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X1288 Datasheet, PDF (1/31 Pages) Xicor Inc. – 2-Wire RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM | |||
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Preliminary Information
New Features
Repetitive Alarms &
Temperature Compensation
2-Wire⢠RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM
X1288
FEATURES
⢠Real Time Clock/Calendar
â Tracks time in Hours, Minutes, Seconds and Hun-
dredths of a Second
â Day of the Week, Day, Month, and Year
⢠2 Polled Alarms (Non-volatile)
â Settable on the Second, Minute, Hour, Day of the
Week, Day, or Month
â Repeat Mode (periodic interrupts)
⢠Oscillator Compensation on chip
â Internal feedback resistor and compensation
capacitors
â 64 position Digitally Controlled Trim Capacitor
â 6 digital-frequency adjustment setting to ±30ppm
⢠CPU Supervisor Functions
â Power On Reset, Low Voltage Sense
â Watchdog Timer (SW Selectable: 0.25s, 0.75s,
1.75s, off)
⢠Battery Switch or Super Cap Input
⢠32K x 8 Bits of EEPROM
â 128-Byte Page Write Mode
â 8 modes of Block Lock⢠Protection
â Single Byte Write Capability
⢠High Reliability
âData Retention: 100 years
âEndurance: 100,000 cycles per byte
⢠2-Wire⢠Interface interoperable with I2C*
â 400kHz data transfer rate
⢠Frequency Output (SW Selectable: Off, 1Hz, 100Hz,
or 32.768kHz)
⢠Low Power CMOS
â 1.25µA Operating Current (Typical)
⢠Small Package Options
â 16-Lead SOIC and 14-Lead TSSOP
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
⢠Ofï¬ce Automation (Copiers, Fax)
⢠Home Appliances
⢠Computer Products
⢠Other Industrial / Medical / Automotive
BLOCK DIAGRAM
X1
32.768kHz
X2
PHZ/IRQ
Select
SCL
SDA
Serial
Interface
Decoder
RESET
Control
Decode
Logic
8
OSC
Compensation
Oscillator
Frequency 1Hz
Divider
Timer
Calendar
Logic
Control/
Registers
(EEPROM)
Status
Registers
(SRAM)
Alarm
Watchdog
Timer
Low Voltage
Reset
Time
Keeping
Registers
(SRAM)
Compare
Alarm Regs
(EEPROM)
256K
EEPROM
ARRAY
Battery
Switch
Circuitry
VCC
VBACK
*I2C is a Trademark of Philips.
REV 1.1.30 3/24/04
www.xicor.com
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