IKALOGIC MT25C Bedienungsanleitung
MT25C datasheet and user manual
Membrane keypad, LEDs and capacitive button tester
www.ikalogic.com | support@ikalogic.com
April 1, 2022
MT25C User Manual MT25C
Contents
MT25C overview 4
Typicalapplications ....................................... 5
Producthighlights ........................................ 5
Warning 6
Main characteristics 7
Powerrequirements ....................................... 7
Operatingconditions....................................... 7
Testsystem ............................................ 7
MT25C interfaces 8
Interfacingtouserkeypad..................................... 8
Principle of operation 9
Serial interface 9
Commandconstruction ..................................... 9
Pinstates ............................................. 9
Listofserialcommands ..................................... 10
RequestID ......................................... 10
Loadconfiguration..................................... 11
Set insertion detection mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Keypadinsertedevent ................................... 11
Request a static measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Staticmeasurementevent................................. 12
Request a mechanical buttons measurements . . . . . . . . . . . . . . . . . . . . . . 13
Mechanical button measurement event . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Request a capacitive buttons measurement . . . . . . . . . . . . . . . . . . . . . . . 14
Capacitive button measurement event . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Setremovaldetectionmode................................ 14
Keypadinsertedevent ................................... 15
What’s in the box 15
Unpacking and first usage 16
StatusLEDsbehavior....................................... 16
Soware Quick Start guide (MT25C Interface) . . . . . . . . . . . . . . . . . . . . . . . . . . 16
(c) Ikalogic SAS 2019 2/23
MT25C User Manual MT25C
Mechanical data 17
Soware technical requirements 19
SerialportAPI........................................... 19
MT25CInterfacesoware .................................... 19
Ordering information 19
Accessories, maintenance and customer support 19
Certifications and regulations 19
Safety information 21
Symbolsdefinitions ....................................... 21
Importantsafetynotes...................................... 21
Limited warranty & limitation of liability 22
Document Revisions 23
(c) Ikalogic SAS 2019 3/23
MT25C User Manual MT25C
MT25C overview
MT25C devices are membrane keypad tester capable of testing up to 25 dome buttons, capacitive
buttons or LEDs. MT25C needs to connect to computer for proper operation. A soware is provided free
of charge to control the MT25C device, display live results and log the history of all testing operations.
Alternatively, the user may directly inteface with the MT25C hardware via a virtual serial interface,
eectively allowing unlimited integration possibilities into exisiting testing infrastructure.
MT25C are optimized for industrial testing applications, and are highly configurable.
Figure 1: MT25C Membrane keypad tester
MT25C interfaces with the systems under test by the mean of an industry-standard DB25 connector.
customization requests.
Note
: In this document the words “switch” and “button” are used interchangebly without aecting
the meaning.
(c) Ikalogic SAS 2019 4/23
MT25C User Manual MT25C
Typical applications
MT25C are typically used to test membrane keypads that include buttons and/or LEDs, but eectively,
they can be used for any application that requires the testing of a number of buttons.
The keypad configurations that can be tested are (but not limited to):
•Dome switches with a common line
•Dome swithces in a matrix configuration
•Capacitive tactile switches
•Independent unidirectional or bidrectionnal LEDs (detect LED inversion)
•Unidirectional LEDs with a common line
•Unidirectional LEDs in a matrix configuration
Note 1
: It’s not possible to test capacitive switches and dome switches simultaneously. It’s, however,
possible to test capacitive and dome switches seperately on the same membrane keypad.
Note 1
: It’s
not possible to test switch matrix and LED matrix that share the same lines.
Product highlights
•Handle up to 25 contacts, configurable as LEDs, short-circuits, common, or switches.
•Handles matrix configuration for LEDs and switches.
•Detect LED color (using forward voltage drop measurement).
•
Automatic detection of membrane insertion and removal (if there is at least 1 LED or 1 common
line).
•Training mode to quickly record all valid contacts for a specific membrane keypad.
•Fast operation: Detects all static information (e.g. LEDs, short-circuits) in less than 250ms.
