STMicroelectronics

STMPE821QTR

STMPE821QTR Description

The STMPE821QTR is a highly integrated touch key controller designed for capacitive touch sensing applications. Manufactured by STMicroelectronics, this Interface IC Chip offers a robust solution for detecting touch inputs with high precision and reliability. The STMPE821QTR features up to 8 input channels, making it suitable for applications requiring multiple touch points. It operates within a supply voltage range of 2.7V to 3.6V and consumes a minimal supply current of 350µA, ensuring energy efficiency. The device supports an I2C interface for easy integration with microcontrollers and other systems. Housed in a 16-QFN package, it is designed for surface mount applications and is available in tape and reel packaging. The STMPE821QTR also includes up to 4 LED driver channels, providing additional functionality for user feedback mechanisms. With a resolution of 7 bits, it offers precise touch detection capabilities. Despite its obsolescence status, the STMPE821QTR remains a reliable choice for legacy systems and specific applications where its unique features are advantageous.

STMPE821QTR Features

• High Channel Capacity: Supports up to 8 input channels, enabling the detection of multiple touch points simultaneously.
• Energy Efficiency: Operates within a supply voltage range of 2.7V to 3.6V and consumes only 350µA of supply current, making it suitable for battery-powered and low-power applications.
• Robust Interface: Equipped with an I2C interface, facilitating seamless communication with microcontrollers and other system components.
• LED Driver Channels: Includes up to 4 LED driver channels, allowing for visual feedback mechanisms to enhance user experience.
• Surface Mount Compatibility: Designed for surface mount applications, ensuring ease of integration into modern PCB designs.
• Packaging: Available in tape and reel packaging, which is ideal for automated assembly processes.
• Resolution: Offers a resolution of 7 bits for precise touch detection.
• Regulatory Compliance: Complies with REACH and ROHS3 standards, ensuring environmental and safety standards are met.
• Moisture Sensitivity Level: MSL 3 (168 hours), indicating its suitability for various environmental conditions.

STMPE821QTR Applications

The STMPE821QTR is ideal for applications requiring reliable and precise touch key functionality. Its high channel capacity and energy efficiency make it suitable for a wide range of consumer electronics, industrial controls, and automotive applications. Specific use cases include:

• Consumer Electronics: In devices such as smartphones, tablets, and remote controls where multiple touch inputs are required.
• Industrial Controls: For touch panels and control interfaces in industrial machinery and equipment.
• Automotive Applications: In vehicle infotainment systems and control panels where robust touch detection is essential.
• Home Appliances: For touch-sensitive controls in appliances like washing machines, ovens, and refrigerators.
• Medical Devices: In medical equipment where precise touch control is necessary for user interaction.

Conclusion of STMPE821QTR

The STMPE821QTR, despite being marked as obsolete, remains a valuable component for applications requiring reliable touch key functionality. Its high channel capacity, energy efficiency, and robust I2C interface make it a versatile solution for various industries. The inclusion of LED driver channels enhances its functionality, providing additional user feedback mechanisms. Its compliance with REACH and ROHS3 standards ensures it meets environmental and safety regulations. While newer alternatives may exist, the STMPE821QTR continues to offer unique advantages for legacy systems and specific applications where its features are particularly beneficial.