RE: [E3-hacking] Another hello

On Thu, 19 Jan 2006, andy@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