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X1227

Xicor
Part Number X1227
Manufacturer Xicor
Description Real Time Clock/Calendar/CPU Supervisor with EEPROM
Published Apr 17, 2005
Detailed Description New Features Repetitive Alarms & Temperature Compensation 4K (512 x 8) X1227 APPLICATIONS • • • • • • • • • • • • • • ...
Datasheet PDF File X1227 PDF File

X1227
X1227

Overview
New Features Repetitive Alarms & Temperature Compensation 4K (512 x 8) X1227 APPLICATIONS • • • • • • • • • • • • • • • 2-Wire™ RTC Real Time Clock/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 • 4K x 8 Bits of EEPROM — 64-Byte Page Write Mode — 8 modes of Block Lock™ Protection — Single Byte Write Capability • High Reliability — 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-Lead SOIC and 8-Lead TSSOP 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 ...


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