Zx4120 Gps

[barkerben]

Hi,

I'm using a ZX4120 GPS module in a project. There is a pin which should, according to the data sheet, stay high unti a fix is ound, then go low.

In fact, until a fix is found the output is periodic, roughly 50% mark space high (2.7v)/low.

Once a fix is found, the voltage is still unstable, but much lower - the maximum voltage is < Logic High for the pic, so that is ok.

Has anyone else had this problem? I could put a capacitor is series with a resistor and diode across the port, then a disharge resistor in paralell. Thus the voltage would stay high, charging current would be low, and when the pin went low the capacitor would disharge and the pin go low.But it seems a bit cumbersome. Any ideas?

Cheers,

Ben