EVAL-AD7321CB AD [Analog Devices], EVAL-AD7321CB Datasheet - Page 26

• Manufacturer Part Number: EVAL-AD7321CB
• Description: 500 kSPS, 2-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC
• Manufacturer: AD [Analog Devices]

AD7321
SEQUENCER OPERATION
The AD7321 can be configured to convert a sequence of
consecutive channels (see
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
register.
CS
CS
CS
CS
Figure 44). This sequence begins by
DOUT: CONVERSION RESULT FROM CHANNEL 0, RANGE AS
DIN: WRITE TO CONTROL REGISTER TO SELECT THE FINAL
DOUT: CONVERSION RESULT FROM CHANNEL1, RANGE AS
CHANNEL IN THE CONSECUTIVE SEQUENCE, SET Seq1 = 1
DIN: WRITE TO RANGE REGISTER TO SELECT THE RANGE
AND Seq2 = 0. SELECT OUTPUT CODING FOR SEQUENCE.
DIN: WRITE BIT = 0 OR DIN LINE HELD LOW TO CONTINUE
DIN: WRITE BIT = 0 OR DIN LINE HELD LOW TO CONTINUE
CS
DOUT: CONVERSION RESULT FROM CHANNEL 0, ±10V
THROUGH SEQUENCE OF CONSECUTIVE CHANNELS.
DOUT: CONVERSION RESULT FROM CHANNEL 0,
TO CONVERT THROUGH THE SEQUENCE OF
RANGE SELECTED IN RANGE REGISTER 1,
FOR THE ANALOG INPUT CHANNELS.
Figure 44. Flowchart for Consecutive Sequence of Channels
SELECTED IN RANGE REGISTER.
SELECTED IN RANGE REGISTER.
FROM CHANNEL IN SEQUENCE.
RANGE, SINGLE-ENDED MODE.
SEQUENCE, Seq1 = 0, Seq2 = 0.
DOUT: CONVERSION RESULT
CONSECUTIVE CHANNELS.
DIN: WRITE TO CONTROL
REGISTER TO STOP THE
SINGLE-ENDED MODE.
A SEQUENCE.
POWER ON.
STOPPING
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ON CONSECUTIVE SEQUENCE
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.
CONTINUOUSLY CONVERT
OF CHANNELS.
DIN TIED LOW/WRITE BIT = 0.