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Tool/software:
I have a design with a TPS25750 and the BQ25792. The board successfully negotiates a voltage when a USB source is plugged in and uses it to charge the batteries. However, it fails to enter OTG mode when the source is unplugged. If I plug in a USB load which tries to negotiate a voltage higher than 5V , the TPS25750 sends an infinite loop of messages (reproduced in table 1) to the BQ25792. There is some slow activity on the SW pins but not proper switching operation.
The messages occur in a loop of this order, but the choice of 1st message is arbitrary.
Reg | Val | Reg | Val | Reg | Val | Reg | Val | |||
0x10 | 0x80 | 0x16 | 0xc0 | 0x14 | 0x1c | 0x10 | 0x80 | |||
0x14 | 0x1c | 0x01 | 0x0690 | 0x0d | 0x4b | 0x14 | 0x1c | |||
0x11 | 0x00 | 0x03 | 0x0064 | 0x0b | 0x026c | 0x11 | 0x00 | |||
0x12 | 0x00 | 0x12 | 0x40 | 0x12 | 0x00 | |||||
0x08 | 0x08 | 0x08 | 0x08 | |||||||
0x09 | 0x01 | 0x09 | 0x01 | |||||||
0x01 | 0x0690 | 0x01 | 0x0690 | |||||||
0x03 | 0x0064 | 0x03 | 0x0064 |
Thank you
Hi William,
I recall that was some issue with the first version of the TPS25750 firmware. I have moved this thread to the team that supports the TPS part.
Regards,
Jeff
Hi William,
Thank you for reaching out!
We recommend using our follow-on device, the TPS25751 for new designs. There are a couple of know issues found in the TPS25750 that are addressed in the TPS25751 specifically with the PD + battery charger pairing. Please see the following FAQ.
Best Regards,
Aya Khedr
Hi Aya, thanks for the quick response. Is there any workaround for these issues? The TPS25751D is out of stock everywhere I've checked, and I would like to avoid having to redesign to use the TPS25751S as this for a senior design project due in a month.
Hi William,
Could you please share the json file and schematics? I can take a look to see if there are any workarounds.
Best Regards,
Aya Khedr
Hi Aya,
I've attached the schematics and configuration json. Thanks for taking a look.
{"questionnaire":{"version":"7.0.4.7","answers":[0,2,2,1,0,null,1,null,1,null,0,16.8,1,0.04,0.32],"options":{},"configID":"0000","vendorID":"0000"}}
Hi William,
Thanks for providing. I will look into this and get back to you with some feedback tomorrow.
Best Regards,
Aya Khedr
Hi William,
One suggestion I have would be to change the power path for PDO1 to PP3 (PPHV) instead of PP1 (PP5V).
Please let me know if you see improvement in behavior.
Best Regards,
Aya Khedr
William,
I sent you a friendship request. Please accept this so that we can send a private message. Can help get you TPS25751D material.
Hi William,
I will close this thread as the conversation has continued elsewhere. Feel free to open a new thread for further questions.
Best Regards,
Aya Khedr
Thanks Adam and Aya for the help and offer, and apologies for my late response. I ended up going with a redesign using the S model since there were other board improvements - and the university paid for expedited shipping ;)