USB connector use safety precautions

Most electronic devices today have USB connectors that enable them to exchange data or charge the batteries of portable devices via USB. Although USB, a communication protocol, has become quite popular, there are some safety precautions that must be observed when the target application requires powering a device via a USB connection. Electrical Characteristics and Protective Measures:Downstream systems connected via USB can be powered by a variety of types of hosts. When connecting a standard USB source device, such as a personal computer (PC), the connector will contain Vbus power and data terminals (D+ and D-).The Vbus voltage value is defined by the USB specification: rated at 5V and higher up to 5.25V.In fact, longer cables will ring due to the inductance of the series. This larger ringing ripple voltage depends on the input capacitance and parasitic inductance of the mobile device. Aftermarket non-original parts tend to have lower performance and cables can have higher parasitic parameters, which can be potentially harmful to connected peripherals. Typically the Vbus pin is connected to the power input pin of the transceiver (sometimes via a low dropout regulator with a larger voltage rating of 6V), or to the input pin of a charger when the Vbus power supply is used for charging lithium-ion batteries (which in most cases are rated at a larger voltage of 7V or 10V). However, the user can also connect a peripheral to charge the built-in Li-Ion battery and then use a commercially available wall adapter. In this case, only the Vbus pin and GND are connected, while D+ and D- are shorted.

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