Gebruiksaanwijzing /service van het product STK17TA8 van de fabrikant Cypress
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STK17T A8 128k X 8 AutoS tore™ nvSRAM with Real T ime Clock Cypress Semiconductor Corpora tion • 198 Champion Court • San Jose , CA 95134-1709 • 408-943-2600 Document #: 001-52039 Rev .
STK17T A8 Document #: 001-52039 Rev . ** Page 2 of 23 Pinout s Figure 1. Pin Diagram - 48-PIn SSOP V SS A 14 A 12 A 7 A 6 DQ 0 DQ 1 V CC DQ 2 A 3 A 2 A 1 V CAP A 13 A 8 A 9 A 11 A 10 DQ 7 DQ 6 V SS A .
STK17T A8 Document #: 001-52039 Rev . ** Page 3 of 23 Absolute Maximum Ratings V oltage on Input Rela tive to Gr ound ................ –0.1V to 4.1V V oltage on Input Rela tive to V SS .........–0.5V to (V CC + 0.5V) V oltage on DQ 0-7 or HSB ....
STK17T A8 Document #: 001-52039 Rev . ** Page 4 of 23 AC T est Conditions Input Pulse Levels ...... ............... .............. ........... ...... 0V to 3V Input Rise and Fall T imes ........... .............. .............. ..... < 5 ns Input and Output T iming Reference Levels .
STK17T A8 Document #: 001-52039 Rev . ** Page 5 of 23 RTC DC Characteristics Figure 4. RTC Recommended Component Configuration Symbol Parameter Commercial Industrial Unit s Notes Min Max Min Max I BAK RTC Backup Current — 300 — 350 nA From either V RTC ca p or V RTC b at V RTC ba t RTC Battery Pin V oltage 1.
STK17T A8 Document #: 001-52039 Rev . ** Page 6 of 23 SRAM READ Cycles #1 and #2 Figure 5. SR AM READ Cycle #1: Address Controlled [3, 4, 6] Figure 6. SRAM READ Cycle #2: E and G Controlled [3, 6] Notes 3. W must be high during SRAM READ cycles. 4. Device is continuously selected with E and G both low 5.
STK17T A8 Document #: 001-52039 Rev . ** Page 7 of 23 SRAM WRITE Cycles #1 and #2 Figure 7. SRAM WRITE Cycle #1: W Controlled [7, 8] Figure 8. SRAM WRITE Cycle #2: E Controlled [7, 8] Notes 7. If W is low when E goes low , the outputs remain in the high-impedance state.
STK17T A8 Document #: 001-52039 Rev . ** Page 8 of 23 AutoStore/Power Up Recall Figure 9. Au toStore /Power Up RECAL L Notes 9. t HRECALL starts from the time V CC rises abov e V SWITCH 10. If an SRAM WRITE has not tak en place since the last nonvolatile cycle, no STORE will take place 1 1.
STK17T A8 Document #: 001-52039 Rev . ** Page 9 of 23 Sof tware-Controlled ST ORE/RECALL Cycle In the following table, the soft war e controlled STORE and RECALL cycle para meters are listed. [12, 13] Figure 10. Software STORE / RECALL Cycle: E CONTROLLED [13] Figure 1 1.
STK17T A8 Document #: 001-52039 Rev . ** Page 10 of 23 Hardware ST ORE Cycle Figure 12. Hardware STORE Cycle Sof t Sequence Commands Figure 13. Sof t Sequence Commands NO.
STK17T A8 Document #: 001-52039 Rev . ** Page 1 1 of 23 MODE Selection E W G A 16 -A 0 Mode I/O Power Notes H X X X Not Selected Output High Z S tandby L H L X Read SRAM Output Data Active L L X X Wri.
STK17T A8 Document #: 001-52039 Rev . ** Page 12 of 23 nvSRAM Operation The STK17T A8 nvSRAM i s made up of tw o functional compo- nents paired in the same physical cell. These are the SRAM memory cell and a nonvolatile QuantumTrap cell. The SRAM memory cell operates like a standar d fast static RAM.
STK17T A8 Document #: 001-52039 Rev . ** Page 13 of 23 atile elements. Once a STORE cycl e is initiated, further memory inputs and outp ut s are disabled until the cycle is completed. T o initiate the Software STORE cycle, the following read sequence must be performed : 1.
STK17T A8 Document #: 001-52039 Rev . ** Page 14 of 23 Figure 15. Current versus Cycle Time RTC Operations Real T ime Clock The clock registers maintain time up to 9,999 years in one second increments.
STK17T A8 Document #: 001-52039 Rev . ** Page 15 of 23 Calibrati ng The Clock The RTC is driven by a quartz controlled oscillator with a nominal frequency of 32.768 KHz. Clock accuracy will depend on the quality of the crystal, specified (usually 35 ppm at 25 C).
STK17T A8 Document #: 001-52039 Rev . ** Page 16 of 23 Interrupt s The STK17T A8 has a Flags register , Interrupt Register , and interrupt logic that can interrupt a microcontroller o r generate a power-up master reset sig nal. There are three potenti al interrupt sources: the watchd og timer , the power monitor , and the clock alarm.
STK17T A8 Document #: 001-52039 Rev . ** Page 17 of 23 RTC Register * A binary value, not a BCD value. 0 - Not implemented, reserved for future use. Default Settings of nonvolatile Calibrat ion and In.
STK17T A8 Document #: 001-52039 Rev . ** Page 18 of 23 Register Map Det ail 0x1FFFF Real Time Clock – Y ea rs D7 D6 D5 D4 D3 D2 D1 D0 10s Y ears Y ears Contains the lower two BCD digits of the year . Lower nibb le contains the value for years; up per nibble contains the value for 10s of years.
STK17T A8 Document #: 001-52039 Rev . ** Page 19 of 23 0x1FFF7 Watchdo g Timer D7 D6 D5 D4 D3 D2 D1 D0 WDS WDW WDT WDS W atchdog S trobe. Setting this bit to 1 reloads and restarts the watchdog timer . The bit is cleared automatically once the watchdog timer is reset.
STK17T A8 Document #: 001-52039 Rev . ** Page 20 of 23 0x1FFF2 Alarm – Seconds D7 D6 D5 D4 D3 D2 D1 D0 M 10s Alarm Seconds Alarm Seconds Contains the alarm value for the seconds and the ma sk bit to select or desel ect the seconds’ value. M Match.
STK17T A8 Document #: 001-52039 Rev . ** Page 21 of 23 Ordering Information Ordering Codes Packing Option Blank=T ube TR=T ape and Reel T emperatu re Range Blank=Commercial (0 to +70 C) I= Industrial .
STK17T A8 Document #: 001-52039 Rev . ** Page 22 of 23 Package Diagrams Figure 17. 48-Pin SSOP (51-85061) 51-85061 *C [+] Feedback.
Document #: 001-52039 Rev . ** Revised Ma rch 02, 2009 Page 23 of 23 AutoS tore and Qu antumT rap are re gistered trademarks of C ypress Semiconducto r Corporation. All product s and compa ny names mentio ned in this document are the trad emarks of th eir respect ive holders.
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