At the Intel Developer Forum Organization USB-IF showed symmetrical connectors that will be used in the standard USB 3.1, and this week it was announced the completion of the specifications extensions USB Power Delivery v2.0 and Billboard Device Class v1.0.
The original version of the USB standard has the capability to transfer data and only 0.75 watts of power (150 mA at 5 V), in version 2.0 the maximum power increased to 2.5 W by increasing the current up to 500 mA, 3.0 allowable amperage was raised to 900 mA, capacity, respectively, increased to 4.5 watts. In addition, there was a separate standard for chargers capable of transmitting 7.5 watts of power without the possibility of data exchange.
Standard Power Delivery v2.0 increase the power to 100 watts. Of course, such a jump is required not only to increase the current strength, but also voltage: USB 3.1, these characteristics up to 5 A and 20 B, respectively. Furthermore, Power Delivery v2.0 no fixed direction power transmission, which allows, for example, to use the notebook same USB port for feeding or charging the peripheral devices of the computer (but not simultaneously). Connected devices will be able to negotiate on the distribution of power.
One of the key innovations of the standard Power Delivery v2.0 will be alternative modes beyond the specifications of USB-IF, and determined by the equipment manufacturers. In particular, it will be possible to reassign the conclusions on the USB-port of type C, and use them for any other purposes.
USB connector type C
Billboard Device Class v1.0 defines the methods that are used to connect devices, translated into an alternative operation mode , with the host system. If the device fails to switch to an alternative regime, its work will be limited opportunities for USB 2.0-powered line VBUS. Related Products :
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