Datasheet

Section 14 Universal Serial Bus (USB)
Rev.7.00 Dec. 24, 2008 Page 525 of 698
REJ09B0074-0700
14.7 USB External Circuit Example
Figures 14.26 and 14.27 show the USB external circuit examples of this LIS.
Regulator
0: Bus-powered mode
Internal transceiver
VCC
1.5 kΩ
DrVCC
(3.3 V)
VCC
(3.3 V)
VBUS
(5 V)
USD+ USD-
D+ D-
DrVSS
GND
UBPMVBUS
VCC
(3.3 V)
24 Ω 24 Ω
VSS
USB connector
*
1
USB
Step-down to the operating voltage VCC (3.3 V) of this LSI.
To protect the LSI, voltage applicable IC such as HD74LV-A series must be used
even when the system power is turned off.
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:
*
2
*
3
P36
Figure 14.26 USB External Circuit in Bus-Powered Mode