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Part Number: LM3550
This is the schematic
Can you provide the I2C sequence of commands you have used to this point?
Which charge voltage target are you looking to use?
The schematic looks ok from a first pass look. Can you attach a snippet of the layout? I am curious to see how close C50, C48, C49 and C51 are to the part.
In reply to Greg Lubarsky:
Thank you sooo much~
In reply to user4290762:
The registers act normal, whatever you write into , you can read the values back. it seems like the charge pump is not working at all. By the way , have you found any issues in my schematic and layout ? and i hope I can get a demo board of LM3550
I looked at your schematic and it looks to be correct. I opened up the layout files and tried to look at the layout. I am not as familiar with the allegro viewer. Are the flying capacitors connected to the C1 and C2 cap nodes on the other side of the PCB from where the IC is? It is very odd that you don't see any action on the VOUT node. When you enable the device in charging mode, can you monitor the input current? Were you able to look at the input voltage node when you enable the device? If the I2C is working, the part should show signs of trying to switch. Scope photos in general would be very helpful.
To confirm, did you try the following
One other thing to try would be to remove the supercap off of VOUT and see if the part starts up.
I can work to get an EVM put together. These boards are hand assembled so it will take a little time to get ready. To my knowledge, there is not a GUI available at this time so any I2C control would need to be generated through an outside source.
I monitored the voltages of input node/ flying capacity / output node / fet-con with the OSC. It all shows 0V during the register configuration(reg 0x10 val 0x00-->0x12).
I am looking forwared to the working demo board you send to us and I can send my issue board to you as well, Does that helps?
That is very odd. I have a board being built and hope to have it shipped out by the end of the week, so hopefully this will help you debug your system. I will close out this e2e for now. Thanks.
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