AD7367-5ARUZ AD [Analog Devices], AD7367-5ARUZ Datasheet - Page 29

• Manufacturer Part Number: AD7367-5ARUZ
• Description: 1 MSPS, 8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC
• Manufacturer: AD [Analog Devices]

SEQUENCER OPERATION
The AD7329 can be configured to automatically cycle through
a number of selected channels using the on-chip sequence
register with the Seq1 bit and the Seq2 bit in the control register.
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.
CS
FROM CHANNEL IN SEQUENCE.
SEQUENCE, Seq1 = 0, Seq2 = 0.
DOUT: CONVERSION RESULT
DIN: WRITE TO CONTROL
REGISTER TO STOP THE
CS
CS
CS
CS
CS
CS
Figure 48. Programmable Sequence Flowchart
A SEQUENCE.
DIN: TIE DIN LOW/WRITE BIT = 0TO CONTINUE TO CONVERT
DIN: WRITE TO RANGE REGISTER 1 TO SELECT THE RANGE
DIN: WRITE TO RANGE REGISTER 2 TO SELECT THE RANGE
DOUT: CONVERSION RESULT FROM FIRST CHANNEL IN
DIN: WRITE TO SEQUENCE REGISTER TO SELECT THE
DIN: WRITE TO SEQUENCE REGISTER TO SELECT THE
DOUT: CONVERSION RESULT FROM CHANNEL 0, ±10V
STOP
DIN: WRITE TO CONTROL REGISTER TO START THE
DOUT: CONVERSION RESULT FROM CHANNEL X IN
DOUT: CONVERSION RESULT FROM CHANNEL 0,
DOUT: CONVERSION RESULT FROM CHANNEL 0,
DOUT: CONVERSION RESULT FROM CHANNEL 0,
ANALOG INPUT CHANNELS TO BE INCLUDED IN
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SINGLE-ENDED MODE, RANGE SELECTED IN
SINGLE-ENDED MODE, RANGE SELECTED IN
SINGLE-ENDED MODE, RANGE SELECTED IN
THROUGH THE SEQUENCE OF CHANNELS.
SELECT A NEW SEQUENCE.
FOR EACH ANALOG INPUT CHANNEL.
FOR EACH ANALOG INPUT CHANNEL.
RANGE, SINGLE-ENDED MODE.
SEQUENCE, Seq1 = 0, Seq2 = 1.
THE FIRST SEQUENCE.
RANGE REGISTER 1.
RANGE REGISTER 1.
RANGE REGISTER 1.
NEW SEQUENCE.
THE SEQUENCE.
THE SEQUENCE.
POWER ON.
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
register is necessary to select the channels to be included in the
sequence. Once 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
provided that the sequence register remains unchanged and
Seq1 = 0 and Seq2 = 1 in the control register.
ON THE SELECTED SEQUENCE
CONTINUOUSLY CONVERT
OF CHANNELS.
DIN TIED LOW/WRITE BIT = 0.
AD7329