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ISL12020MIRZ Datasheet(PDF) 1 Page - Intersil Corporation |
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ISL12020MIRZ Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 34 page 1 Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature Compensation and Auto Daylight Saving ISL12020M The ISL12020M 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 DFN 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. The RTC tracks time with separate registers for hours, minutes, and seconds. The calendar registers track date, month, year and day of the week and are accurate through 2099, with automatic leap year correction. Daylight Savings time adjustment is done automatically, using parameters entered by the user. Power fail and battery monitors offer user-selectable trip levels. The time stamp function records the time and date of switchover from VDD to VBAT power, and also from VBAT to VDD power. Related Literature •See AN1549 “Addressing Power Issues in Real Time Clock Applications” Features • Embedded 32.768kHz Quartz Crystal in the Package • 20 Ld DFN Package (for SOIC version, refer to the ISL12022M) •Calendar • On-chip Oscillator Temperature Compensation • 10-bit Digital Temperature Sensor Output • 15 Selectable Frequency Outputs • Interrupt for Alarm or 15 Selectable Frequency Outputs • Automatic Backup to Battery or Supercapacitor • VDD and Battery Status Monitors • Battery Reseal™ Function to Extend Battery Shelf Life • Power Status Brownout Monitor • Time Stamp for Battery Switchover • 128 Bytes Battery-Backed User SRAM •I2C-Bus™ • RoHS Compliant Applications • Utility Meters •POS Equipment • Printers and Copiers • Digital Cameras ISL12020M 3.3V C1 0.1µF BAT54 SDA SCL GND VDD BATTERY 3.0V C2 0.1µF SCHOTTKY DIODE 1 2 3 4 5 6 7 8 9 10 X2 X2 X2 X2 X2 NC VBAT GND NC NC 11 12 13 14 15 16 17 18 19 20 SDA SCL VDD NC X1 X1 X1 X1 X1 R1 10k R2 10k R3 10k IRQ/FOUT IRQ/FOUT MCU INTERFACE FIGURE 1. TYPICAL APPLICATION CIRCUIT CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2008-2011. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. I2C Bus™ is a trademark owned by NXP Semiconductors Netherlands, B.V. All other trademarks mentioned are the property of their respective owners. December 13, 2011 FN6667.5 |
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