Rob Cawsey

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10 years, 3 months ago.

HDK Schematic USB Host/Device Confusion.

Hi,

electronics not being my strong point I'm a little confused which part of the Lpc1768 HDK schematic I would need to implement in order to allow a Vodafone usb dongle to be used on my prototype PCB?

Thanks Rob

2 Answers

Erik -
10 years, 3 months ago.

USB Host is the one you need. The dongle is a USB device.

Rob Cawsey
poster
10 years, 3 months ago.

Should i include 33R resistors feeding into D- & D+ or are the 15K resistors on D- & D+ sufficient?

Well I don't have experience with such things, but only the 15k ones are drawn.

posted by Erik - 12 Jan 2014

The 33R resistors and filtercapacitors (47p) are also needed. Obviously you also need gnd and 5V power for a USB host socket. Power should in fact be current limited and monitored by the host, but you can do without.

posted by Wim Huiskamp 12 Jan 2014

Just to recap from the hdk i should include circuit for a usb device minus the mosfet and include the 15K pull downs from the usb host circuit

posted by Rob Cawsey 12 Jan 2014