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PDF HA1848P Data sheet ( Hoja de datos )
| Número de pieza | HA1848P | |
| Descripción | Watchdog Timer | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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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
1 page  
HA1835P/HA1848P
Electrical Characteristics (VCC = 12 V, Vout = 5 V, Ta = 25°C)
Item
Power supply terminal current
Symbol Min
ICC —
Typ
6.3
Regulator Output voltage
Vout1 4.75
section
Vout2 4.70
Line regulation
Load regulation
Ripple rejection
Limiter operating current
Output voltage temperature
coefficient
δVOline
–50
δVOload
–100
RREJ
40
ICS 1.0
δVout/δT —
P-RUN input Low-level input voltage
section
High-level input voltage
Low-level input current
High-level input current
Reset circuit Reset terminal low-level
section
voltage
VIL
VIH
IIL
IIH
VOL1
—
2.0
–120
—
—
Reset time
Reset terminal
leakage current
Power on time
Clock off reset time
Reset pulse low-level time
Reset pulse high-level time
IOH1
IOH3
ton
toff
tRL
tRH
—
—
80
60
40
50
5.00
5.00
—
—
75
—
–0.6
—
—
–60
1.8
—
—
—
130
130
80
100
Max
12
5.25
5.30
+50
+100
—
2.0
—
Unit Test Conditions
mA VCC = 17.5 V (No load),
with PNP transistor
V VCC = 6 to 17.5 V, Iout = 0.5 A
V VCC = 6 to 17.5 V, Iout = 1 A
mV VCC = 6 to 17.5 V, Iout = 1 A
mV Iout = 10 mA to 0.5 A
dB ei = 0.5 Vrms, fi = 1 kHz
A RSC = 0.2 Ω
mV/°C
0.8 V
—V
— µA VIL = 0 V
3.0 mA Vout = 5 V, VIH = 5 V
0.4 V
IOL = 2 mA
5.0 µA
30 µA
200 ms
220 ms
160 ms
200 ms
VOH = 5 V
VOH = 17.5 V
Rf = 300 kΩ, RR = 560 kΩ,
Cf = 0.01 µF, CR = 0.1 µF
5
5 Page 
HA1835P/HA1848P
5k
Ta = 25°C
VIN = 12 V
2k
1k
500
Allowable operation
clock pulse duty
cycle
200
AB
100
Duty = B
A+B
50
30
0 20 40 60 80 100
Clock pulse duty cycle (%)
Figure 7 Clock Pulse Frequency vs. Clock Pulse Duty Cycle
20 k
Ta = 25°C
VIN = 12 V
Duty = 50%
10 k
5k
System run-away
sense region
2k
1k
500
Normal operation region
200
100
50
System run-away
sense region
20
100 k
200 k
500 k
Resistor Rf (Ω)
Figure 8 Clock Pulse Frequency vs. Resistor
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet HA1848P.PDF ] | |
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