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PDF USB2422 Data sheet ( Hoja de datos )
| Número de pieza | USB2422 | |
| Descripción | 2-Port USB 2.0 Hi-Speed Hub Controller | |
| Fabricantes | Microchip | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de USB2422 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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USB2422
2-Port USB 2.0 Hi-Speed Hub Controller
General Description
The Microchip USB2422 hub is a low-power, single
transaction translator, hub controller IC with two down-
stream ports for embedded USB solutions. The hub
controller can attach to an upstream port as a Hi-Speed
and Full-Speed hub or as a Full-Speed only hub. The
hub supports Low-Speed, Full-Speed, and Hi-Speed
(when configured as a Hi-Speed hub) downstream
devices on the enabled downstream ports.
All required resistors on the USB ports are integrated
into the hub. This includes all series termination resis-
tors on D+ and D- pins and all required pull-down and
pull-up resistors on D+ and D- pins. The over-current
sense inputs for the downstream facing ports have
internal pull-up resistors.
Features
• Supports the USB Battery Charging Specification,
Revision 1.1
• Fully integrated USB termination and pull-up/pull-
down resistors
• Supports a single external 3.3 V supply source;
internal regulators provide 1.2 V internal core volt-
age
• On-chip driver for 24 MHz crystal resonator or
external 24 MHz clock input
• ESD protection up to 6 kV on all USB pins
• Supports self-powered operation
• The hub contains a built-in default configuration;
no external configuration options or components
are required
• Downstream ports as non-removable ports
• Downstream port power control and over-current
detection on an individual or ganged basis
• Supports compound devices on a port-by-port
basis
• 24-pin SQFN (4x4 mm), RoHS-compliant pack-
age
• Commercial temperature range support:
0ºC to +70ºC
• Industrial temperature range support:
-40ºC to +85ºC
Highlights
• High performance, low-power, small footprint hub
controller IC with two downstream ports
• Fully compliant with the USB 2.0 Specification
• Optimized for minimal bill-of-materials and low-
cost designs
Applications
• LCD monitors and TVs
• Multi-function USB peripherals
• PC motherboards
• Set-top boxes, DVD players, DVR/PVR
• Printers and scanners
• PC media drive bay
• Portable hub boxes
• Mobile PC docking
• Embedded systems
• Gaming consoles
• Cable/DSL modems
• HDD enclosures
• KVM switches
• Server front panels
• Point-of-Sale (POS) systems
• IP telephony
• Automobile/home audio systems
• Thin client terminals
2013 - 2015 Microchip Technology Inc.
DS00001726B-page 1
1 page  
USB2422
Within this manual, the following abbreviations and symbols are used to improve readability.
Example
Description
BIT
FIELD.BIT
x…y
BITS[m:n]
PIN
zzzzb
0xzzz
zzh
rsvd
code
Multi Word Name
Section Name
x
<Parameter>
{,Parameter}
[Parameter]
Name of a single bit within a field
Name of a single bit (BIT) in FIELD
Range from x to y, inclusive
Groups of bits from m to n, inclusive
Pin Name
Binary number (value zzzz)
Hexadecimal number (value zzz)
Hexadecimal number (value zz)
Reserved memory location. Must write 0, read value indeterminate
Instruction code, or API function or parameter
Used for multiple words that are considered a single unit, such as:
Resource Allocate message, or Connection Label, or Decrement Stack Pointer
instruction.
Section or Document name.
Don’t care
<> indicate a Parameter is optional or is only used under some
conditions
Braces indicate Parameter(s) that repeat one or more times.
Brackets indicate a nested Parameter. This Parameter is not real and
actually decodes into one or more real parameters.
2013 - 2015 Microchip Technology Inc.
DS00001726B-page 5
5 Page 
USB2422
2.5.1 NON-REMOVABLE
If a strap pin’s buffer type is I/O, an external pull-up or pull-down must be implemented as shown in Figure 2-2. Use
Strap High to set the strap option to 1 and Strap Low to set the strap option to 0. When implementing the Strap Low
option, no additional components are needed (i.e., the internal pull-down provides the resistor).
FIGURE 2-2:
NON-REMOVABLE PIN STRAP EXAMPLE
I/O Strap Pin
HUB
+V
R kΩ
Strap High
I/O Strap Pin
HUB
Strap Low
R kΩ
GND
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
IPD Strap Pin
HUB
VSS
+V
R kΩ
Strap High IPD Strap Pin
HUB
VSS
Strap Low
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
R LED/
kΩ Strap High
Strap Pin
HUB
Strap Pin
HUB
R
kΩ
LED/
Strap Low
2013 - 2015 Microchip Technology Inc.
DS00001726B-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet USB2422.PDF ] | |
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