For the first time boot up , I propose to use the USB0 port + DFU mode , please help double confirm whether attached boot config is correct ?
BR Jingcheng
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For the first time boot up , I propose to use the USB0 port + DFU mode , please help double confirm whether attached boot config is correct ?
BR Jingcheng
Hello Jingcheng
Thank you for the query.
Please share the schematics in searchable PDF.
Regards,
Sreenivasa
Hello Jingcheng
Please include the USB connector information to understand the source of the USB Vbus supply.
Regards,
Sreenivasa
Hello Jingcheng
For the first time boot up, I propose to use the USB0 port + DFU mode, please help double confirm whether attached boot config is correct?
Also please confirm the core supply used.
Please refer to the AM62x TRM USB boor mode details pn the core voltage requirements,
Regards,
Sreenivasa
Hello Jingcheng
Thank you.
I will review the schematics and provide my inputs.
Regards,
Sreenivasa
Hello Jingcheng
Based on the schematics you provided i put together couple of Q&A and TI suggestions
Can the supply be permanently connected to the AM62x VBUS configured in device mode – No
Can a 3.3V supply be applied directly to the VBUS – switched or permanent – No.
Recommendation
A 5V supply from the host (switched) connected through the USB connector (or equivalent) has to be connected to the device through the voltage divider as per the datasheet recommendations.
We do not define VBUS thresholds. VBUS thresholds are defined in the USB specification. The thresholds were designed to be compliant to the USB specifications and validated via USB-IF compliance tests.
The VBUS input has an ESD clamp to the 3.3V rail. The USB VBUS Design Guidelines section of the datasheet defines the VBUS connection topology. This voltage divider / clamp circuit allows VBUS to go up to 30V without harming the VBUS input. The Zener diode could be removed and a 20 kohm resistor could be substituted for the 16.5 kohm and 3.5 kohm resistors if your system will never apply a VBUS potential greater than 5.5V.
Regards,
Sreenivasa
Hello Jingcheng
Thank you for the inputs.
Have a good day.
Regards,
Sreenivasa