Raspberry Pi - 4 USB Hub & RTC - Lite Board

  
 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

 

Download       User manual

 

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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