> > that works - somehow... i think the protection diodes can take up to 2mA so that's > basicaly no problem to connect 5V peripherals through a 1K or bigger resistor. > the problem is, that you inject current to VCC. this means it raises VCC if you don't > drain the current somewhere. and that can become a problem, especialy as the > MSP features low power modes ;-) > > so, if you drain the current, you inject over the protection diodes, you can do it. > if you don't do it, the supply voltage of the MSP can get up to 5V, beyond the > specs... (imagine the rest) > > chris >
Accidently raising the VCC can be a bit of a problem - we had one card in which the MSP took so little current (it was mostly asleep) that the 3.3V regulator couldn't cope - it went right up to 6V. The MSP430F133 worked perfectly well at 6V, so it was a while before we noticed! The solution was to put a 10k resistor between VCC and GND...
