SX9300
Ultra Low Power, Dual Channel
Smart Proximity SAR Compliant Solution
WIRELESS & SENSING PRODUCTS
Datasheet
G
ENERAL
D
ESCRIPTION
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.
K
EY
P
RODUCT
F
EATURES
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
A
PPLICATIONS
•
•
•
•
•
SAR Compliant Systems
Notebooks
Tablets
Mobile Phones
Mobile Hot Spots
O
RDERING
I
NFORMATION
Semtech P/N
SX9300IULTRT
Note1
Package
QFN-20
Eval. Kit
Marking
ZM5C
SX9300EVK
Note 1: Quantities are ordered in 3K units per Reel
T
YPICAL
A
PPLICATION CIRCUIT
Revision 1.8
June 27, 2012
© 2012 Semtech Corporation
1
www.semtech.com
SX9300
Ultra Low Power, Dual Channel
Smart Proximity SAR Compliant Solution
WIRELESS & SENSING PRODUCTS
Datasheet
Table of Contents
G
ENERAL
D
ESCRIPTION
........................................................................................................................ 1
K
EY
P
RODUCT
F
EATURES
..................................................................................................................... 1
A
PPLICATIONS
....................................................................................................................................... 1
O
RDERING
I
NFORMATION
...................................................................................................................... 1
T
YPICAL
A
PPLICATION CIRCUIT
............................................................................................................ 1
1
1.1
1.2
1.3
1.4
G
ENERAL
D
ESCRIPTION
............................................................................................................... 5
Pin Diagram
Marking information
Pin Identification
Acronyms
Absolute Maximum Ratings
Recommended Operating Conditions
Thermal Characteristics
5
5
6
6
7
7
7
11
11
11
11
11
12
12
13
13
13
14
14
15
15
15
16
16
16
16
16
16
17
17
18
18
18
18
19
19
2
2.1
2.2
2.3
E
LECTRICAL
C
HARACTERISTICS
................................................................................................. 7
3
3.1
F
UNCTIONAL DESCRIPTION
........................................................................................................ 11
Introduction
3.1.1
General
3.1.2
Parameters and Configuration
3.1.3
Sensor Proximity Adjustment
3.2
Scan Period
3.3
Operational Modes
3.4
I2C interface
3.5
Configuration
3.6
Reset
3.6.1
Power-up
3.6.2
NRST
3.6.3
Software Reset
3.7
Interrupt
3.7.1
Power-up
3.7.2
NIRQ Clearing
4
4.1
4.2
4.3
4.4
4.5
P
IN DESCRIPTIONS
..................................................................................................................... 16
Introduction
V
DD
and SV
DD
TXEN
Capacitor Sensing Interface (CS0A, CS0B, CS1A, CS1B, CSG)
Host Interface
4.5.1
NIRQ
4.5.2
SCL, NRST and TXEN
4.5.3
SDA
Specific Absorption Rate (SAR) Basics
SAR Solution
5.2.1
Set CPS_DEB [5:4] (Debounce)
5.2.2
Set CPS_DELTATRS [3:0] (SAR Delta Detection Threshold)
5.2.3
Set CPS_RATIOTRS [7:0] (SAR Ratio Detection Threshold)
5.2.4
Setting Up The SX9300 To Discriminate Between A Human Body & Inanimate Object
June 27, 2012
© 2012 Semtech Corporation
2
5
5.1
5.2
D
IFFERENTIAL DETECTION AND
SAR
COMPLIANCE
.................................................................. 18
Revision 1.8
www.semtech.com
SX9300
Ultra Low Power, Dual Channel
Smart Proximity SAR Compliant Solution
WIRELESS & SENSING PRODUCTS
Datasheet
6
6.1
6.2
D
ETAILED
C
ONFIGURATION DESCRIPTIONS
.............................................................................. 20
Introduction
Capacitive Sensor (CS0A, CS0B, CS1A, CS1B) Parameters
6.2.1
Set CPS_Digital_GAIN [6:5] (Cap Sensor Gain)
6.2.2
Set CPS_C
IN
R [1:0] (Input Capacitance Range and Resolution)
6.2.3
Set CPS_TRS [4:0] (Detection threshold)
6.2.4
Set CPS_HYST [5:4] (Detection Hysteresis)
6.2.5
Set CPS_AVGDEB[7:6] (Average Pos/Neg Debouncing)
6.2.6
Set CPS_AVGNEGFILT[5:3] & CPS_AVGPOSFILT[2:0] (Average Neg/Pos Filters)
6.2.7
Set CPS_FS[4:3] (Sampling Frequency)
6.2.8
Set CPS_RES[2:0] (Resolution Factor)
6.2.9
Set CPS_AVGTRS[7:0] (Averaging Threshold)
6.3
Additional Parameter Settings
6.3.1
Set CPS_PERIOD[6:4] (Scan Period)
6.3.2
Set CPS_EN [3:0] (Enable Capacitive Sensor Inputs)
6.3.3
Set IRQ_Enable [6:3] (Enable Interrupt Sources)
20
20
20
20
21
22
22
22
23
23
23
24
24
24
24
25
26
27
31
32
33
7
7.1
7.2
7.3
7.4
I2C I
NTERFACE
........................................................................................................................... 25
I2C Write
I2C Read
Register Overview
SAR Sensor Design
Package Outline Drawing
Land Pattern
8
8.1
8.2
P
ACKAGING
I
NFORMATION
........................................................................................................ 32
LIST OF FIGURES
Figure 1: Pin Diagram
.............................................................................................................................................5
Figure 2: QFN Marking Information
.......................................................................................................................5
Figure 3: I2C Start and Stop timing
.....................................................................................................................10
Figure 4: I2C Data timing
......................................................................................................................................10
