CypressメーカーSTK17TA8の使用説明書/サービス説明書
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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.
デバイスCypress STK17TA8の購入後に（又は購入する前であっても）重要なポイントは、説明書をよく読むことです。その単純な理由はいくつかあります：
Cypress STK17TA8をまだ購入していないなら、この製品の基本情報を理解する良い機会です。まずは上にある説明書の最初のページをご覧ください。そこにはCypress STK17TA8の技術情報の概要が記載されているはずです。デバイスがあなたのニーズを満たすかどうかは、ここで確認しましょう。Cypress STK17TA8の取扱説明書の次のページをよく読むことにより、製品の全機能やその取り扱いに関する情報を知ることができます。Cypress STK17TA8で得られた情報は、きっとあなたの購入の決断を手助けしてくれることでしょう。
Cypress STK17TA8を既にお持ちだが、まだ読んでいない場合は、上記の理由によりそれを行うべきです。そうすることにより機能を適切に使用しているか、又はCypress STK17TA8の不適切な取り扱いによりその寿命を短くする危険を犯していないかどうかを知ることができます。
ですが、ユーザガイドが果たす重要な役割の一つは、Cypress STK17TA8に関する問題の解決を支援することです。そこにはほとんどの場合、トラブルシューティング、すなわちCypress STK17TA8デバイスで最もよく起こりうる故障・不良とそれらの対処法についてのアドバイスを見つけることができるはずです。たとえ問題を解決できなかった場合でも、説明書にはカスタマー・サービスセンター又は最寄りのサービスセンターへの問い合わせ先等、次の対処法についての指示があるはずです。
