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ADT7470 Datasheet(PDF) 11 Page - Analog Devices |
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ADT7470 Datasheet(HTML) 11 Page - Analog Devices |
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11 / 41 page  ADT7470 Data Sheet Rev. E | Page 10 of 40 during the low period before the 10th clock pulse, then high during the 10th clock pulse to assert a stop condition. 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 ADT7470, 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. 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, 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 7. The device address is sent over the bus followed by R/W set to 0. This is followed by two data bytes. 1 00 1 1 1 A1 A0 R/W 99 1 1 D7 D6 D5 D4 D3 D2 D1 D0 9 D7 D6 D5 D4 D3 D2 D1 D0 SCL SDA SCL (CONTINUED) SDA (CONTINUED) START BY MASTER ACK. BY ADT7470 ACK. BY ADT7470 ACK. BY ADT7470 STOP BY MASTER FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 ADDRESS POINTER REGISTER BYTE FRAME 3 DATA BYTE Figure 7. Writing a Register Address to the Address Pointer Register, Then Writing Data to the Selected Register SCL SDA 1 01 0 1 1 A1 A0 START BY MASTER FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 ADDRESS POINTER REGISTER BYTE STOP BY MASTER ACK. BY ADT7470 ACK. BY ADT7470 R/W D7 D6 D5 D4 D3 D2 D1 D0 99 1 Figure 8. Writing to the Address Pointer Register Only SCL SDA 1 01 0 1 1 A1 A0 START BY MASTER FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 DATA BYTE FROM ADT7470 STOP BY MASTER ACK. BY ADT7470 NO ACK. BY MASTER R/W D7 D6 D5 D4 D3 D2 D1 D0 99 1 Figure 9. Reading Data from a Previously Selected Register |
Número de pieza similar - ADT7470 |
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Descripción similar - ADT7470 |
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