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ADM1033 Scheda tecnica(PDF) 11 Page - ON Semiconductor |
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ADM1033 Scheda tecnica(HTML) 11 Page - ON Semiconductor |
11 / 35 page ADM1033 http://onsemi.com 11 Figure 18. Writing to the Address Pointer Register Only (Send Byte) Figure 19. Reading Data from a Previously Selected Register STOP BY MASTER ACK. BY ADM1033 ACK. BY ADM1033 START BY MASTER SCL 11 9 9 FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 ADDRESS POINTER REGISTER BYTE A6 A5 A4 A3 A2 A1 A0 R/W D7 D6 D5 D4 D3 D2 D1 D0 SDA STOP BY MASTER START BY MASTER ACK. BY ADM1033 NO ACK. BY ADM1033 R/W SCL 11 9 9 SDA A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 DATA BYTE FROM ADM1034 Register Addresses for Single/Block Byte Modes The ADM1033 supports single byte as well as block read and write operations. The register address determines whether a single byte or multiple byte (block) operation is run. For a single byte operation, the MSB of the register address is set to 0; for a multiple byte operation, it is set to 1. The number of bytes read in a multiple byte operation is set in the #Bytes/Block Read Register at Address 0x00. The number of bytes written to the ADM1033 is specified during the block write operation. The addresses quoted in the register map and throughout this data sheet assume single byte operation. For multiple byte operations, set the MSB of each register address to 1. Write Operations The SMBus specifications define protocols for read and write operations. The ADM1033 supports send byte, write byte, and block byte SMBus write protocols. The following abbreviations are used in the diagrams: S—START P—STOP R—READ W—WRITE A—ACKNOWLEDGE A—NO ACKNOWLEDGE Send Byte In this operation, the master device sends a single−command byte to a slave device as follows: 1. The master device asserts a start condition on SDA. 2. The master sends a 7−bit address followed by the write bit (low). 3. The addressed slave device asserts ACK on SDA. 4. The master sends the register address. 5. The slave asserts ACK on SDA. 6. The master asserts a stop condition on SDA, and the transaction ends. Figure 20. Send Byte SLAVE ADDRESS S REG ADDRESS W A A P The ADM1033 uses the send byte operation to write a register address to the APR for a subsequent read from the same address. (See Figure 24.) The user may be required to read data from the register immediately after setting up the address. If so, the master can assert a repeat start condition immediately after the final ACK and carry out a single byte read without asserting an intermediate stop condition. Write Byte In this operation, the master device sends a register address and one data byte to the slave device as follows: 1. The master asserts a start condition on SDA. 2. The master sends the 7−bit slave address followed by a write bit (low). 3. The addressed slave device asserts ACK on SDA. 4. The master sends the register address. The MSB of the register address should equal 0 for a write byte operation. If the MSB equals 1, a block write operation takes place. 5. The slave asserts ACK on SDA. 6. The master sends a data byte. 7. The slave asserts ACK on SDA. 8. The master asserts a stop condition on SDA to end the transaction. Figure 21. Write Byte Operation SLAVE ADDRESS S REG ADDRESS DATA W A A A P |
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