Data Sheet
5 Board operation
The factory setting includes Mendel Linux
fl
ashed on the eMMC memory
.
It includes all the software you need to run
TensorFlow Lite models on the Edge TPU
.
To set up your board
,
see Get started with the Dev Board Mini
.
5.1 Power supply
The board requires a DC power supply that can provide 2 A at 5 V
.
5.1.1 Power from the USB ports
You can power the board by connecting a DC power supply to either of the two USB
-
C ports
.
Each USB line includes an
ideal diode to set a max current of 2 A
,
allowing up to 10 W of power from a single input
.
You may connect a separate
power supply to each port
,
providing a maximum of 20 W for the board
.
Beware that the board behaves di
ff
erently depending on which port you use to supply power
:
● USB power port:
If you connect power here only
,
you must
fi
rmly press the power button to boot
-
up the board
.
Once the board is booted
,
you can press the power button to safely shut it down
(
equivalent to
sudo shutdown
).
● USB OTG port:
If you connect power here
(
alone or in addition to the power port
),
the board boots up immediately
and operates in
"
always on
"
mode
.
That is
,
you cannot completely shut down the board when the OTG port is
connected to power
.
If you shut down the operating system or press the power button
,
it will reboot
.
To completely power
-
o
ff
the board
,
you must deliver power with the power port only
,
and then press the power button or
run
sudo shutdown now
.
When the board
'
s LED turns o
ff
,
you can disconnect the power
.
5.1.2 Power from the GPIO header
You can power the board by connecting a DC power supply to the 5 V pins on the GPIO header
.
5.1.3 Power for add-on boards
When powering the board from one USB port
,
the 5 V pins on the GPIO header can deliver up to 6 W
(
1
.
2 A
)
for accessories
such as add
-
on boards
(
Raspberry Pi HATs
).
The 3
.
3 V pins can deliver up to 330 mW
(
100 mA
).
Dev Board Mini datasheet v1
.
1
G650
-
03324
-
01
Caution:
If your power supply cannot deliver 2 A
,
the board will probably operate normally while the Edge TPU is idle
,
but it could then drop the Edge TPU interface and crash your program when executing an ML model
.
Tip:
If you want to run the board for an extended period of time in
"
always on
"
mode
(
powered via USB OTG
),
you can
later shut down the board safely if you connect a second power source to the power port
,
then unplug the OTG port
,
and
then press the power button
.
Caution:
Do not unplug the board while it is running
.
Doing so could corrupt the system image
.
Warning:
Do not use the 5 V pins as a power input for the board if you also connect either USB port to a power supply
.
If
you do
,
current will
fl
ow between the two sources
,
which degrades the USB power supply
'
s ability to power the board
,
and can cause damage to the power supply at the 5 V pin
,
potentially causing
fi
re and serious injury
.
Coral
.
ai
|
Copyright 2020 Google LLC
.
13