CAPSENSE™ & MagSense Forum Discussions

Hi, Infineon team,

I want to know how to design for CSX Touchpad.
It seems that there is the document of AN234185 PSoC™ 4 CAPSENSE™ Touchpad design guide .
But I can't reach this link: https://www.infineon.com/002-34185

The PCB reference data has been gotten from the link in this thread.
https://community.infineon.com/t5/ModusToolbox/PSOC-capsense-touchpad-handwriting/m-p/381127#M497

However, I would like to know the design rules, and why these designs should be used.
If possible, could you provide me the AN234185?

Best Regards,

Hello,

When two different types of overlays are stacked.
What is the formula for calculating capacitance?

In the case of one overlay, the following is

When overlaying two different types of overlays,
(The following is an image. For example, OVERLAY1 is glass, OVERLAY2 is PET film)

What is the formula for calculating capacitance?
(For example, will overlay 2 be added?)

Best Regards,
Kawata

Hello,

If the overlay has a slope as shown in the image below,
Is there anything I should be careful about when adjusting CAPSENSE?
(The following is an image)

How should I consider the capacitance when touched?
(Is it just the thickness of the overlay at the touched position?)

Best Regards,
Kawata

Hi,

I had read somewhere that the configuration has to be saved in flash in MBR Device. Can you tell me how to do this?

Regards D

Good morning everyone, I have a system with Psoc4100S-Plus, VDDA at 5V and VDDD at 3.3V.
The CapSense block is powered by VDDA.
Why is the Tx signal for CSX mode 3.3V?
Can it be set to 5V of VDDA?

Hi,

I was was researching input methods/switches for desktop use and I stumbled across this device https://www.native-instruments.com/en/products/maschine/production-systems/maschine-plus/ . I was able to interact with this device and what caught my interest the most were the (presumably) capacitive pads (the 4x4 grid with big rectangular buttons). They felt super responsive and I wanted to try and make a keyboard using similar type of input. I am confused, however, as to what components I would need for that project. The ones i'm unsure about are the buttons (I had a look at the MBR3 evaluation kit but I can't tell how the buttons are construted) that would sit behind the block of plastic (or other appropriate material similar to the one on the maschine device - I do want these to protrude out similar to keys on a keyboard), the touch microcontrollers, and then microcontrollers that are collecting the output from these. Eventually I want to go up to a tkl design which uses 108 keys. I also care about latency and reliability so a 1kHz polling would be expected (although I would consider designs up to 10kHz).

I am completely green when it comes to pcb design so I'd appreciate any help