Datenblatt-Suchmaschine für elektronische Bauteile |
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TC74A2-50VCT Datenblatt(PDF) 8 Page - Microchip Technology |
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TC74A2-50VCT Datenblatt(HTML) 8 Page - Microchip Technology |
8 / 16 page TC74 DS21462B-page 8 © 2002 Microchip Technology Inc. FIGURE 3-1: SMBUS PROTOCOLS 3.3 START Condition (S) The TC74 continuously monitors the SDA and SCL lines for a START condition (a HIGH to LOW transition of SDA while SCL 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 A1 and A0 determine the 7-bit SMBus 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 to indicate 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 eight 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 after 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 SCL is HIGH). The STOP Condition must be communicated by the transmitter to the TC74. NOTE: Refer to 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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Ähnliche Beschreibung - TC74A2-50VCT |
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