RTOS/CC1310: CC1310 capacitive sensing buttons issue

user4187244

Prodigy 50 points

Part Number: CC1310

Tool/software: TI-RTOS

Hi,

I need eight capacitive touch key by using CC1310,

When I setup with Sensor Controller Studio, I/O mapping has some error.

Question:

May I setup "Cap touch external reference resistor" pin to other I/O pin?

Thanks!

over 6 years ago

0 TER over 6 years ago

TI__Guru**** 317180 points

No, the external resistor has to be on one of the 8 analog capable pins. We haven't tested solutions with more than 7 cap sense pins but you can look into two options:
- Use a mux to connect more than one cap sense button to one pin
- Use the pins to scan a matrix.

The first option sounds like the best option to test in your case.

0 user4187244 over 6 years ago in reply to TER

Prodigy 50 points

Hi TER,

Thanks for your reply,

For solution 1, may I use 74LVC1G3157 analog switch to expansion cap touch pad?
B1, B2 connect to each touch pad, and A connect to a cap touch pin.

0 TER over 6 years ago in reply to user4187244

TI__Guru**** 317180 points

I believe that may work. As I wrote we haven't tested this option, we currently have it on the future development list. Meaning that it may be factors we haven't thought about. But it should be fairly easy to test using a EVM for the switch and a launchpad.

0 user4187244 over 6 years ago in reply to TER

Prodigy 50 points

Ok,
I will try it,
Thank you so much!

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RTOS/CC1310: CC1310 capacitive sensing buttons issue