4 ms·
the usb ports on macs are supposed to have overcurrent protection. You actually get a dialog popup in the OS when it happens. I know because I've triggered it
by nerfhammer 11y ago
the usb ports on macs are supposed to have overcurrent protection. You actually get a dialog popup in the OS when it happens.
I know because I've triggered it doing something with an arduino.
- klodolph 11y agoUSB overcurrent protection is pretty sophisticated. Devices get 100 mA for free, then have to ask the host for more current. Well, it's a bit more complex nowadays, but that's the basics.
- rcxdude 11y agoI'm not sure if there are many devices which actally follow that spec to the letter (in either direction). Usually the USB ports will just allow 500mA (or whatever they're designed to provide) plus some fairly generous overhead, regardless of what the device has asked for, and assuming they bother to implement overcurrent detection at all.
- nerfhammer 11y agoI believe macs give you 500ma for free