actual size real time clock module block diagram ? ? ? ? overview ? ? clock and calendar timer register alarm register fout controller control register and system controller divider interrupts controller bus interface circuit osc 32.768 khz fout foe / airq d i / tirq do clk ce1 ce0 ram 128 bit ( 8 bit ? 16 ) ?? built-in sram ? include 128 ? bit ? ( ? 8 ? bit ??? 16 ? ) ? ram. ?? interface type ? serial interface in 4 lines form. ?? it is possible to make it to 3 lines by wired-or connecting di and do pins. ?? 32.768 khz frequency output function ? fout pin output (c-mos output), cl=30 pf ? foe pin enables output on/off control. ?? timer function ? timer function can be set up between 1/4096 second and 4095 minutes. ? it is recorded automatic to tf-bit at the time of event occurrence,and possible to output with /tirq pin output (open-drain output). ?? interrupt function ? alarm interrupt function , and timer interrupt function. pin function ? ? ? ? terminal connectio n ? / external dimensi o n s ? ? (unit:mm) ? ? signal name input/output function ce0 input the chip enabled input pin 0. ( it has a built -in pull-down resistance ) ce1 input the chip enabled input pin 1. ( ? it does not have a built -in pull-down resistance ? ) ? clk input the shift clock input pin for serial data transfer. di input the data input pin for serial data trasfer. do output the data output pin for serial data trasfer. fout output this pin outputs the reference clock signal at 32.768 khz ( cmos output ). high impedance at the time of output off. foe input the input pin for the fout output control. / airq output the open drain output pin for alarm and time update interrupts. / tirq output the open drain output pin for timer interrupt. v dd - connected to a positive power supply. gnd - connected to a ground. ??????? ? rx ? ? ? 4581 ? nb 1. gnd 22. n.c. 2. ce1 21. n.c. 3. ce0 20. n.c. 4. di 19. n.c. 5. do 18. n.c. 6. clk 17. n.c. 7. / ? tirq 16. n.c. 8. / ? airq 15. n.c. 9. foe 14. n.c. 10. fout 13. ??? 11. v dd 4.8 6.3 ? max. 5.0 ??? 0.2 0.5 1.3 ??? 0.1 ? 12. ??? ?? son ??? 22 pin the metal case inside of the molding compound may be exposed on the top or bottom of this product. this purely cosmetic and does not have any effect on quality, reliability or electrical specs. s p ecifications ( characteristics ) * ? refer to a pp lication manual for details. ? ? recommended operating conditions item symbol conditions min. typ. max. unit power voltage v dd - 1.6 3.0 5.5 v clock voltage v clk - 1.6 3.0 5.5 v operating temperature t opr - -40 +25 +85 ? c ? ? frequency characteristics item symbol conditions rating unit frequency tolerance ?? f ? / ? f t a ? = ? +25 ?? c v dd ? = ? 3.0 ? v ?? b: 5 ??? 23 ? ? ?? 10 ? 6 oscillation start-up time t sta t a ? = ? +25 ?? c v dd ? = ? 3.0 ? v 3 ?? max. s ?? please ask for tighter tolerance. ( equivalent to 1 minute of monthly deviation) ? ? current consumption characteristics ? t a ? = ? -40 ?? c ? to ? +85 ?? c item symbol conditions min. typ. max. unit current consumption i bk ce0, ? ce1 ? = ? gnd foe ? = ? gnd fout ? ; output off ? ( ? hi ? - ? z ? ) v dd ? = ? 5 ? v ? - 0.6 1.2 ? a v dd ? = ? 3 ? v ? - 0.4 0.8 i 32k ce0, ? ce1 ? = ? gnd foe ? = ? v dd fout ? ; 32.768 ? khz output on cl ? = ? 30 ? pf v dd ? = ? 5 ? v ? - 8.0 20.0 ? a v dd ? = ? 3 ? v ? - 5.0 12.0 real time clock module (spi-bus) built-in sram rx - 4581 ? nb ? built in frequency adjusted 32.768 khz crystal unit. ? interface type : 4-wire serial interface ? operating voltage range : 1.6 ? v ? to ? 5.5 ? v ? wide timekeeper voltage range : 1.6 ? v ? to ? 5.5 ? v ? low backup current : 0.4 ?? a ?? / ?? 3 ? v ? ( ? typ. ? ) ? ? built-in sram : built-in 128 ? bit ? ( ? 8 ? bit ??? 16 ? ) ? ram. ? 32.768 khz frequency output function : c-mos output with control pin ? the various functions include full calendar, alarm, timer. product number (please contact us) RX-4581NB : q41458192000200
promotion of environm ental management system conforming to international standards at seiko epson, all environmental initiatives operate under the plan-do-check-action (pdca) cycle designed to achieve continuous improvements. the environmental management system (ems) operates under the iso 14001 environmental management standard. all of our major manufacturing and non-manufacturing sites, in japan and overseas, completed the acquisition of iso 14001 certification. working for high quality in order provide high quality a nd reliable products and services than meet customer needs, seiko epson made early efforts towards obtaining iso9000 series certification and has acquired iso9001 for all business establishments in japan and abroad. we have also acquired iso/ts 16949 certification that is requested strongly by major automotive manufacturers as standard. ? explanation of the mark that are using it for the catalog ? pb free. ? complies with eu rohs directive. *about the products without the pb-free mark. contains pb in products exempted by eu rohs directive. (contains pb in sealing glass, high melting temperature type solder or other.) ? designed for automotive applications such as car multim edia, body electronics, remote keyless entry etc. ? designed for automotive applications related to drivi ng safety (engine control unit, air bag, esc etc ). seiko epson corporation notice ? this material is subjec t to change without notice. ? any part of this material may not be reproduced or duplicated in any form or any means without the written permission of seiko epson. ? the information about applied circuitry, software, usage, etc. wr itten in this material is intended for reference only. seiko epson does not assume any liability for the occurrence of infringing on any pat ent or copyright of a third party. this material does not a uthorize the licensing for any patent or intellectual copyrights. ? when exporting the products or technology described in this material, you should comp ly with the applicable export control law s and regulations and follow the procedures r equired by such laws and regulations. ? you are requested not to use the products (and any technical information furnished, if any) for the development and/or manufac ture of weapon of mass destruction or for other milit ary purposes. you are also requested that you would not make the products availabl e to any third party who may use the products for such prohibited purposes. ? these products are intended for general use in electronic equipment. when using them in s pecific applications that require ext remely high reliability, such as the applications stated below, y ou must obtain permission from seiko epson in advance. / space equipment (artificial satellites, rockets, etc.) / trans portation vehicles and related ( automobiles, aircraft, trains, vessels, etc.) / medical instruments to sustain life / submari ne transmitters / power stations and related / fire work equipmen t and security equipment / traffic control equipment / and others requiring equivalent reliability. ? all brands or product names mentioned herein are trademar ks and/or registered trademarks of their respective. iso 14000 is an international standard for environmental management that was established by the international standards organization in 1996 against the background of growing concern regarding global warming, destruction of the ozone layer, and global deforestation. iso/ts16949 is the international standard that added the sector-specific supplemental requirements for automotive industry based on iso9001.
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