4 ms·
Indeed, I have two of them. They don't always work correctly. Meaning they don't always charge depending on the device and cable you plug into them.
by lasereyes136 6y ago
Indeed, I have two of them. They don't always work correctly. Meaning they don't always charge depending on the device and cable you plug into them.
- SAI_Peregrinus 6y agoI've got a (USB2) power monitor that includes a chip (just an STM8L051F3 microcontroller) to manage power negotiation and keep data disconnected. So it negotiates power with host and device separately, without ever needing to connect the data lines from host to device directly. I expect there are or will be versions for USB 3.<whatever I've lost track>.
- jasomill 6y agoFor USB 2, widely-available battery packs compatible with whatever current negotiation standards your devices require work just as well, and have the added benefit of storing power. Less generally, these batteries can also break ground loops, which comes in handy when connecting a power supply to both a USB device and an attached analog audio device (e.g., iPhone and wired noise-canceling earbuds).