Hello I am writing here since I am not receiving any answer on the private support case I opened more than a week ago (I miss very much the time when asking for support was just a matter of a phone call to the Analog FAE from our distributor...)
I am trying to figuring out why MAX17335 is waking up by itself from shipmode without any external stimulus.
The problem first appeared on the prototype of a board we are developing, fearing it was a hardware problem I purchased a MAX17335_EVKIT_A evaluation board to test it further.
The test was carried out as follows:
1) Connect a Li-Ion battery (measured voltage 3.8V) to BATTP and BATTN pads
2) Attach a oscilloscope probe between SYSP and SYSN pads
3) Connect the EVB to a Windows PC through the USB cable
4) Download and run MAX17335 program (provided by Analog Devices) and verify the communication is working (READING label on bottom right corner of the program)
5) Verify the oscilloscope is reading a positive voltage between SYSP and SYSN pads equal to battery voltage.
6) Click on "Commands" tab, press the button "Enter Shipmode" and right after press the button "Stop Communication".
7) Verify the oscilloscope is reading zero between SYSP and SYSN pads
8) Wait a while (it could be a few minutes, half a hour, a hour...) and verify on the scope that the voltage between SYSP and SYSN pads is again equal to battery voltage, confirming MAX17335 woke up from shipmode by itself.
I tested several configurations of nConfig register (0x1b0): nConfig = 0, nConfig = 0x0440 (PBEn and COMMSH), nConfig = 0x40 (COMMSH), nConfig = 0x400 (PBEn) but the result is always the same MAX17335 wakes up by itself after a random time.
Is there anybody out there experiencing the same problem?
Thank you.
