描述

RM7800L1087

?在嵌入式微控制器應(yīng)用中，通常都要用到非易失性存儲器。無論是掉電時維持需要保存的設(shè)置，還是存儲公司的重要記錄，可靠的非易失性存儲器都是現(xiàn)代微控制器領(lǐng)域的一個基本單元。

? ? 非易失性存儲常常采用外部串行存儲器實現(xiàn)。多年以來，該領(lǐng)域用到了數(shù)十億顆類似存儲器件，它們的可靠性得到了的廣泛認(rèn)可。目前，存儲器可以做到幾百字節(jié)到1兆字節(jié)甚至更大的容量，在每一個需要保持設(shè)置的設(shè)備中，都能找到這樣一個緊湊、廉價的器件。

? ? 包括EEPROM、閃存和旋轉(zhuǎn)式存儲器在內(nèi)，所有類型的非易失性存儲器都面臨一個共同的問題：寫周期被中斷時，數(shù)據(jù)會丟失。一旦在寫周期執(zhí)行過程中掉電，那么即使再恢復(fù)電源，也很難修復(fù)損壞的數(shù)據(jù)。本文提出了一種基于事務(wù)的提交-回退機制，用于保護(hù)一個外部串行EEPROM存儲器件的內(nèi)容。這些措施同樣適用于大多數(shù)M

? ? AXQ微控制器的內(nèi)置EEPROM。

? ? I2CEEPROM的特點

? ? 串行存儲器件有多種接口，但最常用的接口是I2C接口。這種總線接口有很多優(yōu)點：高度標(biāo)準(zhǔn)化的接口；控制器和存儲器之間只需兩條線；而且具有靈活的時序要求，可以由軟件驅(qū)動。一個I2C主機可以驅(qū)動很多I2C從機，從而最大程度減少了主機的引腳數(shù)。

? ? 在所有EEPROM器件中，寫周期都要比讀周期長的多。因為在寫周期過程中，電荷需要借助隧道效應(yīng)并通過絕緣層進(jìn)行轉(zhuǎn)移，而這個過程很費時間。雖然增加電壓可以加快這個過程，但是過高的電壓會導(dǎo)致絕緣層的介質(zhì)擊穿，從而損壞器件。典型的EEPROM器件寫周期持續(xù)10毫秒左右；而讀周期通常需要幾百個納秒。

? ? 為了顯著縮短寫周期的時間，許多I2CEEPROM器件采用頁面模式。該模式允許將多個字節(jié)傳送到緩存中，然后將數(shù)據(jù)一次性寫入存儲區(qū)。I2C存儲器件的典型頁面尺寸為32字節(jié)。因此，可以在一個寫周期內(nèi)向EEPROM填入32個字節(jié)。

? ? 這一點非常重要，因為串行EEPROM器件都具有特定的耐久度：即每個頁面所能承受的寫周期次數(shù)上限。典型的寫周期次數(shù)從10,000到1,000,000次。然而，即使存儲器件能夠承受1百萬次寫周期，軟件也會很快將其損耗殆盡。軟件每秒僅執(zhí)行100次寫周期，那么不到3個小時就會耗盡器件的寫周期次數(shù)。

產(chǎn)品承諾：
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Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA ? 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊 15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家

STEC MFC SEC-4400M NH3, 1 SLM, With CALABRATION SHEET

MKS BARATRON 628B13TBE1B, 1000 TORR, CALABRATION SHEET.

