Low Power RTC with Battery Backed SRAM and 50/60 Cycle AC Input and Xtal Back-up The ISL12032 device is a low power real time clock with 50/60 AC input for timing synchronization. It also has an oscillator utilizing an external crystal for timing back-up, clock/calendar registers, intelligent battery back-up switching, battery voltage monitor, brownout indicator, integrated trickle charger for super capacitor, single periodic or polled alarms, POR supervisory function, and up to 4 Event Detect with time stamp. There are 128 bytes of battery-backed user SRAM. Features • 50/60 Cycle AC as a Primary Clock Input for RTC Timing • Redundant Crystal Clock Input Selectable by User - Dynamically Switch from AC Clock Input to Crystal in Case of Power Failure • Real Time Clock/Calendar - Tracks Time in Hours, Minutes, Seconds and Tenths of a Second - Day of the Week, Day, Month, and Year • Auto Daylight Saving Time Correction - Programmable Forward and Backward Dates • Security and Event Functions - Event Detection with Time Stamp - Stores First and Last Three Event Time Stamps • Separate FOUT Pin - 7 Selectable Frequency Outputs • Dual Alarms with Hardware and Register Indicators - Hardware Single Event or Pulse Interrupt Mode • Automatic Backup to Battery or Super Capacitor - VBAT Operation Down to 1.8V - 1.0µA Battery Supply Current • Two Battery Status Monitors with Selectable Levels - Seven Selectable Voltages for Each Level - 1st Level, Trip Points from 4.675V to 2.125V - 2nd Level, Trip Points from 4.125V to 1.875V • VDD Power Brownout Monitor - Six Selectable Trip Levels, from 4.675V to 2.295V • Time Stamp during Power-to-Battery and Battery-to-Power Switchover • Integrated Trickle Charger - Four Selectable Charging Rates • 128 Bytes Battery-Backed User SRAM • I2C Interface - 400kHz Data Transfer Rate • Pb-free (RoHS compliant) Applications • Utility Meters • Control Applications • Security Related Applications • Vending Machines • White Goods • Consumer Electronics
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