ISL12022 FN6659 Rev.3.01 Low Power RTC with Battery-Backed SRAM and Embedded Temp Compensation Oct 24, 2019 5ppm with Auto Daylight Saving The ISL12022 device is a low power real time clock with an Features embedded Temp sensor for oscillator compensation, Real Time Clock/Calendar clock/calendar, power fail, low battery monitor, brownout - Tracks Time in Hours, Minutes and Seconds indicator, single periodic or polled alarms, intelligent battery-backup switching, Battery Reseal function, and - Day of the Week, Day, Month, and Year 128 bytes of battery-backed user SRAM. On-chip Oscillator Compensation Over the Operating Temperature Range The oscillator uses an external, low-cost 32.768kHz crystal. The real time clock tracks time with separate registers for - 5ppm Over -40C to +85C hours, minutes, and seconds. The device has calendar 10-bit Digital Temperature Sensor Output registers for date, month, year, and day of the week. The - 2C Accuracy calendar is accurate through 2099, with automatic leap year Customer Programmable Day Light Saving Time correction. 15 Selectable Frequency Outputs Daylight Savings time adjustment is done automatically, using parameters entered by the user. Power fail and battery 1 Alarm monitors offer user-selectable trip levels. A time stamp - Settable to the Second, Minute, Hour, Day of the Week, function records the time and date of switchover from V to Day, or Month DD V power, and also from V to V power. BAT BAT DD - Single Event or Pulse Interrupt Mode Battery Reseal Function to Extend Battery Shelf Life Applications Automatic Backup to Battery or Super Capacitor Utility Meters -Operation to V = 1.8V BAT POS Equipment - 1.0A Battery Supply Current Medical Devices Battery Status Monitor Security Systems - 2 User Programmable Levels Vending Machines - Seven Selectable Voltages for Each Level White Goods Power Status Brownout Monitor - Six Selectable Trip Levels, from 2.295V to 4.675V Printers and Copiers Oscillator Failure Detection Related Literature Time Stamp for First V to V , and Last V to V DD BAT BAT DD For a full list of related documents, visit our website 128 Bytes Battery-Backed User SRAM ISL12022 device page 2 I C Bus - 400kHz Clock Frequency 1A Typical Battery Current Pb-Free (RoHS Compliant) D BAT V = 2.7V DD ISL12022 J BAT BAT43W TO 5.5V VDD VBAT + V = 1.8V BAT C IN TO 3.2V C BAT 0.1F 0.1F GND FIGURE 1. TYPICAL APPLICATION CIRCUIT FN6659 Rev.3.01 Page 1 of 32 Oct 24, 2019ISL12022 Control and Status Registers (CSR) . 15 Table of Contents Addresses 07h to 0Fh 15 Block Diagram 3 Status Register (SR) . 15 Interrupt Control Register (INT) 16 Ordering Information 3 V Brownout Trip Voltage BITS (V Trip<2:0) 17 DD DD Pin Configuration 4 Battery Voltage Trip Voltage Register (PWR VBAT) . 17 Initial AT and DT Setting Register (ITRO) 17 Pin Descriptions . 4 BETA Register (BETA) . 19 Final Analog Trimming Register (FATR) . 20 Absolute Maximum Ratings . 5 Final Digital Trimming Register (FDTR) . 20 Thermal Information . 5 ALARM Registers (10h to 15h) 21 Time Stamp VDD to Battery Registers (TSV2B) 22 DC Operating Characteristics - RTC 5 Time Stamp Battery to VDD Registers (TSB2V) 22 Power-Down Timing 6 DST Control Registers (DSTCR) 22 2 TEMP Registers (TEMP) 23 C Interface Specifications 6 I NPPM Registers (NPPM) . 23 SDA vs SCL Timing . 8 XT0 Registers (XT0) . 24 ALPHA Hot Register (ALPHAH) 24 Symbol Table 8 User Registers (Accessed by Using Slave Address Typical Performance Curves 9 1010111x) . 25 Addresses 00h to 7Fh 25 General Description 10 2 I C Serial Interface 25 Pin Descriptions 10 Protocol Conventions 25 X1, X2 . 10 V . 10 BAT Device Addressing . 26 IRQ/F (Interrupt Output/Frequency Output) 10 OUT Serial Clock (SCL) 11 Write Operation 26 Serial Data (SDA) 11 Read Operation 26 V , GND 11 DD Functional Description 11 Application Section 26 Power Control Operation 11 Power Supply Considerations . 26 Normal Mode (V ) to Battery-Backup Mode (V ) 11 Battery-Backup Details 26 DD BAT Battery-Backup Mode (V ) to Normal Mode (V ) 11 Oscillator Crystal Requirements . 27 BAT DD Power Failure Detection 11 Layout Considerations . 27 Brownout Detection 12 Applications Information . 28 Battery Level Monitor 12 Crystal Oscillator Frequency Compensation . 28 Real Time Clock Operation .12 Measuring Oscillator Accuracy 28 Single Event and Interrupt 12 Temperature Compensation Operation . 29 Frequency Output Mode 12 Daylight Savings Time (DST) Example 29 General Purpose User SRAM 12 2 Revision History . 30 I C Serial Interface 12 Oscillator Compensation 12 Package Outline Drawing . 31 Register Descriptions .13 Real Time Clock Registers .15 Addresses 00h to 06h 15 FN6659 Rev.3.01 Page 2 of 32 Oct 24, 2019