Keypad Specifications
CDT Custom Keypad Specifications…
Keypad Metal Domes
- 1 million operations
- Sizes available from stock are 6mm, 8mm, 12mm, 20mm, Rectangular dome available 25.4mm x 12.7mm
- Normal size is 12mm for maximum reliability etc.– embossed area can be much larger to give impression of larger button
- Minimal tactile feel for 6mm
- Spacing depends on structure. 2mm minimum but it does depend on embossing etc.
- Actuation Force = 170 to 397g
- Key Travel = 0.6 to 1.5m
Keypad Mylar Domes
- 1 million operations
- Sizes possible are 6mm to 12mm
- Recommend minimum is 8mm to give tactile feel
- Spacing depends on structure. 2mm minimum but it does depend on embossing etc
- Actuation force 150g +/- 30g for 8mm diameter key
- Key Travel is dependent on embossing height
Keypad Flat Type
- 5 Million operations
- Best for high temperature operations
- Key travel 0.1 to 0.5mm
- size range 7mm to 12mm
Kaypad Temperature Range
- Metal dome – Operating Temp range – 20C to +55C
- Mylar dome – Operating Temp range – 20C to +55C
- Flat Mylar – Temp range – 40C to +80C
Keypad Embossing
- Types of embossing: Dome, Pillow, Frame
- Cannot do sharp corners – min radii 0.5mm
- Min. 4.0mm between embossed keys
- The minimum diameter for metal dome is 5mm and 0.3 to 0.4 mm height
- The minimum diameter for Mylar dome is 6.5mm and 0.5 mm height
Keypad Graphic Layer
- AUTOTEX – is a textured polyester film made by Autotype -Available in two textured finishes, Velvet and Fine ( F150 is the standard on most keypads) and also a UV version
- Windowtex can be applied to produce clear transparent windows – not UV stable
- AUTOFLEX EBG180 – is a gloss polyester film – not highly UV stable. It has a hard coat finish to withstand scratch and chemicals
- Matt lacquer can be applied to produce a selective textured finish on gloss keypad
Keypad LED’s
- Operational temperature – 28c to +80c
- Standard Colours – red, green, orange. Other colours to order e.g. white, blue but these are more expensive
- Bi colours, red/green and red/yellow
- ‘Ultra Bright’ LEDs are used as standard – spec sheet available
- LEDs are mounted behind an embossed window. This window is normally clear but can be colour tinted to order.
- The LED Window can be supplied as flat but this is achieved by making the keypad thicker. It also changes the feel of the keys.
Keypad Window
- Choice of hardcoat, antiglare, diffused – Please Note coatings are not UV stable –see UV section.
- Can reinforce with clear rigid plastic ( 0.5mm, 1mm, 2mm etc )
- Reinforcing will need spacer dots to separate the layers
Keypad Waterproofing
- IP67 is the max achievable
- Achieved by a 5mm complete unbroken gasket around edge
- IP67 = total protection against dust and temporary immersion in water
Keypad Design Guidelines
- Printing – thinnest line poss to print is 0.15mm
- 4mm between key embossed areas
- 5mm between key and cut out
- 3mm from edge of keypad to window
- 5mm from edge of keypad to a cut out
- SMD LEDs – allow 3.5mm diameter embossing for single colour and 4mm diameter for Bi-colour
- Overall keypad size – allow 0.20mm clearance each side in recess
- 3.25mm between the edge of LED window and the edge of the frame embossed key
- 5mm gap needed between circuit and edge of keypad
- 5mm additional edge clearance needed for IP65.
- The largest possible size keypad – 500mm x 500mm
- Bending of keypad – no, flat only
- The smallest radius that the tail can be bent is 1mm but try to keep a gentle curve
Keypad Connector / tail
- Female connector – Crimpflex 2.54mm pitch, 1mm pin size. Industry standard. Spec sheet available on request
- Male pins available
- ZIF connector – various pitches available
- Polarisation is possible – Add extra pin out and get insert from Nicomatic. Part No. PHK-101
- Locking female housings can be supplied. Spec sheet available on request. Minimum order quantity applies
- Average resistance of one track in a tail with 1mm track width, 250mm long, together with connectors = 25ohms.
- The smallest bend radius for the tail is 1mm
- We supply mylar protection on all tails to protect from chafing in case of vibration inside enclosures
- Crimpflex OF series Housing Features:-
Suitable for use with 0.635mm pin headers
Stackable edge to edge
2.54mm pitch
No polarisation/locking
2-25 Ways (26-51 on request)
Single row
Mates with 12-17-NI-XX-1 pin header
Keypad Adhesives
- 3M adhesive – type 200 MP
- Becomes known as 467 / 468 when supplied with backing paper.
- 468 is thicker depth than 467, and is suitable for rougher surface finishes, otherwise the same
- Chemical resistance spec sheets available
- 200MP adhesive is NOT suitable for polypropylene
- use 300MP for polypropylene
Keypad Shielding
- To protect from RFI and also static electricity
- Can be done with either full or a grid pattern printed layer
- Window can also be shielded with ITO (Indium Tin Oxide)
- Printed on backside of top layer
- One pin needed to take to earth – can be extra track in tail or separate connector.
Keypad EL Backlighting
- EL (electro luminescence) is available
- Single layer of material under top surface
- .3mm to .5mm thick
- Colours – green blue white orange yellow. (Colours vary in brightness, please ask)
- Temp –25C to +60C (operational)
- Life 5000 to 10000 hrs continual
- 110 volts / 400HZ to operate
- Use inverter to drive (e.g. RS 267-8863). Inverters are not supplied with keypads
Keypad UV Materials
- Can use Autotex UV polyester, slightly yellow in colour and only available in textured finish not gloss
- A UV resistant gloss lacquer is available – mainly for selective texturing
- Standard hardcoat is not UV stable for extended exposure
File Formats
- CDR 11 (Preferred)
- AI
- EPS
- JPEG
Keypad Colour Options
- We can use all colours from the Pantone Matching System, Coated (C) and Uncoated (U). Coated has a brighter appearance is the standard for keypads.
- Because of material textures and tolerances in colour tones it is very difficult to match keypad colours to enclosures and we would suggest that a contrasting colour is used.
- Silver Metallic finish can be achieved by adding particles to Pantone 877
- Mirror Finish can be supplied at extra cost. (Need to quote individual requirements.)