PIC16F628A-I/P Microchip Technology Inc., PIC16F628A-I/P Datasheet - Page 102
PIC16F628A-I/P
Manufacturer Part Number
PIC16F628A-I/P
Description
18 PIN, 3.5 KB FLASH, 224 RAM, 16 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16F628A-IP.pdf
(170 pages)
Specifications of PIC16F628A-I/P
Comparators
2
Cpu Speed
5 MIPS
Eeprom Memory
128 Bytes
Input Output
16
Interface
USART
Memory Type
Flash
Number Of Bits
8
Package Type
18-pin PDIP
Programmable Memory
3.5K Bytes
Ram Size
224 Bytes
Speed
20 MHz
Timers
2-8-bit, 1-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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PIC16F62X
FIGURE 14-11:
FIGURE 14-12:
DS40300C-page 100
Note 1: External Power-on Reset circuit is required
Note 1: This circuit will activate RESET when V
V
V
DD
DD
2: R < 40 kΩ is recommended to make sure
3: R1 = 100Ω to 1 kΩ will limit any current
2: Internal Brown-out Detect Reset circuitry
D
33k
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
due to Electrostatic Discharge (ESD) or
Electrical Overstress (EOS).
goes below (Vz + 0.7V) where Vz = Zener
voltage.
should be disabled when using this circuit.
V
DD
R
DD
C
10k
EXTERNAL POWER-ON
RESET CIRCUIT (FOR
SLOW V
power-up slope is too slow. The
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 1
DD
R1
powers down.
40k
DD
PP
POWER-UP)
MCLR
V
PIC16F62X
PIC16F62X
MCLR
DD
pin breakdown
DD
Preliminary
FIGURE 14-13:
Note
V
DD
1:
2:
3:
R1
R2
This Brown-out Circuit is less expensive, albeit
less accurate. Transistor Q1 turns off when V
below a certain level such that:
Internal Brown-out Detect Reset should be
disabled when using this circuit.
Resistors should be adjusted for the
characteristics of the transistor.
Vdd x
V
DD
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 2
x
2003 Microchip Technology Inc.
R1 + R2
R1 + R2
R1
R1
Q1
40k
= 0.7 V
= 0.7V
MCLR
V
PIC16F62X
DD
DD
is
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