Real Time Clock/Calendar/CPU Supervisor With EEPROM
The X1286 device is a Real Time Clock with Clock calendar, two polled alarms with integrated 32kx8 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.
The Real-Time Clock keeps track of time with separate Registers for Hours, Minutes, Seconds and 1/100 of a second. The Calendar has separate Registers for Date, Month, Year and Day-of-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, 100 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 X1286 device is fully operational from 2.7 to 5.5 volts and the Clock calendar portion of the X1286 device remains fully operational down to 1.8 volts (Standby Mode).
The X1286 device provides 256K 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.
By Intersil Corporation
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