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Data Sheet

AD7329

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 = 0 TO 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

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 required only if input ranges

other than the default ranges are required. After the analog input

ranges are configured, a write to the sequence register is necessary

to select the channels to be included in the sequence. After the

channels for the sequence have been selected, the sequence can

be initiated by writing to the control register and setting SEQ1

to 0 and SEQ2 to 1. The AD7329 continues to convert the selected

sequence without interruption if the sequence register remains

unchanged and SEQ1 = 0 and SEQ2 = 1 in the control register.

Rev. C | Page 29 of 38

AD7329 Datasheet(PDF) 30 Page - Analog Devices

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