IQS227D00400008DNR

Overview

The IQS227D00400008DNR is a single-channel capacitive proximity and touch controller from the ProxSense series. It operates on a supply voltage range of 2.4 V to 5.5 V with a typical current consumption of 5 µA in low power mode. The device features an internal voltage regulator and reference capacitor, utilizing a charge transfer method for sensing. It provides dedicated outputs for proximity (POUT) and touch (TOUT) events, supporting I2C data streaming. Configuration is managed via One Time Programmable (OTP) options, allowing customization of power modes, output logic, and sensitivity thresholds.

Feature Summary

• Automatic Tuning Implementation (ATI) for self-calibration of sense electrodes
• Dual digital outputs for independent proximity and touch event signaling
• Configurable output modes including active, latch, and toggle states
• Supports I2C data streaming for direct host interface communication

Applications

• On-ear detection and touch keys for GSM cellular telephones
• Proximity detection for LCD, Plasma, and LED TV backlighting activation
• Wake-up triggers for standby applications in office equipment
• Find-In-The-Dark (FITD) functionality for automotive door pocket lighting

Procurement Notes

Verify the specific ordering suffix against the manufacturer's configuration tool to ensure correct OTP programming. Confirm package availability matches design requirements, as the IQS227D variant is restricted to DFN-6 or TSOT23-6 packages. Ensure supply voltage constraints align with the 2.4 V to 5.5 V operational range specified for the 'D' series.

Selection Notes

Select this model over the IQS227B variant when system power rails exceed 3.6 V, as the IQS227D supports up to 5.5 V. Consider the DFN-6 or TSOT23-6 package options available for this specific part number. Evaluate the need for I2C streaming versus standard GPIO outputs based on host processor capabilities and software complexity requirements.

Part Context

This component belongs to the Azoteq IQS227 family of single-channel capacitive sensors. It shares core architecture with the IQS227B but differs in operating voltage specifications. The 'D' designation indicates compatibility with higher voltage supplies, distinguishing it from the lower voltage 'B' series within the same ProxSense product line.

Replacement Considerations

Direct functional replacements include other IQS227D variants with different OTP configurations. Cross-family substitution requires careful evaluation of pinout compatibility and voltage level shifts between IQS227 and IQS127 series devices.