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ADM1030ARQ-REEL7 Datenblatt(PDF) 8 Page - ON Semiconductor |
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ADM1030ARQ-REEL7 Datenblatt(HTML) 8 Page - ON Semiconductor |
8 / 29 page REV. A ADM1030 –8– In the case of the ADM1030, 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 that the correct data register is addressed; data can then 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 2a. The device address is sent over the bus followed by R/W 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 ADM1030’s 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 ADM1030 as before, but only the data byte containing the register address is sent, as data is not to be written to the register. This is shown in Figure 2b. 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 2c. 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 2b can be omitted. NOTES 1. Although it is possible to read a data byte from a data register without first writing to the Address Pointer Register, if the Address Pointer Register is already at the correct value, it is not possible to write data to a register without writing to the Address Pointer Register, because the first data byte of a write is always written to the Address Pointer Register. 2. In Figures 2a to 2c, the serial bus address is shown as the default value 01011(A1)(A0), where A1 and A0 are set by the three-state ADD pin. 3. The ADM1030 also supports the Read Byte protocol, as described in the System Management Bus specification. R/W 0 SCL SDA 10 1 1 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 ACK. BY ADM1030 START BY MASTER 19 1 ACK. BY ADM1030 9 D7 D6 D5 D4 D3 D2 D1 D0 ACK. BY ADM1030 STOP BY MASTER 1 9 SCL (CONTINUED) SDA (CONTINUED) FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 ADDRESS POINTER REGISTER BYTE FRAME 3 DATA BYTE Figure 2a. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register R/W 0 SCL SDA 10 1 1 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 ACK. BY ADM1030 START BY MASTER 19 1 ACK. BY ADM1030 9 FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 ADDRESS POINTER REGISTER BYTE STOP BY MASTER Figure 2b. Writing to the Address Pointer Register Only R/W 0 SCL SDA 10 1 1 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 NO ACK. BY MASTER START BY MASTER 19 1 ACK. BY ADM1030 9 FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 DATA BYTE FROM ADM1030 STOP BY MASTER Figure 2c. Reading Data from a Previously Selected Register Rev. 2 | Page 8 of 29 | www.onsemi.com |
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