A unit load is defined as 100 mA in USB 1.x and 2.0, and 150 mA in USB 3.0. A device may draw a maximum of five unit loads from a port in USB 1.x and 2.0 (500 mA), or six unit loads in USB 3.0 (900 mA). There are two types of devices: low-power and high-power. A low-power device (such as a USB HID) draws at most one-unit load, with minimum operating voltage of 4.4 V in USB 2.0, and 4 V in USB 3.0. A high-power device draws, at most, the maximum number of unit loads the standard permits. Every device functions initially as low-power (including high-power functions during their low-power enumeration phases), but may request high-power, and get it if available on the providing bus.
A unit load is defined as 100 mA in USB 1.x and 2.0 , and 150 mA in USB 3.0 . A device may draw a maximum of five unit loads from a port in USB 1.x and 2.0 ( 500 mA ) , or six unit loads in USB 3.0 ( 900 mA ) . There are two types of devices : low - power and high - power . A low - power device ( such as a USB HID ) draws at most one - unit load , with minimum operating voltage of 4.4 V in USB 2.0 , and 4 V in USB 3.0 . A high - power device draws , at most , the maximum number of unit loads the standard permits . Every device functions initially as low - power ( including high - power functions during their low - power enumeration phases ) , but may request high - power , and get it if available on the providing bus .
How much is a unit load in USB 3.0?
How much is a unit load in USB 3.0 ?
150 mA
150 mA