Telit GPS GM862 only works for like 2 seconds on start up.

GPS/GNSS Development Boards
1

whenever i turn the chip on it only works for like 3 seconds, where i can send it AT commands… Then it doesn’t respond to anything.

Same thing happens when I turn it off.

2

I realized I did an AT#SHDN command and i think that messed things up.

It apparently detached the “network” or something… How to I

reattach?

3

You need to switch it back on by taking the ON/OFF pin low for a sec or 2, it should then take a couple of seconds to register to your mobile network, you’ll see the status LED flashing like once every 3 seconds once it is connected. Also your power supply needs to be able to supply enough power during this connection/attaching stage, otherwise it’ll just go dead again.

HTH

4

I don’t think that’s the problem, because I have tried resetting it several times with the power button (i have the telit development board that sparkfun makes).

It flashes green when I turn it on… I can’t remember if it remains flashing every three seconds… I will check when I get home, but i definitely have enough power to it.

Like i mentioned, i have control of it for about 5 seconds, then I loose it… And the problem is not power, and I have tried manually resetting the unit with the power button several several times…

Thank you for the hlep

5

Have you got a 100 uF tantalum capacitor on the power input. close to the device?

Leon

6

http://www.sparkfun.com/commerce/produc … cts_id=280

That is what I have. I’m sure the sparkfun guys put one there right?

7

Can noone suggest something>?

8

Now I can’t gain any access to enter AT commands…

Everything should be working… If i remember correctly, I tried to execute a python script and that didn’t work, so I had to force a hard shutdown when it seemed to have frozen up while trying to execute my python script.

Please, guys, this is such an important project and I have a deadline soon. Could you guys help me out? Could I have a defective chip?

9

I also realized that some time (could have been immediately before it stopped working) my computer might have told me something like my drivers were going to sleep or something?

10

N/M