Se Jin Electron SKS-4210UH USB Keyboard User Manual

Se Jin Electron Inc USB Keyboard

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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 1/13 Issued date : 2009-02-11

SPECIFICATIONS

for

SEJIN USB Keyboard with articulation

V1.0

Model Name SKS-4210UH

P / N

USER P / N

TYPE

Description

Specification No R-FB-0

Issued Mechanical

checking

Electrical

checking

Approved

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 2/13 Issued date : 2009-02-11

Contents

1 Revision History...............................................................................................................4

2 Scope................................................................................................................................. 4

3 Features.............................................................................................................................4

4 Mechanical Specifications................................................................................................4

4.1 General ......................................................................................................................................... 4

4.2 Key switch Operation................................................................................................................... 4

4.3 Operating Region ......................................................................................................................... 6

4.4 Key-top Deflection....................................................................................................................... 6

4.5 Operating feeling.......................................................................................................................... 6

4.6 Key-top Height Variation............................................................................................................. 6

4.7 Tilt................................................................................................................................................ 6

4.8 Key-top Alignment....................................................................................................................... 7

4.9 Rotational Alignment ................................................................................................................... 7

4.10 End stroke strength....................................................................................................................... 7

4.11 Key-top pull out force .................................................................................................................. 7

4.12 Information for serial number on the back label .......................................................................... 7

5 Electrical Specification..................................................................................................... 8

5.1 Power supply voltage ...................................................................................................................8

5.2 Power supply current consumption.............................................................................................. 8

5.3 Insulation resistance..................................................................................................................... 8

5.4 Chattering and bounce.................................................................................................................. 8

5.5 Cable length ................................................................................................................................. 8

5.6 Contact terminating assignment. .................................................................................................. 8

5.7 USB Soft Ware I/F....................................................................................................................... 8

5.8 USB HUB..................................................................................................................................... 9

6 Environmental Characteristic ...........................................................................................9

6.1 Operational ambient temperature and humidity ........................................................................... 9

6.2 Storage ambient temperature and humidity.................................................................................. 9

7 Environmental Performance.............................................................................................9

7.1 Shock............................................................................................................................................ 9

7.2 Vibration ...................................................................................................................................... 9

7.3 Heat Cycle Test.......................................................................................................................... 10

7.4 Key life Test............................................................................................................................... 10

7.5 Low Temperature Test ............................................................................................................... 10

7.6 High Temperature Test............................................................................................................... 10

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 3/13 Issued date : 2009-02-11

8 Keyboard Layout ............................................................................................................11

9 Block Diagram................................................................................................................12

10 Information to the user....................................................................................................13

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 4/13 Issued date : 2009-02-11

1 Revision History

Rev. No Issued date & Descriptions Date Issued by Checked by

Ver 1.0 Initially released 2009-02-11 S. R, Hong

2 Scope

This document describes a specification for “Key-Obeation” USB Keyboard

3 Features

● Low profile Ergonomic Keyboard with articulation

● High-Speed USB2.0

● Scissor – Switch technology

● Functionality: Microsoft Windows Vista & MAC OS

● Quite tactile feel

● Nun-skid rubber feet

● Built-in a USB port on right side of the keyboard for plugging in your mouse and

Other USB devices

● Pseudo N- key roll over

4 Mechanical Specifications

4.1 General

Keyswitch type Membrane & rubber contact with Quiet tactile feel

Number of keys 90 keys

Keyswitch life 2,000,000 cycles

Key travel (Full stroke) 2.5±0.5 mm

Operating force 45±15gf

Dimension 345.2 x 129.1 x 25.5 mm (13.5 x 5.0 x 1.0 in)

4.2 Key switch Operation

Key switch operating parameters should comply with those listed below.

Figure on the below represents typical pressure force and displacement values acceptable to SEJIN.

