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Raspberry
Pi
- 4 USB Hub & RTC - Lite Board
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Why Raspberry Pi
suggest you need use External USB Hub with power
Adapter?
because they
design use 140mA fuse in each USB port, "140mA",
but USB spec need
500mA for each port,
that's why lots
people have power issue for USB port.
in Rs-pi V2 they
remove the Fuse design, and yo don't have any
protect from Rs-Pi USB port.
What
you can do
?
1. modify
Rs-pi Fuse power circuit.
2. Use
external USB Hub with power adapater
Our RS-Pi
internal USB hub with 1.5A polyswitch fuse and use
USB signal (D+, D-) from
Rs-pi only, not use power
from USB port and use Raspberry
Pi 5V from P1 pin2 , so if you have good quality "more than 1.2A" DC 5V adapter , then you can use
our Rs-Pi USB hub no
problem.
if your device
need more power, we also can provide extra 5V
input(J13 mini USB B).
The Rs-Pi V1
board if you not modify the fuse circuit, you may
need plug in extra Dc 5V from
(J13 mini USB B), for the Rs-Pi V2
no need for this input.
Raspberry Pi
- 4 USB Hub & I2C - Lite Board 
i2c detect status 68 -> RTC DS1307
1. U8 RTC DS1307 with CR1220 Battery
2
U2 - USB 4 Ports HUB chipset
J1 (JP3) USB HUB USB HUB
upper port signal
input from Rs-Pi
3. J13 Mini USB 5V input for USB HUB, you don't
need plug 5V , the HUB already use 5V from Raspberry Pi,
if your USB device need more power, then you can
plug-in 5V in this port.
4. J11 for RS-Pi V2 GPIO connector (got 4 more
GPIO pin)
Adafruit
Occidentalis v0.2
image support the RTC DS1307
Can plug-in our Rs-Pi RS232 console cable with this USB HUB
board
USB Hub LED
-- 4 USB device plug-in four Ports
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package Content
1x Rs-Pi 4 USB HUB & RTC board
1x
USB to MINI USB hub input cable
1x CR1220 3V Battery
1x Manual |
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