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USB2422/MJ Fiches technique(PDF) 15 Page - SMSC Corporation

No de pièce USB2422/MJ
Description  2-Port USB 2.0 Hi-Speed Hub Controller
PDF  51 Pages
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Fabricant  SMSC [SMSC Corporation]
Site Internet  http://www.smsc.com
Logo SMSC - SMSC Corporation

USB2422/MJ Fiches technique(HTML) 15 Page - SMSC Corporation

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2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
SMSC USB2422
15
Revision 1.0 (06-04-13)
DATASHEET
2.5.2
Internal Pull-Down (IPD)
If a strap pin’s buffer type is IPD, one of the two hardware configurations outlined in Figure 2.3 must
be implemented. Use the Strap High configuration to set the strap option value to 1 and Strap Low to
set the strap option value to 0.
Figure 2.3 IPD Pin Strap Example
2.5.3
LED
If a strap pin’s buffer type is I/O and shares functionality with an LED, the hardware configuration
outlined below must be implemented. The internal logic will drive the LED appropriately (active high or
low) depending on the sampled strap option. Use the Strap High configuration to set the strap option
value to 1 and Strap Low to set the strap option to 0.
Figure 2.4 LED Pin Strap Example
HUB
HUB
IPD Strap Pin
Strap High
R k
Ω
+V
VSS
IPD Strap Pin
Strap Low
VSS
HUB
Strap Pin
LED/
Strap High
HUB
Strap Pin
LED/
Strap Low
R
k
Ω
R
k
Ω



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