IQS231B00000000CSR

Overview

The IQS231B00000000CSR is a single-channel self-capacitance controller from the Azoteq ProxSense series, designed for SAR applications. It operates on a supply voltage range of 1.764V to 3.6V and features an I2C interface alongside standalone GPIO output options. The device utilizes charge-transfer technology with capacitive resolution down to 0.02fF and supports loads up to 120pF. Configuration is managed via One-Time Programmable (OTP) bits or I2C commands. It includes advanced movement detection, quick release sensitivity, and temperature compensation. The component is housed in a TSOT-23-6 package and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrated SAR user interface with simple GPIO output and failsafe heartbeat pulses
• Quick release detection to prevent false triggers from remaining proximity states
• Advanced temperature and interference compensation for high power RF environments
• Configurable sampling rates including low power modes and synchronization capabilities

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to ensure correct packaging and temperature grade. Confirm that the requested part number matches the exact hardware revision required for your design, as hardware variants may exist within the same family despite identical firmware.

Selection Notes

Select this model when a single-channel solution with improved low-temperature performance is required compared to the IQS231A variant. Ensure the application benefits from the integrated LDO regulator and minimal external component count. Verify that the TSOT-23-6 package fits the PCB layout constraints and that the I2C address configuration aligns with the system bus requirements.

Part Context

This component belongs to the IQ Switch ProxSense series by Azoteq. It shares identical firmware with the IQS231A but offers distinct hardware improvements, specifically enhanced temperature response and extended low-temperature operation ranges. It serves as a specialized controller for proximity and touch sensing in mobile and wearable devices requiring SAR compliance.

Replacement Considerations

The IQS231A is the primary alternative within the same series, sharing identical firmware but differing in hardware temperature characteristics. Other ProxSense devices in the TSOT-23-6 package are pin-compatible, though functional differences exist.