USB2514B-AEZG Standard Microsystems (SMSC), USB2514B-AEZG Datasheet - Page 56

• Manufacturer Part Number: USB2514B-AEZG
• Description: USB CHIP
• Manufacturer: Standard Microsystems (SMSC)

Specifications of USB2514B-AEZG

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Revision 1.1 (04-26-10)
8.6.2
8.6.3
Strap Pin (IPD)
Internal Pull-Down (IPD)
If a pin's strap function is enabled thru hub configuration selection,
Selection) and the strap pins driver type is IPD/O (internal pull-down for the Input function), use this
type of strap option.
The following figure shows an example of Strap High and Strap Low. Use the Strap High configuration
to set the strap option value to a ‘1’. Use the Strap Low configuration to set the strap option value to 0.
LED Strap Option
If a pin’s strap function of the LED pins are enabled thru the internal default configuration, the driver
type of each strap pin is I/O (no internal pull-up or pull-down for the input function). When the strap
pin shares functionality with an LED, use this type of strap option.
The internal logic will drive the LED appropriately (active high or low) depending on the sampled strap
option.
to set the strap option value to a ‘1’. Use the Strap Low configuration to set the strap option value to ‘0’.
Strap Pin
HUB
HUB
Figure 8.5
Strap Pin
HUB
VSS
Figure 8.4 Pin Strap Option with IPD Pin Example
shows an example of Strap High and Strap Low. Use the Strap High configuration
Figure 8.3 Non-Removable Pin Strap Example
+V
+V
kΩ
R
Figure 8.5 LED Pin Strap Example
R kΩ
R kΩ
Primary Function/
Primary Function/
Strap High
Strap High
Strap High
LED/
DATASHEET
56
Strap Pin (IPD)
Strap Pin
HUB
Strap Pin
HUB
HUB
VSS
(Table 8.1
USB 2.0 Hi-Speed Hub Controller
kΩ
R
GND
R kΩ
Hub Configuration
Primary Function/
Primary Function/
Strap Low
SMSC USB251x
Strap Low
Strap Low
LED/
Datasheet