The X1226 is a real-time clock with a clock calendar, two alarms, 512 8-bit EEPROM, oscillator compensation and battery switchover. The oscillator uses an external low-cost 32.768Khz crystal. All compensation and adjustment components are integrated on the chip, thus eliminating external discrete components and an adjustment capacitor, saving printing space and component costs. The real-time clock uses separate hour, minute and second registers to track time. The calendar has separate date, week, month and year registers. The calendar can be correct through the year 2099 with automatic leap year correction. The powerful dual alarm function can be set to any clock calendar value to match the alarm. For example, every minute, every Tuesday or March 21st at 5:23 am can alarm. The alarm can be queried in the status register or provide a hardware interrupt IRQ pin. This is a repeating mode alarm that allows a periodic interrupt to be generated. The PHZ/IRQ pin can be software selected to output any frequency of 1 Hz, 4096 Hz or 32,768 Hz. The device provides a backup power input pin VBACK, which allows the device to be backed up by a battery or large-capacity capacitor. The operating voltage range of the X1226 device is 2.7 V to 5.5V The clock calendar part of X1226 can operate down to 1.8V (standby mode) X1226 device provides 4Kbit EEPROM 8 blocks with lock control can be used as a large amount of user data storage memory with security and confidentiality. This memory is not affected when both the main power supply and the backup power supply fail.
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