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i2c

i2c總線是由Philips公司開發的一種簡單、雙向二線制同步串行總線。它只需要兩根線即可在連接于總線上的器件之間傳送信息。
  • PCA9698 i2c擴展芯片

    PCA9698 是一款40 位i2c 輸入/輸出擴展器,能夠實現i2c/SMBus 應用中40 位GPIO 的擴展

    標簽: 9698 PCA i2c 擴展芯片

    上傳時間: 2013-11-21

    上傳用戶:文993

  • Using the P82B715 i2c extender

    The P82B715 i2c Buffer was designed toextend the range of the local i2c bus out to50 Meters. This application note describesthe results of testing the buffer on severaldifferent types of cables to determine themaximum operating distances possible. Theresults are summarized in a table for easyreference.

    標簽: extender P82B715 Using i2c

    上傳時間: 2014-12-28

    上傳用戶:lou45566

  • i2c總線

    i2c BUS(Inter IC BUS)是NXP 推出的芯片間串行傳輸總線,它以2 根連線實現了完善的雙向同步數據傳送,可以極方便地構成多機系統和外圍器件擴展系統。i2c 總線采用了器件地址的硬件設置方法,通過軟件尋址完全避免了器件的片選線尋址方法,從而使硬件系統具有最簡單而靈活的擴展方法。i2c 總線的2 根線(串行數據——SDA,串行時鐘——SCL)連接到總線上的任何一個器件,每個器件都應有一個唯一的地址,而且都可以作為一個發送器或接收器。此外,器件在執行數據傳輸時也可以被看作是主機或從機。

    標簽: i2c 總線

    上傳時間: 2013-11-05

    上傳用戶:qb1993225

  • i2c總線接口模塊設計

    本實驗是基于EasyFPGA030的i2c總線接口模塊設計,用EasyFPGA030開發套件通過i2c協議實現對二線制i2c串行EEPROM的讀寫操作,先把數據寫入EEPROM,然后再讀取出來顯示在數碼管上

    標簽: i2c 總線接口 模塊設計

    上傳時間: 2013-10-21

    上傳用戶:edisonfather

  • CAT9534 i2c IO 擴展芯片

    關鍵詞 CAT9534、i2c 總線、SMBus、I/O 擴展器摘 要CAT9534 是一款帶中斷的8 位并行i2c/SMBus 輸入/輸出端口擴展器件

    標簽: 9534 CAT i2c IO

    上傳時間: 2013-10-21

    上傳用戶:rocwangdp

  • i2c總線擴展器

    關鍵詞 i2c/SMBus、I/O 口擴展摘 要CAT9554 是是一款基于i2c 和SMBus 接口的8 位通用型輸入輸出(GPIO)擴展器件

    標簽: i2c 總線 擴展器

    上傳時間: 2013-12-31

    上傳用戶:woshinimiaoye

  • XA-S3 i2c driver software

    This application note demonstrates how to write an Inter Integrated Circuit bus driver (i2c) for the XA-S3 16-bitMicrocontroller from Philips Semiconductors.Not only the driver software is given. This note also contains a set of (example) interface routines and a smalldemo application program. All together it offers the user a quick start in writing a complete i2c system applicationwith the PXAS3x.The driver routines support interrupt driven single master transfers. Furthermore, the routines are suitable foruse in conjunction with real time operating systems.

    標簽: software driver XA-S i2c

    上傳時間: 2013-11-02

    上傳用戶:zw380105939

  • i2c slave routines for the 87L

    The 87LPC76X Microcontroller combines in a small package thebenefits of a high-performance microcontroller with on-boardhardware supporting the Inter-Integrated Circuit (i2c) bus interface.The 87LPC76X can be programmed both as an i2c bus master, aslave, or both. An overview of the i2c bus and description of the bussupport hardware in the 87LPC76X microcontrollers appears inapplication note AN464, Using the 87LPC76X Microcontroller as ani2c Bus Master. That application note includes a programmingexample, demonstrating a bus-master code. Here we show anexample of programming the microcontroller as an i2c slave.The code listing demonstrates communications routines for the87LPC76X as a slave on the i2c bus. It compliments the program inAN464 which demonstrates the 87LPC76X as an i2c bus master.One may demonstrate two 87LPC76X devices communicating witheach other on the i2c bus, using the AN464 code in one, and theprogram presented here in the other. The examples presented hereand in AN464 allow the 87LPC76X to be either a master or a slave,but not both. Switching between master and slave roles in amultimaster environment is described in application note AN435.The software for a slave on the bus is relatively simple, as theprocessor plays a relatively passive role. It does not initiate bustransfers on its own, but responds to a master initiating thecommunications. This is true whether the slave receives or transmitsdata—transmission takes place only as a response to a busmaster’s request. The slave does not have to worry about arbitrationor about devices which do not acknowledge their address. As theslave is not supposed to take control of the bus, we do not demandit to resolve bus exceptions or “hangups”. If the bus becomesinactive the processor simply withdraws, not interfering with themaster (or masters) on the bus which should (hopefully) try toresolve the situation.

