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

 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 (R

 Alternative between RES and RES output