MTCH105-I/ST

Overview

The MTCH105-I/ST is a five-channel capacitive proximity and touch controller manufactured by Microchip Technology. It operates within an operating voltage range of 2.05V to 3.6V and supports an industrial temperature range from -40°C to +85°C. The device provides five digital outputs corresponding to its sensor inputs, utilizing active guarding capability to enhance signal integrity. Sensitivity and power modes are configurable via dedicated pins, while an advanced optimization algorithm actively suppresses noise for reliable detection.

Feature Summary

• Capacitive Proximity and Touch Detection System
• Simple I/O Interface with Existing System
• Flexible Low-Power Mode

Applications

• Light Switch
• Portable Device Enabler
• White Goods and Appliance
• 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. Confirm that the 'I' designation aligns with the required industrial temperature specifications for your application environment before finalizing procurement orders.

Selection Notes

Select this component when a system requires multiple independent touch or proximity channels without complex communication protocols. Ensure the design accommodates the open-drain nature of the MTOx outputs by including appropriate pull-up resistors on the PCB layout.

Part Context

This part belongs to the MTCH10X family, which includes single, dual, and eight-channel variants. All members share similar core functionalities but differ in channel count and pin configurations. This specific model provides a mid-range solution for applications needing more than two channels but fewer than eight.

Replacement Considerations

Direct replacements within the same family include the MTCH102 (2-channel) and MTCH108 (8-channel). Verify pin compatibility and channel requirements carefully, as physical pinouts differ across the family members despite shared functional blocks.

FAQ

How is the sensitivity of the MTCH105 adjusted?

Sensitivity is configured through the MTSA pin. Applying VDD results in the lowest sensitivity, while connecting to GND provides the highest sensitivity, with a linear adjustment available between these states.

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, improving the signal-to-noise ratio.

How does the MTPM pin affect operation?

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