QT60326-AS

Overview

The QT60326-AS is a QMatrix touch controller IC designed for detecting human touch on up to 32 keys arranged in an X-Y matrix. It utilizes transverse charge-transfer sensing technology, allowing detection through dielectric materials such as glass or plastic up to 5 cm thick. The device supports both SPI and UART communication interfaces, which are autodetected upon power-up. Key parameters include a maximum clock frequency of 16 MHz, a supply voltage range of 4.5 V to 5.5 V, and an operating temperature range of -40°C to +105°C. It features individual key sensitivity adjustment, adaptive auto-calibration, and adjacent key suppression.

Feature Summary

• Transverse charge-transfer sensing technology enables robust touch detection through various dielectric panels.
• Integrated adaptive auto-self-calibration and drift compensation algorithms ensure stability under environmental changes.
• Supports mixed key sizes and shapes within a single panel with individually adjustable sensitivity and response time.
• Dual interface capability with automatic selection between SPI slave and UART modes.

Applications

• Automotive control panels
• Industrial machine tool interfaces
• ATM machines and electronic kiosks
• Security keypansels
• Outdoor keypads and appliance controls

Procurement Notes

Verify the specific suffix 'AS' corresponds to the industrial temperature grade (-40°C to +105°C) and package type (TQFP-44) required for your design. Confirm that the host microcontroller supports either SPI or UART protocols, as the QT60326-AS autodetects the interface but cannot use both simultaneously. Ensure external components like the 16 MHz resonator and sample capacitors match the datasheet recommendations for stable operation.

Selection Notes

Select the QT60326-AS when exactly 32 touch keys are required within an X-Y matrix configuration. Choose this part over the QT60166-AS or QT60486-AS based on the specific number of input channels needed, as all variants share identical electrical characteristics except for key capacity. Consider the TQFP-44 package constraints and the need for external series resistors on scan lines for EMC compliance during PCB layout.

Part Context

The QT60326-AS belongs to the Quantum Research Group QMatrix family of digital charge-transfer sensors. This family includes variants supporting 16, 24, 32, and 48 keys. These devices are engineered for high-reliability applications requiring sealed, watertight control panels immune to vandalism and environmental factors. The technology minimizes external component count while providing sophisticated signal processing for stable performance.

Replacement Considerations

Direct substitutes within the same family include the QT60246-AS (24 keys) and QT60486-AS (48 keys), which share pinouts and functionality but differ in key capacity. Other Microchip or third-party capacitive touch controllers may require significant schematic and firmware redesign due to differences in sensing architecture and interface protocols.