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Спецификация HA1835P изготовлена «Hitachi Semiconductor» и имеет функцию, называемую «Watchdog Timer». |
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Детали детали
Номер произв | HA1835P |
Описание | Watchdog Timer |
Производители | Hitachi Semiconductor |
логотип |
13 Pages
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HA1835P/HA1848P
Watchdog Timer
Description
The HA1835P and HA1848P is a monolithic voltage regulator control designed for microcomputer
systems. In addition to the voltage regulator, it include watchdog timer function and power-on reset
function.
These ICs can perform many function in various microcomputer systems with few external parts.
Features
• Regulated power supply control function
Wide area of operational voltage; VCC = 6 V to 30 V
Available external PNP-type transistor, suited to any system power supply
Built-in overcurrent limiter for external PNP-type transistor
Output voltage can be adjusted exactry in the range from 4 V to 6 V
• Watchdog timer
Internal bandpass filter control circuit (pulse width detect type) and reset signal oscillator
Fail-safe utility
Bandpass filter characteristics can be set by external resister (Rf) and capacitance (Cf)
• Automatic reset
Automatic power-on reset
Pulse generator characteristics can be set by external resistor (RR) and capacitance (CR)
Alternative between RES and RES output
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HA1835P/HA1848P
Pin Arrangement
RR
CR
P-RUN
1
2
3
14 RES
13 RES
12 CS
Rf
Cf
Vout
4
5
6
11 VCC
10 VCONT
9 Comp *
GND 7
8 Vadj
(Top View)
Note: HA1848P: 9 pin is non connection.
Pin Functions
Pin No. Symbol
Functions
1 RR
Reset pulse width depends on resistance connected to RR
Recommended range: 100 kΩ to 1 MΩ
2 CR
Reset pulse width depends on capacitance connected to CR
3
P-RUN
Clock pulse input terminal for watchdog timer
4 Rf
Frequency band width of filter circuit depends on resistance connected to Rf
Recommended range: 100 kΩ to 500 kΩ
5 Cf
Frequency band width of filter circuit depends on capacitance connected to Cf
6
Vout
Connect to external PNP transistor's collector: This pin supplies 5 V regulated
voltage for internal circuit
7
GND
Ground
8 Vadj Output voltage fine tuning terminal
9
Comp
Phase compensation terminal: Connect less than 100 pF capacitor between VCC
and Comp. HA1848P is non connection
10 VCONT
External PNP transistor's base control terminal
11 VCC
Supply voltage terminal: Operating supply voltage range is 6 V to 30 V
12 CS
Connect current sense resistor, which protects the external PNP transistor,
between VCC and CS
13
RES *
Reset pulse output terminal for low level reset type microcomputer
14
RES *
Reset pulse output terminal for high level reset type microcomputer
Note: RES and RES are open-collector output terminals, so connect a pull-up resistor of about 5 kΩ.
2
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Block Diagram
HA1835P/HA1848P
VCC
C1
RCS
Q
11 VCC
CS
12
10 VCONT
Vout
6
Current
Limiter
Reference
Voltage
Error
Amp
5 kΩ
2 kΩ
P-RUN 3
Fail Detector
(Band Pass Filter)
Power on Reset Detector
Reset Signal Oscillator
Vout
HA1835P
9 Comp *
8 Vadj
14 RES
13 RES
74 5 1
Rf Cf RR
300 kΩ 0.01 µF 560 kΩ
GND
Note: HA1848P: 9 pin is non connection.
2
CR
0.1 µF
3
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Номер в каталоге | Описание | Производители |
HA1835P | Watchdog Timer | Hitachi Semiconductor |
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