SX8651IWLTRT

Overview

The SX8651IWLTRT is a multitouch controller designed for 4-wire resistive touchscreen applications. It integrates high reliability features including ±15kV ESD protection on input pins, eliminating the need for external protection devices. The device operates with a supply voltage range of 1.65V to 3.7V and utilizes an SPI serial interface for communication. Key internal components include a low-power 12-bit SAR ADC operating at 74k SPS and preprocessing algorithms to reduce host loading.

Feature Summary

• Multitouch capability for 4-wire resistive screens
• Superior on-chip ESD protection: ±15kV HBM and ±15kV Contact Discharge
• Extremely low power consumption: 23µA at 1.8V
• Integrated 12-bit SAR ADC with data averaging processing

Applications

• PDAs
• Portable instruments
• Point-of-sale terminal applications

Procurement Notes

Verify the specific suffix 'IWLTRT' against the manufacturer's official ordering guide to confirm package type (TQFN) and temperature grade. Ensure compatibility with existing PCB footprints for the 4mm x 3mm 14-DFN or equivalent package variant specified in the current datasheet revision.

Selection Notes

Select this component for designs requiring robust ESD immunity without external protection circuitry. The integrated preprocessing block reduces CPU overhead by handling touch coordinate computation and noise suppression. Verify that the host system supports the required SPI interface speed and voltage levels compatible with the 1.65V to 3.7V supply range.

Part Context

This part belongs to the Semtech SX865x series of resistive touchscreen controllers. It shares functional similarities with the SX8650 and SX8652 but offers specific multitouch support and optimized power characteristics for portable consumer electronics. The IWLTRT designation indicates a specific tape-and-reel packaging configuration.