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PDF USB2524 Data sheet ( Hoja de datos )
| Número de pieza | USB2524 | |
| Descripción | USB MultiSwitch Hub | |
| Fabricantes | Microchip | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de USB2524 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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USB2524
USB MultiSwitch Hub
Highlights
• USB 2.0 Compatible 4-Port Hub with two
upstream host port connections
- Provides electronic reconfiguration and re-
assignment of any of its 4 downstream ports
to either of two upstream host ports (“on-the-
fly”)
- Allows multiple USB hosts to share peripher-
als and enables a user to dynamically assign
host ownership
- Embedded Mode - 8 (predefined, OEM
programmable) configurations for port assignment
are selectable via three external control signals
- Peripheral Mode - Dedicated select pin for every
downstream port (total of 4), selectable edge or level
triggered in order to support a wide range of possible
switch configurations and styles
- Each host has a dedicated Single Transac-
tion Translator (Single-TT) for supporting FS/
LS devices, or can also operate in Multi-TT
mode where each downstream port has a
dedicated Transaction Translator.
• Downstream ports can be disabled or defined as
non-removable
• Switching hub can be configured as compound
device for support of ‘embedded’ USB peripherals
• Multiple LED modes for maximum implementation
flexibility
- USB Mode - 2 Single-color LEDs for each
downstream port (total of 8 LEDs)
- Host Ownership Mode - 8 Single-Color LEDs
indicate which upstream host each of the
downstream ports are assigned to.
- Host Ownership & Port Speed Mode - 8 Dual-
Color LEDs are used to indicate which
upstream host each of the downstream ports
are assigned to, while simultaneously indicat-
ing downstream port connection speed.
• Enhanced configuration options available through
either a Single Serial I2C EEPROM, or SMBus
Slave Port
- VID/PID/DID
- Port Configuration
- String Descriptors (each can support a maxi-
mum length of 31 characters)
- Custom Manufacturer String
- Custom Product String
- Custom Serial String
- Assignment of downstream ports to upstream
hosts
- Switching mechanism selection
• Hardware Strapping options allow for configura-
tion without an external EEPROM or SMBus Host
- Default VID/PID/DID, allows functionality
when configuration EEPROM is absent
• Complete USB Specification 2.0 Compatibility
- Includes USB 2.0 Hi-Speed Transceivers
- High-Speed (480Mbits/s), Full-Speed
(12Mbits/s) and Low-Speed (1.5Mbits/s)
compatible
- Full power management with choice of Indi-
vidual or Ganged power control
• On-Board 24MHz Crystal Driver Circuit or 24 MHz
external clock driver
• Internal PLL for 480MHz USB 2.0 Sampling
• Internal 1.8V Linear Voltage Regulator
• Integrated USB termination and Pull-up/Pull-down
resistors
• Internal Short Circuit protection of USB differential
signal pins
• 1.8 Volt Low Power Core Operation
• 3.3 Volt I/O with 5V Input Tolerance
• 56-Pin QFN RoHS Compliant Package
2013 - 2016 Microchip Technology Inc.
DS00001588B-page 1
1 page  
USB2524
• Selection of end-user method of switching ports between hosts
- Embedded Mode: 8 default configurations that are controlled by OEM programmable registers (or Internal
default settings).
- Peripheral Mode: Each wire directly controls one of the 4 downstream ports. The interface is selectable
between edge triggered operation or level triggered operation for compatibility with many different mechanical
switch configurations or direct control from an external Microcontroller’s GPIO pins.
• Enablement of String Descriptor Support, along with the capability to customize each of the 3 different string
descriptors (up to a maximum size of 31 characters each)
• Selection of LED Mode: USB Mode, Host Ownership Mode, or Host Ownership Mode with Speed Indication.
2013 - 2016 Microchip Technology Inc.
DS00001588B-page 5
5 Page 
USB2524
TABLE 4-2:
Name
1
1
1
1
SMBUS OR EEPROM INTERFACE BEHAVIOR (CONTINUED)
Name
0
0
1
1
Name
0
1
0
1
Function
Internal Default Configuration
• PRT_ASSIGN[3:0] = Peripheral Mode (Edge Triggered)
• LED Mode = Host Ownership Mode
• Strap
• options on pins LED_A[4:1]_N are enabled.
• Supports unassigned Ports
Internal Default Configuration
• PRT_ASSIGN[3:0] = Peripheral Mode (Edge Triggered)
• LED Mode = Host Ownership & Port Speed Mode
• Strap options on pins LED_A[4:1]_N are disabled
• Supports unassigned Ports.
Reserved
Reserved
TABLE 4-3: MISCELLANEOUS PINS
Name
Crystal
Input/External
Clock Input
Symbol
XTAL1/
CLKIN
Type
ICLKx
Crystal Output
XTAL2
OCLKx
RESET Input
Self-Power /
Bus-Power
Detect
TEST Pin
RESET_N
SELF_PWR
TEST
IS
I
IPD
Function
24MHz crystal or external clock input.
This pin connects to either one terminal of the crystal or
to an external 24MHz clock when a crystal is not used.
Note: See Table 11-1 for the required logic voltage
levels of this pad if it will be driven by an exter-
nal clock source.
24MHz Crystal
This is the other terminal of the crystal, or left
unconnected when an external clock source is used to
drive XTAL1/CLKIN. It must not be used to drive any
external circuitry other than the crystal circuit.
This active low signal is used by the system to reset the
chip. The minimum active low pulse is 1us.
Detects availability of local self-power source.
Low = Self/local power source is NOT available (i.e., Hub
gets all power from Upstream USB VBus).
High = Self/local power source is available.
Used for testing the chip. User must treat as a no-
connect or connect to ground.
2013 - 2016 Microchip Technology Inc.
DS00001588B-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet USB2524.PDF ] | |
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