4.8 Self Testing

4.8.1 Introduction

When the self-test feature is enabled through the configuration profile, the device performs a check on all enabled capacitive sensing

inputs upon startup to determine whether the sensing input pins are erroneously shorted to ground or supply. If a short or open is found

on a sensor, the self test feature will signal that an error has been found through a port pin. The feature will then disable that sensor

before beginning touch qualification scans on all sensors left enabled.

4.8.2 Test Failure Signaling

If the self test check reveals an error, the device will toggle the I2C buffer interrupt pin at a frequency of 2 Hz. This toggling will persist

for two seconds if the device detects one or more self test errors.

4.9 Configuration Profile

The configuration interface is used by the device to configure default values and performance characteristics that effect capacitive

sensing. The configuration data can be programmed through the Configuration interface (Config Clk and Config Data pins) using [Con-

figurator] in Simplicity Studio.

Several configuration profile templates are available in Simplicity Studio to provide a starting point for development.

CPT112S Data Sheet

Functional Description

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