•
Versatile, easy to operate and fully documented serial interface allows full control of the MT25C
device.
(c) Ikalogic SAS 2019 5/23
MT25C User Manual MT25C
Main characteristics
Power requirements
Input power connector USB (Type B)
Input current (Maximum) 200 mA
Input voltage 5V V ±0.25 V
Protection ESD on all connectors and all contacts
Operating conditions
Room Temperature 10°C to 35°C
Relative humidity < 80% non condensing
Altitude < 2000m
Test system
Number of individual test points 25
Maximum LED voltage drop 3V
Contact resistance adjustement Yes, from 1Ωto 100Ω
Contact switch detection times (including
communication delay via serial port.)
100ms typical (maximum 250ms)
Capacitive switch detection Yes, accepts key capacitance from 1pF to 30pF
Capacitive switch calibration time (Needed once
aer insertion of new membrane keypad.)
1s typical (max 3 seconds)
Capacitive switch detection times (including
communication delay via serial port)
100ms typical (maximum 250ms)
(c) Ikalogic SAS 2019 7/23
MT25C User Manual MT25C
MT25C interfaces
MT25C devices connect to a host computer via USB port (type B) on the back panel as shown in the
image below.
Figure 2: MT25C Back panel
On the front panel, a standard female DB25 port exposes the 25 test points as well as a status LED.
Figure 3: MT25C Front panel
Interfacing to user keypad.
The user is required to design a specific interface for his application to connect the MT25 to the keypad
being tested. A custom DB25 cable can be used for this purpose. It’s recommended to limit the length
of the wires between the MT25C device and keypad being tested to 150mm. Longer distances are also
acceptable but may aect the precision of the measurements.
Special care should be taken when interfacing to capacitive keypads. As with any capacitive switches
system, the length of the wires between the capacitive electrodes and the test system are critical and
should be reduced as much as possible.
(c) Ikalogic SAS 2019 8/23
MT25C User Manual MT25C
Principle of operation
Serial interface
MT25C is operated via a virtual serial interface (emulated over USB port.)
The user can either use a freely available C++ application to configure and use the MT25C device or
design his own test system by sending and receiving serial commands over the serial port.
This chapter focuses on the latest scenario, where a user needs to have knowledge low level serial
commands to control the operation of the MT25C hardware.
Command construction
A command is composed of several parts described below
Header Size Command Payload CRC
1 Byte 2 Bytes 1 byte N Bytes 2 bytes
x55 Size of command,
payload and CRC
Command Payload 16bit CCITT
calculated over the
command byte and
the N payload bytes
(the size bytes are
not used in CRC
calculation).
Each command set by the computer is acknowledged back by MT25C device by sending back a 0
payload packet with the same command to the host computer.
Pin states
Viewed from MT24C device measurement system, and depending on the current measurement context,
a pin can have various states as it’s summarized in the table below.
(c) Ikalogic SAS 2019 9/23
MT25C User Manual MT25C
Measurement context Pin state
Pin state
value description
Static measurement LED-A 0x01 LED Anode
Static measurement LED-C 0x02 LED Cathode
Static measurement LED-AC 0x03 Bidirectionnal LED
Static measurement SHORT 0x04 Short circuit (resistance less than the
maximum resistance allowed for a closed
switch)
Static measurement COM 0x05 Pin is common between several other pin
pairs. Note: in a matrix configuration, pin are
not considered as common.
Mechanical button
measurement
BUT0 0x10 Mechanical button released (dome switch or
alike).
Mechanical button
measurement
BUT1 0x11 Mechanical button pressed (dome switch or
alike).
Capacitive button
measurement
TCH0 0x20 Capacitive touch released.
Capacitive button
measurement
TCH1 0x21 Capacitive touch pressed.
List of serial commands
Request ID
Command name ID
Command code 0x00
Description This command is sent by the host computer to identify an MT25C device
plugged on the serial port. The MT25C shall respond with the following
payload: “MT25C” or the bytes array: {0x4D, 0x54, 0x32, 0x35, 0x43}.
Payload size 0
Payload N/A
(c) Ikalogic SAS 2019 10/23
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