A31T214/ 216 is a Cortex M0+ based MCU that supports capacitive touch. This product provides High Noise Immunity (CS10V) and Water Tolerance (preventing touch malfunction due to moisture), making it suitable for home appliances that are frequently exposed to water.

A31T214/ 216 features a built-in LED/ LCD Driver function that enables to implement Touch Input and Display using a single IC. In particular, the LED Driver function can be used as one of two types: conventional Matrix Type and T-Type where COM/ SEG swaps on one pin. Assuming that you control 8 x 8 LEDs, 16 IOs (8 + 8) are required when using the conventional Matrix Type LED/ LCD Driver, and only 9 IOs are required when using the T-Type LED/ LCD Driver.

The High Noise Immunity provided in A31T214/ 216 supports CS10 that meets the highest specification of IEC61000-4-3. The Water Tolerance of A31T214/ 216 prevents water droplets from being recognized as touch and enables normal touch recognition even in wet environment.

The figures below compare the operations when the Water Shield function of A31T214 is turned off and when it is turned on, while water droplets fall on the Touch PAD surface.

The figure on the left shows that Touch Data falls below Threshold when water droplets fall and is recognized as Ghost Touch (malfunction). The figure on the right shows that there is no malfunction when water droplets fall.

For all of ABOV’s capacitive touch MCU products, we provide Smart Touch Libraries that allow developers to easily implement Touch systems without having a basic knowledge of capacitive touch. The development-related materials can be downloaded free from ABOV website.

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