57408-1B /D-2717

57408-1B /D-2717

：（同号）/，

大量现货，价格合理，当天打款，当天顺丰，即日到货。
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从发展趋势看来，智能水表的比例会越来越多。和传统机械表相比，智能水表可以节约很多人工，同时进步抄表的正确性，可以实现门路化收费，更有效的利用有限的水资源。

为了节约本钱，采用总线方式的智能水表较少，电源一般由水表自行提供，这就对水表的功耗提出了近乎苛刻的要求。按照国标规定，智能水表的静态电流应该小于30μA，实际中水表厂商都把该指标控制在10μA以内（使用干簧管传感器时），保证工作时间大于6年以上才算合格。

在水表电路的微控制器中，NEC电子公司的78K0/Lx3系列以其的功耗轻松满足水表客户的严格要求。并且内部集成有很多实用模块，比如RTC、LCD驱动、LVI检测及10位/16位AD转换器等，可以很方便地帮助客户快速构建高性价比的解决方案。57408-1B /D-2717

78K0/Lx3微控制器先容

NEC电子78K0/Lx3微控制器是高性能8位通用微控制器，采用NEC电子的78K0内核，有48Pin～80Pin的多种封装，内置4Com/8Com模式的LCD驱动，可以驱动的LCD段数高达288段。

Lx3微控制器内置高精度8MHz振荡电路，并且可以通过寄存器往控制内部振荡电路的快慢。对于不需要实时时钟的水表，可以节约本钱，加快软件开发进度。假如需要使用RTC，则需要外接32.768kHz的振荡器，可以轻松实现门路复费率水费。

通讯方面，Lx3内置有3路串行接口，并且内置有曼彻斯特编码器和远控接收器两个硬件模块，在远传及无线方面的多种选择让客户轻松应对瞬息万变的市场需求。

功耗方面，Lx3低于1μA的静态功耗可以有效延长电池使用寿命，而且有利于进步系统的稳定性和抗干扰性。1.8V～5.5V的工作电压可以zui大限度的使用电池能量。内置的16级LVI模块更是免往了客户的后顾之忧，随时监测电池电压，一旦发现电池电压下降过限，就立即通知用户并存储关键数据。

Lx3系列微控制器不但适用于丈量表计，同样也适合家用电器和数码设备。

NEC电子水表解决方案

NEC电子水表方案采用NEC电子的78K0/Lx3微控制器，可以在微控制器内置的Flash存储器上存储数据，节省EEPROM芯片用度。

功耗方面，通过各种节电措施，配合NEC电子低功耗的微控制器，在LCD常显的情况下，整机达到3.8μA的超低功耗。智能水表方案见图1。

● NEC电子水表方案的特点

NEC电子水表方案是卡表方案，支持多种读写卡，通过卡座使用IIC协议与微控制器通讯。

具有的基本功能如下。

(1)基本计量功能：每0.1立方米写进一次数据。

(2)LCD显示功能：显示错误信息、报警水量、剩余水量、透支水量等多项数据。

(3)购水治理功能：支持出厂预置、购水、停水、水量查询、抄表等功能。

(4)报警断水功能：当剩余水量达到报警水量时，阀门会自动封闭，提示用户购水。假如剩余水量为0，阀门封闭，但是重新插卡后，可以在预置透支水量范围内继续用水。假如用户透支的水量达到预置透支水量，则封闭阀门断水。

● NEC电子水表的特殊功能

数据存储功能：本方案的数据存储有两种方式，一种是使用EEPROM来存储数据，另外一种是在NEC电子的Flash存储器上可以实现EEPROM模拟功能，在NEC电子的微控制器内置的Flash存储器中存储数据，达到和EEPROM同样的存储效果。通过NEC电子提供的库文件能够方便实现Flash存储器的EEPROM模拟功能。

