USGlobalsat EM-408 User Manual
EM-408
Version 1.4.1
GPS Engine Board
EM-408
Globalsat Technology Corporation
16F., No. 186, Jian-Yi Road, Chung-Ho City, Taipei Hsien 235,
Ta iw an
Tel: 886-2-8226-3799/ Fax: 886-2-8226-3899
service@globalsat.com.tw
www.globalsat.com.tw
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USGlobalSat, Inc.
14740 Yorba Court, Chino, CA 91710
Tel: 909.597.8525 / Fax: 909.597.8532
oem@usglobalsat.com
www.usglobalsat.com
Specifications are subject to be changed without notice.
EM-408
Version 1.4.1
1. Product Information
Product Part I.D. EM-408
Product Description
The EM-408 GPS engine board is low cost but maintains high reliability and accuracy making it an
ideal choice for integration with OEM/ODM systems. The EM-408 features an integrated patch
antenna for complete implementation.
Product Features
SiRF Star III high performance GPS chipset
Very high sensitivity (Tracking Sensitivity: -159dBm)
Extremely fast TTFF (Time To First Fix) at low signal levels
Supports the NMEA 0183 data protocol
Built-in SuperCap to maintain system data for rapid satellite acquisition
Built-in patch antenna
Foliage Lock for weak signal tracking
Compact in size
All-in-view 20-channel parallel processing
Superior urban canyon performance
WAAS / EGNOS support
RoHS compliant
Product Specifications
GPS Receiver
Chipset SiRF Star III/LP Single
Frequency L1, 1575.42 MHz
Code 1.023 MHz chip rate
Protocol Electrical Level: TTL level,
Channels 20
Output Voltage Level: 0V~2.85V
Baud Rate: 4800 bps ~ 57,600bps
(adjustable)
Output Message: NMEA 0183 GGA, GSA,
GSV, RMC (VTG, GLL optional)
Specifications are subject to be changed without notice.
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EM-408
Sensitivity -159dBm
Cold Start 42 seconds average
Warm Start 38 seconds average
Hot Start 8 second average
Reacquisition 0.1 second average
Accuracy Position: 10 meters, 2D RMS
5 meters, 2D RMS, WAAS enabled
Velocity: 0.1 ms
Time: 1µs synchronized to GPS time
Maximum Altitude 18,000 meters (60,000 feet) max
Maximum Velocity 515 meter/second (1000 knots) max
Maximum Acceleration 4G
Datum WGS-84
Jerk Limit 20m/sec **3
Physical Characteristics
Version 1.4.1
Dimensions 1.4” x 1.4” x 0.3” (36.4 x 35.4 x 8.3mm)
DC Characteristics
Power Supply 3.3V DC Input
Power Consumption 44mA (Continuous Mode)
25mA (Trickle Power Mode)
Environmental Range
Humidity Range 5% to 95% non-condensing
Operation Temperature -40F to +185F (-40C to 85C)
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Specifications are subject to be changed without notice.
2. Technical Information
Physical Characteristics
EM-408
Version 1.4.1
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Specifications are subject to be changed without notice.
Pin Assignment
EM-408
Version 1.4.1
Pin Explanation
ENABLE/DISABLE: On / Off
VCC:
TX: This is the main transmit channel for outputting navigation and measurement data to user’s
_ navigation software or user-written software.
GND: GND provides the ground for the engine boards. Be sure to connect all grounds.
(DC power input) This is the main DC supply for a 3.3V power module board.
RX: This is the main receive channel for receiving software commands to the engine board from
SiRfDemo software or from user-written software. (NOTE
kept “HIGH” for operation. From Vcc connect a 470 Ohm resistor in series with a 3.2v Zener
diode to Ground. Then, connect the Rx input to Zener’s cathode to pull the input “HIGH”.)
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: When not in use this pin must be
Specifications are subject to be changed without notice.
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