ISL12022

Low Power RTC with Battery-Backed SRAM and Embedded Temp Comp ±5ppm with Auto Day Light Saving

OVERVIEW

The ISL12022 device is a low power real time clock with an embedded Temp sensor for oscillator compensation, clock/calendar, power fail, low battery monitor, brownout indicator, single periodic or polled alarms, intelligent battery-backup switching, Battery Reseal™ function and 128 bytes of battery-backed user SRAM.

The oscillator uses an external, low-cost 32.768kHz crystal. The real time clock tracks time with separate registers for hours, minutes, and seconds. The device has calendar registers for date, month, year and day of the week. The calendar is 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. A time stamp function records the time and date of switchover from VDD to VBAT power, and also from VBAT to VDD power.

KEY FEATURES

  • Real Time Clock/Calendar
  • Tracks Time in Hours, Minutes and Seconds
  • Day of the Week, Day, Month and Year
  • On-chip Oscillator Compensation Over the Operating Temperature Range
  • ±5ppm 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
  • Battery Reseal™ Function to Extend Battery Shelf Life
  • Automatic Backup to Battery or Super Capacitor
  • Operation to VBAT = 1.8V
  • 1.0µA Battery Supply Current
  • Battery Status Monitor
  • 2 User Programmable Levels
  • Seven Selectable Voltages for Each Level
  • 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
  • 128 Bytes Battery-Backed User SRAM
  • I2C Bus™
  • 400kHz Clock Frequency
  • 1µA Typical Battery Current
  • Pb-Free (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL12022
Basic Information
Production Status
Mass Production
Supply Voltage Vcc (Min) (V)
2.7
Supply Voltage Vcc (Max) (V)
5.5
VBAT (min)
1.8 V
VBAT (max)
5.5 V
IBAT (nA)
1000
Accuracy
±5 ppm
Alarms
1
Crystal Frequency Trimming
Yes
Selectable Frequency Output
15
CPU Supervisory Function POR
No
CPU Supervisory Function Watchdog Timer
No
Battery Seal
Yes
Battery Backup
Yes
VTRIP for POR
6 Select VTRIP Levels
IRQ_Bar
IRQ_bar/FOUT
FOUT
IRQ_bar/FOUT
RESET_bar
No
Oscillator Compensation (ppm)
-336 to +337
SRAM
128 Bytes
Other Functions
Battery Switchover Time Stamp,
Battery Status Monitor, Brown-out Alarm, Daylight Savings
Memory Type
RAM
Bus/Output Interface
I2C
Time Keeping Current
3.5 µA
IRQ Pin
Yes
Freq. Out Pin
Yes
Timer
No
Tamper Detect
No
Reset
No
Qualification Level
Standard
Battery Voltage Range (V)
1.8 to 5.5
Supply Voltage Vcc Range (V)
2.7 to 5.5
Can Sample
YES
Temperature Range
-40 to +85

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