Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature Compensation, and Auto Daylight Saving

The ISL12022M device is a low power real time clock (RTC) with an embedded temperature sensor and crystal. Device functions include oscillator compensation, clock/calendar, power fail and low battery monitors, brownout indicator, one-time, periodic or polled alarms, intelligent battery backup switching, Battery Reseal™ function and 128 bytes of battery-backed user SRAM. The device is offered in a 20 Ld SOIC module that contains the RTC and an embedded 32.768kHz quartz crystal. The calibrated oscillator provides less than ±5ppm drift over the full -40°C to +85°C temperature range.

Features

• Embedded 32.768kHz Quartz Crystal in the Package

• 20 Ld SOIC Package (for DFN version, refer to the ISL12020M)

• Real Time Clock/Calendar

- Tracks Time in Hours, Minutes and Seconds

- Day of the Week, Day, Month and Year

• On-chip Oscillator Temperature Compensation

- ±5ppm Accuracy Over -40°C to +85°C

• 10-bit Digital Temperature Sensor Output - ±2°C Accuracy

• Customer Programmable Day Light Saving Time

• 15 Selectable Frequency Outputs

• 1 Alarm

- Settable to the Second, Minute, Hour, Day of the Week, Day, or Month

- Single Event or Pulse Interrupt Mode

• Automatic Backup to Battery or Supercapacitor

- Operation to VBAT = 1.8V

- 1.0µA Battery Supply Current

• Battery Status Monitor

- 2 User Programmable Levels

- Seven Selectable Voltages for Each Level

• Battery Reseal™ Function to Extend Battery Shelf Life

• Power Status Brownout Monitor

- Six Selectable Trip Levels, from 2.295V to 4.675V

• Oscillator Failure Detection

• Time Stamp for First VDD to VBAT, and Last VBAT to VDD Switchover

• 128 Bytes Battery-Backed User SRAM

• I2C-Bus™

- 400kHz Clock Frequency

• Pb-Free (RoHS Compliant)

Applications

• Utility Meters

• POS Equipment

• Medical Devices

• Printers and Copiers

• Digital Cameras

• Security Systems

• Vending Machine