SX9300 Datasheet, PDF (1/34 Pages) Semtech Corporation – Ultra Low Power, Dual Channel Smart Proximity SAR Compliant Solution

SX9300
Ultra Low Power, Dual Channel
Smart Proximity SAR Compliant Solution
WIRELESS & SENSING PRODUCTS
Datasheet
GENERAL DESCRIPTION
KEY PRODUCT FEATURES
The SX9300 is the world’s first dual channel 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 EMF 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
SX9300 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 serial bus can also
serve to overwrite detection thresholds and operational
settings in the event the user wants to change them from
their factory presets.
The SX9300 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. A
dedicated transmit enable (TXEN) pin is available to
synchronize proximity measurements to RF transmission,
enabling very low supply current and high noise immunity
by only measuring proximity when requested.
2.7 – 5.5V Input Supply Voltage
Dual SAR Capacitive Sensor Inputs
On-Chip SAR Engine For Body versus Inanimate Object
Detection
Stable Proximity Sensing With Temperature
20mm detection distance
Capacitance Offset Compensation to 30pF
Active Sensor Guarding
Automatic Calibration
Ultra Low Power Consumption:
Active Mode:
Doze Mode:
Sleep Mode:
170 uA
18 uA
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
Three (3) Reset Sources: POR, NRST pin, Soft
Reset
-40°C to +85°C Operation
Compact Size: 3 x 3mm Thin QFN package
Pb & Halogen Free, RoHS/WEEE compliant
APPLICATIONS
• SAR Compliant Systems
• Notebooks
• Tablets
• Mobile Phones
• Mobile Hot Spots
ORDERING INFORMATION
TYPICAL APPLICATION CIRCUIT
Semtech P/N
SX9300IULTRT ^Note1
Package
QFN-20
SX9300EVK
Eval. Kit
Note 1: Quantities are ordered in 3K units per Reel
Marking
ZM5C
Revision 1.8 June 27, 2012
© 2012 Semtech Corporation
1
www.semtech.com