SEJIN ELECTRON, INC SPECIFICATIONS for SEJIN USB Keyboard with articulation V1.0 Model Name P/N USER P / N TYPE Description Specification No Issued Mechanical checking SKS-4210UH R-FB-0 Electrical checking Approved SEJIN confidential - Copyright© Sejin electron, Inc. 2009. This Document contains proprietary to Sejin Electron, Inc. Use or disclosure without written permission from an officer of Sejin is expressly forbidden.
SEJIN ELECTRON, INC Contents 1 2 3 4 5 6 7 Revision History ............................................................................................................... 4 Scope................................................................................................................................. 4 Features............................................................................................................................. 4 Mechanical Specifications ...................................
SEJIN ELECTRON, INC 8 9 10 Keyboard Layout ............................................................................................................ 11 Block Diagram................................................................................................................ 12 Information to the user.................................................................................................... 13 SEJIN confidential - Copyright© Sejin electron, Inc. 2009.
SEJIN ELECTRON, INC 1 Revision History Rev. No Ver 1.0 2 Issued date & Descriptions Initially released Date 2009-02-11 Issued by S. R, Hong Checked by Scope This document describes a specification for “Key-Obeation” USB Keyboard 3 Features ● Low profile Ergonomic Keyboard with articulation ● High-Speed USB2.
SEJIN ELECTRON, INC The force/displacement curve should not exhibit any significant step or plateau from P2 to the end of full travel. Linear measures are in mm and the values represent the force and displacement of a key switch after it has been preloaded by 10 to 20 grams. Standard: a. Non-lock rubber tactile feeling b. P0 (Preloaded Point) Travel = 0 mm / Force = 10 +10/-5 grams c. P1 (Break over Point) Travel = 0.8 ± 0.3 mm / Force = 45 ± 15 grams d. P2 (Make Point) Travel = 1.75 ± 0.
SEJIN ELECTRON, INC 4.3 Operating Region Top end 0.8mm Total traval 2.5mm OFF region 1.2mm ON/OFF Swithing region 0.5mm ON region Bottom end 4.4 Key-top Deflection Key-top deflection to on side shall be 0.8mm or less. 4.5 Operating feeling No definite stickiness or other abnormality shall be allowed when force is applied with a finger to Keytop center at the rate of 3 times a second. 4.6 Key-top Height Variation The key top height variation must not greater than 0.
SEJIN ELECTRON, INC 4.8 Key-top Alignment The key top alignments will not exceed 0.5mm when top measured between the center to center of keys next to each other. The measurement will be performed with keys in the home positions. 0.5 mm Max 4.9 Rotational Alignment The maximum rotation of key shall be less than 0.5mm as shown below. A<0.5mm (1X1.75 Unit key Max) 0.7mm(1X2 Unit key Max) 4.
SEJIN ELECTRON, INC 5 Electrical Specification 5.1 Power supply voltage DC 5.0V 5.2 Power supply current consumption Max 500mA 5.3 Insulation resistance More than 100M ohm at 250V DC 5.4 Chattering and bounce Operation force shall be applied according to the normal operating method at 5V DC, 5mA.There shall be no bounce and chattering within 10msec when it is measured using a specially prepared tester or a synchroscope.
SEJIN ELECTRON, INC 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 : Humidity: 6.
SEJIN ELECTRON, INC 7.3 Heat Cycle Test Check Method: By the condition shown in the figure below, repeat heat cycle test for 2 times. 50 Standard: When the test is finished, followings must be satisfied. a. All functions operate normally. b. There are no defects which harm commercial value, e.g., change of color, rust or change of form. 7.4 Key life Test Standard: a. key-switch life: 2,000,000 cycles b.
SEJIN ELECTRON, INC 8 Keyboard Layout SEJIN confidential - Copyright© Sejin electron, Inc. 2009. This Document contains proprietary to Sejin Electron, Inc. Use or disclosure without written permission from an officer of Sejin is expressly forbidden.
SEJIN ELECTRON, INC 9 Block Diagram SEJIN confidential - Copyright© Sejin electron, Inc. 2009. This Document contains proprietary to Sejin Electron, Inc. Use or disclosure without written permission from an officer of Sejin is expressly forbidden.
SEJIN ELECTRON, INC 10 Information to the user Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
