ADS8168 datasheet(28/78 Pages) TI1

Part #	ADS8168

Description	8-Channel, 16-Bit, 1-MSPS SAR ADC With Easy to Drive Analog Inputs

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CS

Sample

CHA

SCLK

Sample

CH2

Sample

CH6

Data CHA

Data CH2

SDO

24 clocks

MUX OUT = CH6

tCYCLE

MUX

SEQ_START

SDI

SEQSTS

24 clocks

16 clocks

Scan channels AIN2 and AIN6

Data CH6

MUX OUT = CH6

16 clocks

MUX OUT = CHA

MUX OUT = CH2

MUX OUT = CH0

Sample

CH0

28

ADS8168

SBAS817 – NOVEMBER 2017

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Figure 22. Example: Scanning Channels 2 and 6 in Auto Sequence Mode

To repeat a channel sequence indefinitely, set AUTO_REPEAT = 1b. When AUTO_REPEAT bit is enabled, the

MUX will scan through the channels enabled in the AUTO_SEQ_CH[7:0] register and repeat the sequence after

the last channel data has been converted as shown in Figure 23. After converting last channel in the sequence,

the multiplexer does not automatically default to AIN0 unless AIN0 is enabled in AUTO_SEQ_CH[7:0].

As an example, Figure 23 shows the timing diagram when the device is scanning AIN2 and AIN6 in Auto

Sequence mode with AUTO_REPEAT = 1b. At the end of conversion of AIN6, AIN2 is selected as the active

channel and the device continues scanning through the enabled channels again.

To use the device in auto sequence with the repeat mode enabled follow these steps

•

Set SEQ_MODE[1:0] = 10b.

•

Configure the AUTO_SEQ_CH[7:0] register. In Figure 22, AUTO_SEQ_CH = 0x84.

•

AUTO_REPEAT = 1b.

•

SEQ_START = 1b to start executing the sequence.

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