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