Unused USB pins

[jpowning]

Regarding the USBn_3V3 pins, the datasheet says "Tie to VBAT_DCDC or connect to ground . If not using USB and using 1.8 V supply, USBn_3V3 can be connected to 1.8 V." This is confusing. If you are not using USBn, and it says it can be connected to ground, then why not connect it to ground (to minimize supply current)?

[ZhangJennie]

Hi jpowning 

What's the part number?

Thanks,

Jun Zhang

[jpowning]

Hi - the part I am using is LPC55S16JBD100. Thanks for your interest.

[ZhangJennie]

Hi

Please use the DS recommended design for unused USB pins. This is related with on chip HW design.

you should consider USB low power mode or disable USB domain to lower the power consumption.

Thanks,

Jun Zhang