X1205

Preliminary Information New Features Repetitive Alarms & Temperature Compensation X1205 Real Time Clock/Calendar 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 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 APPLICATIONS Utility Meters HVAC Equipment Audio / Video Components Set Top Box / Television 2-Wire™ RTC DESCRIPTION IM Oscillator BLOCK DIAGRAM PR EL OSC Compensation Frequency Divider 1Hz Timer Calendar Logic 32.768kHz X1 X2 IN Status Registers (SRAM) Alarm The X1205 device is a Real Time Clock with clock/ calendar, two polled alarms, 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. The Real-Time Clock keeps track of time with separate...