[SPAM bayesian] - Protecting Microcontrollers (was Re:[sdiy] converting a 10v p to p toa 0-5 volt signal) - Bayesian Filter detected spam

[Scott Nordlund]

> "All I/O pins have protection diodes to both VCC and Ground as
> indicated in Figure 21."
>
> Another example: many Xilinx FPGAs have their programming pins run
> off the 2V5 rails. But with current-limiting resistors it is
> possible to program them from 3V3 drive (ref. Xilinx app notes on
> programming Spartans).
>
> I know that our chips have ESD protection diodes on all pins, and its
> something that gets tested quite extensively.



Ok, and in this case you'd be deliberately using these built-in diodes
to implement the level shifting, with presumably no adverse effects.  Makes sense, though for stuff that is less than thoroughly documented, I might still prefer to take the paranoid approach.

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