ADS7028 datasheet(21/70 Pages) TI1

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Sample

AINx

SCLK

Sample

AIN2

Sample

AIN6

Data AINx

Data AIN2

SDO

24 clocks

MUX OUT = AIN6

tCYCLE

MUX

SEQ_START

SDI

12 clocks

Scan channels AIN2 and AIN6 and repeat

Data AIN6

MUX OUT = AIN2

MUX OUT = AINx

Sample

AIN2

Data AIN2

MUX OUT = AIN6

Sample

AIN6

MUX OUT = AIN2

ADS7038

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SBAS979 – JUNE 2019

Product Folder Links: ADS7038

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The number of clocks required for reading the output data depends on the device output data frame size; see the

Output Data Format section for more details.

8.4.4 Auto-Sequence Mode

In auto-sequence mode, the internal channel sequencer switches the multiplexer to the next analog input

channel after every conversion. The desired analog input channels can be configured for sequencing in the

AUTO_SEQ_CHSEL register. To enable the channel sequencer, set SEQ_START = 1b. After every conversion,

the channel sequencer switches the multiplexer to the next analog input in ascending order. To stop the channel

sequencer from selecting channels, set SEQ_START = 0b.

In the example shown in Figure 17, AIN2 and AIN6 are enabled for sequencing in AUTO_SEQ_CHSEL. The

channel sequencer loops through AIN2 and AIN6 and repeats until SEQ_START is set to 0b. The number of

clocks required for reading the output data depends on the device output data frame size; see the Output Data

Format section for more details.

Figure 17. Starting Conversions and Reading Data in Auto-Sequence Mode

8.4.5 Autonomous Mode

In autonomous mode, the device can be programmed to monitor the voltage applied on the analog input pins of

the device and generate an ALERT signal internal to the device when the programmable high or low threshold

values are crossed. The internal ALERT signal can be mapped to any one digital output channel by configuring

the channel ID in the ALERT_PIN[3:0] register field. In autonomous mode, the device generates the start of

conversion using the internal oscillator. The first start of conversion must be provided by the host and the device

generates the subsequent start of conversions.

ADS7028 Datasheet(PDF) 21 Page - Texas Instruments

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