MTCH108-I/SS

Overview

The MTCH108-I/SS is a capacitive proximity and touch controller from the Microchip mTouch family, designed for applications requiring simple digital output interfaces. It features eight sensor inputs with active guarding capability to suppress noise and ensure reliable detection. The device operates within a voltage range of 2.05V to 3.6V and supports an operating temperature range of -40°C to +85°C. It utilizes open-drain outputs that require pull-up resistors and allows sensitivity adjustment via the MTSA pin. The SSOP-20 package provides a compact solution for integrating touch functionality into embedded systems.

Feature Summary

• Capacitive proximity and touch detection system with high signal-to-noise ratio
• Multi-stage active noise suppression filters for reliable operation
• Flexible low-power mode selectable via hardware pin configuration
• Brown-out protection included for system stability

Applications

• Light switch activation
• Portable device enabler
• White goods and appliance control panels
• Office equipment and toys
• Display and keypad back-lighting activation

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature grade. Ensure compatibility with the required supply voltage range of 2.05V to 3.6V. Confirm that the application circuit includes necessary pull-up resistors for the open-drain outputs. Check for any recent product change notifications regarding manufacturing sites or materials.

Selection Notes

Select this component when eight independent touch or proximity channels are required with minimal firmware overhead. The MTCH108 is suitable for designs needing hardware-configurable sensitivity and power modes. Consider the SSOP-20 package constraints for PCB layout. Evaluate if the active guarding feature meets the noise immunity requirements of the target environment compared to other channel counts in the family.

Part Context

The MTCH108 belongs to the MTCH10x family, which also includes the two-channel MTCH102 and five-channel MTCH105. These devices share similar core functionalities, including active guarding and simple digital I/O interfaces. The family is optimized for embedded applications where ease of integration and robust performance in noisy environments are priorities. All members support flexible low-power modes and brown-out protection.

Replacement Considerations

The MTCH105 offers five channels instead of eight, while the MTCH102 provides only two channels. Both use the same interface logic but differ in pin count and input capacity. Verify pinout compatibility and software/firmware requirements before substituting, as the number of detectable sensors will change significantly.