IQS228B00000000CSR

Overview

The IQS228B00000000CSR is a single-channel self-capacitive proximity and touch sensor IC from the Azoteq ProxSense series. It operates on a supply voltage range of 1.8 V to 3.6 V and features an integrated internal voltage regulator and reference capacitor. The device utilizes Dynamic Calibration (DYCAL) technology to maintain sensitivity during prolonged activation, tracking environmental drift while in a touch state. Communication is facilitated via an I2C interface for debugging and configuration. It is housed in a WLCSP-8 package and supports operation across a temperature range of -40°C to +85°C.

Feature Summary

• Intelligent hysteresis algorithm (DYCAL) that tracks slow environmental changes during extended touch events
• Automatic Tuning Implementation (ATI) for calibration to sense electrode variations
• Configurable output logic with selectable sink or source modes
• Supports both 1-Wire data streaming and I2C debug interfaces

Applications

• On-ear detection for mobile phones
• Proximity sensors for personal media players
• Human Interface Devices (HID)
• SAR detection for tablets
• Proximity activated backlighting

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm pinout compatibility and OTP configuration settings. Ensure the WLCSP-8 package dimensions align with the target PCB footprint. Confirm RoHS compliance status through official documentation prior to final procurement approval.

Selection Notes

Select this component for applications requiring a single-channel capacitive solution with robust drift compensation. The IQS228B variant is suitable for systems operating between 1.8 V and 3.6 V. Consider the WLCSP-8 package for space-constrained designs. Verify that the required I2C address and streaming protocols match the system controller capabilities.

Part Context

This part belongs to the IQ Switch ProxSense family, designed for low-power capacitive sensing. The IQS228B specifically targets lower voltage applications compared to the IQS228D. It shares core sensing algorithms with other members of the series but differs in supply voltage requirements and available package options.

Replacement Considerations

Direct replacements within the same family include the IQS228D for higher voltage applications (2.4 V to 5.5 V). Alternative packages such as TSOT-23-6 or DFN-6 are available under different ordering suffixes (e.g., IQS228BxxxxxxTSR or DNR), provided the pinout remains compatible.