EVB-USB3340 USB Transceiver Evaluation Board User Manual
Revision 1.1 (12-14-10)
6
SMSC USB3340 EVB
USER MANUAL
3 Getting Started
gives a simplified view of the USB3340 EVB. The USB3340 EVB is
ready for device operation. To modify the board for OTG or Host applications, refer to
or
, respectively.
It is required to p5V to T&MT connector pin 28 and +3.3V on T&MT pins 8,16,57,69 to power
the USB3340 EVB.
The USB3340 EVB is built with a USB Mini-AB receptacle. Do not substitute a Mini-AB receptacle
different from the one specified in the bill of materials, or a short circuit may occur on the USB signals
at the Micro-AB connector PCB footprint.
When the USB3340 EVB is powered on, check the following things to be certain the board is
functioning normally:
RESET should be de-asserted (logic low at the T&MT connector and RESETB at the USB3340
should be logic high = VDD18). If RESETB=0, the USB3340 will be in a low power state.
The voltage at R2 (RBIAS) should be 0.8V DC. If this voltage is not present, the USB3340 is in a
low power state.
There should be a digital 60 MHz square wave signal at T&MT connector pin 90. The amplitude
should be approximately VDDIO. This is the CLKOUT signal of the USB3340.
Figure 3.1 Block Diagram of USB3340 EVB
VBUS
Switch
ULPI Signals
VBUS
ID
DP
DM
J1
100-pin
T&MT
2.2uF
150uF
ONA
FAULTAn
VDD3.3
+5V
DP
DM
ID
ULPI Bus
GND
Install C20=150uF if host
operation is desired
RESETB
VDD1p8
VDD3p3
VBAT
1.0uF
1.8V
LDO
XI
EXT_VBUS_DET
USB3340
RESET
PCB can accept Micro-AB
Or Mini-AB receptacle
CPEN
XO
VDDIO
VARIABLE
VDDIO
REG
REFSEL[2:0]
USER
REFCLK
CONFIG
