Detect Reset should be
disabled when using this circuit.
Resistors should be adjusted for the
characteristics of the transistor.
3:
V
DD
x
R1
R1 + R2
= 0.7V
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