Regarding PSoC4S Self Test of CapSense_TST_SNS2SNS_SHORT

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YuMa_1534086
Level 7
Level 7
Distributor - Macnica (Japan)
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Hello Cypress.

Q1)

Customer says that test result of Self Test of CapSense_TST_SNS2SNS_SHORT changes depending on CapSense component version.

In 4.0 version, test result becomes pass.

But test result becomes fail at 6.0.

(Conditions other than CapSense Version does not change.)

Is there possibility that test result changes depending on CapSense version?

Has test procedure changed in V4.0 and V6.0?

Or is test procedure of V4.0 and V6.0 same?

Q2)

Below is description of CapSense component DS.

DS explains about adding VDDA test to Self Test.

Could you please let us know changes in Self Test other than below.

Customers would like to know what has changed from V4.0 to V6.0.

They think that there may be minor changes other than below because short test result changes depending on version.

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Best Regards.

Yutaka Matsubara

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1 Solution

Hello Matsubara-san,

CapSense_ExecuteSns2SnsShortExt() has been modified.

If you look at the function definition in CapSense V4, you can see that in case of ganged sensors, first all the pins with respect to it are set to pull-up drive mode and then we read all the sensor states to check if any sensor pin state reads '0'.

Since all the pins are high, a sensor to sensor short (pin short) with the ganged sensor could not be identified this way. This bug has been fixed in the next revision (CapSense V5).

I assume the customer is using ganged sensors. Pls ensure that the different ganged sensors are not shorted together.

Thanks,
Shanmathi

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