CY8CMBR3116 proximity consumption

spyhabs · ‎May 07, 2021

Hello,

I have a question related to the proximity consumption. I noticed that the proximity consumption is similar to scan 12 buttons at 200 ms. Is it possible to find a spec somewhere describing proximity current?

My board with 1 button scan only, I measured ~40 uA.

Board with 12 buttons, no proximity enabled : ~110 uA.

Board with 12 buttons, proximity CS1 activated : ~105 uA.

So, I'd preferred to have consumption with around 40uA like one button. It's why I am confused about this... bad configuration?

Thanks

Hari · ‎May 09, 2021

Hi @spyhabs

The increase in current consumption is expected as the sensing time is increased when more sensors are present. Note that for button sensors, the MBR3 can assign a lower resolution, but for proximity sensors, the sensor always scans at 16 bit resolution. Therefore, the time the CapSense sensors are scanned increases and thereby, the current consumed also increases.

You can check the approximate current consumption by entering the relevant parameters in the Design Toolbox which you can obtain by going to Configurations > Open design toolbox in EZ-Click software.

Best regards,
Hari

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CY8CMBR3116 proximity consumption

CY8CMBR3116 proximity consumption

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