4 ms·
This is pretty useful information to me, but I was actually commenting that even ordinary fast charging of devices on usb hubs at the same time as data seems t
by ajb 4y ago
This is pretty useful information to me, but I was actually commenting that even ordinary fast charging of devices on usb hubs at the same time as data seems to be pretty rare. The only one we found that could do it was a startech HB30C5A2CSC.
- SAI_Peregrinus 4y agoWhat's "ordinary fast charging"? USB-PD 3 or USB-PD 2 or the older Qualcomm QuickCharge? Because the older Qualcomm versions (very common, pre-dates USB-PD 3) uses the data lines to communicate and thus requires a multiplexer to disable the normal data connection for it to work. USB PD 2 works similarly to Qualcomm. There are a lot of "USB-C" devices (including hubs) that only actually use USB 2.0 signalling, and don't support USB-PD 3.
- ajb 4y agoSorry, wasn't being clear. I just mean the USB standard maximum before PD, 1.5A at 5V Most hubs only support 500mA at max on a data port.
- SAI_Peregrinus 4y agoThat'd be USB BC 1.2 spec. The phrase to look for there is "CDP" or "Charging Downstream Port". There are quite a few options for this, though most hubs with USB-A ports do only provide Standard Downstream Ports (500mA max) and often there are only one or two CDPs on the hub (with the rest SDPs).