IQS7211A101CSR

Overview

The IQS7211A101CSR is a capacitive touch and proximity trackpad controller from Azoteq's ProxSense series, housed in a WLCSP-18 package measuring 1.62 x 1.62 x 0.5 mm. It supports up to 10 external sensor pad connections with an I2C interface operating at frequencies up to 1 MHz. The device functions within a supply voltage range of 1.71 V to 3.5 V and operates reliably across temperatures from -40°C to +85°C. Key capabilities include automatic tuning, two-finger tracking, gesture recognition, and ultra-low power wake-up modes.

Feature Summary

• Supports flexible self-capacitive and mutual-capacitive sensor configurations for display wake-up
• Features integrated single-finger gesture recognition engine and two-finger tracking
• Includes automatic tuning and on-chip noise filtering for optimized sensitivity
• Provides low-power proximity detection enabling extreme energy efficiency

Applications

• Fitness bands
• True Wireless Stereo (TWS) earbuds
• Game controller touch pads
• Headphones

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and pre-programmed settings. Ensure compatibility with system voltage requirements and I2C bus specifications before integration. Confirm moisture sensitivity levels and reflow soldering profiles align with manufacturing processes.

Selection Notes

Select this component when a compact footprint is required for trackpad applications. The WLCSP-18 package limits external connections to ten pads compared to other variants. Verify that the application requires support for up to two fingers and standard gesture inputs. Check if the design benefits from the specific auto-tuning features provided by this ProxSense implementation.

Part Context

This part belongs to the IQS7211A family, which includes QFN20 variants like the IQS7211A101QNR. The CSR suffix indicates the WLCSP-18 packaging option. Other family members may offer different pin counts or pre-programmed configurations. The datasheet provides detailed electrical characteristics and layout guidelines for these related components.

Replacement Considerations

The IQS7211A101QNR serves as a functional alternative using a QFN20 package. Substitution requires adapting the PCB footprint and verifying pin-to-pin compatibility for power and signal lines. Electrical parameters remain consistent, but physical dimensions differ significantly between the CSP and QFN formats.