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BQ4842Y,pdf(RTC Module)
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The bq4842Y RTC Module is a non-volatile 1,048,576-bit SRAM organized as 131,072 words by 8 bits with an integral accessible real-time clock and CPU supervisor. The CPU supervisor provides a programmable watchdog timer and a microprocessor reset. Other features include alarm, power-fail, and periodic interrupts, and a battery-low warning.
The device combines an internal lithium battery, quartz crystal, clock and power-fail chip, and a full CMOS SRAM in a plastic 32-pin DIP module. The RTC Module directly replaces industry-standard SRAMs and also fits into many EPROM and EEPROM sockets without any requirement for special write timing or limitations on the number of write cycles.
Registers for the real-time clock, alarm and other special functions are located in registers 1FFF0h\x96 1FFFFh of the memory array.
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