Zero4U 4-Port USB Hub for Raspberry Pi Zero User Manual (revision 1.20) Copyright © 2017 UUGear s.r.o. All rights reserved.
Table of Content Product Overview ................................................................................................. 1 Package Content .................................................................................................. 3 Specifications ....................................................................................................... 4 About Powering Mode .......................................................................................... 5 Self-Power Mode ...........
Product Overview Zero4U is a 4-Port USB hub designed for Raspberry Pi Zero. It extends the only data micro USB port on Raspberry Pi Zero and gives you 4 standard USB ports, which allows you to connect more USB devices to your Raspberry Pi Zero. The board size of this USB hub is exactly the same with Raspberry Pi Zero, and can be firmly attached under Raspberry Pi Zero back-to-back.
Reversion 1 (for V1.2 and V1.3) Reversion 2 (for V1.
Package Content Each package of this USB hub contains: l 4-port USB hub board x 1 l Plastic spacer x 4 l M2.5 x 10mm screws x 4 l M2.5 nuts x 4 l Ferrite Ring x 1 (for V1.
Specifications Dimension: 65mm x 30mm x 9mm Weight 14g (net weight without any accessory) Standards Data Speed USB Ports LED Indicators Power Mode Output Voltage Output Current USB Specification Revision 2.0 and 1.1 compatibility Single Transaction Translator (STT) USB v1.1: 12 Mbps USB v2.
About Powering Mode A USB hub could be powered by the USB bus (bus-power mode), or be powered by the power supply (self-power mode). Bus-power mode is simpler as it does not need to have external power supply, but it has quite limited ability to power the devices on the USB hub. When you are trying to power more devices with higher current, it is recommended to use the self-power mode. This USB hub supports both bus-power mode and self-power mode.
Usage Guide To attach this USB hub to Raspberry Pi Zero, simply put them back-to-back together and place the plastic standoff between them, then use the plastic screws and nuts to firmly fix the 4 corners. Please make sure to attach in the correct direction, so the 4 pogo pins on the USB hub can accurately contact to the PP1, PP6, PP22 and PP23 testing pads on the back of Raspberry Pi Zero.
The picture below shows how to mount Zero4U on Raspberry Pi Zero W, with the ferrite ring between them. Remarks: this USB hub has only one transaction translator (TT) for all downstream USB ports. Please try not to connect any USB 1.1 device to the USB hub; otherwise all devices on the hub will be slowed down to the USB 1.1 speed (12 Mbps). If you only connect USB 2.0 devices to this USB hub, all of devices on the hub can work with USB 2.0 high speed (480 Mbps), if they support USB 2.0 standard.
In the picture, the power supply is connected to Raspberry Pi, and the USB hub is powered by the USB bus. This will limit the output current to 500mA for all USB ports on the hub. If you also connect an alternative power supply to the USB hub (via the white connector on board), the USB hub will work in self-power mode and it can output up to 2A current for USB ports.
Troubleshooting: USB Hub Not Recognized After you connect Zero4U to Raspberry Pi Zero, the blue LED should light up when you power your Raspberry Pi Zero. If you connect USB device to the USB port on Zero4U, the white LED should light up accordingly.
Why connecting OTG adapter will help? It is because the OTG adapter has the “ID” signal pin connected to the GND pin internally, which explicitly disables the Ethernet Gadget and lets the USB port on Raspberry Pi Zero to stay in host mode, that way Zero4U could be recognized successfully. Please notice that, shorting ID pin to ground can override the software configuration. Even if you keep the “dtoverlay=dwc2” in the /boot/config.
Revision History Revision Date 1.00 2016.04.04 Description Initial revision Update pictures for second revision of Zero4U v1.3 1.10 2017.01.23 Add troubleshooting of “hub not recognized” issue. 1.20 2017.03.21 Add description for the newly added ferrite ring.
