Features
• 2.7-3.6V Input Supply Voltage
• Up to 5 High Performance Capacitive Sensor Inputs
 Patented On-Chip Smart Engine For SAR
 Capacitance Resolution down to 1aF
 Capacitance Offset Compensation up to 220pF
 Multiple thresholds per sensing input
 Separate configurations per input
• Automatic Calibration
• Ultra-Low Power Consumption
 Active Mode: 27 uA
 Doze Mode: 7 uA
 Sleep Mode: 1.1 uA
• I2C Serial Interface
 2 Sub-Addresses Selectable by Pin
• Programmable Interrupt or Real-Time Status Pin
• -40°C to +85°C Operation
• Compact Size Package
 1.80 x 2.10 mm DFN
• Pb & Halogen Free, RoHS/WEEE compliant

Applications
• Mobile Phones
• Tablets
• Note books
• Wearables
• Industrial

Description
The SX9331 is a 5 channel smart capacitive proximity sensor for SAR (Specific Absorption Rate) as well as other demanding proximity and touch applications.
The SX9331 has a unique Smart Engine that is able to accurately discriminate between an inanimate object and human body which can be used to enhance SAR applications. The resulting detection is used in portable electronic devices to reduce and control radio-frequency (RF) emission power in the presence of a human body, enabling significant performance advantages for manufacturers of electronic devices with electro-magnetic radiation sources to meet stringent emission regulations' criteria and Specific Absorption Rate (SAR) standards.
Operating directly from an input supply voltage of 2.7-3.6V, the SX9331 outputs its data via I2C serial bus. The I2C serial communication bus port is compatible with 1.8V host control to report body detection/proximity and to facilitate parameter settings adjustment. Upon proximity detection, the NIRQ output asserts, enabling the user to either determine the relative proximity distance, or simply obtain an indication of detection.
The SX9331 includes an on-chip auto-calibration controller that regularly performs sensitivity adjustments to maintain peak performance over a wide variation of temperature, humidity and noise environments, providing simplified product development and enhanced performance.