节电功能：将EEPROM和卡座的供电电源封闭，使其处于睡眠状态。NEC电子78K0/Lx3的LCD内部分压电阻阻值为60K左右，为了进一步降低功耗，我们采用330K的外部分压电阻。通过这些办法，该水表方案在待机模式下，整机功耗保持在1.8μA。

攻击防止功能：能够判定是否被攻击，假如处于受攻击状态则封闭阀门。软件上有很多处理，可以有效防止对微控制器的干扰。

透支水费计量：假如由于外部攻击或机械故障等原因阀门无法正常封闭，在用水时仍然计量透支水费。

自动除垢功能：每月自动开关阀门两次，以防止*不使用的电机故障。

电池能力监测：使用内部的LVI模块监测电池电压，电压不足时及时报警，并封闭阀门，LCD上提示更换电池。

软件结构

本系统软件由主程序和中断处理程序组成。主程序主要完成系统初始化的功能，然后定时查询各标志位，假如各标志位都为0，进进STOP待机模式。中断处理程序包括LVI低电压检测中断、水量脉冲丈量中断、卡检测中断，以及磁攻击处理程序、LCD和看门狗处理程序。主程序流程见图2。

Digital Controller Transceiver 5010503F-P3 (M5904)

Networth 8/16 Bit Combo UTP Ethernet Card 79804376 Rev C (PCB 1012-1)

In 8/16 ISA Lan Adapter Coax (309962-001)

In EtherExpress 16TP ISA LAN Adapter PCLA8120 (304937-008)

Hoffman Enclosure with emecanique alarm light and Sonalert tone alarm

IBM 8525 Audio Speech Card 8-Bit ISA - Vintage (33F4461)

Kouwell 8-Bit Edge Floppy Drive Controller Card (KF-503C)

Nor M7310 Norstar ephone (NT8B20AF-03)

IBM IBM 9404 V.35 CABLE Assembly (72X5641)

Tescor Technology Orange Strobe Light - Pole Mounted (80-130 VAC)

Matrox Millennium II For Mac PCI Video Card (MGA-MIL/MAC8N)

Huntington Labs Vacuum Conflat Flange (O.D. 2.75", I.D. 1.5")

Cisco Systems Interface Card 56/64K DSU/CSU 74-0573-05 (WIC 1DSU)

HP 1080MB 3.5" IDE Hard Drive - Quantum 1080AT (D2919-63001)

Woo Young TGS-6004 Back Plane Bus Board 8 ISA Slots AT (PBC22-98DA-2.5?4DS)

Varian / Ultek Vacuum flange (CF 2.75" O.D x 1.5" I.D)

Supra Express 336K External Modem (33.6)

Trident ISA EGA/VGA Video Card HNG8916CX248LC2 (000-88916CE2)

Trident VGA Card (7343 Rev C1HK)

Digicom ISA Modem Blaster Card (DI5656/5600)

Packard Bell / SRS Technology Internal Modem ISA Sound Card (FCC ID 138-M834)

Medion PC-Combo Modem/TV-Tuner (CTX908)

AMF 24 V Relay w/ Connection Bracket 844509 (KAP 11 DG)

Basler Electric Power Supply 24Vac 10VA (A1009-001)

Valcor Solenoid Valve (51C56T34-3)

Spectra Physics Scale Display for POS System 4683 4-Pin Amp (960RD)

HP Control Panel for Laserjet 4000 Series Printer (RG5-3715)

Artisoft COAX 16 Bit ISA Network Card 10676 (PCB, 2000/C)

Solarmax 300W ATX Power Supply (KC-300)

The Eppley Laboratory, Inc. Students Cell (EPLAB)

IBM IBM 4683-P21 POS Cable 12.5 Foot 16-Pin Amp (93F0534)

IBM 8-BIT ISA Baseline Network Card (2X)RJ-11 PS/2 853 (72X8017)

Hamilton New 50 uL Fixed Volume Pipette -Sandstone SoftGrip (1708-09)

