GPS Receiver GNS502
Datasheet V01
confidential information preliminary specification
© GNS-GmbH 2014
V 0.1, Oct 6 2014
1
1 INTRODUCTION
The GNS 502 is a ultra small outlined module for
navigation, package tracking and any other applications
where simple, reliable positioning data is a necessity.
Since the chip antenna is already on board, there’ s no
costly implementation work needed. Connecting the 1.8V
power supply, a 32768Hz clock and a serial data
connection is all that has to be done to put GNS502 to
service.
Features
• Improved acquisition performance
• Improved tracking&navigation performance and
minimized error in multi-path environments
• Standard NMEA 0183 output
• Pulse Per Second (PPS) output pin
• GPS fix indication output pin
• Push to Fix pin (P2F) for power management
• Automatic Power Management (APM) feature
• Compact design 15.7*10*2 mm
• Single 1.8 VDC supply
• UART interface
• Fast time to market
• RoHS compliant
Applications
Navigation
o Dynamic Navigation
o Portable (“nomadic”) devices
o Netbooks, tablet PCs and mobile phones
o Low volume applications with short time to market requirement
Timing
o Precision timing via GPS
Location based applications
o GPS Logger
o GPS Tracker
o Security devices
o Camera equipment
GPS Receiver GNS502
Datasheet V01
confidential information preliminary specification
© GNS-GmbH 2014
V 0.1, Oct 6 2014
2
2 INDEX
1 INTRODUCTION ----------------------------------------------------------------------------------------- 1
2 INDEX --------------------------------------------------------------------------------------------------- 2
3 DETAILED FEATURES ----------------------------------------------------------------------------------- 3
3.1 GPS Features --------------------------------------------------------------------------------------------------------------- 3
4 BLOCK DIAGRAM ---------------------------------------------------------------------------------------- 3
5 I/O REQUIREMENTS ------------------------------------------------------------------------------------ 4
5.1 I/O levels ------------------------------------------------------------------------------------------------------------------- 4
6 GPS characteristics ------------------------------------------------------------------------------------- 4
6.1 Automatic Power Management (APM) feature ---------------------------------------------------------------------------- 6
6.2 Push to fix (PTF) ------------------------------------------------------------------------------------------------------------ 6
6.3 Pulse Per Second (PPS) ---------------------------------------------------------------------------------------------------- 7
6.4 Fix Available ---------------------------------------------------------------------------------------------------------------- 7
6.5 GPS Antenna ---------------------------------------------------------------------------------------------------------------- 7
7 ELECTRICAL SPECIFICATION --------------------------------------------------------------------------- 8
7.1 Absolute Maximum Ratings ------------------------------------------------------------------------------------------------ 8
7.2 Recommended Operating Conditions ------------------------------------------------------------------------------------- 8
8 DEVICE PINOUT DIAGRAM ----------------------------------------------------------------------------- 9
9 POWER MANAGEMENT -------------------------------------------------------------------------------- 12
10 HARDWARE HOST INTERFACE ---------------------------------------------------------------------- 12
10.1 GPS UART Interface details ---------------------------------------------------------------------------------------------- 12
11 NMEA DATA ------------------------------------------------------------------------------------------ 13
12 PHYSICAL DIMENSIONS ----------------------------------------------------------------------------- 13
13 RECOMMENDED PAD LAYOUT ----------------------------------------------------------------------- 14
14 DESIGN GUIDELINES -------------------------------------------------------------------------------- 15
14.1 Pcb layout (example: GNS502 EVB) ------------------------------------------------------------------------------------ 15
15 ORDERING INFORMATION -------------------------------------------------------------------------- 17
16 CUSTOMER SPECIFIC FACTORY OPTIONS ---------------------------------------------------------- 19
17 ENVIRONMENTAL INFORMATION ------------------------------------------------------------------- 20
18 DOCUMENT REVISION HISTORY -------------------------------------------------------------------- 20
GPS Receiver GNS502
Datasheet V01
confidential information preliminary specification
© GNS-GmbH 2014
V 0.1, Oct 6 2014
3
3 DETAILED FEATURES
3.1 GPS Features
Significantly improved TTFF at low signal power levels provides the consumer with a
compelling GPS experience
Improved acquisition performance to process position fixes in critical conditions
Reduced power consumption through improvements to RF architecture, software techniques,
receiver core, and RF noise figure partitioning
Improved tracking performance and minimized error in multi-path environments through
increased IF bandwidth and higher sampling rates in tracking channels
Standard NMEA output
1PPS output
GPS Fix indication output pin
APM, Automatic Power Management reduces tracking power down to 40mW average.