MILLIPORE intelliFlow DEVICE NET, N2, 50 ,400, 200 SCCM

Motion Engineering SA-NOV controller lot’s of 2 used

STEC LF-310A, TEPO,0.25 g/min, liquid flow controller

AMAT 0010-0 09416 Etch Chamber RF Match, Untested used

Sieger Gas detection DIGI-CAT and DIGI-CHEM with sensor

Comdel, CPS-500AS RF Power source, AMAT 0190-13320

ENI VL-400 Phase shift controller

AMAT 0010-0 09416 Etch Chamber RF Match, Untested used

Lam 230-140148-308 ESC, 8 inch, look new in Box

SHB INSTRUMENTS MODLE 109 SCOPE

ASYST TECHNOLOGY P/N 01270-001, Cassette loader,

CTI ON-BOARD NETWORK TERMINAL CONNECTOR

Bentek DC PC BOARD, reliance, 03-188758-00, Novellus

UNIT UFC-8160, NF3, SiH4, PH3, lots of 3, used

PB02807 BM18164 DAN 9710094

BM26015/L AB26015/N ASSY, H-STN XORB-100

BM302960000 /D 9923DAN

502622 BM303030200

AMETEK 80440K 94V-0, REV B

19801004800874 JZ29A-01 MEIDEN, MU24A30756

FABR 016763 REV A

DSC-002 99A5 PCB BOARD

PTI4 4896

PROM DISK 66700301

TYLAN 2979M Mass Flow Controller FC-2979MEP5-WM, Gas O2

Phasetronics P1229 Driver, AMAT 0190-05682, 2 unit

Terranova 934 wide range vacuum gauge controller used

LAM 685-094680-001 LIGHT PEN 0080025890 interface PCB

MYKROLIS intelli flow 3XP, N2 1000SCCM lots of 2 used

NOVELLUS ISIOC HI-LO Transfer 02-150755-00 REV.A

ISIOC Power supply, 02-125105-00, 27-053659-00 used

NOVELLUS Controller I/O DUALCAP 27-156710-00, REV.C

MKS BARATRON 624A21TBC, 20 TORR, CALIBRATION SHEET.

MKS BARATRON 627A12TBC, 100 TORR, CALIBRATION SHEET.

MKS BARATRON 122B-11993, 100 TORR, CALIBRATION SHEET.

MFC Mykrolis FC-2902MEP5-T, 5 SLPM, Gas N2 NEW

TYLAN 2900M series MFC lots of 3, and TN2900 MFC, USED

SensArray TC Thermal, Model 482-05-0002

SensArray TC Thermal, Model 482-XX-0002

3 Unit MFC UFC-1100A, N2 1SLM, 300 SCCM, 50 SCCM NEW

DeviceNet Unit MFC UFC-8565, H2 2L, SIH4 30CC lots of 2

Unit MFC UFC-8561C, H2 100CC lots of 2 used

6 NEW AMAT4020-01416 filtr AIR/WTR 1000 PSIG vacuseal

IN USA NDIR OPTI-sense 5000 lots of 2, used,

11 MKS BARATRON 852B61PCJ2GC, 60 PSIA

HP 3335A SYNTHIESIZER / LEVEL GENERATOR

SVG90 Electronic Cabinet spare parts

MILLIPORE IntelliFlow, N2 and SIH4 Used lots of 2

EDWARDS ACTIVE GAUGE CONTROLLER D38650000

MKS i-BARATARON DIGITAL MANOMETER DMA12TCECJNN633

Granville-Phill?ips 275 MINI-convectron lots of 3 used

MKS BARATRON 628B13TBE1B, 1000 TORR, very clean.

