描述:
DESCRIPTION The X1226 device is a Real Time Clock with clock/calendar, two polled alarms with integrated 512x8 EEPROM, oscillator compensation, 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. 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 ? 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 ?? —Data Retention: 100 years ?? —Endurance: 100,000 cycles per byte ? 2-Wire? Interface interoperable with I2C . ?? —400kHz data transfer rate ? Frequency Output (SW Selectable: Off, 1Hz, 4096Hz or 32.768kHz) ? Low Power CMOS ?? —1.25μA Operating Current (Typical) ? Small Package Options ?? —8-Lead SOIC and 8-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 ? Office Automation (Copiers, Fax) ? Home Appliances ? Computer Products ? Other Industrial / Medical / Automotive