User`s guide

T-MOPSlcdSA User's Guide
USB Interface 26
26
13. USB Interface
The T-MOPSlcdSA is equipped with a USB controller integrated in the STPC ATLAS chipset. It comes
with two USB ports, which follow the OHCI 1.0 specification and are USB-1.1 compliant.
You can expand the amount of USB connections by adding external hubs. You can connect up to
127 USB peripherals to each hub. When using USB hubs on these interfaces they have to be self-
powered.
13.1 Connector
The USB ports are available through the J1 and the J2 connectors (each 4 pins). To find the
location of these connectors on the T-MOPSlcdSA board, please see the chapter “Connector
Locations”.
To have the signals available on the standard USB interface connectors, an adapter cable is
required. For adapter cable information see the section “Connector Functions and Interface
Cables”.
Pin-out table:
Header Pin Signal Name Function
1 VCC (*) +5V
2 USB0 USB-
3 USB1 USB+
4 GND Ground
Notes:
(*) To protect the external power lines of peripheral devices, make sure that:
-- the wires have the right diameter to withstand the maximum available current
-- the enclosure of the peripheral device fulfils the fire-protecting requirements of IEC/EN
60950.
The power contacts for USB devices on Pin 1 and Pin 4 are not protected. They are suitable to
supply connected USB devices with a maximum of 500mA power dissipation. Do not supply
external USB devices with higher power dissipation through these pins. Always use a fuse for
power on external USB connectors, as a defective USB device may damage the T-MOPSlcdSA.
Kontron recommends using a resetable fuse, which follows the USB 1.1 specification, for power
on external USB connectors.