MTCH105-I/ML

Overview

The MTCH105-I/ML is a capacitive proximity and touch controller from the Microchip mTouch family, designed for applications requiring simple digital output interfaces. It features five 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. Sensitivity and power modes are configurable via external pins (MTSA and MTPM). It utilizes an advanced optimization algorithm for environmental compensation and multi-stage active noise suppression.

Feature Summary

• Capacitive Proximity and Touch Detection System
• Active Guarding Capability
• Multi-stage Active Noise Suppression Filters
• Automatic Environmental Compensation

Applications

• Light Switches
• Portable Device Enablers
• White Goods and Appliances
• 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 that any pin configuration changes or functional modifications associated with suffix variations are explicitly documented by the manufacturer before procurement.

Selection Notes

Select this component when a system requires multiple independent touch or proximity inputs without complex communication protocols. The MTCH105 provides five channels suitable for replacing mechanical switches in consumer electronics where low firmware overhead and high noise immunity are critical design constraints.

Part Context

This part belongs to the MTCH102/105/108 family of proximity/touch controllers. While sharing core architecture with the two-channel MTCH102 and eight-channel MTCH108, the MTCH105 specifically offers five sensor inputs. All variants utilize similar active guarding and noise suppression technologies.

Replacement Considerations

Direct substitutes within the same family include the MTCH102 for fewer channels or the MTCH108 for more channels. Verify pin compatibility and channel count requirements before substituting.

FAQ

How is sensitivity adjusted on the MTCH105?

Sensitivity is adjusted via the MTSA pin. Applying VDD results in the lowest sensitivity, while applying GND results in the highest sensitivity, with a linear voltage relationship between the two extremes.

What is the function of the Guard pin on the MTCH105?

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

How does the MTPM pin affect operation?

Grounding the MTPM pin places the device in Low-Power mode, which increases response time. Connecting MTPM to VDD enables faster response times at the cost of higher power consumption.