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ADM1027ARQZ-REEL 데이터시트(PDF) 9 Page - ON Semiconductor |
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ADM1027ARQZ-REEL 데이터시트(HTML) 9 Page - ON Semiconductor |
9 / 56 page REV. A ADM1027 –9– Any number of bytes of data can be transferred over the serial bus in one operation. However, it is not possible to mix read and write in one operation because the type of operation is determined at the beginning and subsequently cannot be changed without starting a new operation. In the case of the ADM1027, write operations contain either one or two bytes, and read operations contain one byte and perform the following functions: To write data to one of the device data registers or read data from it, the address pointer register must be set so the correct data register is addressed, then data can be written into that register or read from it. The first byte of a write operation always contains an address that is stored in the address pointer register. If data is to be written to the device, then the write operation contains a second data byte that is written to the register selected by the address pointer register. This is illustrated in Figure 6. The device address is sent over the bus followed by R/W being set to 0. This is followed by two data bytes. The first data byte is the address of the internal data register to be written to, which is stored in the address pointer register. The second data byte is the data to be written to the internal data register. When reading data from a register, there are two possibilities: 1. If the ADM1027 address pointer register value is unknown or not the desired value, it is first necessary to set it to the correct value before data can be read from the desired data register. This is done by performing a write to the ADM1027 as before, but only sending the data byte containing the register address, as data is not to be written to the register. This is shown in Figure 7. A read operation is then performed consisting of the serial bus address, R/W bit set to 1, followed by the data byte read from the data register. This is shown in Figure 8. 2. If the address pointer register is known to be already at the desired address, data can be read from the corresponding data register without first writing to the address pointer register, so Figure 7 can be omitted. R/ W 0 SCL SDA 1 0 1 1 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 ACK. BY ADM1027 START BY MASTER FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 ADDRESS POINTER REGISTER BYTE 1 9 1 ACK. BY ADM1027 9 D7 D6 D5 D4 D3 D2 D1 D0 ACK. BY ADM1027 STOP BY MASTER FRAME 3 DATA BYTE 1 9 SCL (CONTINUED) SDA (CONTINUED) Figure 6. Writing a Register Address to the Address Pointer Register, Then Writing Data to the Selected Register R/ W 0 SCL SDA 1 0 1 1 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 ACK. BY ADM1027 STOP BY MASTER START BY MASTER FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 ADDRESS POINTER REGISTER BYTE 1 9 1 ACK. BY ADM1027 9 Figure 7. Writing to the Address Pointer Register Only R/ W 0 SCL SDA 1 0 1 1 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 NO ACK. BY MASTER STOP BY MASTER START BY MASTER FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 DATA BYTE FROM ADM1027 1 9 1 ACK. BY ADM1027 9 Figure 8. Reading Data from a Previously Selected Register Rev. 3 | Page 9 of 56 | www.onsemi.com |
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