When the BBB work on battery and come back to 5v the USB port doesn't
work !?
Le 22/10/2020 à 15:13, [email protected] a écrit :
Looking at BeagleBone Black rev C schematic and TPS65217C data sheet
If the battery is connected to the Rechargeable Battery access pins
(TP5/6/7/8 TESTPT1),
The battery feeds the USB HOST VBUS '5V' through SYS_5V, the 3V to 5V
booster would have to be an inline adapter plugged into the USB HOST
connector, this is slightly non trivial.
In theory, a booster input could be connected to SYS_5V on P9.7
(ground to P9.1) and booster output to an USB hub power input with
Wi-Fi plugged into hub, however many hubs let the 5V hub power flow
back into the host.
If a battery pack is just connected to the DC in Jack, the voltage
should be 4.3V to 5.8V.
The battery pack could be connected to a 5V booster input and the DC
jack to booster output.
On Thursday, 22 October 2020 at 12:22:03 UTC+1 [email protected]
wrote:
Many Wi-Fi modules are designed for a Lithium cell which is 3V to
4.2V.
The first thing the USB part does is reduce the USB 5V to 3.3V
You can boost the battery to 5V with something like
https://www.adafruit.com/product/1903
On Thursday, 22 October 2020 at 10:15:28 UTC+1 pfrossard wrote:
Hi,
I try to find an USB Wireless adaptors working at 5v and 3.3v
(When BBB
working on battery),
I checking a lot of key without success ...
Someone have an idea ?
Thanks.
--
-
Philippe Frossard
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