ADS8860: Reasons for ADC reading completely 0

he dajiang

Part Number: ADS8860

Hi,

I use ADS8860 in my PCB. Most of time the reading is as OK as expected.

However, occasionally the two-bytes result is completely 0; and once it occurs, it remains 0 forever until I reset the whole PCB.

Can anyone enlighten me what could be the causes for this issue?

Many Thanks

over 2 years ago

0 Ryan Andrews over 2 years ago

TI__Guru 69006 points

Hello,

Thank you for your post. It sounds like perhaps the device is getting stuck due to a momentary low supply voltage condition. Is it possible to power cycle only the ADS8860?

Regards,

Ryan

0 he dajiang over 2 years ago in reply to Ryan Andrews

Prodigy 196 points

Hi Ryan

Thx for your reply. I have a pin to enable/disable the power supply of PCB's analog part.

I will add code to toggle that pin and see if it helps.

0 he dajiang over 2 years ago in reply to Ryan Andrews

Prodigy 196 points

Hi Ryan,

Sorry to trouble you again.

Now I have another strange issue: the ADC reading is capped at 1.65, half of the max 3.3v.

It happens when I switch my firmware compilation mode from max -g3 to minimal -g1.

I use scope to monitor the CONVST signal. I am sure the ADC is given enough time to convert, a few microsecond, much bigger than what is stated in the data sheet.

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ADS8860: Reasons for ADC reading completely 0