AD7329 datasheet(29/40 Pages) AD

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AD7329

Rev. 0 | Page 29 of 40

SEQUENCER OPERATION

DIN: WRITE TO RANGE REGISTER 1 TO SELECT THE RANGE

FOR EACH ANALOG INPUT CHANNEL.

DOUT: CONVERSION RESULT FROM CHANNEL 0, ±10V

RANGE, SINGLE-ENDED MODE.

DIN: TIE DIN LOW/WRITE BIT = 0TO CONTINUE TO CONVERT

THROUGH THE SEQUENCE OF CHANNELS.

DOUT: CONVERSION RESULT FROM FIRST CHANNEL IN

THE SEQUENCE.

DIN: WRITE TO SEQUENCE REGISTER TO SELECT THE

NEW SEQUENCE.

DOUT: CONVERSION RESULT FROM CHANNEL X IN

THE FIRST SEQUENCE.

DIN: WRITE TO RANGE REGISTER 2 TO SELECT THE RANGE

FOR EACH ANALOG INPUT CHANNEL.

DOUT: CONVERSION RESULT FROM CHANNEL 0,

SINGLE-ENDED MODE, RANGE SELECTED IN

RANGE REGISTER 1.

DIN: WRITE TO CONTROL REGISTER TO START THE

SEQUENCE, Seq1 = 0, Seq2 = 1.

DOUT: CONVERSION RESULT FROM CHANNEL 0,

SINGLE-ENDED MODE, RANGE SELECTED IN

RANGE REGISTER 1.

DIN: WRITE TO SEQUENCE REGISTER TO SELECT THE

ANALOG INPUT CHANNELS TO BE INCLUDED IN

THE SEQUENCE.

DOUT: CONVERSION RESULT FROM CHANNEL 0,

SINGLE-ENDED MODE, RANGE SELECTED IN

RANGE REGISTER 1.

POWER ON.

CONTINUOUSLY CONVERT

ON THE SELECTED SEQUENCE

OF CHANNELS.

DIN TIED LOW/WRITE BIT = 0.

SELECT A NEW SEQUENCE.

DIN: WRITE TO CONTROL

SEQUENCE, Seq1 = 0, Seq2 = 0.

DOUT: CONVERSION RESULT

FROM CHANNEL IN SEQUENCE.

STOP

A SEQUENCE.

Figure 48. Programmable Sequence Flowchart

The AD7329 can be configured to automatically cycle through

a number of selected channels using the on-chip sequence

Figure 48 shows how to program the AD7329 register to

operate in sequence mode.

After power-up, the four on-chip registers contain default

values. Each analog input has a default input range of ±10 V. If

different analog input ranges are required, a write to the range

registers is necessary. This is shown in the first two serial

transfers of Figure 48.

These two initial serial transfers are only necessary if input

ranges other than the default ranges are required. After the

analog input ranges are configured, a write to the sequence

sequence. Once the channels for the sequence have been

selected, the sequence can be initiated by writing to the control

continues to convert the selected sequence without interruption

provided that the sequence register remains unchanged and

Seq1 = 0 and Seq2 = 1 in the control register.

AD7329 Datasheet(PDF) 29 Page - Analog Devices

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