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TSC2004: Basic working mode

ignacio sierrra
Prodigy 30 points
Part Number: TSC2004


Hi, thanks in advanced for any kind of help

Im considering to add the TSC2004 to my design and due is a battery device, consumption is always my bottleneck.

I do not have experience with such controllers and i need it to detect all the time possible actions on the resistive panel.

I saw on datasheet  that at 1,17KsPs with Vref=1,2V i can achive the lowest consumption of 39,4uA . For me this is a huge problem for my standby mode.

Then i saw this power down mode (0,023uA). My question is, if the device is in power down mode, i have no option than to use PINTDAV as interrupt to awake the host right?, besides to switch ON every X miliseconds or seconds. Is that correct?

Are no other option to decrease this stanby consumption but sampling the touch? because i can not say to the client, first you need to touch it and then enter the codes.

Maybe other controller from TI can help me with the consumption?

thanks!

  • 0
    TI__Mastermind 23030 points

    What exactly is your concern ? Is it that you would need two touches to bring out of power down and then read data?

  • 0 in reply to Sanjay Dixit
    Prodigy 30 points

    Hi, Sanjay!  sorry for my bad explanation.

    Making it simple, i have a 4 wires resistive touch with a pincode ( digits 0 to 9)  and i plan to use this TSC controller. Device is a battery power one.

    I need to be all the time sampling the pincode.

    My questions are:

    1)  In power down mode, when user touch pin 1( for example) , my host will not know that was pin 1, right? it will just get an interrupt to report that something has happened, right?

    2) If 1) is true, then, which is the lowest power mode i can find for my setup? 39,4u?

    3) any other controller from TI with lower consumption but sampling?

    many thanks in advanced! :-)

  • 0 in reply to ignacio sierrra
    TI__Mastermind 23030 points

    There is the TSC Mode1 in the IC. Here when the touchscreen is touched the TSC 2004 makes a pre programmed scan without any host intervention and stores the location data in a register. In addition PINTDAV pin  goes low as a result of the touch . This pin can be used as an interrupt for the MCU to read the data

    This means that the data on the first touch should be available. 

    Best regards

  • 0 in reply to Sanjay Dixit
    Prodigy 30 points

    Wow, thanks!

    So can i have the TSC in power down mode (0,0023uA / 0,8uA) working under Mode 1? that would solve completly all my problems!!!!!!!

    many thanks!!

  • 0 in reply to ignacio sierrra
    TI__Mastermind 23030 points

    I believe that in TSCMode 1 between touches the device switches off internal circuitry and goes to low power mode. The datasheet does indicate that

    on getting a touch in mode1, the device turns on internal clock and circuits. This indirectly seems to indicate that before touch the IC is in low power mode.

    I would suggest to try it out as a test. 

  • 0 in reply to Sanjay Dixit
    Prodigy 30 points

    I agree and i will do. :-)

    Many thanks for your inputs that guide me so well!

    best regards