QT60240-ATG

Overview

The Microchip Technology QT60240-ATG is a digital burst mode charge-transfer touch sensor IC designed for matrix layout controls. It supports up to 24 keys within an 8x3 grid and utilizes patented spread-spectrum transverse sensing technology. The device operates on a supply voltage of 1.8V to 5.5V, with power consumption as low as 40µA in low-power mode. It features an I2C slave interface operating at 100kHz for data extraction and configuration. The component is housed in a 32-pin 5mm x 5mm MLF package and functions reliably across a temperature range of -40°C to +85°C.

Feature Summary

• Patented spread-spectrum charge-transfer technology minimizes electromagnetic interference and enhances noise immunity.
• Integrated self-calibration and auto drift compensation ensure stable operation under varying environmental conditions.
• Configurable detection integrators provide robust key activation confirmation through dual-tier counting mechanisms.
• Supports flexible electrode designs including PCB, FPCB, and conductive ink on various panel materials.

Applications

• Mobile phones and handheld devices
• Remote controls and consumer electronics
• Domestic appliances and PC peripherals
• Automotive control interfaces

Procurement Notes

Verify the specific ATG suffix against official documentation to confirm exact manufacturing lot or regional compliance details. Ensure compatibility with the 32-pin MLF footprint during procurement planning. Confirm availability status with authorized distributors as lead times may vary based on production cycles.

Selection Notes

Select this model when a maximum of 24 independent touch inputs are required within a compact form factor. It is suitable for applications needing high moisture tolerance and adjacent metal compatibility. Consider the I2C interface requirements and verify that the host system can support the necessary pull-up resistors and address configurations.

Part Context

The QT60240 belongs to the QMatrix family of touch sensor controllers from Microchip Technology. It shares architectural similarities with the QT60160 but offers double the key capacity. This series is engineered for low-cost mobile and consumer electronics, providing a complete signal processing solution without external amplifiers.

Replacement Considerations

The QT60160 serves as a functional substitute if fewer than 16 keys are required, sharing identical pinouts and software compatibility. Verify that the replacement part number matches the specific thermal and electrical specifications needed for the target application environment.

FAQ

How does the device handle signal saturation?

Signal saturation occurs if the Cs capacitor voltage drops below -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?

This hard-wired feature uses frequency chirping to drastically reduce EMI effects on sensor keys while simultaneously spreading RF emissions, ensuring robust operation in noisy environments.

Can unused Y lines be left open?

Yes, unused Y lines should be left open, and their corresponding Cs capacitors may be omitted. However, all active signal-related discrete parts must be placed very close to the chip body.