IQS7225A

The IQS7225A ProxFusion® IC is a sensor fusion device that is mainly aimed at inductive sensing applications that require relative rotational inductive sensing and/or multiple inductive buttons. The device also has capacitive sensing capabilities that can be used to complement the inductive sensing applications, e.g. a capacitive wakeup channel. The sensor is fully I2C compatible and on-chip calculations enable the IC to respond effectively even in its lowest power modes.

OVERVIEW

Main Features

Highly flexible ProxFusion® device
9 (QFN) external sensor pad connections
Configure up to 6 channels using the external connections
External inductive sensor options:
- Up to 6x self-capacitive buttons
- Up to 6x mutual-capacitive buttons
- Up to 6x inductive buttons
Built-in basic functions:
- Gray-coded relative rotational encoder
- Selectable channel reference
  - LTA as reference
  - select channel to use as reference
  - Fixed value as reference
- Blocking channel
- Automatic Tuning Implementation (ATI)
- Noise filtering
- Debounce & hysteresis
- Dual direction trigger indication
Built-in signal processing options:
- Rotational encoder angle
- Rotational encoder counter
- Rotational encoder state
- PC software for debugging and obtaining optimal settings and performance
- Auto-run from programmed settings for simplified integration
Multi-level trigger implementation:
- Adjustable number of trigger levels
- Trigger event states
Design simplicity
Automated system power modes for optimal response vs consumption
I2C communication interface with IRQ/RDY (up to fast plus – 1 MHz)
I2C address selection using GPIO pin
Event and streaming modes
Customizable user interface due to programmable memory
Supply voltage range:
- 1.8 V to 3.5V (FOSC = 14 MHz)
- 2.2 V to 3.5V (FOSC = 18 MHz)
Small packages
- QFN20 (3 x 3 x 0.5 mm) – 0.4mm pitch