TPS65224-Q1: PMIC ADC function is not safety relevant

As a first step, could you please confirm you have access to the functional safety documentation already for this device? If not, please request access here:

https://www.ti.com/secureresources/TPS6522X-SAFETY-DOCUMENTS

Hi Shailendrakumar,

I wanted to understand the usage here. First, I'm assuming you already have access to our safety documents for this device, but just in case you do not please request the access here: https://www.ti.com/secureresources/TPS6522X-SAFETY-DOCUMENTS

It sounds like you are referring to the safety manual. The Safety Manual states that this device:

As a safety element out of context the device achieves ASIL-D. But as system integrator, you then have to develop the whole system in such a way for the system as a whole to meet any safety goals you have. 

Then I see your question about the ADC function specifically - the safety manual states in section 4.4 Functional Safety Constraints and Assumptions, under [SA_13] "The ADC (analog-to-digital converter) function of the TPS6522x(-Q1) is assumed to be not relevant for the functional safety of the system." The safety assumptions mean that in making the SEooC concept and doing our analyses and requirements, these were the assumptions we worked off of. So for this device, it was assumed the ADC is not safety relevant.

Are your questions coming from your system using the ADC in a safety-related context, or are you just using ADC in your system but not in safety-relevant way?

Regards,

Katie

I do have access to PMIC safety manual. It has below line.

"[SA_13] The ADC (Analog-to-Digital Converter) function of the TPS6522x(-Q1) is assumed to be not relevant for the functional safety of the system"

ADC is required for the program under development need to be safety relevant. So we have below queries in this regards.

1. Is there any future release of PMIC planned which will have ADC functionality as safety compliant? IF so, planned release date.
2. FIT rate related to PMIC ADC function is needed
3. Does PMIC have self-test for ADC function or is it planned for any upcoming update? If not present, can this be provided?

Dear Jari

I believe FIT rate is independent of whether functionality is developed as FuSa compliant or not.

I request to provide FIT rate data for this ADC functionality which is crucial data for us.

Thank you.

Best regards

Shailendra

Hi Jari

In general, an analog-to-digital converter (ADC) can perform a self-test using an internal reference to verify that it's functioning correctly.

Can we trigger this self test at least by some means? I mean not as FuSa but a generic test. Please clarify.

-Shailendra