Datasheet

Hi-Speed USB Host, Device or OTG PHY with ULPI Low Pin Interface

Datasheet

Revision 1.1 (01-24-13) 44 SMSC USB3300

DATASHEET

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.

6.5.1 ID Detection

The USB3300 provides an ID pin to determine the type of USB cable connected. When the Mini-A

Plug of a USB cable is inserted into the Mini-AB connector, the ID pin is shorted to ground. When the

Mini-B Plug is inserted into the Mini-AB connector, the ID pin is allowed to float.

The USB3300 provides an integrated pull-up resistor and a comparator to detect if the ID pin is floating

or grounded. An integrated pull-up resistor is provided to pull the ID pin high to VDD3.3 when a Mini-

B plug is inserted and the cable is floating. When a Mini-A plug is connected, the pull-up resistor will

Figure 6.10 USB3300 On-the-Go Module

Table 6.9 IdGnd vs. USB Cable Type

USB PLUG OTG ROLE ID VOLTAGE IDGND

AHOST0 0

B PERIPHERAL 3.3 1

EXTVBUS

CPEN

R=75K

R>=656 R>=281

OTG Module

VBUS

VDD33

RXCMD VbusValid

IndicatorComplement

[UseExternalVbusindicator, IndicatorPassThru]

[0, X]

VbusValid

SessValid

SessEnd

IdPullup

DischrgVbus

DrvVbus

DrvVbusExternal

IdGnd

ChrgVbus

0.5V

1.4V

4.575V

0.6V

R=100K

[1, 0]

[1, 1]

R>1M