Experimentalist
Well-known member
Hi
I am looking to power these displays along with the Teensy 3.1 direct from USB without external power:
5 inch - ER-TFTM050-3
7 inch - ER-TFTM070-5
The 5" display is rated at 3.3V 450ma and the 7" is rated at either 3.3V 480ma or 5V 300ma.
As far as I am aware a USB port is capable of providing 500ma in 100ma increments. I think I read somewhere that you have to request power from the USB hub via commands to get more then the initial 100ma.
I am aware that the Teensy 3.1 can only supply 3.3V at 100ma max so I will need to add another regulator for the 5" display. I was going to use the "LM1117 3.3V 1A Voltage Regulator LDO SOT-223" see attachment for details.
Does anyone have any experience with this? I have no idea on how I would go about instructing the hub to provide more power and would also guess that not all hubs are created equal and capable of providing this amount of power. I would be grateful of any guidance anyone can offer.
Anybody?
Ex
I am looking to power these displays along with the Teensy 3.1 direct from USB without external power:
5 inch - ER-TFTM050-3
7 inch - ER-TFTM070-5
The 5" display is rated at 3.3V 450ma and the 7" is rated at either 3.3V 480ma or 5V 300ma.
As far as I am aware a USB port is capable of providing 500ma in 100ma increments. I think I read somewhere that you have to request power from the USB hub via commands to get more then the initial 100ma.
I am aware that the Teensy 3.1 can only supply 3.3V at 100ma max so I will need to add another regulator for the 5" display. I was going to use the "LM1117 3.3V 1A Voltage Regulator LDO SOT-223" see attachment for details.
Does anyone have any experience with this? I have no idea on how I would go about instructing the hub to provide more power and would also guess that not all hubs are created equal and capable of providing this amount of power. I would be grateful of any guidance anyone can offer.
Anybody?
Ex