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Section 20 USB Function Module
Rev. 4.00 Sep. 14, 2005 Page 787 of 982
REJ09B0023-0400
USB module
General output port, etc.
IC that allows
voltage application
when the system (LSI)
power is off.
IC that allows
voltage application
when the system (LSI)
power is off.
This LSI
USB
connector
USB
cable
VBUS
VBUS
GND
D+
D+
D-
D-
5 V
Note: Operation cannot be guaranteed by this example.
When the system requires countermeasures against external surge
or ESD noise, use the protection diode or noise canceller.
3.3 V
Figure 20.17 Example of USB Function Module External Circuitry
(For On-Chip Transceiver)