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TSC2007 Z1, Z2 definition

Bradley Helsel
Intellectual 260 points
Other Parts Discussed in Thread: TSC2007, DS92LX2121, DS92LX2122

Hello forum,

I am using a TSC2007 with a 7" touch screen. I am trying to determine the proper way to tell if a valid touch is being applied to the screen. Reading the TSC2007 data sheet, it seems that Z1 or Z2 can be used for this. Is it necessary to read both Z1 and Z2 values to validate the touch or can just one of the two be read?

I should also note that the I2C channel is also running through a DS92LX2121 / DS92LX2122 chipset.

Thanks.

Brad.

  • 0
    TI__Genius 9725 points

    Hello Brad,

    Using either Z1 or Z2 should be OK if you only need to tell if there is no-touch/noise/very-weak-touch or a true/strong touch. Note that the Z1 value from the TSC should be 0 if no touch or very small if noise/very-weak-touch; and the Z2 is the max (=4095 if 12-bit resolution) if no touch or very large if very- weak-touch. You may read from the TSC the Z1 or/and Z2. and then test with your touch panel and system to find a proper threshold.

    Regards,
    Wendy F.