SX9501IULTRT

Touch Capacitive Sensor Overview

The SX9501IULTRT is a low-cost, ultra-low power capacitive controller featuring four dedicated sensor channels. It operates from a supply voltage of 2.7V to 5.5V and provides direct hardware interfacing without host software requirements. The device includes automatic calibration for stability across temperature variations and supports active, doze, and sleep modes with current consumption of 122 µA, 26 µA, and 2.1 µA respectively. It features open-drain outputs with 6 mA sink capability and six digital inputs for configuring sensitivity, threshold, and hysteresis.

Touch Capacitive Sensor Feature Summary

• Four-channel capacitive sensing with dedicated active-low open-drain outputs for direct proximity detection.
• Ultra-low power architecture supporting three operational modes: Active, Doze, and Sleep.
• On-chip auto-calibration circuitry to maintain performance against environmental drift.
• Hardware-configurable parameters via external pins for sensitivity, threshold, and hysteresis.

Touch Capacitive Sensor Applications

• TV remote control interfaces
• Mechanical button replacement in appliances
• Mobile appliance user interfaces

Touch Capacitive Sensor Procurement Notes

Verify the specific ordering suffix IULTRT corresponds to the QFN-20 package and reel quantity of 3000 units as documented. Confirm that the component meets RoHS and WEEE compliance standards required for your manufacturing process. Ensure the supplier provides valid traceability documentation for the Semtech manufacturer part number.

Touch Capacitive Sensor Selection Notes

Select this component when a software-free capacitive solution is required. The SX9501 eliminates the need for microcontroller polling by providing direct digital outputs. It is suitable for applications where power consumption must be minimized through automatic mode switching between active scanning and deep sleep states based on proximity events.

Touch Capacitive Sensor Part Context

The SX9501 belongs to Semtech's family of capacitive proximity controllers. It serves as a simplified alternative to programmable variants like the SX9500, offering fixed internal settings accessible only through external hardware pins. This design reduces development complexity for standard proximity sensing tasks.

Touch Capacitive Sensor Replacement Considerations

The SX9500 can functionally replace the SX9501 if its registers are configured to match the SX9501's default settings. Verify pin compatibility and ensure the replacement part supports the required QFN-20 package dimensions and thermal characteristics.