SX9512EWLTRT

Overview

The SX9512EWLTRT is an 8-channel capacitive touch sensor controller with proximity detection, LED drivers, and analog outputs. It operates on a 2.7V to 5.5V core supply (VDD) and a 1.65V to 5.5V I/O supply (SVDD). The device features 8 button channels with 40pF offset compensation, 8-channel LED drivers providing up to 15mA output current, and two 6-bit DAC programmable analog outputs. It supports a 400kHz I2C interface and includes a programmable buzzer driver. Power consumption is 330uA in sleep mode and 600uA in operating mode. It functions within an ambient temperature range of -40°C to +85°C.

Feature Summary

• Autonomous operation capability without external I2C communication for basic sensing tasks
• Integrated metal overlay UI design support for robust capacitive sensing
• Dual analog output interfaces allowing direct replacement of legacy mechanical controllers
• Adaptive measurement technology ensuring reliable detection across varying environmental conditions

Applications

• LCD TVs and monitors
• White goods appliances
• Consumer products and instrumentation
• Automotive control panels
• Mechanical button replacement systems

Procurement Notes

Verify the specific ordering suffix EWLTRT against the manufacturer's official documentation to confirm package type and marking details. Ensure compatibility with host system voltage levels, as SVDD must be less than or equal to VDD. Confirm RoHS compliance status through the latest datasheet revision before finalizing procurement specifications.

Selection Notes

Select this component when an 8-button capacitive interface with integrated proximity sensing is required. Consider the separate core and I/O supply architecture if level shifting between logic domains is necessary. Evaluate the analog output feature if direct voltage-based feedback to a host processor is preferred over digital I2C communication for button states.

Part Context

This part belongs to the Semtech SX951x family of capacitive touch controllers. It shares functional similarities with the SX9513 but adds proximity sensing capabilities. The 'B' variants in this family utilize different pre-programmed I2C addresses. The device is designed specifically for applications requiring high reliability under isolating overlay materials.

Replacement Considerations

SX9513EWLTRT: Lacks proximity sensing functionality but shares the same package and pinout.

FAQ

How does the SX9512 handle multiple simultaneous button touches?

The device supports Single-mode reporting, which reports only the first touched button until released, and Strongest-mode reporting, which prioritizes the button with the highest capacitance change.

What is the maximum offset compensation range for the capacitive sensors?

The capacitive offset compensation range extends up to 40pF, allowing for significant parasitic capacitance from PCB traces and overlays.

Can the device operate without an I2C connection after configuration?

Yes, parameters can be stored in the internal Non-Volatile Memory (NVM), enabling autonomous operation using analog outputs or interrupt signals without continuous I2C traffic.