I have a problem connecting module Q2686 via usb. I am trying to make to work “Q2686H-431 6.63F I311” module. I am not using a development kit. Circuitry USB connection is made from the manual “Sierra Wireless AirPrime Q2686 Customer Design Guidelines Rev003” p.55.
Starting the device is as follows:
- plug the external power supply 3.6V
- switch Power ON
- wait 5 sec and connect usb cable…
and nothing happened …device is not detected OS (Windows XP). also detection usb devices were performed using ‘USB Device Viewer’ program.
VPAD-USB signal (3.3) exist at 52 pin (Q2686 module), but at 54 (USB-DP) and 56(USB-DM) pins always in logical zero. after switching (power on) the current consumption is changing, it is evident that the device works.
I do not know which way to dig
Thanks in advance for your help