ISL12023 Datasheet, PDF (1/28 Pages) Intersil Corporation – Low Power RTC with Battery-Backed SRAM and Embedded Temp Compensation ±5ppm with Auto Daylight Saving

ISL12023
®
Real Time Clock with On Chip Temp Compensation ±5ppm
Data Sheet
June 24, 2009
FN6682.2
Low Power RTC with Battery-Backed SRAM
and Embedded Temp Compensation ±5ppm
with Auto Daylight Saving
The ISL12023 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 V_DD to
V_BAT power, and also from V_BAT to V_DD power.
Pinout
ISL12023
(14 LD TSSOP)
TOP VIEW
NC 1
X1 2
X2 3
V_BAT
4
GND 5
LVRST 6
NC 7
14 NC
13
V_DD
12 IRQ
11 SCL
10 SDA
9
F_OUT
8 NC
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
Temp Range
- ±5ppm Over -40°C to +85°C
• 10-bit Digital Temperature Sensor Output
- ±2°C Accuracy
• Customer Programmable Day Light Saving Time
• Clock Output with 15 Selectable Frequencies
• 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 V_BAT = 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 V_DD to V_BAT, and Last V_BAT to V_DD
• 128 Bytes Battery-Backed User SRAM
• Separate F_OUT, IRQ, and LVRST Outputs
• I²C Bus™
- 400kHz Clock Frequency
• 14 Ld TSSOP Package
• Pb-Free (RoHS Compliant)
Applications
• Utility Meters
• POS Equipment
• Medical Devices
• Security Systems
• Vending Machines
• White Goods
• Printers and Copiers
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
I²C Bus™ is a trademark owned by NXP Semiconductors Netherlands, B.V.
Copyright Intersil Americas Inc. 2008, 2009. All Rights Reserved
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