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ISL12026, ISL12026A
Real Time Clock/Calendar with I2C Bus
and EEPROM
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
ISL12026, ISL12026A
(8 LD TSSOP)
TOP VIEW
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
X1
X2
VBAT
VDD
IRQ/FOUT
SCL
SDA
GND
1
2
3
4
7
8
6
5
X1
X2
VBAT
VDD
IRQ/FOUT
SCL
SDA
GND
1
2
3
4
7
8
6
5
Data Sheet
FN8231.9
November 30, 2010
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. 2005, 2006, 2007, 2008, 2010. All Rights Reserved.
Intersil (and design) and BlockLock are trademarks 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.
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