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AD5933 Datasheet(PDF) 23 Page - Analog Devices |
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AD5933 Datasheet(HTML) 23 Page - Analog Devices |
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23 / 40 page  Data Sheet AD5933 Rev. F | Page 23 of 40 REGISTER MAP Table 8. Register Name Register Data Function 0x80 Control D15 to D8 Read/write 0x81 D7 to D0 Read/write 0x82 Start frequency D23 to D16 Read/write 0x83 D15 to D8 Read/write 0x84 D7 to D0 Read/write 0x85 Frequency increment D23 to D16 Read/write 0x86 D15 to D8 Read/write 0x87 D7 to D0 Read/write 0x88 Number of increments D15 to D8 Read/write 0x89 D7 to D0 Read/write 0x8A Number of settling time cycles D15 to D8 Read/write 0x8B D7 to D0 Read/write 0x8F Status D7 to D0 Read only 0x92 Temperature data D15 to D8 Read only 0x93 D7 to D0 Read only 0x94 Real data D15 to D8 Read only 0x95 D7 to D0 Read only 0x96 Imaginary data D15 to D8 Read only 0x97 D7 to D0 Read only CONTROL REGISTER (REGISTER ADDRESS 0x80, REGISTER ADDRESS 0x81) The AD5933 has a 16-bit control register (Register Address 0x80 and Register Address 0x81) that sets the AD5933 control modes. The default value of the control register upon reset is as follows: D15 to D0 reset to 0xA000 upon power-up. The four MSBs of the control register are decoded to provide control functions, such as performing a frequency sweep, powering down the part, and controlling various other functions defined in the control register map. The user may choose to write only to Register Address 0x80 and not to alter the contents of Register Address 0x81. Note that the control register should not be written to as part of a block write command. The control register also allows the user to program the excitation voltage and set the system clock. A reset command to the control register does not reset any programmed values associated with the sweep (that is, start frequency, number of increments, frequency increment). After a reset command, an initialize with start frequency command must be issued to the control register to restart the frequency sweep sequence (see Figure 28). Table 9. Control Register Map (D15 to D12) D15 D14 D13 D12 Function 0 0 0 0 No operation 0 0 0 1 Initialize with start frequency 0 0 1 0 Start frequency sweep 0 0 1 1 Increment frequency 0 1 0 0 Repeat frequency 1 0 0 0 No operation 1 0 0 1 Measure temperature 1 0 1 0 Power-down mode 1 0 1 1 Standby mode 1 1 0 0 No operation 1 1 0 1 No operation Table 10. Control Register Map (D10 to D9) D10 D9 Range No. Output Voltage Range 0 0 1 2.0 V p-p typical 0 1 4 200 mV p-p typical 1 0 3 400 mV p-p typical 1 1 2 1.0 V p-p typical |
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