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 5/13 Issued date : 2009-02-11

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 ± 0.95 mm / Force = P1 - Delta

Delta = 45% to 60% of the P1 force, but 20 grams minimum.

e. P3 (Normally End Point)

Travel = 2.5 ± 0.5 mm / Force = P1 + 10 to 15 grams

Check Point: a. Operating feeling: No definite stickiness or other abnormality shall be allowed. When

force is applied with a finger on the key-top center at the rate of three times a second.

b. Key-top pulling strength: A key-top should come off after applying a force of 0.5Kg to

8Kg range in the vertical direction.

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 6/13 Issued date : 2009-02-11

4.3 Operating Region

ON/OFF

Swithing

region

0.5mm

1.2mm

0.8mm

Total

traval

2.5mm

Bottom end

Top end

ON region

OFF region

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 Key-

top center at the rate of 3 times a second.

4.6 Key-top Height Variation

The key top height variation must not greater than 0.5mm when measured between the center to

center of keys next to each other. The measurement will be performed with keys in the home positions.

0.5mm Max

4.7 Tilt

The keys must not exhibit tilt greater than 0.5mm.for the 1x1 key top, 0.6mm for the 1x1.25 key top

and 0.7mm for the 1x1.5 key

A<0.5mm (1x1, 0.75(FUN) key)

< 0.6mm (1x1.25, 1.5 key)

<0.7mm (1x1.75, 4.25 key)

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 7/13 Issued date : 2009-02-11

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.

<0.5mm (1X1.75 Unit key Max)

0.7mm(1X2 Unit key Max)

4.10 End stroke strength

End stroke should withstand a static load of 500gf applied on the tip of the key stem in the

perpendicular direction for 1minute.

4.11 Key-top pull out force

The Key-top pull out force shall be 0.5kg or more at normal temperature during initial state. The Key-

top shall be not pull out by an ordinary typing operation.

4.12 Information for serial number on the back label

0 C A C 0 0 0 0 0 3

Serial No.

Production line(A=A line, B=B line, C=C line)

Product revision number(A~Z)

Produced Month (A~Z)(A=Jan, B=Feb, C=Mar, D=Apr, E=May, F=June,

G=July, H=Aug, I=Sept, J=Oct, K=Nov, L=Dec)

Last Digit of Year(7=2007, 8=2008, 9=2009)

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 8/13 Issued date : 2009-02-11

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.

※ Chattering and bounce are defined in the following diagram :

A:Chattering

B: Bounce

5.5 Cable length

1.6m (Straight)

5.6 Contact terminating assignment.

Contact Number Signal Name

1 VBUS

2 D-

3 D+

4 GND

Shell Shield

5.7 USB Soft Ware I/F

Compliant with USB Serial Bus Specification 2.0

High speed USB standard for USB HUB

Low speed USB standard for keyboard interface (Revision 1.1 September 23, 1998)

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

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 10/13 Issued date : 2009-02-11

7.3 Heat Cycle Test

Check Method: By the condition shown in the figure below, repeat heat cycle test for 2 times.

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. Keyboard is qualified using Hasco pneumatic life tester using soft cushion actuator with

a 4cycles / second actuation speed 120 ~ 150gf air pressure.

7.5 Low Temperature Test

Check Method: Leave for 96 hours under –20℃.

Standard: The keyboard operates normally after the test.

7.6 High Temperature Test

Check Method: Leave for 96hours under +50℃.

Standard: The keyboard operates normally after the test.

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 11/13 Issued date : 2009-02-11

8 Keyboard Layout

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 12/13 Issued date : 2009-02-11

9 Block Diagram

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 13/13 Issued date : 2009-02-11

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. However, there is no

guarantee that interference will not occur in a particular installation. If this

equipment does cause harmful interference to radio or television reception, which

can be determined by turning the equipment off and on, the user is encouraged to

try to correct the interference by one or more of the following measures:

- Reorient or relocate the receiving antenna.

- Increase the separation between the equipment and receiver.

- Connect the equipment into an outlet on a circuit different from that to which the

receiver is connected.

- Consult the dealer or an experienced radio/TV technician for help.

Modifications not expressly approved by the manufacturer could void the user's

authority to operated the equipment under FCC rules.

-----The end of specification-----

Se Jin Electron SKS-4210UH USB Keyboard User Manual

Se Jin Electron Inc USB Keyboard

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