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MSP430 capacitive touch solution recommending

Zhihong Huang
Intellectual 1550 points

Other Parts Discussed in Thread: MSP430FR2633, MSP430FR2522

Hi team，

 Now customers use Essemi's ES7P2032 as their capacitive touch solution MCU.

1. The customer is doing the standby power consumption test, that is, the power consumption test when the button is not triggered, and it is found that the standby current of the entire touchpad is 30 ~ 35uA.

2. Since the customer ’s touchpad is powered by a Button Battery battery, they believe that the standby current is a little bit higher.

3. Do we have a capacitive touch solution based on MSP430 that can achieve a lower standby current than this?

4. What is the lowest standby current that our existing capacitive button touch solution can achieve?

5. Could you please recommend capacitive touch solution whose stand by current is lowest among all our solution?

 

Best Regards,

Wesley Huang

Email: wesley-huang@ti.com

  • 0
    TI__Intellectual 2885 points

    Hi Huang,

    thanks for the question.

    What is the number of keys in this application? Do you have additional info on the design? That would be very helpful.

    CapTIvate is our capacitive touch solution with MSP430.

    The average current consumption depends on the configuration and the number of buttons. For example, a 4 button design will have an average consumption of around 1uA/button (it total around 4uA).

    An overview of the current consumption option can be found in the technology guide.

    Please check the technology guide for further information on the technology.

    As reference product, please check the MSP430FR2633 device product folder, where you can find all the information related to the technology and design examples.

    Please let me know if that info is sufficient as starting point.

    Best Regards

    Kostas

  • 0 in reply to Kostas Aslanidis
    TI__Intellectual 1550 points

    Hi Kostas,

    Thanks for your recommendation.

    1. The capacitive touch solution is used in the wireless air thermostat.

    2. The number of the key is 13.

    3. Now the customer test the capacitive touch board without the Bluetooth chip, and the standby current is 15~21uA

    4. the customer has no requirement about the Bits, flash and working frequency of the MCU, and they just want the low cost and low standby current,

    5. The technology guide you shared with me is good for the improvement of the Capacitive touch design. I think that we can share the technology guide to the customer and help them review the design according to the guide because the customer is not professional for the capacitive touch.

    Do we have the low cost capacitive touch solution  which can achieve lower standby current?

    I also want to know the price of our capacitive touch solution and I will send a separate e-mail to you.

    Best Regards,

    Wesley Huang

    Email: wesley-huang@ti.com

  • 0 in reply to Zhihong Huang
    TI__Intellectual 2885 points

    Hallo Huang,

    yes please share the tech guide link to the customer. in addition to that our design flow document gives a good overview about the technology and the single steps going through a design.

    Please also check the TI reference designs which have good examples and can be used by the customer.

    It would be good for the customer to have the development tools and EVM for tests.

    The BOOSTXL-Keypad design can be used as reference for 13 button customer design.

    To keep the lowest possible power consumption, our Wake on Proximity mode would be recommended. In that mode the unit is checking for a valid touch or proximity in low power mode before the MCU and peripherals are activated. Please refer to the tech guide and the design flow document.

    I would recommend the MSP430FR2522 device for this application.

    please let me know if you have any questions.

    Regards

    Kostas

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