ADS7038: Reading latest ADC values with auto sequence enabled

Kelvin Tan

Part Number: ADS7038

Hi TI Team,

One thing is not clear in the datasheet is that when auto sequence is enabled, how would the host read the latest measure of a particular channel without triggering a manual conversion?

Thanks

Kelvin

over 2 years ago

0 Tom Hendrick over 2 years ago

TI__Guru**** 182761 points

Hi Kevin,

Welcome to our e2e forum! Have you reviewed Figure 36? You need to initiate the sequence and then the selected channels are converted/output via the SDO pin. If you want to read a particular channel that is not in your sequence, or if you want to repeat sampling on a specific channel, you would have to go back into manual mode of operation.

0 Kelvin Tan over 2 years ago in reply to Tom Hendrick

Prodigy 20 points

Hi Tom, Thanks for your prompt response. In this case, it would be better to use dma to receive the data right? I am worrying if the data is out of sync, then all the measurement would be incorrect. By the way, is there a sample code that I could refer too? Thanks!

0 Tom Hendrick over 2 years ago in reply to Kelvin Tan

TI__Guru**** 182761 points

As long as your DMA can keep up with the output data, you should be fine.

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ADS7038: Reading latest ADC values with auto sequence enabled