IQS228B00000000TSR

Overview

The IQS228B00000000TSR is a single-channel self-capacitive proximity and touch sensor controller from Azoteq's ProxSense series. It operates on a supply voltage of 1.8 V to 3.6 V with a low power consumption of 2.5 µA in low power mode. The device features Dynamic Calibration (DYCAL™) for drift compensation during prolonged activation, Automatic Tuning Implementation (ATI), and supports both 1-Wire data streaming and I2C debug interfaces. It is available in TSOT-23-6, DFN-6, and WLCSP-8 packages, operating within a temperature range of -40°C to +85°C.

Feature Summary

• Intelligent hysteresis via DYCAL™ technology tracks environmental drift during extended touch states.
• Supports automatic tuning implementation (ATI) to calibrate the sense electrode without manual adjustment.
• Offers flexible communication options including 1-Wire open-drain streaming and I2C for debugging.
• Configurable output logic allows selection between active high push-pull or active low open-drain modes.

Applications

• On-ear detection for mobile phones
• Proximity sensors for personal media players
• Human interface devices requiring touch feedback
• SAR detection systems for tablets
• Proximity activated backlighting for white goods

Procurement Notes

Verify the specific ordering suffix against the manufacturer's configuration tool to ensure correct OTP programming. Confirm package availability matches design requirements. Check RoHS compliance status before integration. Ensure ESD protection measures are implemented on the Cx pin as recommended in the reference schematic.

Selection Notes

Select this component for applications requiring single-channel capacitive sensing with minimal external components. Consider the IQS228D variant if the system supply voltage exceeds 3.6 V. Evaluate the required package type based on PCB space constraints. Verify that the host microcontroller supports the selected communication protocol for configuration and data retrieval.

Part Context

This part belongs to the IQ Switch ProxSense family, designed for low-power capacitive sensing. It complements multi-channel controllers by providing a cost-effective solution for simple proximity and touch detection tasks. The series emphasizes ease of integration through automatic tuning and configurable user options stored in one-time programmable memory.

Replacement Considerations

Direct substitutes include other IQS228 variants with different package markings or pre-configured OTP settings. Cross-referencing with IQS227 models may be necessary for similar functionality but with different channel counts or feature sets. Always verify pin compatibility and electrical specifications before substitution.