IKALOGIC MT25C Manuel utilisateur

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

Soware Quick Start guide (MT25C Interface) . . . . . . . . . . . . . . . . . . . . . . . . . . 16

MT25C User Manual MT25C

Mechanical data 17

Soware technical requirements 19

SerialportAPI........................................... 19

MT25CInterfacesoware .................................... 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

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 soware 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,

eectively 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.

Custom soware applications can be developped on demand. Contact us (cont[email protected]om) for

customization requests.

Note

: In this document the words “switch” and “button” are used interchangebly without aecting

the meaning.

MT25C User Manual MT25C

Typical applications

MT25C are typically used to test membrane keypads that include buttons and/or LEDs, but eectively,

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.

MT25C User Manual MT25C

Warning

Read safety information section carefully before using this instrument.

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

aer insertion of new membrane keypad.)

1s typical (max 3 seconds)

Capacitive switch detection times (including

communication delay via serial port)

100ms typical (maximum 250ms)

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 aect 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.

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.

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

Table des matières

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