IS31SE5104-GRLS2-TR

Sensor And Detector Interfaces Overview

The IS31SE5104-GRLS2-TR is a low-power, fully integrated capacitive touch sensor controller featuring four independent sensing channels. It operates within a supply voltage range of 2.7V to 5.5V and supports an industrial temperature range from -40°C to +85°C. The device utilizes a 400kHz I²C serial interface for communication and includes on-chip auto-calibration logic to continuously monitor environmental changes and adjust thresholds. Key electrical parameters include a quiescent current of 173μA (typical) at 3.6V and a shutdown current of 1.6μA (typical). The component provides open-drain outputs and an active-low interrupt signal upon button events.

Sensor And Detector Interfaces Feature Summary

• Integrated auto-calibration logic that continuously monitors the environment and automatically adjusts threshold levels to prevent false activation caused by humidity or temperature variations.
• Supports adjustable sensitivity via external capacitors or internal register configuration, allowing optimization for different dielectric materials such as glass or plastic.
• Features an active-low interrupt output pin that notifies the host microcontroller immediately when a touch or release event is detected on any channel.

Sensor And Detector Interfaces Applications

• Mobile phones
• GPS devices
• PDAs

Sensor And Detector Interfaces Procurement Notes

Verify the specific package type required for the design, as the base model IS31SE5104 is available in both QFN-16 and SOP-16 configurations. The suffix GRLS2 indicates the SOP-16 package variant. Confirm that the ordering suffix aligns with the intended manufacturing process and packaging quantity requirements before finalizing procurement orders.

Sensor And Detector Interfaces Selection Notes

Select this component for portable applications requiring ultra-low power consumption and robust capacitive touch detection through thick dielectrics. Ensure the system design accommodates the 2.7V to 5.5V operating voltage range and integrates a 400kHz I²C master controller. Consider the 8kV ESD HBM rating for environments requiring high electrostatic discharge protection.

Sensor And Detector Interfaces Part Context

This component belongs to the Lumissil Microsystems IS31SE series of capacitive touch controllers. It is designed specifically for button-based interfaces in compact electronic devices. The series focuses on providing integrated calibration and low power operation to extend battery life in portable consumer electronics without compromising detection reliability.

Sensor And Detector Interfaces Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult official manufacturer resources for cross-reference data or verify compatibility with alternative capacitive touch controllers based on specific interface and pinout requirements.

Sensor And Detector Interfaces FAQ

How does the IS31SE5104 handle environmental capacitance changes?

The device integrates auto-calibration logic that performs a cycle every two seconds to update reference capacitance values. This neutralizes slow changes due to dirt, humidity, or temperature, preventing false triggers while still detecting valid user inputs.

What is the function of the AD pin?

The AD pin is used to set the lower bits of the 7-bit I²C slave address. Its state can be connected to GND, VCC, SCL, or SDA to configure unique addresses for multiple devices on the same bus.

How is the interrupt signal cleared?

The INTB pin returns to a high state once the MCU accesses State Register 2 (03h) via the I²C bus. Alternatively, the Interrupt Register (04h) can be configured to automatically clear the interrupt after 8ms or 32ms.