Normally the FireTV Stick will consume less than 0.5A average, but the peak power consumption can be significantly higher (especially during firmware updates). Using the original cable one with equivalent wire thickness is important.
The fact that a phone only pulls 0.5A indicates that the USB-A port isn’t being detected as a Charging Downstream Port (CDP) or a Dedicated Charging Port (DCP), and therefore a compliant USB2 device is ONLY allowed to draw a max of 0.5A (a USB3 device can draw up to 0.9A if connected using a USB3 cable)
As the PPM is said to support Power Bank functionality one starts to wonder how this is implemented. At minimum CDP should be implemented or if there’s an option to disable data communications in the USB-A port then DCP can be indicated (D+ and D- shorted inside the PPM just like a regular power bank). Apple has their legacy 1A and 2.1A modes with resistors as well but DCP works with Apple devices these days as well.
Has anyone tried whether the USB-C ports can act like a power source? In that case the standard mandates a minimum of 1.5A of current to be available (which even my phone can supply without complaining).
Thanks for the detailed technical info! Learned a lot from your post.
I don’t remember which was the original cable that Amazon provided. But the same cable that I am using now for the Fire TV Stick works with my power bank and TV but not on the PicoPix Max. It just gets stuck in an infinite boot loop (booting may have higher than normal power requirements).
Yes, the video port offers a relatively small amount of power to the connected device. I have yet to confirm what kind of power. Devices say “charging” though. (Also, the projector charging port seems to identify as a serial port device…)
I will comment as soon as I have some verified info. Unfortunately without the China team we are struggling a bit to provide you clear answers. I’ve been traveling for a month now, but should be able to test this over the weekend.
The 2nd generation regular stick has a peak consumption above the usual 500mA USB current limit but typically only during firmware update, it will warn the user to use the 5V/1A adapter and USB cable shipped with the device. In the 4k case the consumption seems to be lower but the margins may be quite low.
My 2G firestick reboots regularily while browsing the main menu.
According to a cheap USB meter the current never exceeds 0.45A with normal around 0.30-0.35A.
Unless the spikes are so short the cheap meter isn’t showing them.
One of these days I’ll measure the stick current consumption at a higher sample rate and see. I’ve been told by “sources” that the current consumption is indeed highly intermittent, not enough space inside to fit enough capacitors but the shipping cable and power supply adapter combo never causes any issues.
I have a small Toshiba TV that powers the stick just fine as long as I don’t perform firmware updates, that causes the stick to restart, so it’s very much a hit or miss.
Had to go check and yes, mine is also a LiteON (LO P/N: PA-1050-9AZ2). 5.25V / 1A so they make sure to have as much voltage margin as they can get away with. I have a feeling the voltage is significantly lower out of the PPM.