AD7329 datasheet(31/39 Pages) AD

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AD7329

Data Sheet

If a change to one of the range registers is required during a

sequence, it is necessary to first stop the sequence by writing to

the control register and setting SEQ1 to 0 and SEQ2 to 0. Next,

write to the range register to change the required range. The

previously selected sequence should then be initiated again by

writing to the control register and setting SEQ1 to 0 and SEQ2

to 1. The ADC converts the first channel in the sequence.

The AD7329 can be configured to convert a sequence of

consecutive channels (see Figure 49). This sequence begins by

converting on Channel 0 and ends with a final channel as

selected by Bit ADD2 to Bit ADD0 in the control register. In

this configuration, there is no need for a write to the sequence

SEQ2 to 0 in the control register, and then select the final channel

in the sequence by programming Bit ADD2 to Bit ADD0 in the

control register.

After the control register is configured to operate the AD7329

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 to 1, the AD7329 is

configured to operate in traditional multichannel mode, where

a write to Channel Address Bit ADD2 to Bit ADD0 in the control

DIN: WRITE TO RANGE REGISTER 1 TO SELECT THE RANGE

FOR 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 CHANNEL 1,

RANGE SELECTED IN RANGE REGISTER 1.

DIN: WRITE TO RANGE REGISTER 2 TO SELECT THE RANGE

FOR ANALOG INPUT CHANNELS.

DOUT: CONVERSION RESULT FROM CHANNEL 0,

RANGE SELECTED IN RANGE REGISTER 1,

SINGLE-ENDED MODE.

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 SELECTED IN RANGE REGISTER 1.

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.

STOP

A SEQUENCE.

Figure 49. Flowchart for Consecutive Sequence of Channels

Rev. C | Page 30 of 38

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