[E3-hacking] Another hello

[jasmine at electronpusher.org]

On Thu, 19 Jan 2006, andy at entropy.demon.co.uk wrote:

> On the E3 (home hacking) I'm scared to shove more than 3.3V in as I 
> believe the OMAP is a 3.3V part on a 0.18ish micron process. I suspect 
> it would die if connected directly to an RS232 level signal if there 
> isn't some protection.

The OMAP5910 can run on core voltages around 2v (1.45 to 2.2v according to 
who we made them for) and has 3.3v IOs.  It is on a 120nm process, and 
the UART pins have internal pad driver logic containing a hevty anti-ESD 
diode designed to protect the chip up to 2kV.  It can't cope with much 
actual power, though, so it would probably die if you fed it 9v at a 
source impedance of less than 10kohms or so.

-J.,
former OMAP architect