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Does MSP430G2XXX Series ESD protected, And if yes then of what type?

vishal patil
Prodigy 90 points


Hello I was Designing Capacitive Touch Button pad  With   G2553  but I  found that Pin of controller has been dameged. It works well with Digital I/O (Logic Low , Logic High),But When analog function is enabled (that  is ADC or Capacitive touch)  it does not work  properly. For ADC it  show  false reading , and For capacitive application  it does not oscillate.

It happens only for only some pins only. After  few days the pins that  working properly  show false working . I can't understand Why like it is?  If it  is due to  Static Charge?  ( I don't  used any type of  static protection at that time). I  have hands on  AVR ,PIC.  For them  I never  cared about Static. Does MSP 430  is Highly static sensitive ?  Does It Do not have any  ESD  protection? I want that   B'cuase  I  want to use them in industrial application  where It will seem may problem. I  am new  to MSP 430. It is really nice controller with lots of  Analog facilities. I like that but I am getting problem with Touch sensing Application .It works well. but after some days pins get damaged.

then What I have to Do?

  • 0
    Guru 227245 points

    All MSP port pins do have internal CLAMP diodes which shortcut excess voltage (including most ESD events) to VCC/GND. However, the proteciton is limited to 2mA rated current.

    You observed that the strange effects only affect analog operation. It may be that ESD events affect the analog switches used to multiplex the input pins for analog usage. Maybe if the transientes are too fast for the clamp diodes.
    Actually I don't know. I didn't find my MSPs too sensitive to ESD in the past (industrial use too), but it may depend on application. And the low-cost G devices may be 'cheaper' in this respect too.

    You know that the "touch sensing" is about cpacitive touch sensing? So the pads have to be isolated from the touching finger.
    Of course the 'touch sense' will show apparently working results too when you directly touch a pin (the capacitance virtually rises to unlimited), but the inner circuitry isn't designed for this and will eventually break.

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