4 BLOCK DIAGRAM
Low Noise
Amplifier
SAW Filter
NL5500
RTC Clock
PushToFix
GPS_RESET
UART TX
Fix indicator
PPS output
GPS chip
antenna
TCXO precision
clock
GPS Receiver GNS502
Datasheet V01
confidential information preliminary specification
© GNS-GmbH 2014
V 0.1, Oct 6 2014
4
5 I/O REQUIREMENTS
5.1 I/O levels
GNS502 I/O sections work at 1.8V nominal. Absolute Maximum Ratings should not be exceeded
Should the GNS502 be interfaced to a host with I/O at higher levels, level shifters should be used.
6 GPS characteristics
Parameter
Min
Typ
Max
Unit
Note
general
Frequency
1575.42
MHz
GPS L1 C/A code
Output data frequency
1/60
1
1
1/sec
Configurable
Navigation&tracking
sensitivity
-161
-162
dBm
At LNA input, Note1
Acquisition sensitivity
-145
-146
dBm
autonomous , at LNA input,
Note 1
TTFF hotstart
1
sec
All SVs@-130dBm, Note 1
TTFF hotstart
10
sec
All SVs @-155dBm, Note 1
TTFF autonomous cold start
34
sec
All SVs @-130dBm, Note 1
TTFF autonomous cold start
45
sec
All SVs @-142dBm, Note 1
Number of channels
tracking
16
Number of acquisition
channels
40
Power consumption
GPS ACTIVE (acquisition)
72
83.6
mA
NMEA frequency = 1/sec
GPS ACTIVE (tracking)
50
58.8
mA
NMEA frequency = 1/sec
GPS ACTIVE (tracking)
25
mA
NMEA frequency=1/sec,
-130dBm, APM feature active
GPS shutdown
181
μA
GPS_RESET GND
GPS deep sleep (RTC
running)
81
μA
PTF GND
Note 1: Measured by conductive measurement
GPS Receiver GNS502
Datasheet V01
confidential information preliminary specification
© GNS-GmbH 2014
V 0.1, Oct 6 2014
5
Accuracy
Static position error CEP68
-
2
-
m
Normal open sky in Field
Horizontal position accuracy
using open sky roof-top antenna
Static position error CEP95
-
3
-
m
Normal open sky in Field
Horizontal position accuracy
using open sky roof-top antenna
Static position error CEP68
-
-
2
m
Simulator feed ,
IONO and TROPO errors oN
at -130 dBm power level, Note 1
Static position error CEP95
-
-
3
m
Simulator feed ,
IONO and TROPO errors oN
at -130 dBm power level, Note 1
dynamic position error
CEP68
-
-
3
m
Simulator feed ,
IONO and TROPO errors oN
at -130 dBm power level, Note 1
dynamic position error
CEP95
-
-
4
m
Simulator feed ,
IONO and TROPO errors oN
at -130 dBm power level, Note 1
velocity error CEP68
-
-
0.1
m/s
Simulator feed ,
IONO and TROPO errors oN
at -130 dBm power level, Note 1
velocity error CEP95
-
-
0.7
m/s
Simulator feed ,
IONO and TROPO errors oN
at -130 dBm power level, Note 1
Accuracy for timepulse signal
1PPS pulse duration
-
1
-
msec
1PPS time jitter
-
15
100
nsec
Pulse rising edge deviation from
expected pulse time, measured
in a 300 seconds interval with
full 3D fix @-130dBm, Note 1
1PPS rise and fall time
10
nsec
10%..90%
1PPS output impedance
-
10kΩ//20pF
-
TCXO
TCXO output frequency
-
26.000
-
MHz
±2.5 ppm
TCXO output impedance
-
1MΩ//5pF
-
-
Note 1: Measured by conductive measurement
ITAR limits
Operation altitude
-5,000
-
18,288
m
Operation velocity
-
-
514
m/s
Operation acceleration
-
-
-
m/s2
No limit set
GPS Receiver GNS502
Datasheet V01
confidential information preliminary specification
© GNS-GmbH 2014
V 0.1, Oct 6 2014
6
6.1 Automatic Power Management (APM) feature
GNS502 provides APM feature as as a user selectable option.