Figure 5 Scan Period.............................................................................................................................................
11
Figure 6: Power-up vs. NIRQ
................................................................................................................................13
Figure 7: Hardware Reset
.....................................................................................................................................14
Figure 8: Software Reset
......................................................................................................................................14
Figure 9: NIRQ Output Simplified Diagram
........................................................................................................16
Figure 10: SCL/TXEN/NRST
.................................................................................................................................17
Figure 11: SDA Simplified Diagram
.....................................................................................................................17
Figure 12: I2C Write...............................................................................................................................................
25
Figure 13: I2C Read
...............................................................................................................................................26
Figure 14: Typical SAR Capacitive Sensor
.........................................................................................................31
Figure 15: Package Outline Drawing
...................................................................................................................32
Figure 16: Package Land Pattern
........................................................................................................................33
Revision 1.8
June 27, 2012
© 2012 Semtech Corporation
3
www.semtech.com
SX9300
Ultra Low Power, Dual Channel
Smart Proximity SAR Compliant Solution
WIRELESS & SENSING PRODUCTS
Datasheet
LIST OF TABLES
Table 1: Pin Description
.........................................................................................................................................6
Table 2: Absolute Maximum Ratings
....................................................................................................................7
Table 3: Recommended Operating Conditions
....................................................................................................7
Table 4: Thermal Characteristics
...........................................................................................................................7
Table 5: Electrical Characteristics
.........................................................................................................................9
Table 6: I2C Timing Specification
........................................................................................................................10
Table 7: I2C Sub-Address Selection....................................................................................................................
12
Table 8: Detection Debounce Control
.................................................................................................................18
Table 9: Delta Threshold Selection
.....................................................................................................................18
Table 10: CPS_Digital_GAIN
................................................................................................................................20
Table 11: C
INPUT
Range and Resolution Register
...............................................................................................20
Table 12: Cap Sensor Threshold
.........................................................................................................................21
Table 13: CPS_HYST
.............................................................................................................................................22
Table 14: CPS_AVGDEB
.......................................................................................................................................22
Table 15: Sampling Frequency Control
..............................................................................................................23
Table 16: CPS Resolution Factor
.........................................................................................................................23
Table 17: Scan Period
...........................................................................................................................................24
Table 18: Register Overview
................................................................................................................................30
Revision 1.8
June 27, 2012
© 2012 Semtech Corporation
4
www.semtech.com
SX9300
Ultra Low Power, Dual Channel
Smart Proximity SAR Compliant Solution
WIRELESS & SENSING PRODUCTS
Datasheet
1 G
ENERAL
D
ESCRIPTION
1.1
Pin Diagram
Figure 1: Pin Diagram
1.2
Marking information
ZM5C
yyww
xxxx
yyww= Date Code
xxxx = Lot Number
Figure 2: QFN Marking Information
Revision 1.8
June 27, 2012
© 2012 Semtech Corporation
5
www.semtech.com
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