DS1259

Battery Manager Chip

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Overview

Facilitates uninterruptible power
Uses battery only when primary V_CC is not available
Low forward voltage drop
Power fail signal interrupts processor or write protects memory
Consumes less than 100nA of battery current
Low battery warning signal
Battery can be electrically disconnected upon command
Battery will automatically reconnect when V_CC is applied
Mates directly with DS1212 Nonvolatile Controller x 16 Chip to back up 16 RAMs
Optional 16-pin SOIC surface-mount package

The DS1259 Battery Manager Chip is a low-cost battery management system for portable and nonvolatile electronic equipment. A battery connected to the battery input pin supplies power to CMOS electronic circuits when primary power is lost through an efficient switch via the V_CCO pins. When power is supplied from the battery, the power-fail signal is active to warn electronic reset circuits of the power status. Energy loss during shipping and handling is avoided by pulsing reset, thereby causing the battery to be isolated from other elements in the circuits.