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X1227 Datasheet

RTC Real TimeClock/Calendar/ CPU Supervisor

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X1227 pdf
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May 8, 2006
X1227
FN8099.2
2-WireRTC Real TimeClock/Calendar/
CPU Supervisor with EEPROM
FEATURES
• Real Time Clock/Calendar
— Tracks Time in Hours, Minutes, and Seconds
— Day of the Week, Day, Month, and Year
• 2 Polled Alarms (Non-volatile)
— Settable on the Second, Minute, Hour, Day of the
Week, Day, or Month
— Repeat Mode (periodic interrupts)
• Oscillator Compensation on Chip
— Internal Feedback Resistor and Compensation
Capacitors
— 64 Position Digitally Controlled Trim Capacitor
— 6 Digital Frequency Adjustment Settings to ±30ppm
• CPU Supervisor Functions
— Power-On Reset, Low Voltage Sense
— Watchdog Timer (SW Selectable: 0.25s, 0.75s,
1.75s, off)
• Battery Switch or Super Cap Input
• 512 x 8 Bits of EEPROM
— 64-Byte Page Write Mode
— 8 Modes of Block Lock™ Protection
— Single Byte Write Capability
• High Reliability
www.DataSheet4U.com — Data Retention: 100 Years
— Endurance: 100,000 Cycles Per Byte
• 2-Wire™ Interface Interoperable with I2C*
— 400kHz Data Transfer Rate
• Low Power CMOS
— 1.25µA Operating Current (Typical)
• Small Package Options
— 8 Ld SOIC and 8 Ld TSSOP
• Repetitive Alarms
• Temperature Compensation
• Pb-Free Plus Anneal Available (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
DESCRIPTION
The X1227 device is a Real Time Clock with
clock/calendar, two polled alarms with integrated 512x8
EEPROM, oscillator compensation, CPU Supervisor
(POR/LVS and WDT) and battery backup switch.
The oscillator uses an external, low-cost 32.768kHz
crystal. All compensation and trim components are
integrated on the chip. This eliminates several external
discrete components and a trim capacitor, saving
board area and component cost.
BLOCK DIAGRAM
OSC
Compensation
32.768kHz
X1
X2
Oscillator
Frequency 1Hz
Divider
Timer
Calendar
Logic
Time
Keeping
Registers
(SRAM)
Battery
Switch
Circuitry
VCC
VBACK
SCL
SDA
Serial
Interface
Decoder
RESET
Control
Decode
Logic
8
Control/
Registers
(EEPROM)
Status
Registers
(SRAM)
Alarm
Watchdog
Timer
Low Voltage
Reset
Compare
Alarm Regs
(EEPROM)
4K
EEPROM
ARRAY
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.
Copyright Intersil Americas Inc. 2005-2006. All Rights Reserved
*I2C is a Trademark of Philips. All other trademarks mentioned are the property of their respective owners.
Intersil Corporation
Intersil Corporation



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