Datasheet

CS
SCLK
DOUT
DIN
1 16
InvalidData
CS
SCLK
DOUT
DIN
InvalidData
Command:SelectChannels
AIN2andAIN7
NoWritetotheControlRegister
Command:SelectChannelAIN0
ConversionResultforChannelAIN2
ConversionResultforChannelAIN7 ConversionResultforChannelAIN0
NoWritetotheControlRegister
WaitingforConfiguration ConvertingforChannelAIN2 ConvertingforChannelAIN7
ConvertingforChannelAIN0
NoWritetotheControlRegister
WaitingforConfiguration
1
16
1
16
1 16
1 16
¼
¼
¼
¼
ADS8028
www.ti.com 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.
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