Dallas Semiconductor

DS1259 - Battery Manager Chip

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Features Facilitates uninterruptible power Uses battery only when primary Vcc 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 Mates directly with DS1212 Nonvolatile Controller x 16 Chip to back up 16 RAMs

Pin Description Pin Number Description 1 NC - Not Connected 2 Vbat - Battery Input Connection 3 BF - Battery Fail Output Signal 4 NC - Not Connected 5 BAT - Battery Output 6 RST - Reset Input 7 GND - Ground 8 GND - Ground 9 NC - Not Connected 10 NC - Not Connected 11 PF - Power Fail Output Signal 12 Vcco - RAM Supply 13 Vcco - RAM Supply 14 NC - Not Connected 15 Vcci - +5V Supply 16 Vcci - +5V Supply

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Technical Data Data Sheet Dallas Semiconductor - Data Sheet for DS1259 Application Notes