IQS231A-00004000-TSR

Overview

The IQS231A-00004000-TSR is a single-channel self-capacitance controller designed for SAR applications requiring proximity detection. It operates on a supply voltage of 1.764V to 3.6V and features an I2C interface with configurable OTP settings. The device supports standalone or I2C modes, offering quick release detection and movement sensing. It utilizes charge-transfer technology with capacitive resolution down to 0.02fF and handles loads up to 120pF. Sampling rates include 30Hz, 100Hz, 8Hz, and 4Hz. The component is housed in a TSOT-23-6 package.

Feature Summary

• Integrated SAR user interface providing simple GPIO output
• Quick release detection to prevent false triggers from remaining objects
• Advanced temperature and interference compensation options
• Standalone failsafe mode with heartbeat pulses

Applications

• SAR sensor integration
• On-ear detection
• Hold detection for screen activation
• Movement sensing applications

Procurement Notes

Verify the specific ordering suffix against the manufacturer's datasheet to confirm pinout compatibility and OTP configuration. Ensure the selected variant matches the required operating temperature range and package type for your design. Cross-reference the part number with official distributor catalogs to validate current availability and lead times before finalizing procurement plans.

Selection Notes

Select this component when a single-channel proximity solution with low power consumption is required. Consider the IQS231B variant if improved temperature response or extended low-temperature operation is necessary. Evaluate the need for I2C configurability versus standalone simplicity based on system requirements. Ensure external components meet the recommended capacitor values to prevent ESD latch-up issues.

Part Context

This part belongs to the Azoteq ProxSense series, specifically engineered for mobile devices and wearables. It serves as a drop-in replacement for older touch controllers like the IQS229 or IQS128 in compatible designs. The series emphasizes safety compliance and robust performance in high RF environments.

Replacement Considerations

The IQS231B offers identical firmware with improved hardware for temperature response. Verify pin compatibility with existing TSOT-23-6 footprints when substituting. No other direct substitutes are documented in the provided source material.