參數(shù)資料
型號(hào)： 16LF628A
廠商： Microchip Technology Inc.
元件分類： 8位微控制器
英文描述： FLASH-Based 8-Bit CMOS Microcontrollers
中文描述： 基于閃存的8位CMOS微控制器
文件頁數(shù)： 105/168頁
文件大?。?/td> 3760K
代理商： 16LF628A
2002 Microchip Technology Inc.
Preliminary
DS40044A-page 103
PIC16F627A/628A/648A
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
PIC16F627A/628A/648A
V
DD
Note
1:
This circuit will activate RESET when V
DD
goes below (Vz + 0.7V) where Vz = Zener
voltage.
Internal Brown-out Reset circuitry should
be disabled when using this circuit.
2:
V
DD
33k
10k
40k
V
DD
MCLR
PIC16F627A/628A/648A
Vdd x
R1
V
DD
R2
40k
V
DD
MCLR
PIC16F627A/628A/648A
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 Res= 0.7 V
abled when uR1 + R2
Resistors should be adjusted for the charac-
teristics of the transistor.
3:
V
DD
x
R1
R1 + R2
= 0.7 V
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