MTCH108-I/GZ

Overview

The MTCH108-I/GZ is an 8-channel capacitive proximity and touch controller from Microchip Technology. It features active guarding to shield sensor inputs from noise, ensuring high signal-to-noise ratio detection. The device operates within a voltage range of 2.05V to 3.6V and supports an industrial temperature range of -40°C to +85°C. Sensitivity is adjustable via the MTSA pin, while power consumption and response time are configurable through the MTPM pin. The IC provides eight open-drain digital outputs that pull low upon detection.

Feature Summary

• Implements multi-stage active noise suppression filters for reliable detection in electrically noisy environments.
• Features automatic environmental compensation to maintain sensitivity across varying conditions.
• Includes brown-out protection to ensure stable operation during voltage fluctuations.

Applications

• Light switch activation
• Portable device enabler
• White goods and appliance control panels

Procurement Notes

Verify the specific suffix 'I/GZ' against the manufacturer's official documentation to confirm the operating temperature grade and package type. Ensure the ordering information matches the exact datasheet revision required for your design specifications.

Selection Notes

Select this component when eight independent proximity or touch channels are required. Consider the MTCH105 or MTCH102 if fewer channels suffice. Evaluate the need for active guarding on the MTI2 input to mitigate interference from nearby circuitry.

Part Context

This part belongs to the mTouch MTCH10x family, which includes the MTCH101, MTCH102, and MTCH105 variants. These devices share similar core functionalities but differ in channel count and package options. The MTCH108 specifically targets applications requiring multiple simultaneous touch or proximity inputs.

Replacement Considerations

Direct substitutes within the same family include the MTCH105 and MTCH102, provided the application requires fewer than eight channels. Verify pin compatibility and software configuration requirements before swapping models.

FAQ

How is the sensitivity of the MTCH108 adjusted?

Sensitivity is controlled by the voltage applied to the MTSA pin. A voltage equal to VDD provides the lowest sensitivity, while GND provides the highest sensitivity, with linear adjustment in between.

What is the function of the Guard pin?

The Guard pin (MTI2) drives a waveform in phase with the sensor input to shield it from nearby noise sources or power planes, improving signal integrity.

How does the MTPM pin affect operation?

Grounding the MTPM pin enables Low-Power mode, resulting in slower response times. Connecting it to VDD increases power consumption but provides faster response times.