Actual voltages, amperage
#2
Great to see some more real-world data being collected! Smile

I decided to be nasty to mine, and plug in a 1TB external hardrive that is USB powered. When doing something like a 

Code:
find /media/usbhdd -mindepth 2 -type f

across it, to make sure it was being kept busy, I got surges of up to 500ma on the USB port, and a voltage sag of down to around v4.69 (and I'm wondering if the PMA chip is actually clamping down there as I've seen mention of that on another board with the same chip). When the drive is spinning but not active, with a load of about 220ma, I get a more reasonable v4.97. When the hdd shut down, it presented a 149ma load, and the voltage was 5.02v. 
This is with an input voltage of 5.25v (and up to 5A available) into the pine64 via the microUSB, with the USB ports reporting 5.14v with nothing plugged into them (except the meter). A keyboard/mouse receiver presented as a mere 21ma load, and the voltage stayed at 5.12v. 
Pete
  Reply


Messages In This Thread
Actual voltages, amperage - by NexusDude - 06-17-2016, 03:12 PM
RE: Actual voltages, amperage - by pfeerick - 06-18-2016, 03:47 AM
RE: Actual voltages, amperage - by pfeerick - 06-18-2016, 07:06 PM
RE: Actual voltages, amperage - by g_t_j - 06-19-2016, 03:56 AM
RE: Actual voltages, amperage - by NexusDude - 06-18-2016, 07:32 PM
RE: Actual voltages, amperage - by StefanB - 10-15-2016, 02:21 PM
RE: Actual voltages, amperage - by pfeerick - 06-18-2016, 09:10 PM
RE: Actual voltages, amperage - by g_t_j - 06-19-2016, 04:45 AM
RE: Actual voltages, amperage - by xalius - 06-19-2016, 06:10 AM
RE: Actual voltages, amperage - by janeku - 06-27-2016, 11:07 PM

Forum Jump:


Users browsing this thread: 2 Guest(s)