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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.

Key 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
• 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
• Low Power CMOS
  • 1.25µA Operating Current (Typical)
• Small Package Options
  • 8 Ld SOIC and 8 Ld TSSOP
• Repetitive Alarms
• Temperature Compensation
• Pb-Free Plus Anneal Available (RoHS Compliant)

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