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BQ4852Y Datasheet(PDF) 1 Page - Texas Instruments |
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BQ4852Y Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 16 page  Features ® Integrated SRAM, real-time clock, CPU supervisor, crystal, power-fail control circuit, and battery ® Real-Time Clock counts hun- dredths of seconds through years in BCD format ® RAM-like clock access ® Compatible with industry- standard 512K x 8 SRAMs ® Unlimited write cycles ® 10-year minimum data retention and clock operation in the ab- sence of power ® Automatic power-fail chip dese- lect and write-protection ® Watchdog timer, power-on reset, alarm/periodic interrupt, power- fail and battery-low warning ® Software clock calibration for greater than ±1 minute per month accuracy General Description The bq4852Y RTC Module is a non- volatile 4,194,304-bit SRAM organ- ized as 524,288 words by 8 bits with an integral accessible real-time clock and CPU supervisor. The CPU supervisor provides a programmable watchdog timer and a microproces- sor reset. Other features include alarm, power-fail, and periodic inter- rupts, and a battery-low warning. The device combines an internal lith- ium battery, quartz crystal, clock and power-fail chip, and a full CMOS SRAM in a plastic 36-pin DIP mod- ule. The RTC Module directly re- places industry-standard SRAMs and also fits into many EPROM and EE- PROM sockets without any require- ment for special write timing or limi- tations on the number of write cycles. Registers for the real-time clock, alarm and other special functions are located in registers 7FFF0h– 7FFFFh of the memory array. The clock and alarm registers are dual-port read/write SRAM loca- tions that are updated once per sec- ond by a clock control circuit from the internal clock counters. The dual-port registers allow clock up- dates to occur without interrupting normal access to the rest of the SRAM array. The bq4852Y also contains a power- fail-detect circuit. The circuit dese- lects the device whenever VCC falls below tolerance, providing a high de- gree of data security. The battery is electrically isolated when shipped from the factory to provide maxi- mum battery capacity. The battery remains disconnected until the first application of VCC. 1 bq4852Y Aug. 1996 RTC Module With 512Kx8 NVSRAM 1 PN485201.eps 36-Pin DIP Module 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 RST NC A18 A16 A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ1 DQ2 VSS DQ0 VCC NC INT A15 A17 WE A13 A8 A9 A11 OE A10 CE DQ7 DQ5 DQ4 DQ3 DQ6 Pin Names A0–A18 Address input CE Chip enable RST Microprocessor reset WE Write enable OE Output enable DQ0–DQ7 Data in/data out INT Programmable interrupt VCC +5 volts VSS Ground Pin Connections |
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