stusb03e STMicroelectronics, stusb03e Datasheet - Page 15

• Manufacturer Part Number: stusb03e
• Description: Usb Transceiver
• Manufacturer: STMicroelectronics

STUSB03E
8
The STUSB03E is designed to provide USB connectivity in mobile systems where available system
supply voltages are not able to satisfy USB requirements. The STUSB03E can operate down to supply
voltages of 1.6V and still meet USB physical layer specifications. As shown in the circuit above, the
STUSB03E takes advantage of the USB supply voltage, V
voltage, V
controller. Internal circuitry provides translation between the USB and system voltage domains. V
typically be the main supply voltage rail for the controller.
In addition, a 3.3V, 10% termination supply voltage, V
be disabled or enabled under software control via the CON input. This allows for software-controlled
connect or disconnect states. A 1.5K resistor is required to be connected between this pin and the D- line
when operating in low speed mode. In full speed mode either an internal pull-up resistor or an external
one connected between V
R
The use of ESD transient protection devices is not required for operation, but is recommended.
SEL
pin to V
Functional description
IF
, is used to set the reference voltage used by the digital I/O lines interfacing to the system
IF
or GND.
PU
pin and D+ line can be used; the desired configuration is chosen by tying
PU
, is provided to support speed selection. V
BUS
, to operate the transceiver. The system
Functional description
IF
PU
will
15/20
can