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PCA9544A 是NXP 公司生產的i2c 總線多路復用器，通過該器件可以將一路i2c 總線擴展為4 路i2c 總線。將1 路上行SDA/SCL 通道擴展為4 路下行通道。通過對內部可編程寄存器進行配置，在同一時間可以任意選擇一對SCx/SDx 線。器件擁有四路輸入中斷，INT0到INT3，分別對應著四路下行通道。該器件還有一個輸出中斷，輸出中斷的狀態由四個輸入中斷通過“與”邏輯控制。
上傳時間： 2013-11-17
上傳用戶：woshinimiaoye
PCA9545A/45B/45C 是一款i2c 總線擴展器件，通過它可以將一路i2c 總線擴展為四路，在對內部控制寄存器進行相應配置后，可同時選擇一路或者多路下行i2c 總線與上行i2c 總線相連。該器件具有四個中斷輸入INT0 - INT3 和一個中斷輸出INT ，分別對應四路下行i2c總線和一路上行i2c 總線，四個中斷輸入相“與”后控制中斷輸出INT 狀態。
上傳時間： 2014-01-25
上傳用戶：ainimao
The PCA9546A is a quad bidirectional translating switch controlled via the i2c-bus. TheSCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individualSCx/SDx channel or combination of channels can be selected, determined by thecontents of the programmable control register.
上傳時間： 2013-11-16
上傳用戶：cc1915
The PCA9555 is a 24-pin CMOS device that provides 16 bits of General Purpose parallelInput/Output (GPIO) expansion for i2c-bus/SMBus applications and was developed toenhance the NXP Semiconductors family of i2c-bus I/O expanders. The improvementsinclude higher drive capability, 5 V I/O tolerance, lower supply current, individual I/Oconfiguration, and smaller packaging. I/O expanders provide a simple solution whenadditional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc.The PCA9555 consists of two 8-bit Configuration (Input or Output selection); Input, Outputand Polarity Inversion (active HIGH or active LOW operation) registers. The systemmaster can enable the I/Os as either inputs or outputs by writing to the I/O configurationbits. The data for each Input or Output is kept in the corresponding Input or Outputregister. The polarity of the read register can be inverted with the Polarity Inversionregister. All registers can be read by the system master. Although pin-to-pin and i2c-busaddress compatible with the PCF8575, software changes are required due to theenhancements, and are discussed in Application Note AN469.
上傳時間： 2013-11-13
上傳用戶：fredguo
PCA9546A 是一款i2c 多路復用器和開關，能實現i2c 總線擴展、電平轉換及總線功能恢復
上傳時間： 2013-12-02
上傳用戶：myworkpost
The PCA9547 is an octal bidirectional translating multiplexer controlled by the i2c-bus.The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Only oneSCx/SDx channel can be selected at a time, determined by the contents of theprogrammable control register. The device powers up with Channel 0 connected, allowingimmediate communication between the master and downstream devices on that channel.
上傳時間： 2014-12-28
上傳用戶：270189020
PCA9547 是一款通過i2c 總線控制的八進制雙向轉換開關。它的每對SCL/ SDA 上行通道可以擴展為八對下行通道。但在某一時刻，由可編程控制寄存器中的內容來決定只有一路SCx/SDx 被選擇。由多路復用器的通門，VDD 管腳可以用來限制PCA9547 通過的最高電壓，這使得每一對SCL/SDA 可以使用不同的總線電壓，因此1.8V、2.5V 或3.3V 的器件都可以在無其它保護的情況下與5V 的器件進行通信。它的外部上拉電阻將總線拉高至每個通道所要求的電壓電平，所有I/O 管腳都可以承受5V 的電壓。設備上電時由通道0 連接，并且允許主機和下行設備進行直接的通信
上傳時間： 2014-12-28
上傳用戶：sunshine1402
The PCA9548A is an octal bidirectional translating switch controlled via the i2c-bus. TheSCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individualSCx/SDx channel or combination of channels can be selected, determined by thecontents of the programmable control register.An active LOW reset input allows the PCA9548A to recover from a situation where one ofthe downstream i2c-buses is stuck in a LOW state. Pulling the RESET pin LOW resets thei2c-bus state machine and causes all the channels to be deselected as does the internalPower-on reset function.
上傳時間： 2013-10-13
上傳用戶：bakdesec
PCA9548A 是一款通過i2c 總線控制的八進制雙向轉換開關。它的每對SCL/ SDA 上行通道可以擴展為八對下行通道，可以通過可編程控制寄存器的內容來選擇任意單一的SCx/SDx 通道或者組合通道。由多路復用器的通門，VDD 管腳可以用來限制PCA9547 通過的最高電壓，這使得每一對SCL/SDA 都可以使用不同的總線電壓，因此1.8V、2.5V 或3.3V的器件可以在無其它保護的情況下與5V 的器件進行通信。它的外部上拉電阻將總線拉高至每個通道所要求的電壓電平，所有I/O 管腳都可以承受5V 電壓。
上傳時間： 2013-10-13
上傳用戶：hanli8870
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.
上傳時間： 2014-01-18
上傳用戶：bs2005
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