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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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TC74A4-3.3VAT 데이터시트(PDF) 7 Page - Microchip Technology |
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TC74A4-3.3VAT 데이터시트(HTML) 7 Page - Microchip Technology |
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7 / 18 page  2001-2012 Microchip Technology Inc. DS21462D-page 7 TC74 FIGURE 3-1: SMBus/I2C Protocols. 3.3 START Condition (S) The TC74 continuously monitors the SDA and SCLK lines for a START condition (a high-to-low transition of SDA while SCLK is high) and will not respond until this condition is met. 3.4 Address Byte Immediately following the START condition, the host must transmit the address byte to the TC74. The states of A2, A1 and A0 determine the SMBus/I2C address for the TC74. The 7-bit address transmitted in the serial bit stream must match for the TC74 to respond with an Acknowledge (indicating the TC74 is on the bus and ready to accept data). The 8-bit in the address byte is a Read/Write bit. This bit is a ‘1’ for a read operation or ‘0’ for a write operation. During the first phase of any transfer, this bit will be set = 0, indicating that the command byte is being written. 3.5 Acknowledge (ACK) Acknowledge (ACK) provides a positive handshake between the host and the TC74. The host releases SDA after transmitting 8 bits. The host then generates a ninth clock cycle to allow the TC74 to pull the SDA line low. This action acknowledges that the TC74 successfully received the previous 8 bits of data or address. 3.6 Data Byte After a successful ACK of the address byte, the host must transmit the data byte to be written, or clock-in the data to be read (see the appropriate timing diagrams). ACK will be generated upon a successful write of a data byte into the TC74. 3.7 STOP Condition (P) Communications must be terminated by a STOP condition (a low-to-high transition of SDA while SCLK is high). The STOP condition must be communicated by the transmitter to the TC74. Refer to Figure 1-1, “Timing Diagrams”, for serial bus timing. S Address WR ACK Command ACK Data ACK P 8 Bits 7 Bits 8 Bits Slave Address Command Byte: selects which register you are writing to. Data Byte: data goes into the register set by the command byte. Write Byte Format Read Byte Format S Address WR ACK Command ACK S Address RD ACK Data NACK P 7 Bits 8 Bits 7 Bits 8 Bits Slave Address Command Byte: selects which register you are reading from. Slave Address: repeated due to change in data- flow direction. Data Byte: reads from the register set by the command byte. Receive Byte Format S Address RD ACK Data NACK P 7 Bits 8 Bits Data Byte: reads data from the register commanded by the last Read Byte or Write Byte transmission. S = START Condition P = STOP Condition Shaded = Slave Transmission |
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