MTCH101T-I/OT

Overview

The MTCH101T-I/OT is a single-channel capacitive proximity detector manufactured by Microchip Technology. It operates within a supply voltage range of 2.0V to 5.5V and supports an industrial temperature range from -40°C to +85°C. The device integrates high signal-to-noise ratio detection with adjustable sensitivity via the MTSA pin. It features two power modes: Normal mode consumes approximately 120µA at 3.3V, while Low-Power mode reduces consumption to roughly 54µA. Response times vary between 76ms and 890ms depending on configuration. The component is housed in a 6-lead SOT-23 package.

Feature Summary

• Capacitive proximity detection system with high signal-to-noise ratio
• Adjustable sensitivity and automatic environmental compensation
• Configurable low-power mode selection via hardware input
• Active-low open-drain output for host interface or LED indication

Applications

• Light switches
• Portable device enablers
• White goods and appliances
• Office equipment and toys
• Display and keypad backlighting activation

Procurement Notes

Verify the ordering suffix 'T' confirms tape and reel packaging rather than standard bulk. Confirm the 'I' designation matches the required industrial temperature range of -40°C to +85°C. Ensure the 'OT' suffix corresponds to the 6-pin SOT-23 package type. Cross-reference the specific revision level against current datasheet documentation.

Selection Notes

Select this component for applications requiring a single-channel proximity sensor with minimal external components. The MTCH101 supports various conductive sensor materials including copper pads, silver ink, and ITO. Sensitivity can be dynamically adjusted using a DAC or PWM signal from a host microcontroller. The active-low output simplifies integration with digital inputs.

Part Context

The MTCH101 belongs to Microchip's family of simple capacitive touch sensors. It provides a standalone solution for proximity detection without complex calibration routines. The device utilizes advanced optimization algorithms to suppress noise and maintain reliable detection through non-conductive front panels like plastic or wood.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

How is the sensitivity of the MTCH101 adjusted?

Sensitivity is adjusted via the MTSA pin. Applying VDD results in the lowest sensitivity, while GND provides the highest. It can be set statically with a resistor ladder or dynamically using a DAC or PWM signal.

What methods are available to reset the device if it gets stuck?

The device can be reset by toggling the MTPM pin with a pulse of at least 4.5 ms, or by touching the sensor pad and then releasing it. This releases the proximity-detected state without repowering the device.

Can the MTCH101 detect through metal front panels?

No, the datasheet specifies that the device works through plastic, glass, or wood front panels. It does not list metal as a supported material for the front panel covering the sensor.