ISL12026

Real Time Clock/Calendar with I<sup>2</sup>C Bus™ and EEPROM

OVERVIEW

The ISL12026 and the ISL12026A devices are micro power real time clocks with timing and crystal compensation, clock/calender, power-fail indicator, two periodic or polled alarms, intelligent battery backup switching, and integrated 512x8-bit EEPROM configured in 16 Bytes per page.

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.

The ISL12026 and ISL12026A have different types of Power Control Settings. The ISL12026 uses the Legacy Mode Setting, which follows conditions set in X1226 products. The ISL12026A uses the Standard Mode Setting. Please refer to "Power Control Operation" on page 13 for more details. Also, please refer to "I2 C Communications During Battery Backup" on page 22 for important details.

KEY FEATURES

  • Real Time Clock/Calendar
  • Tracks Time in Hours, Minutes and Seconds
  • Day of the Week, Day, Month and Year
  • 3 Selectable Frequency Outputs
  • Two Non-Volatile Alarms
  • Settable on the Second, Minute, Hour, Day of the Week, Day or Month
  • Repeat Mode (Periodic Interrupts)
  • Automatic Backup to Battery or SuperCap
  • On-Chip Oscillator Compensation
  • Internal Feedback Resistor and Compensation Capacitors
  • 64 Position Digitally Controlled Trim Capacitor
  • 6 Digital Frequency Adjustment Settings to ±30ppm
  • 512x8 Bits of EEPROM
  • 16-Byte Page Write Mode (32 total pages)
  • 8 Modes of BlockLock™ Protection
  • Single Byte Write Capability
  • High Reliability
  • Data Retention: 50 years
  • Endurance: >2,000,000 Cycles Per Byte
  • I2C Interface
  • 400kHz Data Transfer Rate
  • 800nA Battery Supply Current
  • Package Options
  • 8 Ld SOIC and 8 Ld TSSOP Packages
  • Pb-Free (RoHS Compliant)

PARAMETRICS

Parameters
ISL12026
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)
850
Alarms
2
Crystal Frequency Trimming
Yes
Selectable Frequency Output
3
CPU Supervisory Function POR
No
CPU Supervisory Function Watchdog Timer
No
Battery Seal
Yes
Battery Backup
Yes
IRQ_Bar
IRQ_bar/FOUT
FOUT
IRQ_bar/FOUT
RESET_bar
No
Oscillator Compensation (ppm)
-64 to +110
SRAM
512x8-Bit EEPROM
Memory Type
EEPROM
Bus/Output Interface
I2C
Time Keeping Current
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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