IS31SE5104-QFLS2-TR

Sensor And Detector Interfaces Overview

The IS31SE5104-QFLS2-TR is a low-power, fully integrated four-channel capacitive touch sensor controller manufactured by Lumissil Microsystems. It operates within a supply voltage range of 2.7V to 5.5V and supports an industrial temperature range of -40°C to +85°C. The device features auto-calibration logic that continuously monitors the environment to adjust threshold levels, preventing false activations due to environmental changes. It communicates via a 400kHz I²C serial bus with a field-programmable slave address. An active-low interrupt signal (INTB) is generated upon button events. The component is available in QFN-16 (3mm × 3mm) and SOP-16 packages, with the specified model utilizing the QFN-16 package.

Sensor And Detector Interfaces Feature Summary

• Integrates auto offset compensation and calibration logic to neutralize slow environmental capacitance changes.
• Supports sensitivity adjustment through external capacitors or internal register configuration.
• Features an open-drain output structure for driving LEDs or generating logic signals.
• Includes hardware shutdown capability to minimize power consumption.

Sensor And Detector Interfaces Applications

• Mobile phones
• GPS devices
• PDAs

Sensor And Detector Interfaces Procurement Notes

Verify the specific ordering suffix matches the required package type. The -QFLS2-TR designation indicates the QFN-16 package variant. Confirm lead-free status and reel quantity specifications against current distributor listings. Ensure the industrial temperature grade aligns with the target application environment requirements before finalizing procurement.

Sensor And Detector Interfaces Selection Notes

Select this component for portable applications requiring low power consumption and reliable touch detection through dielectric materials like glass or plastic. Consider the QFN-16 package for compact designs. Evaluate the need for interrupt-driven versus polling-based MCU interaction based on system architecture. Verify ESD protection requirements against the 8kV HBM rating provided in the datasheet.

Sensor And Detector Interfaces Part Context

This part belongs to the IS31SE5104 series of capacitive touch sensors from Lumissil Microsystems. The series provides solutions for multi-button interfaces with integrated calibration. The specific suffix denotes the QFN-16 package and tape-and-reel packaging format, distinguishing it from the SOP-16 tube variant.

Sensor And Detector Interfaces Replacement Considerations

The SOP-16 version (IS31SE5104-GRLS2) offers identical electrical functionality but differs in physical package dimensions and mounting style. Designers must verify footprint compatibility when substituting between QFN-16 and SOP-16 variants.

Sensor And Detector Interfaces FAQ

How does the IS31SE5104 handle environmental capacitance changes?

The device integrates auto-calibration logic that updates reference capacitance registers every two seconds to compensate for slow environmental changes such as dirt, humidity, or temperature variations.

What is the function of the AD pin?

The AD pin is used to set the I²C slave address bits A1 and A2. It can be connected to GND, VCC, SCL, or SDA to configure unique addresses on the bus.

How is the interrupt signal cleared?

The INTB pin returns high once the MCU accesses State Register 2 (03h). Alternatively, the ACI bit in Interrupt Register (04h) can be configured to automatically clear the interrupt after 8ms or 32ms.