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ADM1034ARQZ-REEL Scheda tecnica(PDF) 11 Page - ON Semiconductor |
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ADM1034ARQZ-REEL Scheda tecnica(HTML) 11 Page - ON Semiconductor |
11 / 39 page ADM1034 http://onsemi.com 11 ADM1034 as before, but send only the data byte containing the register. (See Figure 18.) A read operation is then performed, using the serial bus address and the R/W bit set to 1, followed by the data byte read from the data register. (See Figure 19.) However, if the APR is already at the desired address, data can be read from the corresponding data register without first writing to the APR. In this case, Figure 18 can be omitted. In Figure 17 to Figure 19, the serial bus address is determined by the state of the LOCATION pin on powerup. Figure 17. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register Figure 18. Writing to the Address Pointer Register Only (Send Byte) Figure 19. Reading Data from a Previously Selected Register START BY MASTER STOP BY MASTER ACK. BY ADM1034 ACK. BY ADM1034 ACK. BY ADM1034 A6 11 9 9 A5 A4 A3 A2 A1 A0 R/W D7 D6 D5 D4 D3 D2 D1 D0 SCL SDA FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 ADDRESS POINTER REGISTER BYTE FRAME 3 DATA BYTE SDA (CONTINUED) SCL (CONTINUED) 9 1 D7 D6 D5 D4 D3 D2 D1 D0 STOP BY MASTER ACK. BY ADM1034 ACK. BY ADM1034 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 ADM1034 NO ACK. BY ADM1034 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 ADM1034 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 ADM1034 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. |
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