APM dynamically controls the GPS internal function blocks to achieve the lowest power consumption
in a gives GPS signal condition. APM will work at full power during acquisition and go down to
80mW in tracking mode and reduce the power further to below 50mW (min 27mW) when satellite
signal is unobstructed in an open sky scenario.
However – same as for any GPS device - the accuracy and stability will be lowered due to
reduced activity of the positioning algorithms. Since working parameters of APM are not
adjustable, a field test is recommended to confirm usability of power saving algorithm.
By default, APM is set to inactive. Please refer to Section 13 for more information.
6.2 Push to fix (PTF)
The PTF signal pin is used to control the power state of the receiver. If PTF is high, the receiver is
under full operation.
When PTF is going to low level, a deep sleep state is entered, only the memory and the real time
clock will be powered to preserve almanach, ephemeris and real time.
Reactivating the receiver by setting PTF to high within a short period of time (up to 2 hours) will
allow the receiver to re-fix within a few seconds or less.
T1 (Boot up) 4.5sec
T2 = TTFF
System
State
GPS_RESET
PUSH_TO_FIX
T1
T2
Reset
Boot up
Aquisition
Tracking
Sleep
GPS Receiver GNS502
Datasheet V01
confidential information preliminary specification
© GNS-GmbH 2014
V 0.1, Oct 6 2014
7
6.3 Pulse Per Second (PPS)
TC6000GN provide a so called Pulse Per Second (PPS) for timing purposes. After calculation of a 3D
postion fix, the PPS signal is accurately aligned to the GPS seconds boundaries. The pulse
generated is approximately 1 millisecond in duration and the repetition rate is 1 second.
More information about the accuracy of the time pluse, please refer to
http://processors.wiki.ti.com/index.php/CC4000_GPS_for_MCU “GPS PPS Timing Application
Note”.
6.4 Fix Available
The FIX AVAILABLE signal is used to indicate the availability of GPS postion information. This is
typically used to drive an LED buffer so that the state of the device can be easily indicated. The
table below lists the various states.
State
Indication
Initial boot up
low
PTF low
low
PTF on and aquisition
Toggling (900ms low and 100ms high)
PTF on and loss of fix
Toggling (900ms low and 100ms high)
PTF on and postion fix
continuously high
6.5 GPS Antenna
GNS502 contains all input circuitry including a high performance chip antenna. This antenna is
finely tuned and provides the best performance at small outline.
When mounting the module, any metal , metalized or (ESD-) coated materials should be avoided !
A plastic (ABS,PC or similar) cover of up to 2mm should be ok in any case.
Please keep an air gap of 2..3mm between antenna surface and cover whenever possible.
T1
T2
T2 = 1sec
T1 = 1ms
GPS Receiver GNS502
Datasheet V01
confidential information preliminary specification
© GNS-GmbH 2014
V 0.1, Oct 6 2014
8
7 ELECTRICAL SPECIFICATION
7.1 Absolute Maximum Ratings
Parameter
Value
Unit
Supply voltage range: VDD
–0.5 to 2.1
V
Input voltage to all other pins
–0.5 to (VDD + 0.5)
V
Operating ambient temperature range
–40 to +85
°C
Storage temperature range
–40 to +85
°C
7.2 Recommended Operating Conditions
Parameter
Min
Typ
Max
Unit
Note
VDD
1.7
1.95
V
Power-supply voltage
High level output voltage VOH
0.8 * VDD
VDD
V
IOUT = 4 mA
Low level output voltage VOL
0
0.2*VDD
V
IOUT = 4 mA
High-level input voltage VIH
0.65x VDD
VDD
V
Low-level input voltage VIL
0
0.35x VDD
V
Operating temperature
-40
85
°C
Full specified performance
GPS Receiver GNS502
Datasheet V01
confidential information preliminary specification
© GNS-GmbH 2014
V 0.1, Oct 6 2014
9
8 DEVICE PINOUT DIAGRAM
TOP VIEW
GN
GPS Receiver GNS502
Datasheet V01
confidential information preliminary specification
© GNS-GmbH 2014
V 0.1, Oct 6 2014
10
F
VBAT
VDD_IO
GPS_UART_TX
GPS_UART_RX
GPS_RESET
RTC_CLK
E
TCXO_CLK
GND
GPS_UART_CTS
NU12
NU10
ON_THE_FLY_PRG
D
DB_1
DB_2
GND1
NU7
NU8
NU9
C
DB_3
DB_4
GND3
NU13
NU11
NU6
B
NU1
NU2
NU3
NU4
NU5
GPS_PPS
A
NU12
GPS_GND1
NU14
GPS_GND2
FIX_AVAILABLE
PUSH_TO_FIX
1
2
3
4
5
6
GPS Receiver GNS502
Datasheet V01
confidential information preliminary specification
© GNS-GmbH 2014
V 0.1, Oct 6 2014
11
(1) I = INPUT; O = OUTPUT; I/O = BIDIRECTIONAL; P = POWER PIN; ANA = ANALOG PIN.
