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CCS/MSP430FR2512: Capacitive touch LCD overlay (professional touch panel), PLEASE point me in the right direction.....

Robert Clark59
Intellectual 930 points
Part Number: MSP430FR2512
Other Parts Discussed in Thread: MSP430FR4133,

Tool/software: Code Composer Studio

Hi Forum,

I have just 4 capacitive touch buttons (pads) on the front of my device. The touch panel will be professionally produced to fit this device, and will be on top of the LCD. I HAVE ZERO TOUCH PAD EXPERIENCE.

The question is this; The MSP430FR4133 has P1.x and P2.x with "capacitive touch" capability. The MSP430FR2512 has "captivate" technology, which I assume is way advanced over the '4133.

But do I need it?

Over the top of the touch panel will be the appropriate gorilla glass. Will the standard  "capacitive touch" capability be enough? Will it be reliable? Is it (very) easy to use?

If you have capacitive touch experience, and are an expert, please point me in the right direction.

Thank you in advance,

Robert.

  • 0
    TI__Expert 7015 points

    Hi, Robert, 

    The capcitive touch in MSP430FR4133 is designed with pin-oscillation theory. The capacitive touch in MSP430FR2512 is designed with high-performance charge-transfer CapTIvate technology. The CapTIvate technology has better performance than pin-oscillation technology for capacitive touch sensing. It is designed with ultra-low-power, high sensitivity, high-reliability and high-flexibility features. It is recommended to use CapTIvate technology device for capacitive touch applications. 

    It is because touch sensing products need to pass some EMC tests such as System-level ESD, Conductive noise, EFT, etc. If using CapTIvate MSP430 to implement the application, it will be easy to pass the tests. In addition, CapTIvate can work in LPM3 mode which can save the board power consumption. 

    Please refer to the link for more information about CapTIvate technology: http://www.ti.com/microcontrollers/msp430-ultra-low-power-mcus/capacitive-sensing-mcus-overview.html#peripheral

    It seems your application is to implement the touch on LCD panel. And you need a MCU with LCD driver module, right? Maybe you can consider to use MSP430FR2512 with a LCD module with driver built-in. The ITO touch button designed on the LCD module can be connected to MSP430FR2512 CapTIvate touch IOs. You can also use MSP430FR4133 to implement the touch on LCD panel function. But it will be challenged if your product has EMC immunity tests requirement. 

    Thanks, 

    Lixin 

  • 0 in reply to Lixin Chen1
    Intellectual 930 points

    Hi Lixin,

    Thank you for your very detailed response. Exactly what I needed.

    Have a great day!

    Robert.

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