EHS6 Not coming up on new hardware | Telit Cinterion IoT Developer Community
March 14, 2017 - 11:59pm, 2423 views
I just finished a design with the ELS31-V and it is working fine, no issues at all, so I need to switch to the EHS6. The board is the same as the ELS31 except the larger module footprint. Keeping in mind that Ithe ELS31 module works just fine, three modules in a row are not coming up. What I see is the V1.80 and the VCore are not powering up, but the VDDLP comes up to 1.80V just fine. The Auto-On is strapped to ground and the On signal is pulled to ground through a 10K, as the datasheet recommends. The Emergency Reset pulses low and then high to start the module up once VBatt is stable. There are plenty of bypass cap's as the design documents recommend.
Any direction is welcome.
Thank you,
Allan
Hello,
Have you made sure that the corresponding lines are located in the same place for both modules (except bigger footprint)?
Have you seen the reference design for EHS6 - https://iot-developer.thalesgroup.com/documentation/example-schematic-eh...
Regards,
Bartłomiej
What we found was the power supply was still ramping up (due to the large capacitors on the VBatt) but we had already sent an Emergency Reset, so it was missing the necessary start-up signals. Once we paused to let the power supply stabilize, then applied a reset the module came up as necessary.
Thank you,
Allan
Thank you for the information. Maybe it will be helpful for somebody with the similar problem.
Best regards,
Bartłomiej