STMPE24M31QTR

Touch Capacitive Sensor Overview

The STMPE24M31QTR is a capacitive touchkey controller from the S-Touch family, manufactured by STMicroelectronics. It integrates up to 24 capacitive sensor inputs with independent automatic calibration and 15 fF resolution across 512 steps. The device features two ratiometric engines for slider/wheel implementation and eight PWM controllers supporting up to 16 LED outputs. It operates on a 2.7 V to 5.5 V supply (VIO) with an internal 1.65–1.95 V core voltage. Current consumption is 400 µA in active mode, 50 µA in sleep, and 5 µA in hibernate. Communication is via I2C at up to 400 kHz. It provides 8 kV HBM ESD protection and is housed in a QFN40 (5x5 mm) package.

Touch Capacitive Sensor Feature Summary

• Integrates up to 24 capacitive sensing channels with high sensitivity and noise tolerance.
• Includes two hardwired ratiometric engines enabling slider or wheel functionality without external computation.
• Features eight independent PWM controllers capable of driving up to 16 LEDs with brightness control and blinking capabilities.
• Supports multiple power states including active, sleep, and hibernate modes for optimized energy efficiency.

Touch Capacitive Sensor Applications

• Notebook computer multimedia bars
• Portable media players and game consoles
• Mobile phones and smartphones

Touch Capacitive Sensor Procurement Notes

Verify component authenticity through authorized distributors as this part may be obsolete. Confirm package integrity and pin alignment before integration. Check for RoHS compliance documentation if required for specific regulatory standards. Ensure proper handling due to ESD sensitivity despite built-in protection mechanisms.

Touch Capacitive Sensor Selection Notes

Select the STMPE24M31QTR when 24 capacitive channels are required for complex user interfaces. Compare against the STMPE16M31QTR if fewer channels suffice. Consider the integrated PWM and ratio engine capabilities for applications requiring direct LED control and slider input without additional microcontroller processing overhead.

Touch Capacitive Sensor Part Context

This component belongs to the STMPE16/24M31 series of S-Touch controllers. It shares architectural similarities with the STMPE16M31 but offers double the capacitive input capacity. Both devices utilize the same I2C interface protocol and power management strategies within the STMicroelectronics peripheral controller portfolio.

Touch Capacitive Sensor Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation. The STMPE16M31QTR serves as a lower-channel variant within the same product family.