SCHURTER GmbH
D – 79346 Endingen
www.schurter.com
Product manual
Piezo Keypad
Contents
Contents ......................................................................................................................................... 1
1
2
PRODUCT DESCRIPTION ...................................................................................................... 2
TECHNICAL DATA AND DIMENSIONAL DRAWINGS.......................................................... 3
2.1 Technical Data ................................................................................................................. 3
2.2 Layout of 12 key keypad .................................................................................................. 5
2.3 Layout of 16 key keypad .................................................................................................. 6
2.4 Circuit diagram ................................................................................................................. 7
3
4
ORDER NUMBERS ................................................................................................................. 8
ACCESSORIES ....................................................................................................................... 8
4.1 Accessory Kit ................................................................................................................... 8
4.2 Dimensions Accessory Kit ............................................................................................... 9
5
6
PACKAGING ......................................................................................................................... 11
QUALIFICATION TEST ......................................................................................................... 11
6.1 Degree of Protection ...................................................................................................... 11
6.2 EMC Protection .............................................................................................................. 11
7
8
APPROVALS ......................................................................................................................... 12
ROHS COMPLIANT .............................................................................................................. 12
Changes that contribute to technical improvement are subject to alternations.
page
1 of 12
Issue date:
27.08.2008
created by:
M. Fischer
amendment date:
20.07.2009
released by:
H-P. Friedrich
amendment no.:
500007028
datasheet no.:
index
0105.9539.200
c
Print date: 20/07/2009 11:29:00
SCHURTER GmbH
D – 79346 Endingen
www.schurter.com
1
PRODUCT DESCRIPTION
With the new piezo keypads SCHURTER provides input
systems that are impervious to all kinds of dirt and fluids. The
keypads are particularly suitable for use in outdoor
applications due to their ability to resist extreme ambient
conditions such as negative temperatures, ice and snow. The
keypads fulfil the IP 69K protection class and have a reliable
operating temperature from -25°C to +85°C. The mounting
accessories from SCHURTER enable the keypad to be sealed
into the housing with the IP 68 protection class. The piezo
keypads can be mounted into the housing from the front or the
rear.
As a standard, the keypads are available as a number block
with 12 or 16 keys and with an aluminium front. Point
illumination may be integrated into the individual key fields as
optical feedback or for user navigation. The operating panel can be designed in several colours in
both the aluminium and stainless steel versions. In addition, the keypads can be adapted to
customer requirements with respect to the outer geometry as well as to the number and
arrangement of the keys.
By using the piezo principle, the keypads are free of mechanical parts and therefore have an
extremely long lifetime of more than 20 million actuations. The completely sealed operating panel is
easy to clean and is resistant to common cleaning agents. The metal surface with an IK 05 impact
strength renders the keypads highly resistant to impacts from outside. The piezo keypads have
lower maintenance costs than other input systems while still providing a high level of functionality
and reliability.
Operation principle:
The piezo keypad is based on the principle of the piezoelectric effect. By pressing, a piezoceramic
generates a voltage pulse. The power of the voltage pulse is amplified from the integrated electronic
circuit to a bipolar switching output.
During the voltage pulse the electronic is switching for the specified pulse duration. The The
switching time of the electronic switching output depends on the actuation force and the operation
speed.
Connection diagram of a single switch NO (Normally Closed):
In the unactuated condition, the piezo ceramic is in a high-impedance state and the switch has an
output resistance greater than 10 MOhms. If the piezo-ceramic is actuated, the output resistance is
reduced to a value smaller than 20 ohms.
This corresponds largely to the functionality of a conventional mechanical switch.
Changes that contribute to technical improvement are subject to alternations.
page
2 of 12
Issue date:
27.08.2008
created by:
M. Fischer
amendment date:
20.07.2009
released by:
H-P. Friedrich
amendment no.:
500007028
datasheet no.:
index
0105.9539.200
c
Print date: 20/07/2009 11:29:00
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