IBM 8 Bit ISA Token Ring Cards long board (67X0849)

Acculogic VLB VESA Local Bus16 Bit ISA IDE, 2 SERIAL PORTS 130-00419-00

IBM 1.44 MB 3.5" Blue Button Floppy Drive - MF355C-599MQ1 (1619618)

Microsoft InPort 8-bit BUS Mouse Card (900-255-018 Rev G)

Panasonic Phone (VB-44223-B)

Cosmodyne Gage, Pressure, Dial Indicating (3200532-1)

Artisoft 16 Bit ISA Ethernet Adapter (10282)

IBM 16 Bit ISA Ethernet Combo LAN Adapter KC331600 (48G7170)

Vertex 32 Bit Vega 15 Pin Card 04021870 (DB-VCLL5424FV1?0)

Cirrus Logic Vesa Local Bus GUI Card 15 Pin (PTI-5426VL)

Trident 7343 Rev C1HK 32 Bit 15 Pin VGA Card (7343 Rev C1HK)

Cirrus Logic VLB Video Card 1MB Upgradable To 2MB (CL-GD5426-80QC?-B)

National Computer Hard Drive Controller 16 Bit ISA (NDC5425 02)

Compaq 400778-002 8MB AGP Video Card (402125-001)

Smart Modular Technologies PCI Combo Sound Card & Modem 5184-9924 (90079)

StarTech 2-Port 16950 Serial PCI Card (PCI2S950)

Computer Power Systems DPM Bd (102216)

Cirrus Logic VLB Video Card MVGA-AVGA4VL (L-GD5428-80QC-?A)

Quad VLB VGA Video Card 0714014-01 (VGA-805-V)

DTK PC/AT Compatible Mono W/G&Printer V6 (Add-on Card for PC/XT)

Generic SCSI Memory Board 240-8076-1/B (85-3680-01)

IBM Etherjet ISA Combo Ethernet Adapter RJ-45/AUI/COAX (13H9263)

In 16 Bit Lan Adapter, PRO/10 TP/BNC/AUI ISA (352121-001)

Wang Processor Card (9792-0)

In 80486 overdrive 50 MHz (SZ902)

In 486 SX Processor KU80486SX-33Mhz (SX673)

AST Laser Printer Controller (202097-002)

Fisher Precleaned Microscope Slides - Lot of 3 Boxes (12-550-43 YELLOW)

AST Memory Board (202196-301 B)

MICRONICS 256KX4/1MX1 Memory Board (09-00016)

Lucent Technologies / Avaya DID Trunk (TN753 V21)

Zebra Module (403520-091P)

Zebra Module (402420-001)

Papst Dual Fan Assembly (3")

Corning Costar Stripette 2mL IN 1/100mL 50-pack (4486)

Wilkerson Regulator (R16-02-000A G94)

Bell & Howell Lens (2" / F/1.2)

Zenith CPU/Memory Board ISA Long Card (85-3222-01)

Dell 1.6GB IDE 3.5" Hard Drive - Maxtor 81620D2 (088867)

Dell 8x DVD-ROM/DISK DRIVE MODULE (2U805)

Sun 18.0GB Fujitsu MAA3182SC 7200RPM SCSI 80PIN HDD (3703414-05)

Cardex PCI Video Card S3 Trio64 (9407-00)

Oak Technology Video Card (1542600020)

Diamond Video Card (Speeedstar Pro)

WDC ISA Video Card (59-XP6676P-000?0)

Cirrus Logic GD5426 VLB Video Card (9208-31)

ATI VGA Video Card (1090010401)

Trident JAX VGA Card (VL46F-R4)

Belkin 4-port cable/dsl gateway router (F5D5231)

Data Technology Disk Controller Card (10-00283)

Anzac Power Divider (DCH-6560-X)

Nelson Thermal Switch (TA119-012 GZ)

