IQS7225A101QNR

Overview

The IQS7225A101QNR is a sensor fusion IC from the ProxFusion series, designed for inductive sensing applications requiring relative encoder functionality and multiple buttons. It supports self-capacitance, mutual-capacitance, and inductive modes via six configurable channels using nine external sensor pad connections. The device features an I2C interface with IRQ/RDY support up to 1 MHz, selectable I2C addresses (0x44/0x45), and Gray-coded relative encoder processing. Operating voltages range from 1.8 V to 3.5 V at 14 MHz or 2.2 V to 3.5 V at 18 MHz. It includes Automatic Tuning Implementation (ATI), multi-level triggers, and low-power modes including Ultra-Low Power (ULP). The component is housed in a QFN20 package measuring 3 x 3 x 0.5 mm.

Feature Summary

• Supports flexible sensor configurations including inductive coils, self-capacitive buttons, and mutual-capacitive buttons.
• Integrates built-in signal processing for encoder angle, counter, and state alongside proximity and touch detection.
• Features Automatic Tuning Implementation (ATI) and Automatic Re-ATI for stable performance across varying environmental conditions.
• Provides customizable user interfaces through programmable memory maps and adjustable trigger levels.

Applications

• Waterproof inductive dial and counter applications
• Integrated control panels combining dials and buttons
• White goods user interfaces
• Smart home controllers

Procurement Notes

Verify the specific ordering suffix 'QNR' corresponds to the QFN20 package variant with exposed thermal pads connected to ground. Confirm that the '101' suffix indicates the 14 MHz oscillator frequency configuration as distinct from other variants. Ensure compatibility with the required I2C address selection hardware setup before finalizing procurement specifications.

Selection Notes

Select this model when inductive sensing with relative encoder capabilities is required alongside capacitive button inputs. The 14 MHz clock option suits designs prioritizing lower power consumption over maximum sampling rates. Verify that the system voltage meets the minimum operating requirements for the selected clock frequency. Consider the QFN20 footprint dimensions for PCB layout constraints.

Part Context

This component belongs to the Azoteq IQS7225A family within the ProxFusion series. It shares core sensing engine architecture with other models in the series but differs in factory-programmed memory map settings and oscillator frequency options. The '101' designation specifically denotes the 14 MHz internal clock configuration, distinguishing it from higher-speed variants.

Replacement Considerations

Direct replacements include other IQS7225A variants such as IQS7225A001QNR, provided the oscillator frequency difference between 14 MHz and 18 MHz is acceptable for the application timing requirements. Cross-family replacement requires significant redesign due to differing channel counts and pinouts.