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BQ4847,bq4847Y,pdf(RTC Module)
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The bq4847 Real-Time Clock Module is a low-power microprocessor peripheral that integrates a time-of-day clock, a 100-year calendar, a CPU supervisor, a battery, and a crystal in a 28-pin DIP module. The part is ideal for fax machines, copiers, industrial control systems, point-of-sale terminals, data loggers, and computers.
The bq4847 contains an internal battery and crystal. Through the use of the conditional chip enable output (CE\OUT) and battery voltage output (VOUT) pins, the bq4847 can write-protect and make nonvolatile an external SRAM. The backup cell powers the real-time clock and maintains SRAM information in the absence of system voltage.
The bq4847 contains a temperature-compensated reference and comparator circuit that monitors the status of its voltage supply.
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