参数资料
型号: PIC16C620A-04/P301
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDIP18
封装: 0.300 INCH, PLASTIC, DIP-18
文件页数: 59/108页
文件大小: 674K
代理商: PIC16C620A-04/P301
PIC16C62X
DS30235G-page 54
Preliminary
1998 Microchip Technology Inc.
FIGURE 9-12: EXTERNAL POWER-ON
RESET CIRCUIT (FOR SLOW
VDD POWER-UP)
Note 1: External power-on reset circuit is required
only if VDD power-up slope is too slow.
The diode D helps discharge the capaci-
tor quickly when VDD powers down.
2:
< 40 k
is recommended to make sure
that voltage drop across R does not vio-
late the device’s electrical specication.
3: R1 = 100
to 1 k will limit any current
owing into MCLR from external capaci-
tor C in the event of MCLR/VPP pin break-
down due to Electrostatic Discharge
(ESD) or Electrical Overstress (EOS).
C
R1
R
D
VDD
MCLR
PIC16C62X
VDD
FIGURE 9-13: EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 1
FIGURE 9-14: EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 2
Note 1: This circuit will activate reset when VDD
goes below (Vz + 0.7V) where
Vz = Zener voltage.
2: Internal Brown-out Reset circuitry
should be disabled when using this cir-
cuit.
VDD
33k
10k
40k
VDD
MCLR
PIC16C62X
Note 1: This brown-out circuit is less expensive,
albeit less accurate. Transistor Q1 turns
off when VDD is below a certain level
such that:
2: Internal brown-out reset should be dis-
abled when using this circuit.
3: Resistors should be adjusted for the
characteristics of the transistor.
VDD x
R1
R1 + R2
= 0.7 V
VDD
R2
40k
VDD
MCLR
PIC16C62X
R1
Q1
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