User guide

UC864-E/G/WD/WDU Hardware User Guide

1vv0300766a Rev.4

- 03/02/09

9. USB Port

UC864-E/G/WD/WDU includes an integrated universal serial bus (USB) transceiver,

compliant with USB 2.0 specifications and supporting the USB Full-Speed (12 Mb/s)

mode. In HSDPA (High Speed download Packet Access) mode(for UC864-E/G only),

the downlink data speed rates up to 7.2Mbps. Hence OEMs need to interface

UC864-E/G to applications in full-speed (12Mbits/s) mode.

Signal

UC864-

E/G/WD/WDU

Pad No.

Usage

USB_VBUS 48

Power supply for the internal USB transceiver. This pin is

configured as an analog input or an analog output depending

upon the type of peripheral device connected.

USB_D- 80

Minus (-) line of the differential, bi-directional USB signal to/from

the peripheral device

USB D+ 79

Plus (+) line of the differential, bi-directional USB signal to/from

the peripheral device

USB_ID

(for future use)

Analog input used to sense whether a peripheral device is

connected and if connected, to determine the peripheral type,

host or slave

NOTE:

UC864-E/G/WD/WDU does NOT support host device operation at the moment, that

is, it works as a slave device. Consequently USB_ID must be opened (not

connected).