Low Power RTC with Battery Backed SRAM and 50/60 Cycle AC Input and Crystal 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