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USB bus power switches. USB bus power switches USB power switch

ATEN's US3342 is a device-sharing switch that allows you to connect 2 USB 3.2 Gen 2 ports to USB-C-equipped laptops and 4 more USB 3.2 Gen 2 ports peripherals For collaboration and data exchange. The US3342 switch is compatible with USB 3.2 Gen 2, supporting data transfer rates up to 10 Gbps, and is also compatible with USB 3.1 Gen 1, USB 2.0 and USB1.1.

Using the US3342 switch, you can quickly and easily switch between computers using a remote port switch whose LED indicator indicates which computer is active. USB-C PD specification power delivery is also supported for laptops with USB-C ports and under Windows control or Mac with 5V, 9V, 15V and 20V profiles.

Thanks to the exclusive feature provided by BEZEL X software, the US3342 switch allows two laptops to share files and data between two different platforms - Windows and Mac, by dragging the mouse from one screen to another. Software BEZEL X makes it easy to manage and transfer files with just one touch.

The included connection cables eliminate the additional cost of purchasing USB cables. For flexible installation, USB-C cables are included, allowing users to connect laptops with USB-C. The US3342 switch is the most cost-effective solution for laptops equipped with USB-C ports.

As a result, the US3342 switch, with its compact all-in-one design, is ideal solution for users who want to save desk space and organize their workspace efficiently.

Allows two computers equipped with USB-C ports to share four USB 3.2 Gen 2 devices with data transfer speeds of up to 10 Gbps
Supports specification USB-C Power Delivery 3.0 for up to 85W laptop charging (optional USB-C power adapter required)*
BEZEL X software - provides file transfer function and mouse control between two platforms - Windows and Mac
Supports 5V, 9V, 15V and 20V power profiles
Switch devices at the touch of a button using a remote port switch
Console LED Indicator - Lets users know which computer is active
Plug-and-play operation - no need to install drivers or connect an external power adapter
Overcurrent protection
*To charge the device, it is recommended to use a limited power adapter (LPS) that meets the USB-C PD specification with a power greater than 65W. Minimum system requirement Regarding power supply for the operation of basic USB functions and video signal output, it is at least 5 V, 3 A.

Characteristics:

Delay in appearance of moisture error during hot switching - 1 ms
Scheme smooth start avoids voltage surges
UL Lab Recognized: Ref No. 205202
Limiting the output current (no more than 1 A) allows you to protect the power source from short circuits
Thermal protection
Maximum static output current - 500 mA
Miniature SO-8 body
Input voltage range from 2.7 to 5.5 V
Open key resistance at 5 V input voltage - no more than 140 mOhm
Current consumption in standby mode - no more than 1 µA
Maximum current consumption in operating mode - 200 µA
Under Voltage Lockout (UVLO)

Application:

USB hubs for desktop and laptop PCs
USB monitor hubs
Self-powered USB hubs
Powerful USB devices that require surge current limitation
Supply voltage switches for general use

Structural scheme:

Pin locations:

General description:

LM3526 - USB bus supply voltage switch and current limiter. This dual-port device is ideal for use in laptops and laptops.

1 ms error flag setting delay avoids erroneous shutdowns during hot plug-in.

The device has two thermal protection circuits - one for each port. If one of the switches overheats, the other may continue to work.

The LM3526 has an input voltage range of 2.7 to 5.5 V, which allows it to be used as a surge current limiter for 3.3 V USB peripheral devices, as well as devices with self-powered 5.5 V power. The control inputs of the device are compatible with 3.3 V and 5.0 V logic.

The LM3526's small size, low public switch resistance, and 1 ms error flag latency make it ideal for hub and self-powered applications.

Documentation:

You can get advice and purchase components from the company’s official suppliers

The switch is powered from USB port

Advances in the design and manufacture of microcircuits not only make it possible to place a complex device on a single chip, but also lead to a significant reduction in the electrical power consumed by this device, which makes it possible to use new methods of power supply. We recently talked on the pages of our magazine about the technology of supplying power to end devices operating in 10Base-T, 100Base-TX and 1000Base-T networks directly via Ethernet cables of CAT5 category and higher, which is called PoE (Power over Ethernet). In this article we'll talk about the possibility of powering the switch from the USB port. Remember that the USB port provides external devices power supply with a voltage of 5 V and a current of up to 500 mA.

For example, let's take the miniature unmanaged switches MultiCo EW-108R and EW-105T. Both switches are based on highly integrated chips (Realtek RTL8309SB and IC+ IP175C), which are ready-made nine- and five-port switches. These switches can be powered either from external source power supply, as well as from the USB port of the nearest computer or server (the power supply and cable for connecting to the USB port are included in the delivery package).

Switches EW-108R and EW-105T are designed to operate in Ethernet networks of IEEE 802.3 (10Base-T) and IEEE 802.3u (100Base-TX) standards and have 8 and 5 RJ-45 ports, respectively. All ports support automatic MDI/MDIX polarity detection. This eliminates the need for crossover cables or uplink ports. Any port can be connected to a computer or other switch using a straight-through twisted pair cable.

Switching is carried out using Store and forward technology, which ensures packet filtering and removal of damaged ones. The switches' non-blocking & non-head-of-line blocking architecture guarantees wire-speed performance. Flow control is performed using the IEEE 802.3x protocol based on frames in full-duplex mode and backpressure in half-duplex mode. The switches have a built-in MAC address table for 2K entries and 512/768 KB (EW-105T/EW-108R) buffer memory. Auto-negotiation of 100Base-TX or 10Base-T speeds and full-duplex/half-duplex connection mode makes the switch easy to install in existing Ethernet network very simple.

Switches have a power indicator and port indicators (one for each port) to help determine connectivity and network activity. Durable metal housings guarantee good cooling and long term services. The dimensions of the case are practically determined by the dimensions of the interface connectors and are 79S62S20 (EW-105T) and 94S62S20 (EW-108R) mm. Thanks to passive cooling, the switches operate completely silently.

Compact dimensions and low power consumption open up wide possibilities for choosing the location of switches (for example, they can be hidden in a cable channel). Using the included self-adhesive magnetic rubber feet, the switch can be easily attached to any steel surface.

To check operation, a processor-based workstation was connected to each switch port Intel Pentium 4 3.0 GHz, equipped with integrated motherboard gigabit network adapter Marvel Yukon Gigabit Ethernet 10Base-T/100Base-TX /1000Base-T Adapter, which operated in 100Base-TX mode.

An operating system was installed at the workstations Windows system XP Professional SP1.

To generate network traffic over the TCP protocol and measure performance, the NetIQ Chariot 5.0 software package with the High_Performance_Throughtput.scr load file was used.

The test was performed with a gradual increase in the load on the switch. At the first stage, transmission was switched on between the first and second stations, then between the second and third, and so on, until the transfer was switched on between the last (fifth or eighth) and first stations. As a result, at the last stage, all stations and, accordingly, all ports of the switch operated in duplex mode. The test results (Figures 1 and 2) show that the switches can easily handle the load. Running the test at various organizations power supply (from an external power supply or from a USB port) did not reveal any differences in the operation of the switches.