Q.V.S. Inc Multi-meter movement - 4.5" Diameter (MOD-450R)

Microlab Directional Coupler -10 dB (CB-E71)

Anzac Power splitter (C254124)

ATI Radeon Video Card (RV250XT-B3)

FSI Cable - FSI Polaris (905143-025)

Diamond PCI Video Card v. 1.14 (Stealth 64 DRAM)

Hayes Accura 56K Ext Modem (5669US)

In Modem Sound ISA Card (202275-351)

Aztech 4x2 33K ISA Sound/Modem Card (AT6800W)

Diamond PCI Video Card 23030057-224 (ST64VDVRM PCI E3 220 2&)

Number Nine PCI Video Card S3 Vision968 IABC3 (PC00BPZ0-2)

ADC ephone Modem AC 120V 60 HZ 9 W (MD 1202)

Asante Print Modem (94405A5B)

In 486/50Mhz Processor A80486DX2-50 (SX749)

Lexmark Optra Print Server Card (43H2439)

Dynova T-Zone Parallel Adapter Card (RT900400603)

B&B Electronics ISA Serial Card (1680 Rev 5)

DTK RS-232 Serial Card - 8-Bit ISA (PII-108)

Multitech 8 Bit ISA Controller Card (PB85020-2H)

Star Tech I/O BOARD (D10-500)

Toshiba 1.2 MB 5.25" Internal Floppy Drive Vintage FDD6882U2P (ND-08DE)

Mica Mica Interface Card (15437A)

Western Digital WD1003V-MM1 F000 X4 (61-600188-00)

Western Digital Card WD1003V-MM2 F000 X4 (61-600173-00)

Potter & Brumfield Time Delay Operate Adjustable 0.1 to 10Sec (CB-1003B-70)

Action Instruments Dual (Hi/Lo Trip, Non-Latching (SPDT, 5A) (AP1420 / MO2OA)

IBM 12.5' Register Cable (39F6311)

IBM 12.5' Register Cable (6316839)

IBM 12.5' Register Cable (73G8856)

Symbol LS4005I-I117 Barcode Scanner (LS 4000i)

HEINEMANN C.BRACKET 20 A 250 V (AM3-A3-A)

In 486/50Mhz Processor A80486DX2-50 (SX626)

In 486/50Mhz Processor A80486DX2-50 (SX808)

Tandy ISA Serial/Parallel Controller Card (870-9643)

Cirrus Logic PCI Video Card Turbo-C (CL-GD5430-QC-C?)

Eastman Kodak Lot of 4 Portrait Film Developing Hangers 3 1/4" x (NO.4)

In 486/50Mhz Processor A80486DX2-50 (SX954)

Everex Systems I/O BOARD (EV231C)

HP PCI Net Card (5182-5446)

NeoTecH Single Bidirectional Parallel Adapter (PM101)

Kouwell 8-Bit ISA Card (KW-524K)

SIIG Parallet Port IEEE ISA Card (JJ-A01E12)

Acer 8230MGC2 8 Bit Video Controller (910)

Wyse DUAL SERIAL/PARALLEL I/O (990205-01)

Artisoft Lantastic 2.0 Mb Adapter 16bit (E2M159235)

IBM Controller Card (59X1012)

Quantra Controller Card (WJ3203T)

DTK Multi I/O card Multi I/O card (PTI-209)

Kouwell 16 Bit ISA Serial Parallel Controller Card (KW-556F/H)

Millipore KF Pipe Fitting inlet w/ tube fitting (CES4209)

Adeptec SCSI Controller Card (AHA-2840VL/284?2VL)

Generic Gas Burner (Burner)

Generic LCD Projection Lens - 4 (7 x 5 x 4)

Generic LCD Projection Lens - 2 (9 x 5 x 4)

Extender Board Logic PCB Module Extender (Assy. 102971-001 rev A)

