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X1226 Dataheets PDF



Part Number X1226
Manufacturers Xicor
Logo Xicor
Description Real Time Clock/Calendar with EEPROM
Datasheet X1226 DatasheetX1226 Datasheet (PDF)

New Features Repetitive Alarms & Temperature Compensation 4K (512 x 8) X1226 Real Time Clock/Calendar with EEPROM 2-Wire™ RTC 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 .

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New Features Repetitive Alarms & Temperature Compensation 4K (512 x 8) X1226 Real Time Clock/Calendar with EEPROM 2-Wire™ RTC 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 BLOCK DIAGRAM OSC Compensation X1 Frequency Divider 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 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. 32.768kHz X2 Oscillator 1Hz Timer Calendar Logic Time Keeping Registers (SRAM) Battery Switch Circuitry VCC VBACK PHZ/IRQ Select Status Registers (SRAM) Mask SCL SDA Serial Interface Decoder Control Decode Logic Control/ Registers (EEPROM) Alarm Compare Alarm Regs (EEPROM) 4K EEPROM ARRAY 8 *I2C is a Trademark of Philips. REV 1.1.24 1/13/03 www.xicor.com Characteristics subject to change without notice. 1 of 24 X1226 DESCRIPTION (continued) The Real-Time Clock keeps track of time with separate registers for Hours, Minutes, Seconds. The Calendar has separate registers for Date, Month, Year and Dayof-week. The calendar is correct through 2099, with automatic leap year correction. The powerful Dual Alarms can be set to any Clock/ Calendar value for a match. For instance, every minute, every Tuesday, or 5:23 AM on March 21. The alarms can be polled in the Status Register or provide a hardware interrupt (IRQ Pin). There is a repeat mode for the alarms allowing a periodic interrupt. The PHZ/IRQ pin may be software selected to provide a frequency output of 1 Hz, 4096 Hz, or 32,768 Hz. The device offers a backup power input pin. This VBACK pin allows the device to be backed up by battery or SuperCap. The entire X1226 device is fully operational from 2.7 to 5.5 volts and the clock/calendar portion of the X1226 device remains fully operational down to 1.8 volts (Standby Mode). The X1226 device provides 4K bits of EEPROM with 8 modes of BlockLock™ control. The BlockLock allows a safe, secure memory for critical user and configuration data, while allowing a large user storage area. PIN DESCRIPTIONS X1226 8-Pin SOIC X1 X2 1 2 3 4 8 7 6 5 VCC VBACK SCL SDA An open drain output requires the use of a pull-up resistor. The output circuitry controls the fall time of the output signal with the use of a slope controlled pulldown. The circuit is designed for 400kHz 2-wire interface speed. VBACK This input provides a backup supply voltage to the device. VBACK supplies power to the device in the event the VCC supply fails. This pin can be connected to a battery, a Supercap or tied to ground if not used. Programmable Frequency/Interrupt Output – PHZ/IRQ This is either an output from the internal oscillator or an interrupt signal output. It is an open drain output. When used as frequency output, this signal has a frequency of 32.768kHz, 4096Hz, 1Hz or inactive. When used as interrupt output, this signal notifies a host processor that an alarm has occurred and an action is required. It is an active LOW output. The control bits for this function are FO1 and FO0 and are found in address 0011h of the Clock Control Memory map. Refer to “Programmable Frequency Output Bits” on page 6. X1, X2 The X1 and X2 pins are the input and output, respectively, of an inverting amplifier. An external 32.768kHz quartz crystal is used with the X1226 to supply a timebase for the real time clock. The recommended crystal is a Citizen CFS206-32.768KDZF. Internal compensation circuitry is included to form a complete oscillator circuit. Care should be taken in th.


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