SH7727 Datasheet, PDF (756/1109 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7700 Series

Section 22 USB Pin Multiplex Controller
22.3 Examples of External Circuit
22.3.1 Example of the Connection between USB Function Controller and Transceiver
Figures 22.2 to 22.5 show example connections of USB function controller and transceiver.
Figures 22.2 and 22.3 show connections when using the built-in USB transceiver. Figures 22.4
and 22.5 show connections when not using the built-in USB transceiver. When using the USB
function controller, the signals must be input to the cable connection monitor pin UJBF_VBUS.
The USBF_VBUS pin is multiplexed with the USB1_ovr_current pin, and writing 1 to bit 0 of the
EXPFC register selects the USBF_VBUS pin functions. According to the status of the
USBF_VBUS pin, the USB function controller recognizes whether the cable is
connected/disconnected. Also, pin D+ must be pulled up in order to notify the USB host/hub that
the connection is established. The sample circuits in figures 22.2 to 22.5 use the USB1_pwr_en
pin for pull-up control.
SH7727
USB1_pwr_en
USB function
USBF_VBUS
USB1P
USB1M
USB1d_SPEED
USB1d_TXENL
USB1d_TXDPLS
USB1d_TXSEO
USB1d_RCV
USB1d_DPLS
USB1d_DMNS
USB1d_SUSPEND
3.3V
IC allowing voltage
application when
system power is off
IC2
1.5kΩ
IC1
USB connector
IC allowing voltage
application when
system power is off
27Ω
5V
VBUS
D+
D−
27Ω
GND
Figure 22.2 Example 1 of Transceiver Connection for USB function Controller
(On-chip transceiver is used)
Rev. 5.00 Dec 12, 2005 page 684 of 1034
REJ09B0254-0500