USB375x EVB - Evaluation Board User Manual
Revision 1.1 (08-29-11)
2
SMSC USB375x EVB
USER MANUAL
1 Introduction
This user manual is for the USB3750 Evaluation board. This board can be used to test and evaluate
the functionality of the USB3750 and USB3751. The USB375x EVB exposes the upstream and
downstream ports, as well as the I
2
C communication pins.
There is also SMSC software that can be used with the USB375x EVB and a Total Phase Aardvark
adaptor that can be used to communicate with the USB3750. This software can be used to evaluate
the functionality of the USB3750, prototype microprocessor software, and test how the USB3750 fits
into the entire system. The Total Phase Aardvark adaptor is not included with the USB375x EVB.
2 Hardware
The USB375x EVB is a simple board that demonstrates the capabilities of the USB3750. The board
consists of the upstream and downstream ports, a VOUT LED for visual confirmation of the switch
functionality, an I
2
C header exposing the I
2
C pins, and additional circuitry that is used for proper I
2
C
communication.
2.1
USB Ports
The USB ports are mounted on the edges of the USB375x EVB. The downstream ports use the
standard USB Type A receptacle. The label for the port is located below the receptacle. The upstream
port can be a standard USB Type B, mini-B or micro-B receptacle.
2.2
Test Points and LEDs
The USB375x EVB also breaks out the remaining pins.
TP1
connects to GND,
TP2
connects to the
VBUS pin, and
TP3
connects to the VOUT pin. The VOUT pin is also connected to
LED4
to confirm
that the OVP switch is enabled or disabled. When the LED turns on, the OVP switch is closed and
power can flow from the upstream port to VOUT.
Figure 2.1 Upstream and Downstream Ports
Upstream
Downstream1
Downstream2