USB3500 datasheet(28/46 Pages) SMSC

28 / 46 page

Hi-Speed USB Host, Device or OTG PHY With UTMI+ Interface

Datasheet

Revision 1.0 (04-04-05)

SMSC USB3500

DATASHEET

6.7

USB On-The-Go (OTG) Module

The USB3500 provides support for USB OTG. This mode allows the USB3500 to be dynamically

configured as a host or a device depending on the type of cable inserted into the Mini-AB connector.

When the Mini-A plug of a cable is inserted into the Mini-AB connector the USB device becomes the

A-device. When a Mini-B plug is inserted the device becomes the B-device. The OTG A-device

behaves similar to a Host while the B-device behaves similar to a peripheral. The differences are

covered in the OTG supplement.

The OTG Module meets all the requirements in the “On-The-Go Supplement to the USB2.0

Specification”. In applications where only Host or Device is required, the OTG Module is unused.

The OTG Module can be broken into 4 main blocks; ID Detection, VBUS Control, Driving External

VBUS, and External VBUS Detection. Each of these blocks is covered in the sections below.

Figure 6.8 USB3500 On-the-Go Module

OTG Module

VBUS

VDD33

VBUSVLD

SESSVLD

SESSEND

IDPULLUP

DISCHRGVBUS

ID_DIG

CHRGVBUS

0.5V

1.4V

4.575V

0.6V

USB3500 Datasheet(PDF) 28 Page - SMSC Corporation