MKS BARATRON 629B13TBCJ1B, 1000 TORR, very clean

BELLOWS CYLINDER 80*60STMV lot’s of 2

Perkin Elmer PVD 4400 Sputter Chamber Liner, very clean

STEC MFC SEC-4550, O2, 50 SLM, looks clean

STEC MFC SEF-8460SL, N2, 50 SLM, looks clean

7 Sanyo Denki PM0PA1C3P20 PM DRIVER TYPE C

MKS baratron 127AAX-000100T, 10 TORR lots of 2

MKS baratron 124AA-00010BB, 10 TORR, lots of 2

STEC 4.0g/min TEOS LFC LF-410A-EVD

EFD 1500XL LIQUID DISPENSER and Foot Paddle controller

Sorensen power supply, DCS80-13E, 0-80 V, 0-13 A, used

AMAT 0226-09937 and AMAT 0226-09677 Pump Dist PCB

PureDigital Mass Flow Controller 6256, WF6, lots of 2

UltraGlo vacuum general UV2-11 & UC2-31S01, N2

Aera MFC TC FC-980C, SiH4 1 SLM with Calabration SHEET

INFICON AG, LI-9496 Balzers, CDG100A, 100 TORR

MYKROLIS intelli flow 3XP, N2, 5000 SCCM lots of 3 used

COMDEL LFMN 8/5, novellus P/N 27-296658-00

MKS BARATRON 627B152TBC1B, 500 TORR, looks very clean

828-36-003 Lot of 2 Pole PC, Outer, Short

PHD, 4475-19 ParentD30, 0180502-3-01 Actuator, Mini Rot

899-02-054 Non-Cooled D.S.S. Plate Inset

828-36-002 Pole Pc Outer Long, 828-36-017, 828-20-005

MKS Spectra HPQ2, Microvion plus, Resist torr, lot’s 3

Advanced Energy AE 3155039-000A TCM

SYSMELEC HANDHELD ROBOT & AUTOMATION CONTROLLER NO 181

TYLAN GENERAL, ADAPTORR MODEL AC-4, Millipore AC-4S02

TYLAN GENERAL, ADAPTORR MODEL AC-4, Millipore AC-4

MILLIPORE, ADAPTORR MODEL AC-2, Millipore AC213C REV C

Unit MFC 8565C, N2 750 SCCM NEW with calibration form

UNIT UFC-1660 N2, 50 SCCM, lots of 2, used, as is

STEC 0.2g/min TEPO LFC LF-310A-EVD

Vat Gate Valve, heater, 64248-XE52-1108?, Looks clean

Leybold Turbotronik controller NT 340 M Turbo Pump

CTI CRYOGENICS KEYPAD, FOR ON-BOARD SYSTEM

CTI CRYOGENICS KEYPAD CONTROLLER, FOR ON-BOARD SYSTEM

MKS CDN391R AS01391-21-1 PCB

MKS CDN396R AS01396-6-5 PCB

Asyst SB-731 Robot Pendant Controller, Looks New

Asyst SB-731 Robot Pendant Controller, Looks New

VARIAN WAVEFORM GEN III ASSY 01907110 BOARD

ILLIMINA ASSY 250878 CCA, COMM, ACHIMEDES, 250659 REV A

EMC-1 94V0, BM23475L11R REV B

PRI EMC-1 94V0, BM23475L11R, PC23475 REV B COMP SIDE

Aera Mass Flow Controller FC-PA780c, C4F8 and H2/N2

AMAT ANALOG I/O BOARD 0100-20100 APPLIED MATERIALS

AMAT ANALOG I/O BOARD 0100-20003 APPLIED MATERIALS

AMAT 0190-76005 Board OREGAN MICRO SYSTEMS, REV B

AMAT 0100-20003 AI/O ANALOG I/O BOARD, REV G

AMAT 0100-20100 AI/O ANALOG I/O ASSY BOARD, REV P4

AMAT 0100-20100 AI/O ANALOG I/O ASSY BOARD, REV A

MKS CONTROL VALVE TYPE 153D-4-100-2, THROTTLE VALVE

MKS BARATRON 627B12TEC1B, 100 TORR, looks clean

STEC SEC-4550 MFC, N2, 30 SLM, used

STEC SEC-4550 MFC, N2, 30 SLM, used

STEC SEC-4550 MFC, N2, 40 SLM, used

STEC SEC-7355 MFC, Ar, 50 SLM, used

STEC SEC-4550 MFC, O2, 50 SLM, used

AMAT 0010-76968 OTF centerfinder emitter and 0100-76055

Motorola MVME 340B 01-W3787B01B PCB, 84-W8787B01C

