USB3320C-EZK-TR Standard Microsystems (SMSC), USB3320C-EZK-TR Datasheet - Page 36

• Manufacturer Part Number: USB3320C-EZK-TR
• Manufacturer: Standard Microsystems (SMSC)

Specifications of USB3320C-EZK-TR

• Number Of Transceivers: 1
• Esd Protection: YeskV
• Operating Supply Voltage (typ): Not RequiredV
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (max): Not RequiredV
• Operating Supply Voltage (min): Not RequiredV
• Pin Count: 32
• Mounting: Surface Mount
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Lead Free Status / RoHS Status: Compliant

Revision 1.0 (07-14-09)
5.6.2
5.6.2.1
Note: The IdGnd switch has been provided to ground the ID pin for future applications.
VBUS Monitor and Pulsing
The USB3320 includes all of the VBUS comparators required for OTG. The VBUSVld, SessVld, and
SessEnd comparators shown in
are used to monitor changes in the VBUS voltage, and the state of each comparator can be read from
the
The VbusVld comparator is used by the Link, when configured as an A device, to ensure that the
VBUS voltage on the cable is valid. The SessVld comparator is used by the Link when configured as
both an A or B device to indicate a session is requested or valid. Finally the SessEnd comparator is
used by the B-device to indicate a USB session has ended.
Also included in the VBUS Monitor and Pulsing block are the resistors used for VBUS pulsing in SRP.
The resistors used for VBUS pulsing include a pull-down to ground and a pull-up to VDD33.
In some applications, voltages much greater than 5.5V may be present at the VBUS pin of the USB
connector. The USB3320 includes an overvoltage protection circuit that protects the VBUS pin of the
USB3320 from excessive voltages as described in
SessEnd Comparator
The SessEnd comparator is designed to trip when VBUS is less than 0.5 volts. When VBUS goes
below 0.5 volts the USB session is considered to be ended, and SessEnd will transition from 0 to 1.
The SessEnd comparator can be disabled by clearing this bit in both the
and
register will read 0. The SessEnd comparator trip points are detailed in
To USB Con.
VBUS
USB Interrupt Status
USB Interrupt Enable Falling
R
VDD33
VBUS
~ ~
~ ~
Overvoltage
Protection
VBUS
Figure 5.11 USB3320 OTG VBUS Block
register.
Figure 5.11
[UseExternalVbusindicator, IndicatorPassThru]
IndicatorComplement
registers. When disabled, the SessEnd bit in the
EXTVBUS (logic 1)
DATASHEET
36
are fully integrated into the USB3320. These comparators
ChrgVbus
DischrgVbus
SMSC PHY
Section
Highly Integrated Full Featured Hi-Speed USB 2.0 ULPI Transceiver
4.575V
0.5V
1.4V
5.6.2.6, and shown in
[0, X]
[1, 0]
[1, 1]
en
en
VbusValid Rise or
SessEnd Rise or
VbusValid Fall
RXCMD VbusValid
SessEnd Fall
Table
VbusValid
SessValid
SessEnd
USB Interrupt Enable Rising
4.7.
USB Interrupt Status
Figure
SMSC USB3320
5.11.
Datasheet