NO
NAME
TYPE1
DESCRIPTION
Power-Management Signals
2F
VDD_IO
P
1.8V I/O power supply voltage
1F
VBAT
P
1.8V main power supply voltage
3D
GND1
P
Common Ground
2E
GND2
P
Common Ground
3C
GND3
P
Common Ground
Clock Signals
1E
TCXO_CLK
O
TCXO_CLK signal output. This Pin delivers the high stable TCXO frequency of 26.000
MHz for external components. Although the output is buffered, do not load this pin
below 20kOhms // 10pF(TBD). Leave open if not used.
6F
RTC_CLK
I
Clock input: 32.768 kHz. Input for an external low frequency clock signal.
A clock must be provided at this pin to operate the module. See chapter "RTC
CONNECTION"
GPS Signals
2A
GPS_GND1
P
GPS RF Ground
4A
GPS_GND2
P
GPS RF Ground
6B
GPS_PPS
O
This output delivers a high-precision pulse-per-second signal that is synchronized to
the GPS time reference. The pulse precision is better than 1*10-7 seconds. Although
the output is buffered, do not load this pin below 10kOhms // 47pF (TBD). Leave open
if not used .
6E
ON_THE_FLY_PRG
I
This input determines operation after reset. Internally pulled up for normal operation.
pull low for re- programming firmware or reconfiguring the module. Leave open in
normal operation.
6A
PUSH_TO_FIX
I
Input signal to switch between operation and deep sleep mode. internally pulled down.
pull high (with less than 4.7kOhm) during operation. pull low (or leave open) to set
the module to deep sleep. Internal RTC continues to work in deep sleep.
5A
FIX_AVAILABLE
O
This pin indicates a fix position.
Leave open if not used.
5F
GPS_RESET
I
Main Reset for the receiver. Internally weak pulled down. Pull high with less than
100kOhm for operation. pull to GND (or leave open) during power – up.
NOT USED PINs DO NOT CONNECT
1A
NU12
do not connect or connect to GND
1B
NU1
do not connect or connect to GND
2B
NU2
do not connect or connect to GND
3B
NU3
do not connect or connect to GND
4B
NU4
do not connect or connect to GND
5B
NU5
do not connect or connect to GND
5E
NU10
do not connect or connect to GND
4D
NU7
do not connect or connect to GND
5D
NU8
do not connect or connect to GND
6D
NU9
do not connect or connect to GND
5C
NU11
do not connect or connect to GND
6C
NU6
do not connect or connect to GND
4E
NU12
do not connect or connect to GND
4C
NU13
do not connect or connect to GND
3A
NU14
do not connect or connect to GND
UART
3F
GPS_UART_TX
O
Main UART TX.
4F
GPS_UART_RX
I
Main UART RX.
