Datasheet

Section 14 Universal Serial Bus (USB)
Rev.7.00 Dec. 24, 2008 Page 526 of 698
REJ09B0074-0700
1: Self-powered mode
Internal transceiver
P36
1.5 kΩ
DrVCC
(3.3 V)
3.3V
VBUS
(5 V)
USD+ USD-
D+ D-
24 Ω 24 Ω
DrVSS
GND
UBPMVBUS
VCC
(3.3 V)
IRQx
VCC
VCC
VSS
USB connector
*
1
*
2
*
3
USB
To protect the LSI, voltage applicable IC such as HD74LV-A series must be used
even when the system power is turned off.
To cancel power-down mode by detecting the USB cable connection, theVBUS
signal must be connected to the IRQx pin. Note that power-down mode
state cannot be canceled by the USB interrupt EXIRQx.
Prevent the VBUS pin from being affected by noise while USB is in communication.
Pull-up control
external circuit
for full speed
1.
2.
3.
Notes:
VCC
*
1
Figure 14.27 USB External Circuit in Self-Powered Mode