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Inductive sensor matrix

molla gholi
Prodigy 120 points

hi everone

I decided to use TI inductive sensing solution in my design but i am not sure about it.

In my design i have 27 positions . Processor must be able to sense a copper strip reaching at each one of these positions.

This copper strip size is about 40x4 mm2 . This copper strip may contact the positions . In fact this copper strip

glued to a hammer and this hammer impact to each position like playing a marimba the musical instrument .

Each position has a PCB with special shape that must be about 130x8 mm2 .

So with this scheme is it possible to get a coil wire on such a PCB with 130x8 mm2 size for using inductive - Digital converters ?

Is it possible to use one converter for all 27 positions ? If it is possible how can i multiplex them ?

Is it possible to calculate the reaching speed of the copper strip for calculating impact force ?

As i said the copper strip contact to positions . If copper strip contact the coil wire on PCB is it cause any failure ?

If it cause any problem can it be avoided by using a solder mask on PCB ?

Thanks for your support.

  • 0
    TI__Genius 14270 points
    Hello Molla,

    The inductive sensor should not electrically connect the target; soldermask will work as an insulator but it is not very robust or reliable. It would be better to place the sensors on an inner layer, and use FR4 to electrically isolate the target from the sensor.

    You can use multiplexers with LDC devices if the signal supports it - refer to www.ti.com/.../tidu954.pdf.

    Regards,

    ChrisO