3E
GPS_UART_CTS
I
Main UART CTS. CTS not used. Leave open
I2C
1D
DB_1
must be connected to DB_2
2D
DB_2
must be connected to DB_1
1C
DB_3
must be connected to DB_4
2C
DB_4
must be connected to DB_3
Chip Antenna grounding
P$1
GND
Must be firmly connected to ground plane (see chapter PCB mounting)
P$2
GND
Must be firmly connected to ground plane (see chapter PCB mounting)
GPS Receiver GNS502
Datasheet V01
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© GNS-GmbH 2014
V 0.1, Oct 6 2014
12
9 POWER MANAGEMENT
For quick re-acquisition after power-on, the GNS502 should stay tied to Vdd during off-times to
keep it's RTC clock running. The receiver is put in sleep mode by holding the PTF pin low. The pin
may be controlled by the host controller or by another power management circuitry, which might
be also a simple electromechanical switch.
A static low level on PTF will keep the GNS502 in a deep sleep with power consumption at 81μA.
10 HARDWARE HOST INTERFACE
GNS502 is connected to host system by a UART Interface.
Since GNS502 is used only to deliver NMEA to the host only a single data line from the receiver to
the host is necessary. The interface requires 1.8V I/O. The idle state of the lines is positive voltage.
To interface a standard RS232 UART (e.g. a PC serial interface), please add an inverting level
shifter. To interface processors that have a different interfacing voltage level, level shifters are
required.
10.1 GPS UART Interface details
The UART interface is used to send NMEA messages and control data.
The default baud rate is 9600, other baud rates can be selected by ordering option.
The maximum baud rate deviation supported is ±2%.
GPS UART Default Settings
Parameter
Value
Baud rate
9600
Data length
8 bits
Stop bit
1
Parity
None
GPS Receiver GNS502
Datasheet V01
confidential information preliminary specification
© GNS-GmbH 2014
V 0.1, Oct 6 2014
13
11 NMEA DATA
The GNS502 provides NMEA (National Marine Electronics Association) 0183 compatible data.
The following table shows the available NMEA sentences. All active NMEA sentences are sent at the
selected baud rate.
NMEA available sentences
Type
content
$GPRMC
Recommended Minimum Navigation Information
$GPGGA
Global Positioning System Fix Data, Time, Position and fix
related data for a GPS receiver
$GPGSV
Satellites in view
$GPGLL
Geographic Position - Latitude/Longitude
$GPGSA
GPS DOP and active satellites
$GPVTG
Track made good and Ground speed
12 PHYSICAL DIMENSIONS
all units in mm
tolerance for <5mm : ±0.1mm ; for >5mm ±0.2mm
10.0
2.0
0.90
0.55
15.7
GPS Receiver GNS502
Datasheet V01
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© GNS-GmbH 2014
V 0.1, Oct 6 2014
14
13 RECOMMENDED PAD LAYOUT
GPS Receiver GNS502
Datasheet V01
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15
14 DESIGN GUIDELINES
Although GNS502 GPS receiver provides a good performance, care should be taken to provide clean
signal and clean power supplies. Power lines should be blocked near to the receiver with low ESR
capacitors.
Radiated noise from neighbour components may also reduce the performance of the receiver.
Please be aware, that the most sensitive parts – the antenna and the first LNA – are part of the
module !
14.1 Pcb layout (example: GNS502 EVB)
GNS502 uses a high performance chip antenna design.
For optimum performance, a ground plane area is needed on the main board. This area should be
at least 20 x 30mm, a larger ground like 30 x 60mm is recommended.
The groundplane can be part of the main ground layer of the mainboard, some (small) components
in the neighbourhood of the antenna are acceptable. Do not place any bulky or metallic components
near to the antenna (in a distance below 30mm) to avoid unwanted electromagnetic shielding
effects.
Groundplane on
top & bottom.
Be sure to solder
these pads
reliably !
Position of chip
antenna on
502 module
Clearence area.
Keep clear on all
layers !
Use effective
“stiching” to all
ground layers.
GPS Receiver GNS502
Datasheet V01
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16
It’s recommended to place GNS502 at the rim of the main PCB, so that the antenna has a wide
unobstructed working angle.
The marked clearance area below the antenna must be kept clear in any case ! Do not design any
copper tracks or planes in the clearance area ! Do not mount your mainboard directly on a metal
surface. There should be 10..15 mm clearance below the main board.
The two ground solder pads near the chip antenna must be reliably soldered to mainboard.
Please do not place any shielding or lids in the area 5mm below your PCB under the Clearance area.
Plastic enclosures can also have impact on the antenna. Avoid that the antenna is in touch with any
enclosure parts. Product testing should be performed with the PCB already mounted in the final
enclosure.
