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.

特性 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