STM32U535RET6QTR (with TSC) for Microwave Oven Capacitive Touch Control Panel

[Sakthi_IND]

Hi Team,

We I have shortlisted the STM32U535RET6QTR microcontroller for our microwave oven control panel. The MCU includes an integrated Touch Sensing Controller (TSC), and our design requires 8 capacitive touch keys.

Before finalizing the component selection, we require clarification on the following points to ensure compliance with home‑appliance safety and EMC standards:

1.Is the STM32U535RET6QTR suitable for microwave‑oven capacitive‑touch applications?

2.Does ST provide any dedicated capacitive‑touch sensing IC, apart from the built‑in TSC in STM32 MCUs?

3.What are the advantages of using STM32U535RET6QTR (with integrated TSC) compared to a dedicated touch‑sensing chip?

4.If we use the integrated TSC in STM32U535RET6QTR, what hardware challenges may occur?

5.What software‑related challenges can arise with the integrated TSC?

6.Can STM32U535RET6QTR meet home‑appliance certification requirements such as
IEC 60335‑1 / IEC 60730‑1 Class‑B?

7.For an 8‑key capacitive touch panel, what does ST recommend?
Use the integrated TSC of STM32U535RET6QTR, or use a separate dedicated touch controller?

Regards,

Sathiya

[mƎALLEm · Accepted solution]

Hello,

You can refer to AN4316 "How to tune touch sensing applications on STM32 MCUs"

If you need a detailed answers to your question, I suggest to open an online support ticket over this link: https://ols.st.com/