Calciphylaxis. Calciphylaxis is a condition characterised by necrosis (cellular death) of the skin and fatty tissue. It is seen mainly in patients with end stage kidney disease. It is also sometimes called calcific uraemic arteriolopathy.
Besides a data link, USB provides 5 +/- 0.25 volts to power an otherwise unpowered device or charge a battery in a self powered device. A USB controller or hub is required to power one unit load (100 mA, a low power load). It can optionally power up to 5 unit loads (500 mA, a high power load).
1: A Standard Downstream Port (SDP) USB port can charge devices with up to 500 mA of current when the computer is on (a). However, when the computer is off (b), charging over USB is not possible. Fig. 2: The Pericom PI5USBxx is a USB charging controller.. Enabling all-the-time USB charging in PCs, laptops.