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Hi,
I am using CCG3PA (CYPD3171) and I got the idea that we can power the chip from both or either one of the two power supplies from the datasheet (p.6):
"CCG3PA can operate from two possible external supply sources:
VBUS_IN_DISCHARGE (3.0 V–24.5 V) or VDDD (2.7 V–5.5 V).
When powered through VBUS_IN_DISCHARGE, the internal
regulator generates VDDD of 3.3 V for chip operation."
However, on the CY4532 EVK, if I remove the jumper for VDDD (so only VBUS_IN is powering CCG3PA), the user device isn't being charged.
On the other hand, if I remove the jumper for VBUS_IN (so only VDDD is powering CCG3PA), the user device gets charged.
I also noticed the same behavior on my own design board. It seems VDDD is required, but the datasheet seems to state otherwise. Can someone clarify this point? Perhaps I need a firmware modification if I don't have VDDD powered?
Thanks,
Jonathan
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Hi Jonathan,
Are you running the power adapter firmware or powerbank firmware?
Is it default firmware or is there any modification?
For default kit firmware -
Please note that if you short VBUS_IN ans VBUS_P on J4, you cannot power the CCG3PA since VBUS_P comes from a buck-boost which has to be configured by CCG3PA itself. VBUS_P will be generated only when CCG3PA is already powered.
If you want to verify powering up CCG3PA from VBUS_IN, connect VBUS_IN to TYPE-C_VBUS (pin 2 and 3) on J4 and connect a power adapter / power source on the Type-C connector. It should get powered and charge any battery connected to the battery terminals.
Whenever the kit has a power-source by itself (like a charged battery / DC jack / power from DC terminals), it will prefer to be powered by VDDD.
Only during powerbank mode and dead battery situation, it can be powered by VBUS_IN connected to TYPE-C_VBUS.
Regards,
Rajath
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Hi Jonathan,
Are you running the power adapter firmware or powerbank firmware?
Is it default firmware or is there any modification?
For default kit firmware -
Please note that if you short VBUS_IN ans VBUS_P on J4, you cannot power the CCG3PA since VBUS_P comes from a buck-boost which has to be configured by CCG3PA itself. VBUS_P will be generated only when CCG3PA is already powered.
If you want to verify powering up CCG3PA from VBUS_IN, connect VBUS_IN to TYPE-C_VBUS (pin 2 and 3) on J4 and connect a power adapter / power source on the Type-C connector. It should get powered and charge any battery connected to the battery terminals.
Whenever the kit has a power-source by itself (like a charged battery / DC jack / power from DC terminals), it will prefer to be powered by VDDD.
Only during powerbank mode and dead battery situation, it can be powered by VBUS_IN connected to TYPE-C_VBUS.
Regards,
Rajath
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Hi Rajath,
Thanks for the info. I was running the default power adapter firmware on the CY4532 EVK. About the EVK, I see how it won't work due to the dependency that is needed on the regulator. As for our own PCB, I will update you soon on it as we were busy troubleshooting a different issue.
Thanks,
Jonathan
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Thanks Rajath. I've tested it out on the EVK.