topic Re: K21 Tamper question from AN4733 in Kinetis Microcontrollers

K21 Tamper question from AN4733

PHXFAE — Fri, 05 Jun 2015 23:52:33 GMT

Looking at AN4733 figure 1, it looks like the Tamper inputs are in the VBAT power domain but I don’t see a path to clear the key. It doesn’t look like the tamper
pins can erase the key. Are these pins only useful if main power is on?

Re: K21 Tamper question from AN4733

Kan_Li — Fri, 12 Jun 2015 03:19:27 GMT

Hi Alex,

I am checking with the DryIce expert, and will let you known when I have any more information.

Thanks for your patience!

Have a great day,
Kan

Re: K21 Tamper question from AN4733

Kan_Li — Mon, 15 Jun 2015 02:20:27 GMT

Hi Alex,

I just got the feedback, the expert told me there is some issue for Figure 1, which is not complete/accurate, but she assured me that the tamper inputs are connected to the key erase logic.

Hope that helps,

Have a great day,
Kan

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