STEC MFC PV-1000, Piezo valve PV-1501MC NEW

STEC MFC SEC-4600MO, N2, 100 SLM Used

BM06240 R/J, COMP SIDE REV F PB02807 PRI BOARD

18800045 SRV/S06D06 SCHALTER MICRO- mit ROLLE

BM19261L01/C

SHB INSTRUMENTS MODLE 109 SCOPE

Astec Power supply MP1-3Y-2Q-4NN-0?0, Part # 73-690-0267

PORTER Liquid flow controller P2000-C010, 10.0 ML/MIN

MASS FLOW CONTROLLER MC-2100 NEW

MASS FLOW CONTROLLER MC-4400 NEW

MASS FLOW CONTROLLER MC-2200 NEW

Mass Flow Meter 1258B, Argon, lots of 2 used

SMC NP420-DN1 VV5Q11-ULB98018?1

TYLAN GENERAL CDL-21S06-EMC 0-100 T0RR RANGE, lots of 3

UNIT 1660 UFC-1660 He 10 SLPM with calabration sheet

Novellus Controller I/ 0 Daulcap Firmware Version 4.8

SMC NP420-DN1 VV5Q11-ULB00004?7

SMC NP420-DN1 VV5Q11-ULB98018?0

MASS FLOW CONTROLLER 5877, He, 10 SCCM lots of 2 USED

UNIT MFC UFC-8165, 10L, Gas N2, NEW in box

UNIT UFC – 7000 industrial MFC, H2, 1.00 SLM, NEW

BOC EDWARDS interface module, U20000521 used

UNIT UFC-1660 CL2 200 SCCM and O2 50 SCCM, lots of 2

UNIT UFC-1660 CL2 200 SCCM and O2 1 SLPM, lots of 2

MKS Baratron 627A01TBC, 1 TORR with connection valves

Granville Phillips 370149 Vacuum Gauge controller, used

USED Kollmorgen Magnet Driver AMAT 0190-70060

MKS MFC DPCA12T51CB00, AMAT 3030-10854, 50 sccm He

EDWARDS Active gauge D14549000

Tylan 2950 MFC FC-2952M 4V metal, Co, CHF4, lot’s of 2

SEMI GAS SYSTEM AUTOMATIC SWITCHOVER AND CYLINDER SCALE

2 STEC MFC SEC-4400MC N2, WF6, used

AMAT 0020-25836 PVD Clamp Ring 8 inch, very clean

Smart Cap Key – JSR – 1860 – 35, 4A-9-8, Lot of 15

BODINE ELECTRIC 42A3FEPM-E4 GEARMOTOR, 130 VOLTS, CLEAN

MILLIPORE FC-2902MEP-T, SIH4, 1.5 SLMP NEW

3 Mass Flow Meter Tylan FM-360, Argon and Air, untested

STEC PV-2000 MFC Piezo valve PV-2103MC NEW in box

STEC MFC SEC-4550M, N2, 40 SLM used

IRVINE OPTICAL CORPORATION 136PC1562

CT AURAVISION 94V-0 E92481

Tylan General CMLA-21 100 TORR CAPACITANCE GAUGE

LINTEC Liquid flow controller, TEOS, 0.1g/min used

Horiba Stec LF-310A-EVD TEPO 0.1g/min Liquid mass meter

Tylan 2900 MFC FC-2900M-EP, N2, 20 SLPM, lot’s of 2

Tylan 2900 MFC FC-2900M-EP, O2, 20 SLPM, lot’s of 2

RF MATCHING UNIT VSP-0971

Aera MFC FC-7800CD, SiH4 200 SCCM looks very clean

CTI-Cryogenics On Board P300 Module 8113160G001, 2 unit

TEMP CONTROLLER INR-244-402 WITH Omron BU SO4X

AMAT 0010-04926 HV Module CESC, untested

Jennings UCS-200-15S and CVCJ-1000-3S, looks very clean

Tylan General CMS-11S02, 0-10 TORR, lots of 2

ZYMARK MODULE EIA 112200

SEMITOOL 2601800 , 16750-505-0016

AMAT AFC 550, H2, 30 SLPM used

VERIFLO CORP GAS VALVE 45200254

APPLIED MATERIALS VALVE AIR ACTUATEO DIAPH

THERMOCOUPLE TYPE K 39 INCH VAC /39 INCH AIR KF40

PARKER VERIFLOW VALVE, 9444A0PLPN0SFSF?F, 48200029

專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊

PLC模塊，可編程控制器，CPU模塊，IO模塊，AI模塊，通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅

15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家