Usb External Circuit Example; Figure 15.27 Usb External Circuit In Bus-Powered Mode (When On-Chip Transceiver Is Used) - Hitachi H8S/2215 Series Hardware Manual

15.8

USB External Circuit Example

Figures 15.27 and 15.28 show the USB external circuit examples when the on-chip transceiver is
used. Figures 15.29 and 15.30 show the USB external circuit examples when an external
transceiver is used.
USB
3
*
Pxx
(P36)
VCC
*
2
Pull-up
control external
circuit for
full speed
Notes: * 1 Step-down to the operating voltage VCC(3.3V) of this LSI.
*
2
To protect the LSI, voltage applicable IC such as HD74LV-A series must be used
even when the system power is turned off.
*
3
In HD64F2215, HD6432215A, HD6432215B, and HD6432215C, Pxx should be assigned
to an output port as the D+ pull-up control pin.
In HD64F2215U, in which on-chip ROM can be programmed by using the USB, P36
should be used as the D+ pull-up control pin.
Figure 15.27 USB External Circuit in Bus-Powered Mode (When On-Chip Transceiver is
Internal transceiver
DrVCC
VCC
USD+
VBUS (3.3V)
(3.3V)
VCC
(3.3V)
*
1
Regulator
VBUS
1.5k
(5V)
USD- DrVSS
VSS
Rs Rs
D+ D-
GND
USB connector
Used)
Rev. 3.0, 10/02, page 521 of 686
0: Bus-powered mode