Tool/software:
Hi,
we're currently looking into the ADS7067. In the Datasheet it's mentioned that you can reset it with a reset bit and also by switching AVDD off and on again. (Content number 6.4.1 page 25)
Meanwhile in the Absolute Maximum Ratings it says that the REF-Voltage and all Inputs shouldn't be greater then AVDD + 0.3. (Content number 5.1 page 5).
Do you really have to shut down all these pins instead of the only mentioned AVDD or is it constructed to withstand a short reset and only for a long time without AVDD the part will be damaged?
Furthermore are there any known issues that will provocate the need of a reset? Like writing registers in a special kombination or any other known circumstances?
Thanks in advance.
BR Michael
Hello Michael!
Welcome to the E2E Forum!
That is actually a very good question actually! Ideally, yes, powering everything off would be the safest approach to take, but for a power-on-reset (POR) it should be fine without since its for a short time. If the power is expected to be off for a long time I would recommend powering-off/removing the external reference as well.
Reading the BOR bit in the System_Status register afterwards to confirm it was a successful reset is also recommended initially.
Could I ask for some information on the type of system the ADS7067 is going to be used?
I would say the ADS7067 is pretty robust, and no specific issues need to be mentioned that would require a full power reset. Use case can help me confirm though.
If you are planning to enable CRC there are a couple things I would like to mention:
Best regards,
Yolanda
Hi Yolanda,
thank you very much for your quick and detailed answer.
The ADC will be used multiple times on a module for maritime purpose and should be able to run 24/7. A complete shutdown of only one or multiple ADCs for a longer time isn't a use-case.
Can you guarantee that a short violation of the maximum ratings will not damage the part? If so can you name a timespan that would be valid? I need concrete answers for my boss.
Daisy-Chain mode is currently not planned, but good to know and it makes sense, that it'll need a physical reset.
Best regards,
Michael