UM0284
Hardware description
1 Hardware
description
The demo board contains the STUSB03E USB Low/Full Speed transceiver, one power
supply connector, one Mini-B USB connector, a connector for interfacing with the controller
and all required discrete components (pull-up resistors, serial resistors and power supply
capacitors). The device can also be configured using a set of jumpers and the main signals
can be accessed through test points (see
).
Figure 1.
STUSB03E demo board block diagram
The 'USB controller header connector' makes it possible to connect a USB controller or any
digital control system. For more information concerning the connection of the USB
controller, refer to
The jumpers also enable testing and measurement of the STUSB03E without a USB
controller.
1.1 Power
requirements
The following supply voltages for the STUSB03E USB FS transceiver are recommended:
V
IF
= 1.6 - 3.6 (typical V
IF
value is 1.8V)
V
BUS
= 4.0 - 5.5V (typical V
BUS
value is 5V)
The demo board is designed for the same voltage ranges. The board does not contain a
voltage regulator.
Jumper J3 is used to choose whether to supply the V
BUS
pin from the USB connector or
from CN1.
When the V
BUS
voltage is above V
BUSDET
threshold, LED D1 switches ON. Connect Jumper
J9 to enable this function.
STUSB03E
USB FS
Transceiver
Power pins (V
BUS
, V
IF
)
USB
Controller
Header
Connector
Mini-B
connector
Jumpers
SPD, CON, SUS,
OE#, VBUS, RSEL
R
PULL-UP
V
BUS
, DP, DM
