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H8S/2218 数据表(PDF) 573 Page - Renesas Technology Corp

部件名 H8S/2218
功能描述  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  750 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8S/2218 数据表(HTML) 573 Page - Renesas Technology Corp

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Section 14 Universal Serial Bus (USB)
Rev.6.00 Jun. 03, 2008 Page 525 of 698
REJ09B0074-0600
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 k
Ω
DrVCC
(3.3 V)
VCC
(3.3 V)
VBUS
(5 V)
USD+
USD-
D+
D-
DrVSS
GND
UBPM
VBUS
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



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