stusb02e STMicroelectronics, stusb02e Datasheet - Page 15

• Manufacturer Part Number: stusb02e
• Description: Usb Transceiver
• Manufacturer: STMicroelectronics

STUSB02E
Functional description
8
Functional description
The STUSB02E is designed to provide USB connectivity in mobile systems where available system
supply voltages are not able to satisfy USB requirements. The STUSB02E can operate down to supply
voltages of 1.6V. As shown in the circuit above, the STUSB02E takes advantage of the USB supply
voltage, V
, to operate the transceiver. The system voltage, V
, is used to set the reference voltage
BUS
IF
used by the digital I/O lines interfacing to the system controller. Internal circuitry provides translation
between the USB and system voltage domains. V
will typically be the main supply voltage rail for the
IF
controller.
In addition, a 3.3V, 10% termination supply voltage, V
, is provided to support speed selection. V
can
PU
PU
be disabled or enabled under software control via the CON input. This allows for software-controlled
connect or disconnect states. A 1.5KΩ resistor is required to be connected between this pin and the D+ or
D– lines to respectively specify full speed or low speed operation.
The use of ESD transient protection devices is not required for operation, but is recommended.
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