    標簽: routines slave i2c 87L

    上傳時間: 2013-11-19

    上傳用戶:shirleyYim

  • i2c串行CMOS EEPROM、精密復位控制器和看門狗定

    i2c串行CMOS EEPROM、精密復位控制器和看門狗定時器的監控電路 特性􀂄 看門狗監控SDA信號 (CAT1161)􀂄 兼容400KHz 的i2c總線􀂄 操作電壓范圍為2.7V~6.0V􀂄 低功耗CMOS 技術􀂄 16 字節的頁寫緩沖區􀂄 內置誤寫保護電路-Vcc鎖定-寫保護管腳WP􀂄 復位高電平或低電平有效-精確的電源電壓監控-支持5V,3.3V 和3V 的系統-5個復位門檻電壓可供選擇􀂄 1,000,000個編程/擦除周期􀂄 手動復位􀂄 數據可保存100 年􀂄 8 腳DIP 封裝或8 腳SOIC 封裝􀂄 商業和工業級溫度范圍描述CAT1161/2 為基于微控器的系統提供了一個完整的存儲器和電源監控解決方案。它們利用低功耗CMOS技術將16k帶硬件存儲器寫保護功能的串行EEPROM 存儲器、用于掉電保護的電源監控電路和一個看門狗定時器集成到一塊芯片上。存儲器采用i2c 總線接口。當系統由于軟件或硬件干擾而被終止或“掛起”時,1.6 秒的看門狗電路將復位系統,使系統恢復正常。CAT1161的看門狗電路監控著SDA,這就可以省去額外的PC板跟蹤電路。低價位的CAT1162不含看門狗定時器。電源監控和復位電路可在系統上電/下電時保護存儲器和系統控制器,防止掉電條件的產生。CAT1161/2的5個門檻電壓可支持5V、3.3V和3V的系統。一旦電源電壓超出范圍,復位信號有效,禁止微控制器、ASIC或外圍器件繼續工作。復位信號在電源電壓超過復位門檻電壓后的200ms內仍保持有效。由于帶有高電平和低電平復位信號,因此CAT1161/2可以很方便地連接到微控制器和其它IC。另外,復位管腳還可用作手動按鍵復位的去抖輸入。 CAT1161/2 的存儲器構造成16字節的頁。除此之外,寫保護管腳WP和VCC 檢測電路提供的硬件數據保護功能可防止在Vcc降到低于復位門檻電壓或上電時Vcc上升到復位門檻電壓之前對存儲器的寫操作。器件包含8腳DIP和表貼8腳SOIC兩種封裝形式。

    標簽: EEPROM CMOS i2c 串行

    上傳時間: 2014-03-19

    上傳用戶:蟲蟲蟲蟲蟲蟲

  • i2c總線高頻頭控制程序(Keil C51程序 基于芯片TS

    i2c總線高頻頭控制程序(Keil C51程序 基于芯片TSA5522系列) /*i2c總線高頻頭控制Keil C51程序(PLL芯片為TSA5522系列)                               *///--------------------------------------------------------------------------////                                源程序大公開                              ////                    (c) Copyright 2001-2003 xuwenjun                     ////                            All Rights Reserved                           ////                                    V1.00                                 ////--------------------------------------------------------------------------////標 題: i2c總線高頻頭控制程序(PLL芯片為TSA5522系列)                       ////文件名: xwj_fi1256.c                                                      ////版 本: V1.00                                                             ////修改人: 徐文軍                         E-mail:xuwenjun@21cn.com           ////日 期: 06-02-26 首次公開                                                 ////描 述: i2c總線高頻頭控制程序(PLL芯片為TSA5522系列)                       ////聲 明:                                                                   ////        以下代碼僅免費提供給學習用途,但引用或修改后必須在文件中聲明出處. ////        如用于商業用途請與作者聯系.    E-mail:xuwenjun@21cn.com           ////        有問題請mailto xuwenjun@21cn.com   歡迎與我交流!                  ////--------------------------------------------------------------------------////老版本: 無                             老版本文件名:                      ////創建人: 徐文軍                         E-mail:xuwenjun@21cn.com           ////日 期: 06-02-26                                                          ////描 述:                                                                   ////--------------------------------------------------------------------------//                                                                                                /* 頻率單位為KHz     */#define FUENCY 38900                                                        /* 中頻頻率          */#define PLLdataH(f) ((f+FUENCY)*16/1000/256)        /* 頻率數據高 第1字節*/#define PLLdataL(f) ((f+FUENCY)*16/1000%256)        /* 頻率數據低 第2字節*/#define PLLCON1 0x8e                                                        /* 控制字1    第3字節*/                                                                                                /* 控制字2    第4字節*/#define PLLCON2(f) (((f)<(168000))?(0xa0):(((f)<(450000))?(0x90):(0x30)))#define PLLdata3(fchan) PLLdataH (fchan),PLLdataL (fchan),PLLCON2 (fchan)

    標簽: Keil i2c C51 程序

    上傳時間: 2013-11-10

    上傳用戶:nanfeicui

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