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AD5647R Datasheet(PDF) 23 Page - Analog Devices |
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AD5647R Datasheet(HTML) 23 Page - Analog Devices |
23 / 30 page Preliminary Technical Data AD5627R/AD5647R/AD5667R, AD5627/AD5667 Rev. PrA. | Page 23 of 30 STOP LEAST SIGNIFICANT DATA BYTE MOST SIGNIFICANT DATA BYTE COMMAND BYTE BLOCK 1 S=1 SLAVE ADDRESS LEAST SIGNIFICANT DATA BYTE MOST SIGNIFICANT DATA BYTE BLOCK 2 S=1 LEAST SIGNIFICANT DATA BYTE MOST SIGNIFICANT DATA BYTE BLOCK n S=1 Figure 56. Multiple Block Write With Initial Command Byte Only (S=1) BROADCAST MODE In addition to the unique slave address for each device, which is set by the address pin(s), The AD56x7 has a broadcast address to which any AD56x7 will respond, irrespective of the state of the address pin(s). This address is 0001000(Write). Where several AD56x7 devices are connected to a bus, they can all be sent the same data using the broadcast address. The broadcast address only works for write operations. It is not possible to read back data from several devices at the same time, due to bus contention. INPUT SHIFT REGISTER The input shift register is 24 bits wide to store the 3 data bytes written to the device of the serial interface. Data written to the device is split into four sections: - One bit to select multiple byte operation. - a three bit command that tells the device what operation to perform. - a three-bit address that tells the device to which DAC or DACs the command applies. - 16 bits of data, which, depending on the command may be written to a DAC or used to define the parameters of a command operation. Bit 23 of the input shift register is reserved, and should always be set to 0 when writing to the device. The command and address are contained in the command byte, the 8 MSBs of the input register. The middle 8 bits are the high byte of the DAC data, while the 8 least significant bits are the low byte of the DAC data or command data. DAC data is left justified, so the two LSBs are unused for the 14 bit AD5647R, and the four LSBs are unused for the 12-bit AD5627R (but they are still used for command data in these devices. The AD56x7 has seven different commands that can be written to it. C2 C1 C0 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D2 D3 D1 D0 S R COMMAND DAC ADDRESS DAC DATA DAC OR COMMAND DATA COMMAND BYTE DATA HIGH BYTE DATA LOW BYTE DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Figure 57. AD5667R/AD5667 Input Shift Register (16-Bit DAC) C2 C1 C0 A2 A1 A0 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D2 D3 D1 D0 S R COMMAND DAC ADDRESS DAC DATA DAC OR COMMAND DATA COMMAND BYTE DATA HIGH BYTE DATA LOW BYTE DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 X X Figure 58. AD5647R Input Shift Register (14-Bit DAC) |
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