Problem with initialisation of EG21-G

Technical Subjects
1

Hello everyone,
I need your help, I use a EG21-G module GSM for a project. When I try to start my module, the module reboot himself, it never finish his initialisation. I can see it in a debug terminal. In the firt time, I thought it’s my reset signal which imposes a reset on the EG21 so I shunt the reset to avoid the zero level.
Even if I did it, I continue to reset himself.
Someone have an explanation for me, or are you already have this problem with this GSM module?

Thanks for your help,

CME

2

Is the power supply to the modem adequate?

3

Hello Snowgum,
Yes I forgot to precise that I never loose my power supply on VBAT_RF and VBAT_BB. I have a very steady voltage of 3V7.

4

Someone are an other possible solution because it’s a big problem for me to continue my project and to develop the soft of the GSM management?
Thanks a lot
CME