IBM Cable Asm, 4 m, Store Controller (Cable 1) (6316840)

ATI PCI MACH64 109-25500-40 Video Card (1022555340)

Potter & Brumfield Circuit Breaker Switch 10A (W92-X112-10)

Miteq OSCILLATOR (XTC-01-114.680?566-28P)

IXMicro PCI Video Card Mac Twin Turbo 128 3D 16 MB MAC (Twin Turbo 128M8)

CTI Cryogenics Compressor He Supply Line (8143122 G001)

CTI Cryogenics Compressor He Supply Line (8143143 G001)

CTI Cryogenics Compressor He Return Line (8143143 G002)

Bay Networks Centillion 5000 Supervisory Module (5110)

Delta Electronics 352 Watt Power Supply NCR 3412 Server (DPS-350EB)

HP CD-RW External 2x2x6 Plus 7200 (C4381A)

Cisco 48 Port 10-base-T Ethernet Switching Module (WS-X5012A)

Compaq Proliant DL380 G2 DC Converter (207066-001)

HP 300W ATX Power Supply- 24 Pin - Liteon PS-5301 (5188-2625)

ABB 690V 100kA 400V Manual Motor Protector (MS325 1.6-2.5 Amp)

Zenith 181-7726-10 Memory Board (Z-415-B)

Keyence Fiber Optic Sensor / Amplifier Digital Calibration (FS-V1)

American Optical Scientific Instruments Lamp Light Source Bulb Housing (655)

3M Wrist Strap Tester - No Wrist Band (716)

Weidmuller Breakout Module (170125)

DTK 16 Bit ISA Multi I/O card Vintage 1986 (PTI-203)

Quadram 8 Bit ISA Video/Sound Card Vintage 1985 (435-0002)

PC Parts Inc 8 Bit ISA Multi-Video Board (212-00040)

Rhetorex 4000 4 port rev B1A ISA Base Board (RDSP 24000)

Bestec 250W ATX12V Power Supply EMACHINE (ATX-250-12E)

Agilent 8711/12/13/14C RF Network Analyzers/8730A Tuner An (08712-90045)

Xerox Auxiliary Paper Tray (7041/7042)

Gateway Port Replicator (8001629)

Andrew TRR 8218L-DC MAU (301-0156-03)

Altos Keyboard (540-17700-001)

IBM IBM 8550 Power Supply - Proprietary (6278214)

IBM IBM MFM Hard Drive Controller Card (6480111)

Vacuum Bellows Connect .6875" small opening .75" big opening 3" tall (Pump)

SMC 2 Color High Precision Digital Pressure Display / Switch (ZSE30-01-25)

SMC SMC AR30-NO3-Z Modulator Regulator w/valve

Dwyer 15 PSIG Magnehelic Pressure Gauge 0-.50" Water on metal Bracket (2000-0 C)

IBM 8-Bit ISA Floppy Controller and External Floppy Port 72X6757 (90X8827)

Astec Power Supply 110-240V in to 15V 3A Out (15D3.0)

Allen-Bradley 10 - 16VDC Output Module (1771-0BD)

IBM 330W Power Supply (01K9858)

Nikon Transformer (XN)

Dixon 1/4 MINI REGULATOR w/Gauge (R00-02R)

Picture IR Keypad for Picture Video Conferencing Camera (540-0060-01)

Millipore Filter Housing Inlet 1" I.D. , 1"x 2.5" body I.D (MH)

Netier Technologies Keyboard (ACK-295)

IBM 3192F Logic Base for Terminal (81X5949)

IBM 3192 Terminal Logic Base (6457-001)

NEC PS-2 Keyboard (RT6656TW)

Dell Keyboard (3515274-01)

Gateway PS/2 2000 Keyboard (2196001-00-102?)

Microsoft Soft Key Keyboard (F-21K)

V-Infinity Single Output Encapsulated DC-DC (PTK15-Q48-S5)