DATASHEETISL12029, ISL12029A
Real Time Clock/Calendar with
I2C
Bus™
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FN6206
Rev 1.00
December 16, 2010
The ISL12029 device is a low power real time clock with
clock/calendar, power-fail indicator, clock output and crystal
compensation, two periodic or polled alarms (open drain
output), intelligent battery backup switching, CPU
Supervisor, 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 ISL12029 and ISL12029A Power Control Settings are
different. The ISL12029 uses the Legacy Mode Setting, and
the ISL12029A uses the Standard Mode Setting.
Applications that have VBAT > VDD will require only the
ISL12029A. Please refer to “Power Control Operation” on
page 14 for more details. Also, please refer to “I2C
Communications During Battery Backup” on page 24 for
important details.
Pinout
ISL12029, ISL12029A
(14 LD TSSOP, SOIC)
TOP VIEW
X1
X2
NC
NC
NC
RESET
GND
1
2
3
4
5
6
7
14 VDD
13 VBAT
12 IRQ/FOUT
11 NC
10 NC
9 SCL
8 SDA
NC = No internal connection
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
- Power Failure Detection
- 800nA Battery Supply Current
• 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
- Data Retention: 50 years
- Endurance: >2,000,000 Cycles Per Byte
• CPU Supervisor Functions
- Power-On Reset, Low Voltage Sense
- Watchdog Timer (0.25s, 0.75s, 1.5s)
• I2C Interface
- 400kHz Data Transfer Rate
• 14 Ld SOIC and 14 Ld TSSOP Packages
• Pb-Free (RoHS Compliant)
Applications
• Utility Meters
• HVAC Equipment
• Audio/Video Components
• 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/AutomotivePAR
FN6206 Rev 1.00
December 16, 2010
Page 1 of 29
