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HA1848P Datasheet

Part Number HA1848P
Manufacturers Hitachi Semiconductor
Logo Hitachi Semiconductor
Description Watchdog Timer
Datasheet HA1848P DatasheetHA1848P Datasheet (PDF)

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; V CC = 6 V to 30 V  Available external PNP-type transistor, suited to.

  HA1848P   HA1848P






Watchdog Timer

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; V CC = 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 HA1835P/HA1848P Pin Arrangement RR CR P-RUN Rf Cf Vout GND 1 2 3 4 5 6 7 14 13 12 11 10 9 8 RES RES CS VCC VCONT Comp * Vadj (Top View) Note: HA1848P: 9 pin is non connection. Pin Functions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Symbol RR CR P-RUN Rf Cf Vout GND Vadj Comp VCONT VCC CS RES * RES * Functions Reset pulse width depends on resistance connected to RR Recommended range: 100 k Ω to 1 M Ω Reset pulse width depends on cap.


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