User's Manual

SEJIN ELECTRON, INC

This Document contains proprietary to Sejin Electron, Inc. Use or disclosure without written

permission from an officer of Sejin is expressly forbidden.

Document number : R-FB-0

Page 9/13

Issued date : 2009-02-11

5.8 USB HUB

Bus powered USB 2.0 high speed USB HUB functionality

One internal USB port is used for keyboard

One USB 2.0 high speed downstream port is available for external low power USB devices

The external USB devices that attached on the downstream ports must be low power USB devices

which maximum 100mA of power current

6 Environmental Characteristic

6.1 Operational ambient temperature and humidity

Temperature : 0 ~ 40℃

Humidity: 85%RH (without condensation)

6.2 Storage ambient temperature and humidity

Temperature : -20 ~ 50℃

Humidity: 95%RH

7 Environmental Performance

7.1 Shock

There shall be no abnormally in operation and appearance of the keyboard when an impact of 10G

has been applied to the package keyboard. The testing method shall be in accordance with 213B of

MIL-STD-202E

7.2 Vibration

The keyboard shall not be damaged electrically and mechanically when the following vibration has

been applied to the packaged keyboard. The testing method shall be in accordance with 201A of MIL-

STD-202E.

Frequency: 10~55Hz

Amplitude: 0.5mm

Direction of vibration: Direction X, Y and Z individually

Time of vibration: 2 hours