BG95-M3 doesn't respond to AT commands

[vmalumbres]

HI,

We are working with Quectel BG9dM3 module via uart by using a ti mcu (all deploy in out pcb design).

We cand handle PWRKEY, RESET and PSM_TRIGGER signals from mcu, as well uart communication.

However, module seems to not be working. It is not responding to AT commands (Tested with ATI and AT+GMR?)

In boot up, we check with oscilloscope that PWRKEY and RESET signals are 1.5V, STATUS signal is in 1V8,but PSM signal is in 0V (And trigerring in PON_TRIG is not working). Also we verified that uart signal arrives to Quectel’s module ok.

To sum up, another weird thing is that going down and up PWRKEY for turning on module (like datasheet shows) seems to turning off module. STATUS signal is 0V

[herbert.pan-Q]

This issue is very complex, I recommend that you first check that the hardware design matches the hardware reference design documentation, and then you can use the COM debugging tool and USB debugging tool to manually debug

[vmalumbres]

Hi,

We re-check datasheet v1.6. There is something weird related to PWRKEY.

For the next sequence, we reproduce the low edge of PWRKEY (we measure a 550 ms edge), however STATUS signal is not up after 2.1 seconds.

Some troubleshoot for that?

Thanks!