DATASHEET
ISL12026, ISL12026A
Real Time Clock/Calendar with I2C Bus™ and EEPROM
FN8231
Rev 9.00
November 30, 2010
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 “I2C Communications During Battery Backup”
on page 22 for important details.
Pinouts
ISL12026, ISL12026A
(8 LD SOIC)
TOP VIEW
X1
X2
IRQ/FOUT
GND
1
2
3
4
8 VDD
7 VBAT
6 SCL
5 SDA
ISL12026, ISL12026A
(8 LD TSSOP)
TOP VIEW
VBAT
VDD
X1
X2
1
2
3
4
8 SCL
7 SDA
6 GND
5 IRQ/FOUT
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)
Applications
• Utility Meters
• HVAC Equipment
• Audio/Video Components
• Set-Top Box/Television
• Modems
• Network Routers, Hubs, Switches, Bridges
• Cellular Infrastructure Equipment
• Fixed Broadband Wireless Equipment
• Pagers/PDA
• POS Equipment
• Test Meters/Fixtures
• Office Automation (Copiers, Fax)
• Home Appliances
• Computer Products
• Other Industrial/Medical/Automotive
FN8231 Rev 9.00
November 30, 2010
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