JGR-SC3-M.pdf

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JGR-SRM-ST Specification
JGR-SC3-M (Jnavi) High-Performance GPS Receiver
JGR-SC3-M
GPS RECEIVER MICRO-COMPONENT
DATA SHEET
JCOM
MODEL NAME
JGR – SC3 – M
JCOM
CODE NO.
CUSTOMER
MODEL NAME
JGR – SC3 - M
INVESTIGATION
INSPECTION
APPROVAL
J communications co., Ltd.
J communications co., Ltd. www.jcomco.com
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JGR-SC3-M (Jnavi) High-Performance GPS Receiver
Contents
1. Functional Description
1.1 Features
1.2 Block Diagram
1.3 Receiver Unit Specifications
2. Interface Specification
2.1 External Interfaces
2.1.1 I/O Pin Description
2.1.2 I/O Port Internal Information
2.2 Serial Interfaces
2.3 Serial Interfaces setting ( User programmable setting command)
3. Electrical Specification
3.1 Test Circuit
3.2 Absolute Maximum Ratings
3.3 Operating Conditions
3.3.1 DC Characteristics
3.3.2 AC Characteristics
3.4 Typical Electrical Characteristics
3.4.1 RF Input Impedance
4. Performance Specification
5. Mechanical Specification
5.1 Outline Drawing
5.2 Normal Label
5.3 PCB Solder Pad of Bottom
5.4 Recommend PCB Layout
5.5 Reflow Profile
J communications co., Ltd. www.jcomco.com
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JGR-SC3-M (Jnavi) High-Performance GPS Receiver
1. Functional Description
1.1 Features
Full self-contained GPS receiver
Fully shielded design
Full implementation of SiRFstar TM III GPS architecture
GSC3F(High Performance GPS Single Chip)
GPS DSP with integrated real time clock(RTC) ARM7TDMI CPU
4Mbit FLASH memory
Low noise amplifier
SAW filter
TCXO
GPS receiver in a micro-component package
Postage stamp type package
Fully automatic assembly : Reflow solderable
No RF connector
Size : 25.4mm X 25.4mm X 3.4mm
Weight : 3.5 grams
1.2 Block Diagram
-/"
4"8
GJMUFS
4J3'(4$'
5$90
3&4&5
35$
9UBM
#"$,61
4*3$6*5
J communications co., Ltd. www.jcomco.com
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JGR-SC3-M (Jnavi) High-Performance GPS Receiver
1.3 Receiving Unit Specifications
Receiver type : L1 frequency, C/A Code, 20-channel
Max up-date rate : 1 sec
Accuracy (SA off) : Position < 10m 3D RMS
3D Tracking Sensitivity : -156dBm at the receiver input(typical)
Re-acquisition Sensitivity : - 153dBm at the receiver input(typical)
Operational Limits : Altitude < 18,000m (60,000ft)
Velocity < 515m/s (1,000knots)
Time To First Fix (TTFF)
a) Cold Start 60sec (typical)
In a ‘Cold Start’ scenario, the receiver has no knowledge of position, time or the satellite
constellation. The receiver starts to search for signals blindly.
Cold start time is the longest startup for this module
b) Warm Start 40sec (typical)
In a ‘Warm Start’ scenario, due to a backup battery the receiver knows its last poison,
the approximate time and the constellation almanac.
Thanks to this it can quickly acquire satellites and gat a position fix faster then in ‘Cold
Start’ mode.
c) Hot Start < 1sec (typical)
In a ‘Hot Start’ scenario, the receiver has been powered off for less then 2 hours since
the last valid navigation solution. The GPS uses its last Ephemeris data to calculate a
position fix.
Re-acquisition time 3sec typical (within 60sec GPS signal obstruction)
1.4 Protocols
Default : WGS84 NM EA 0183 9600bps
"DUJWBUFENFTTBHF(("(4"(473.$BMMXJUIDIFDLTVNFOBCMFE
User programmable setting for baud rate, NMEA & Interval time
by user define message setting Command.
(see 2.3 Serial Interface Setting)
J communications co., Ltd. www.jcomco.com
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JGR-SC3-M (Jnavi) High-Performance GPS Receiver
2. Interface Specification
2.1 External Interfaces
2.1.1 I/O Pin Description
Pin
Name
Pin Description
I/O Note
1
VCC
Supply Voltage
I
2
GND
Ground
3
BOOTSEL Module boots into flash memory
I
Leave unconnected if not used.
program mode if VCC during
Use only factory production
reset
4
RXA
Serial Port A
I
Open if not used
5
TXA
Serial Port A
O
6
TXB
Serial Port B
O
7
RXB
Serial Port B
I
Open if not used
8
NC
9
NC
10-16
GND
Ground
17
RF-IN
GPS signal form antenna
I
50 ʃ (1.57542GHz)
18
GND
Ground
19
V-ANT
Active antenna power input
I
20
VCCRF
Power supply out for V-ANT
O
21
V-BAT
Backup Power Input for RTC
I
22
NC
23
GPIO15
I/O Leave unconnected if not used.
24
NC
25
NC
26
NC
27
NC
28
GPIO1
GPS Tracking indication output
O
Not fix : blinking fix : on
29
GPIO9
I/O Leave unconnected if not used.
30
GND
Ground
J communications co., Ltd. www.jcomco.com
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