EVAL-AD7321CB【PDF 26/36 页】500 kSPS, 2-Channel, Software-Selectable

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AD7321

SEQUENCER OPERATION

The AD7321 can be configured to convert a sequence of

consecutive channels (see

Figure 44). This sequence begins by

converting on Channel 0 and ends with a final channel as selected

by Bit ADD0 in the control register. In this configuration, there is

no need for a write to the sequence register. To operate the AD7321

in this mode, set Seq1 to 1 and Seq2 to 0, and then select the final

channel in the sequence by programming Bit ADD0 in the control

Rev. 0 | Page 26 of 36

Once the control register is configured to operate the AD7321

in this mode, the DIN line can be held low, or the write bit can

be set to 0. To return to traditional multichannel operation, a

write to the control register to set Seq1 to 0 and Seq2 to 0 is

necessary.

When Seq1 and Seq2 are both set to 0, or when both are set to

1, the AD7321 is configured to operate in traditional multi-

channel mode, where a write to Channel Address Bit ADD0 in

the control register selects the next channel for conversion.

DIN: WRITE TO RANGE REGISTER TO SELECT THE RANGE

FOR THE ANALOG INPUT CHANNELS.

DOUT: CONVERSION RESULT FROM CHANNEL 0, ±10V

RANGE, SINGLE-ENDED MODE.

DIN: WRITE BIT = 0 OR DIN LINE HELD LOW TO CONTINUE

THROUGH SEQUENCE OF CONSECUTIVE CHANNELS.

DOUT: CONVERSION RESULT FROM CHANNEL1, RANGE AS

SELECTED IN RANGE REGISTER.

DIN: WRITE BIT = 0 OR DIN LINE HELD LOW TO CONTINUE

TO CONVERT THROUGH THE SEQUENCE OF

CONSECUTIVE CHANNELS.

DOUT: CONVERSION RESULT FROM CHANNEL 0, RANGE AS

SELECTED IN RANGE REGISTER.

DIN: WRITE TO CONTROL REGISTER TO SELECT THE FINAL

CHANNEL IN THE CONSECUTIVE SEQUENCE, SET Seq1 = 1

AND Seq2 = 0. SELECT OUTPUT CODING FOR SEQUENCE.

DOUT: CONVERSION RESULT FROM CHANNEL 0,

RANGE SELECTED IN RANGE REGISTER 1,

SINGLE-ENDED MODE.

POWER ON.

DIN TIED LOW/WRITE BIT = 0.

CONTINUOUSLY CONVERT

ON CONSECUTIVE SEQUENCE

OF CHANNELS.

DIN: WRITE TO CONTROL

SEQUENCE, Seq1 = 0, Seq2 = 0.

DOUT: CONVERSION RESULT

FROM CHANNEL IN SEQUENCE.

STOPPING

A SEQUENCE.

Figure 44. Flowchart for Consecutive Sequence of Channels

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