WIRELESS & SENSING
Revision 5 Oct 30, 2014 © 2014 Semtech Corporation www.semtech.com
1
SX9306
Ultra Low Power,
Smart Proximity Sensor for SAR
Cap
Sense
and ADC
POR
OSC
AUTO CAL &
CONTROL
CS0
SCL
SDA
VDD
GND
CSG
SENSORS
SX9306
NIRQ
SVDD
A1
CS2
CS3
Smart
Engine
HOST
A0
CS1*
* Internal/not-bonded out
in WLCSP package
NRST*, TXEN*
RF
Shield
GENERAL DESCRIPTION
The SX9306 is an ultra-low power capacitive Specific
Absorption Rate (SAR) controller that accurately
discriminates between an inanimate object and human body
proximity. 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 to
5.5V, the SX9306 outputs its data via a 1.65 – 5.5V host
compatible 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 SX9306 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.
In QFN package, a dedicated transmit enable (TXEN) pin is
available to synchronize capacitive measurements for
applications that require synchronous detection, enabling
very low supply current and high noise immunity by only
measuring proximity when requested.
KEY PRODUCT FEATURES
2.7 – 5.5V Input Supply Voltage
Up to 4 Capacitive Sensor Inputs
Patented On-Chip Smart Engine for Human Detection and
Advanced SAR Control
High Resolution Capacitive Sensing down to 0.08fF
Capacitance Offset Compensation up to 30pF
Configurable Proximity Detection (single/combined)
Integrated High Performance RF Shield for Enhanced
Noise Immunity
Extremely Low Temperature Drift for Stable Measurement
Reduced VDD Ripple Susceptibility
Active Sensor Guarding
Automatic Calibration
Ultra Low Power Consumption:
Active Mode: 170 uA
Doze Mode: 18 uA
Sleep Mode: 2.5 uA
400kHz I2C Serial Interface
Four programmable I2C Sub-Addresses
Input Levels Compatible with 1.8V Host Processors
Open Drain NIRQ Interrupt pin
Up to Three Reset Sources: POR, Soft Reset, NRST
-40°C to +85°C Operation
1.63x1.23 mm WLCSP or 3x3mm Thin QFN package
QFN version pin-to-pin compatible with
SX9300/SX9500
Pb & Halogen Free, RoHS/WEEE compliant
APPLICATIONS
SAR Compliant Systems
Tablets/Phablets
Mobile Phones
Wearable Devices
ORDERING INFORMATION
(1)
Without Backside Coating
(2)
With Backside Coating
TYPICAL APPLICATION CIRCUIT
