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Mathieu L.

Expert 1630 points

Hi,

on the schematic of dev kit - tm4c123 .

I would like to know why the VBUS is connected to the Pin PB1?

over 10 years ago

0 Amit Ashara over 10 years ago

TI__Guru**** 244400 points

Hello Mathieu,

Note that the R29 and R25 are not populated on the EK-TM4C123. The PB1 is the VBUS and PB0 is ID pin. The VBUS pin is used to sample the VBUS voltage for the USBOTG when working in OTG mode. More description in USB Specification for OTG... Or some wikipedia...

Regards
Amit

0 Mathieu L. over 10 years ago in reply to Amit Ashara

Expert 1630 points

Therefore, to use a bulk device mode, I only need the differential pair of the USB connector?

0 Amit Ashara over 10 years ago in reply to Mathieu L.

TI__Guru**** 244400 points

Hello Mathieu

You need only the DP DM pair of lines connected to the TM4C device and ensure that the settings indicate a force of USB Device Mode in TM4C so that it does not attempt HNP

Regards
Amit

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