USB3300 datasheet(36/53 Pages) MICROCHIP

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USB3300

DS00001783B-page 36

 2014-2015 Microchip Technology Inc.

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 be overpowered and the ID pin will be brought to

ground. To save current when a Mini-A Plug is inserted, the ID pull-up resistor can be disabled by clearing the IdPullUp

FIGURE 6-10:

USB3300 ON-THE-GO MODULE

TABLE 6-9:

IDGND VS. USB CABLE TYPE

USB Plug

OTG Role

ID Voltage

IDGND

AHOST

PERIPHERAL

3.3

EXTVBUS

CPEN

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

[1, 0]

[1, 1]

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