Generally the rules for good and low noise design should be followed:
Use a solid ground plane, best on layer 2 of the mainboard
Place enough vias (min 0.3/0.6mm) to ensure proper grounding (see example above).
Keep noisy components (µC, switch mode supplies) as far as possible away from sensitive
antenna inputs
Place decoupling capacitors near to the source of noise and provide a short and low
induction connection to ground (use multi-vias if needed)
EMC filters or noise filtering coils or beads can help to reduce the noise level further.
Select system clocks in a way, that no harmonics will match the GPS frequency of 1575.42
MHz
GPS Receiver GNS502
Datasheet V01
confidential information preliminary specification
© GNS-GmbH 2014
V 0.1, Oct 6 2014
17
15 PACKAGE INFORMATION
15.1 TAPE
GPS Receiver GNS502
Datasheet V01
confidential information preliminary specification
© GNS-GmbH 2014
V 0.1, Oct 6 2014
18
15.2 REEL
:
Number of devices: 1500 pcs/reel
16 ORDERING INFORMATION
Ordering information
Type
Part#
Marking
Description
GNS502
4037735105324
GNS502
1440
<Serial>
Type
Date yyww
Serial#
GNS GPS receiver
GPS Receiver GNS502
Datasheet V01
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© GNS-GmbH 2014
V 0.1, Oct 6 2014
19
17 CUSTOMER SPECIFIC FACTORY OPTIONS
Some features of GNS502 are factory presets, that should be added to your order information. Just
replace <options> by the Short options given in the table below.
Please use a comma "-" for separating the options.
You do not need to specify option values that are shown to be default.
Type
Default value
Possible options
Short
note
UART baudrate
9,600 baud
Baud=9600bps
Baud=19200bps
Baud=38400bps
Baud=57600bps
Baud=115200bps
9
19
38
57
115
The serial output baud rate.
APM feature
Not active
APM active
APM not active
A
APM feature allows the GPS
engine to save energy under
good reception conditions. Please
define A , if you wish to have
APM activated.
GPS output rate
1 second (R1)
Rate is x seconds
(x=1,2,3,4,5,10,
30,60)
R<x>
This option is useful to optimize
transfer times by lowering the
rate of NMEA messages. Has no
influence on the GPS engine
activity.
NMEA selection
All 6 types
All combinations
possible
RMC
GGA
GSV
GLL
GSA
VTG
saving unused NMEAs. Please
specify all types that should be
available
GSV output rate
1
GSV=1
GSV=5
G1
G5
GSV rate can be selected as a
multiple of the GPS output rate.
This option is used to reduce
average data transfer.
G5 with a rate of 1 will produce
GSV output every 5 seconds
Pulse per
second output
active (on)
PPS on
PPS off
/P
Activates or deactivates the
hardware precision pulse per
second. Since active is default,
please define /P (no PPS) if PPS
should not be available.
For example, if you wish to have a baudrate of 115.2k, and only RMC (once per second) and GSV (every 5
seconds) as output data, please order as follows :
GNS502 115-RMC-GSV-G5
In another example, Baud Rate is 38400bps, all NMEA sentences except GSV and VTG should be sent at a rate
of once per 5 seconds. PPS shall be off:
GNS502 38-RMC-GGA-GLL-GSA-R5-/P
GPS Receiver GNS502
Datasheet V01
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20
18 ENVIRONMENTAL INFORMATION
This product is free of environmental hazardous substances and complies to
2002/95/EC. (RoHS directive).
19 DOCUMENT REVISION HISTORY
V0.1
Oct 6 2014
P.Skaliks
initial document
GNS GMBH 2014
THE INFORMATION IN THIS DOCUMENTATION DOES NOT FORM ANY QUOTATION OR CONTRACT. TECHNICAL DATA ARE DUE TO BE CHANGED WITHOUT
NOTICE.
NO LIABILITY WILL BE ACCEPTED BY THE PUBLISHER FOR ANY CONSEQUENCE OF THIS DOCUMENT'S USE.
REPRODUCTION IN WHOLE OR IN PART IS PROHIBITED WITHOUT THE PRIOR WRITTEN CONSENT OF THE COPYRIGHT OWNER
