QT60240-ISG

Overview

The QT60240-ISG is a digital touch sensor IC from Microchip Technology's QMatrix series, supporting up to 24 keys. It utilizes patented spread-spectrum charge-transfer technology for stable sensing under varying conditions. The device operates on a 1.8V to 5.25V supply with a typical current consumption of 4.6mA. It features a 10-bit resolution and communicates via an I2C slave interface at 100kHz. The component is housed in a 32-pin 5x5mm MLF package and supports an operating temperature range of -40°C to +85°C.

Feature Summary

• Employs transverse charge-transfer sensing technology that converts electrical charge directly to digital form without amplifiers.
• Includes self-calibration, auto drift compensation, noise filtering, and Adjacent Key Suppression for robust performance.
• Supports individual key sensitivity settings and detection integrators for configurable noise resistance.
• Features spread-spectrum burst modulation to reduce EMI effects and spread RF emissions.

Applications

• Mobile phones
• Remote controls
• Domestic appliances
• PC peripherals
• Automotive interfaces

Procurement Notes

Verify the specific ordering suffix ISG against the manufacturer's official documentation to confirm the exact package type and temperature rating. Ensure compatibility with the required I2C bus voltage levels and check for any recent Product Change Notifications regarding assembly sites or marking changes before finalizing procurement plans.

Selection Notes

Select this model when a maximum of 24 touch inputs are required within a compact footprint. Consider the QMatrix architecture if mixed key sizes and shapes are needed on a single panel. Evaluate the power consumption requirements against the low-power mode specifications if battery operation is critical for the target application.

Part Context

This component belongs to the QT60xx0 family of digital burst mode charge-transfer sensors. It shares identical hardware and functional characteristics with the QT60160, differing only in the maximum supported key count. Both devices utilize the same 32-pin MLF package and support the same matrix grid configuration for flexible touch interface designs.

Replacement Considerations

The QT60160 is a functionally equivalent alternative within the same family, offering support for up to 16 keys instead of 24. No other direct substitutes are confirmed in the provided documentation. Verify pinout and software compatibility when considering cross-model replacements.

FAQ

How does the device handle signal saturation?

Signal saturation occurs if the Cs capacitor voltage becomes more negative than -0.25V. This can be mitigated by reducing the burst length, increasing the Cs value, or adjusting the PCB layout to reduce stray capacitance.

What is the purpose of the Spread Spectrum Acquisitions feature?

Spread spectrum burst modulation drastically reduces the possibility of EMI effects on the sensor keys while simultaneously spreading RF emissions. This feature is hard-wired into the device and cannot be disabled.

Can unused Y lines be left open?

Yes, unused Y lines should be left open. Their corresponding Cs capacitors may be omitted, and the pins can be left floating without affecting the operation of active keys.