Real time clock module Product Number (Please contact us) RX-4581NB : Q41458192000200 REAL TIME CLOCK MODULE (SPI-Bus) Built-in SRAM RX - 4581NB Built in frequency adjusted 32.768 kHz crystal unit. Interface Type : 4-wire serial interface Operating voltage range : 1.6V to5.5V Wide Timekeeper voltage range : 1.6V to5.5V Low backup current : 0.4A /3V (Typ.) Built-in SRAM : Built-in 128 bit ( 8 bit 16 ) RAM. Actual size 32.768 kHz frequency output function : C-MOS output With Control Pin The various functions include full calendar, alarm, timer. Block diagram Overview 32.768 kHz Built-in SRAM Include 128 bit(8bit16) RAM. CLOCK DIVIDER and OSC Interface Type CALENDAR Serial interface in 4 lines form. It is possible to make it to 3 lines by wired-OR connecting FOUT FOUT TIMER DI and DO pins. FOE CONTROLLER REGISTER 32.768 kHz frequency output function / AIRQ INTERRUPTS ALARM FOUT pin output (C-MOS output), CL=30 pF / TIRQ CONTROLLER REGISTER FOE pin enables output on/off control. Timer function D I CONTROL Timer function can be set up between REGISTER DO BUS 1/4096 second and 4095 minutes. CLK INTERFACE and It is recorded automatic to TF-bit at the time of event CE1 CIRCUIT occurrence,and possible to output with /TIRQ pin output SYSTEM CE0 (open-drain output). CONTROLLER Interrupt function Alarm interrupt function , and timer interrupt function. RAM 128 bit ( 8 bit 16 ) Pin Function Terminal connection/External dimensions (Unit:mm) RX 4581NB N.C. 1. GND 22. Signal Name Input/Output Function N.C. 2. CE1 21. CE0 Input The chip enabled input pin 0. ( It has a built -in pull-down resistance ) 3. CE0 20. N.C. CE1 Input The chip enabled input pin 1. (It does not have a built -in pull-down resistance ) N.C. 4. DI 19. CLK Input The shift clock input pin for serial data transfer. N.C. 5. DO 18. DI Input The data input pin for serial data trasfer. N.C. 6. CLK 17. 4.8 DO Output The data output pin for serial data trasfer. N.C. 7. 16. /TIRQ N.C. This pin outputs the reference clock signal at 32.768 kHz ( CMOS output ). 8. /AIRQ 15. FOUT Output 1.3 0.1 High impedance at the time of output off. N.C. 9. FOE 14. 10. FOUT 13. FOE Input The input pin for the FOUT output control. 5.0 0.2 11. VDD 12. / AIRQ Output The open drain output pin for alarm and time update interrupts. SON 22 pin / TIRQ Output The open drain output pin for timer interrupt. VDD - Connected to a positive power supply. The metal case inside of the molding compound may be exposed GND - Connected to a ground. on the top or bottom of this product. This purely cosmetic and does not have any effect on quality, reliability or electrical specs. Specifications (characteristics) * Refer to application manual for details. Recommended Operating Conditions Current consumption characteristics Ta =-40 C to+85C Item Symbol Conditions Min. Typ. Max. Unit Item Symbol Conditions Min. Typ. Max. Unit Power voltage VDD - 1.6 3.0 5.5 V VDD Clock voltage VCLK - 1.6 3.0 5.5 V CE0, CE1=GND - 0.6 1.2 =5V Operating FOE=GND TOPR - -40 +25 +85 C IBK A temperature FOUT output OFF VDD - 0.4 0.8 ( Hi- z) =3V Frequency characteristics Current Consumption Item Symbol Conditions Rating Unit CE0, CE1=GND VDD - 8.0 20.0 FOE= VDD =5V Frequency Ta=+25C 6 f/f 10 B: 5 23 tolerance VDD=3.0V I32k A FOUT VDD 32.768kHz output ON Oscillation Ta=+25C - 5.0 12.0 tSTA 3 Max. s =3V CL= 30pF start-up time VDD=3.0V Please ask for tighter tolerance. (Equivalent to 1 minute of monthly deviation) 0.5 6.3Max.