IQS211A-00000000-TSR

Overview

The IQS211A-00000000-TSR is a single-channel capacitive proximity and touch controller from Azoteq's ProxSense series, designed for applications requiring long-term detection via movement sensing. It operates on a supply voltage of 1.8V to 3.6V and features an ultra-low power consumption profile, ranging from sub-2µA in low-power standby modes to 80µA at 50Hz response. The device supports I2C communication, standalone direct outputs, and a 1-Wire streaming interface. It utilizes Automatic Tuning Implementation (ATI) for calibration and offers configurable One-Time Programmable (OTP) settings for sensitivity, thresholds, and user interfaces.

Feature Summary

• Integrated on-chip movement detection algorithm that forces activation upon detecting motion, enabling long-term presence tracking without continuous high-power scanning.
• Configurable dual digital output pins supporting multiple user interface modes, including Activation & Movement, Movement Latch, and Proximity & Touch configurations.
• Automatic Tuning Implementation (ATI) ensures robust performance across varying environmental conditions and sensor capacitances without manual calibration adjustments.
• Supports flexible communication protocols including standard I2C polling, I2C with RDY interrupt, standalone mode, and a 1-Wire data streaming interface for debugging.

Applications

• Wearable devices requiring wake-up on proximity or touch
• Movement detection systems such as fitness trackers and anti-theft alarms
• White goods and home appliances with long-term activation needs
• Human Interface Devices (HID) and proximity-activated backlighting

Procurement Notes

Verify the specific ordering suffix and OTP configuration prior to purchase, as the IQS211A allows for pre-programmed factory settings. Confirm package availability and lead times with authorized distributors, noting that this component may be subject to end-of-life notifications or discontinuation. Ensure compatibility with existing I2C addresses and pinout requirements during the sourcing phase.

Selection Notes

Select the IQS211A when a single-channel solution with integrated movement detection is required for battery-operated devices. Consider the TSOT23-6 package constraints and verify that the 1.8V to 3.6V supply range matches the system design. Evaluate the need for specific OTP configurations versus runtime I2C programming based on production volume and flexibility requirements.

Part Context

The IQS211A belongs to Azoteq's ProxSense family of capacitive sensors, which are optimized for low-power proximity and touch applications. It is pin-compatible with other models in the series, such as the IQS127D, IQS128, IQS227AS, IQS228AS, and IQS231A, facilitating potential upgrades or replacements within existing designs that utilize these legacy components.

Replacement Considerations

The IQS211A is pin-compatible with the IQS127D, IQS128, IQS227AS, IQS228AS, and IQS231A. When substituting these parts, verify that the target application does not rely on features unique to the legacy part that are absent in the IQS211A, such as specific channel counts or different output drive capabilities.