Part Number: MSP430F5249
Hi,
I have a problem with the MSP430F5249IRGCT microcontroller. I have tried changing it to MSP430F5247 and the problem stills.
I have the problem with the P1.7 GPIO (Pin 25).
It has a pull-up of 10K to 3.3V, and a serial 1K resistor to a switch, that it can be opened, or closed to ground. The GPIO has a 100nF capacitor and a 5V varistor to ground.
The rest of the GPIOs work fine in the micro.
The problem is that if I touch the micro with the finger, the GPIO P1.7 goes to 0V although the switch is opened. If I touch it with an isolated material, there is no problem, so I think that there are not mechanical or soldering problems.
Adding a FW filter, I get to avoid the instantaneous problem, but if I touch the microswitch the finger for around 5 seconds, the problem appear again.
Any idea?
Thanks,
Best regards.
Aitor.