CS

SCLK

DOUT

DIN

1

16

InvalidData

CS

SCLK

DOUT

DIN

InvalidData

Command:SelectChannels

AIN2andAIN7

NoWritetotheControlRegister

Command:SelectChannelAIN0

ConversionResultforChannelAIN2

ConversionResultforChannelAIN7

ConversionResultforChannelAIN0

NoWritetotheControlRegister

WaitingforConfiguration

ConvertingforChannelAIN2

ConvertingforChannelAIN7

ConvertingforChannelAIN0

NoWritetotheControlRegister

WaitingforConfiguration

1

16

1

16

1

16

1

16

¼

¼

¼

¼

ADS8028

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SBAS549B – MAY 2011 – REVISED MARCH 2012

If multiple channels are selected by writing a '1' to all associated bits in the Control Register, the ADS8028

converts all selected channels sequentially (in ascending order) in successive frames as defined by the CS

falling edges. When all selected channels in the Control Register are converted, the ADS8028 stops conversions

and waits for a valid write operation to be executed in the Control Register to select the next channel to be

converted. This operation is shown in Figure 36. DOUT returns all '1's if the conversion sequence is completed

or if no channel is selected. When the ADS8028 begins to convert the first channel in the selected channel

sequence, the WRITE bit in the Control Register must be set to '0' in any subsequent frames to avoid interrupting

the selected sequence.

Figure 36. Configuring a Conversion and Read with the ADS8028

(Numerous Channels Selected for Conversion, REPEAT = 0)

Single or Multiple Channels: Repeated Conversions

The ADS8028 can be programmed to repeatedly convert either a single channel or a sequence of channels

without having to reprogram the Control Register. To operate in this mode, execute a valid write operation to the

Control Register. During this write operation, the REPEAT bit in the Control Register should be set to '1' and the

desired channels should be selected by writing a '1' to the associated bits. Thereafter, the ADS8028 continuously

cycles through the selected channels in ascending order, beginning with the lowest channel and converting all

channels selected in the Control Register. On completion of the sequence, the ADS8028 returns to the first

selected channel in the Control Register and repeats the sequence.

Copyright © 2011–2012, Texas Instruments Incorporated

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