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DYNASENSE – UNIQUE MEMBRANE KEYPAD

Engineered to suit harsh outdoor applications

DYNASENSE resistive input technology is incredibly robust and requires no complicated electronic interface. The discrete membrane keypad is designed to create the ‘feather touch’ feel of capacitive touch switches at a fraction of the cost.

Using proprietary innovative nano particle conductive ink technology, DYNASENSE enables designers to create user interfaces with plastic overlay materials of thicknesses from 0.15 to 0.75 mm. DYNASENSE allows a very sleek and seamless construction and has almost no mechanical movement. The maximum deflection is between 30 and 50 µm. As a consequence the lifetime can exceed 5 million switch cycles depending on the overlay material chosen.

The switching concept is basically emulated through lowering the electrical resistance, as in a traditional membrane switch. It is therefore easy to integrate and can be used with hardware platforms of existing membranes; no special integrated circuits or controller chips are required.

Despite its simplicity, DYNASENSE is the only technology that offers a wide operational temperature range from -40°C to +100°C thanks to the special graphene-based nano-carbon ink formulation that exhibits stable switch resistance over thermal fluctuations. These keypads are fully functional when actuated with gloves or other non-metallic actuators. They are ideal for medical and industrial settings or even harsh outdoor environments, where safety demands that workers wear hand protection.

‘DYNASENSE resistive input technology is incredibly robust and requires no complicated electronic interface.’

How the DYNASENSE technology works:

  1. The force applied on the overlay is transmitted to the force-sensing resistor material through a very thin spacer.
  2. This causes a drop in electrical resistance, which is detected by the electronics connected to the membrane circuitry, very similar to how traditional membrane switches are integrated
    into the controller.

DYNASENSE conductors with plug
DYNASENSE conductors with plug

Features
Advantages
Overlays up to 0.75 mm thickness

Vandal-proof

Can be actuated without contact with human skin/gloved actuation

Ease/safety of use

Continuous scrolling action requiring low actuation force

Readily accepted by user

No controller chips or firmware programming required

Seamless integration into existing platforms at lower costs than capacitive switches

Resistant to moisture and EMI

Reliable and durable for demanding environments

‘DYNASENSE is the only technology that offers a wide operational temperature from –40°C to +100°C.’

Actuation force*

Overlay thickness
Actuation force (gm force)
0.25 mm

43–71 gms

0.38 mm

85–170 gms

0.50 mm

200–300 gms

0.75 mm

250–400 gms

* Nominal values only for explanatory purpose, based on standard design conditions.

Technical data

No. of press cycles:

with 0.25 mm overlay foil > 5 million actuations|with 0.5 mm PC overlay > 10 million actuations

Operating temperature:

–40°C to +100°C

Storage temperature:

–40°C to +100°C

Resistance:

open > 1 MΩ / closed < 1 kΩ

Key distance (centre to centre):

minimum between 15 and 20 mm

IP protection:

possible, depending on design specifications

Switch type:

flat non-tactile switch type