[tpm2] Re: Infineon SLB 9670 lifetime

[Florian.Schreiner at infineon.com]

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Hello Tom,

thanks for your interest and to bring up the topics. I would like to provide some additional information on that.
The document you mention is a datasheet, which only contains basic information. Some sections in particular to the integrated firmware is not included in the datasheet, because it is described in the full Databook document. You can get the databook via your distributor, who will grant you access on an Infineon portal for the distribution of such documents. There you will find also more recent documents from 2019.


1.1   Power management

In chapter 4.3 of the document you can find another sleep mode, which is activated when CS# pin is inactive. This is an explicit power-down or standby mode that can be activated by the user. The very low current consumption shows, that in this mode almost everything inside the TPM is deactivated to reduce the power consumption to a very low value.



4.2   Functional Operational Range

The SLB 9670 is the consumer variant of TPM, so therefore the lifetime is similar to consumer devices, which also have a much more limited lifetime (e.g. PC, workstation, tablet). There are other TPM variants for industrial -  SLM 9670 - and for automotive - SLI 9670 -. The industrial SLM 9670 has a lifetime for 20 years, see https://www.infineon.com/cms/de/product/security-smart-card-solutions/optiga-embedded-security-solutions/optiga-tpm/slm-9670/ The datasheet is in the top right corner.

I hope this helps to clarify these topics.

Best regards,
Florian


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