We are observing an issue with the HE910v2: our board is designed in a way so that we need the modem signal GPS_LNA_EN to be active in order to enable a external regulator to supply a GPS active antenna.
In the HE910v2 eval board we observe that as long as the GPS module is enabled [AT$GPSP=1] that signal is active. The signal goes low again when we deactivate the module [AT$GPSP=0]. All in all, the expected behaviour.
However in our board we are unable to get GPS_LNA_EN activated regardless the activation state of the GPS module [AT$GPSP=x]. We have discarded that the cause of the issue may be a hardware problem because that signal does indeed activate upon modem boot, but only for ~150ms. However, further AT$GPSP commands have no effect on the state of this signal.
Please find below the versions of the devices we are using:
(working) modem on the eval board
(non-working) modem on our board
Any hints will be appreciated!
We have a similar issue with the GE910-GNSS module.
The GNSS_LNA_EN can only be activated one time after the module power up. The GNSS_LNA_EN signal responds to the AT$GPSP=1, and AT$GPSP=0 changing the voltage level from 1.8V to 0V.
But when we try to send another AT$GPSP=1 the signal GNSS_LNA_EN does not change.
This GNSS_LNA_EN signal is used to enable an NCP612SQ30 chip which supplies the 3V to active antenna.
Due this error in the GNSS_LNA_EN signal the board can not adquire position, only the first time when the module powers up.
The firmware version is 13.00.106.
Thanks a lot,
are you using the GE910-GNSS interface or your application? In this case, can you share the schematic, please?
A ticket with your support request has been opened on TS-EMEA. Please, when reply to this message add TS-EMEA@telit.com on copy in order to have all the information in one thread only. Thank you.
I attach the schematics.
I send this schematics and also the PCB files to the Telit Design Review Service.
If you need I can send you the report from the review.
Sorry, but I don’t know how to send this mail toTS-EMEA@telit.com, I can’t see the CC field.
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