The PCA9557 is a silicon CMOS circuit which provides parallel input/output expansion for SMBus and I2C-bus applications. The PCA9557 consists of an 8-bit input port register, 8-bit output port register, and an I2C-bus/SMBus interface. It has low current consumption and a high-impedance open-drain output pin, IO0. The system master can enable the PCA9557’s I/O as either input or output by writing to the configuration register. The system master can also invert the PCA9557 inputs by writing to the active HIGH polarity inversion register. Finally, the system master can reset the PCA9557 in the event of a time-out by asserting a LOW in the reset input. The power-on reset puts the registers in their default state and initializes the I2C-bus/SMBus state machine. The RESET pin causes the same reset/initialization to occur without de-powering the part.
標(biāo)簽： C-bus SMBus reset port
上傳時間： 2014-01-18
上傳用戶：bs2005
PCA9698 是一款40 位I2C 輸入/輸出擴(kuò)展器，能夠?qū)崿F(xiàn)I2C/SMBus 應(yīng)用中40 位GPIO 的擴(kuò)展
標(biāo)簽： 9698 PCA I2C 擴(kuò)展芯片
上傳時間： 2013-11-21
上傳用戶：文993
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(biāo)簽： extender P82B715 Using I2C
上傳時間： 2014-12-28
上傳用戶：lou45566
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(shí)現(xiàn)了完善的雙向同步數(shù)據(jù)傳送，可以極方便地構(gòu)成多機(jī)系統(tǒng)和外圍器件擴(kuò)展系統(tǒng)。I2C 總線采用了器件地址的硬件設(shè)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(tǒng)具有最簡單而靈活的擴(kuò)展方法。I2C 總線的2 根線（串行數(shù)據(jù)——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(yīng)有一個唯一的地址，而且都可以作為一個發(fā)送器或接收器。此外，器件在執(zhí)行數(shù)據(jù)傳輸時也可以被看作是主機(jī)或從機(jī)。
上傳時間： 2013-11-05
上傳用戶：qb1993225
本實(shí)驗(yàn)是基于EasyFPGA030的I2C總線接口模塊設(shè)計(jì)，用EasyFPGA030開發(fā)套件通過I2C協(xié)議實(shí)現(xiàn)對二線制I2C串行EEPROM的讀寫操作，先把數(shù)據(jù)寫入EEPROM，然后再讀取出來顯示在數(shù)碼管上
標(biāo)簽： I2C 總線接口 模塊設(shè)計(jì)
上傳時間： 2013-10-21
上傳用戶：edisonfather
關(guān)鍵詞 CAT9534、I2C 總線、SMBus、I/O 擴(kuò)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(kuò)展器件
上傳時間： 2013-10-21
上傳用戶：rocwangdp
關(guān)鍵詞 I2C/SMBus、I/O 口擴(kuò)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(kuò)展器件
上傳時間： 2013-12-31
上傳用戶：woshinimiaoye
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(biāo)簽： software driver XA-S I2C
上傳時間： 2013-11-02
上傳用戶：zw380105939
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(biāo)簽： routines slave I2C 87L
上傳時間： 2013-11-19
上傳用戶：shirleyYim
帶I2C串行CMOS EEPROM、精密復(fù)位控制器和看門狗定時器的監(jiān)控電路 特性 看門狗監(jiān)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(shù) 16 字節(jié)的頁寫緩沖區(qū) 內(nèi)置誤寫保護(hù)電路－Vcc鎖定－寫保護(hù)管腳WP 復(fù)位高電平或低電平有效－精確的電源電壓監(jiān)控－支持5V，3.3V 和3V 的系統(tǒng)－5個復(fù)位門檻電壓可供選擇 1,000,000個編程/擦除周期 手動復(fù)位 數(shù)據(jù)可保存100 年 8 腳DIP 封裝或8 腳SOIC 封裝 商業(yè)和工業(yè)級溫度范圍描述CAT1161/2 為基于微控器的系統(tǒng)提供了一個完整的存儲器和電源監(jiān)控解決方案。它們利用低功耗CMOS技術(shù)將16k帶硬件存儲器寫保護(hù)功能的串行EEPROM 存儲器、用于掉電保護(hù)的電源監(jiān)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(dāng)系統(tǒng)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(fù)位系統(tǒng)，使系統(tǒng)恢復(fù)正常。CAT1161的看門狗電路監(jiān)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(jiān)控和復(fù)位電路可在系統(tǒng)上電/下電時保護(hù)存儲器和系統(tǒng)控制器，防止掉電條件的產(chǎn)生。CAT1161/2的5個門檻電壓可支持5V、3.3V和3V的系統(tǒng)。一旦電源電壓超出范圍，復(fù)位信號有效，禁止微控制器、ASIC或外圍器件繼續(xù)工作。復(fù)位信號在電源電壓超過復(fù)位門檻電壓后的200ms內(nèi)仍保持有效。由于帶有高電平和低電平復(fù)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(fù)位管腳還可用作手動按鍵復(fù)位的去抖輸入。 CAT1161/2 的存儲器構(gòu)造成16字節(jié)的頁。除此之外，寫保護(hù)管腳WP和VCC 檢測電路提供的硬件數(shù)據(jù)保護(hù)功能可防止在Vcc降到低于復(fù)位門檻電壓或上電時Vcc上升到復(fù)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。
上傳時間： 2014-03-19
上傳用戶：蟲蟲蟲蟲蟲蟲
蟲蟲下載站版權(quán)所有 京ICP備2021023401號-1
