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