Trimble Lassen SK II |
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| GPS interface module for embedded applications |
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Power consumption <0.5 W.
Next-generation RF technology.
Reliable performance from – 40° to +85°.
Fully backward compatible with the Lassen-SK8.
Differential GPS (DGPS) ready.
Choice of three data protocols.
Starter kit available.
 Data Sheet Manual
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The new Lassen ™ SK II GPS module is one of the newest members of Trimble’s renowned Lassen line of OEM GPS products for embedded applications. Lassen SK II builds on the original Lassen-SK8’s outstanding performance and success in demanding automotive applications. The Lassen SK II is intended primarily for OEMs and system integrators who require maximum GPS performance, flexible configuration capability and low power usage. Just two-thirds the size of a business card and fully backward compatible with the Lassen-SK8, Lassen SK II makes use of the latest advances in silicon technology to offer even more robust RF performance. Tighter integration of the RF front end using the new Colossus ASIC has slashed the component count by 25 per-cent, cutting power consumption to less than 0.5 watts.
Top performance
Using Trimble’s 8-channel technology, Lassen SK II delivers rapid startup times and reliable performance over the entire –40° to +85° C extended temperature range. Lassen SK II incorporates Trimble’s proven software, which outputs highly accurate position data even in areas where satellite signals are weakened by terrain, foliage and structures. The Lassen SK II is also differential GPS (DGPS) ready for applications requiring high levels of accuracy. A full measurement feature is available for advanced applications.
Ease of integration
Lassen SK II’s user-configurable, dual I/O serial ports mean greater flexibility and fast integration. A choice of three data protocols provides the user with maximum configuration capability. The primary serial port may be configured either to the TSIP (Trimble Standard Interface Protocol) binary data protocol for total control over system operation; or to the easy-to-use TAIP (Trimble ASCII Interface Protocol), which is ideal for tracking applications. The secondary serial port outputs NMEA-0183 standard data messages and can receive RTCM SC-104 differential correction data for two-meter DGPS accuracy. The Lassen SK II also incorporates Trimble’s antenna detection and protection features to monitor the condition of the GPS antenna system.
Getting Started
Lassen SK II’s Starter Kit provides everything you need to get started integrating state-of-the-art GPS into your application.
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Performance Specifications
| General: |
L1 frequency, C/A code (SPS), 8-channel, continuous tracking receiver, 32 correlators. |
| Update rate: |
TSIP @ 1Hz; NMEA @ 1Hz. |
| Accuracy: |
Position: 25m CEP (50%) without SA.
Velocity: 0.1 m/sec without SA.
Time ±95 nano-seconds (over-determined clock mode). |
| DGPS accuracy: |
Position: 2m CEP (50%).
Velocity: 0.05 m/sec.
Time: ±500 nano-seconds (nominal). |
| Acquisition: |
Cold start: <130 seconds (90%) (Cold start requires no initialization).
Warm start: <45 seconds (90%) (Warm start implies last position, time and almanac are saved by back-up power).
Hot start: <20 seconds (90%) (Hot start implies ephemeris also saved).
Reacquisition after signal loss < 2 seconds (90%). |
| Dynamics: |
Acceleration 4g (39.2 m/sec˛ ).
Motional Jerk 20 m/secł. |
| Operational limits: |
Altitude <18,000m or velocity <515 m/sec either limit may be exceeded but not both. |
Environmental Specifications
| Operating temp |
–40°C to +85°C |
| Storage temp |
–55°C to +100°C |
| Vibration |
0.008 g 2 /Hz 5Hz to 20Hz.
0.05 g 2 /Hz 20Hz to 100Hz.
3dB/octave 100Hz to 900Hz |
| Operating humidity |
5% to 95% R.H. non-condensing, @ +60°C |
| Altitude |
–400m to +18,000m |
Technical Specifications
| Prime power |
+5V DC, ±5%. |
| Power consumption (nominal): |
GPS board only: 95mA, 0.47W.
With antenna: 120mA, 0.60W. |
| Back-up power: |
+3.2 to +5V DC.
2µA @ +3.5V, +25°C (nominal).
Serial ports/1PPS CMOS TTL levels.
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| Protocols: |
TSIP @ 9600 baud, 8-Odd-1.
NMEA 0183 v2.1 @ 4800 baud, 8-None-1.
RTCM SC-104 @ 4800 baud, 8-None-1. |
| NMEA messages |
GGA, VTG, GLL, ZDA, GSV, GSA and RMC messages selectable by TSIP command; selection stored in non-volatile memory. |
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Antenna power 5V at 25mA available. |
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Short circuit protection. |
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Feedline fault detection. |
| Dimensions |
82.6mm x 31.2mm x 10.2mm without connectors. |
| Weight |
0.7 oz. (19.6 g) without optional shield. |
| Connectors: |
RF: SMB.
I/O: 8-pin (2x4), 0.100" header |
Physical Characteristics
Dimensions:
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Metal enclosure 4.03" D x 4.97" W x 1.1" H (102mm x 127mm x 28mm) (excluding mounting flange)
Mounting flange 4.03" D x 6.81" W x 0.062" H (102mm x 173mm x 2mm) |
Weight:
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0.57 lb. (0.26kg) (board + enclosure + flange)
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Connectors:
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Antenna SMB
Serial data (2) DB9
Power 3-pin Conxall
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Accessories
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GPS antenna: Compact, active micropatch antenna with 5-meter cable and magnetic mount. 1.65" x 1.99" x 0.55" high (42mm x 50.5mm x 13.9mm). |
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Hard mount antenna: Compact, hard mount, active micropatch antenna with single-hole 0.75" threaded mount and TNC connector. 2.46" diameter x 0.75" high (62.6 mm x 19.0 mm). |
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Rooftop antenna: Bullet antenna with 22-meter cable and SMB adapter. |
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RF shield: Optional snap-on shield kit for severe RF environments. |
Ordering Details
| 38116-20 |
Lassen SK-II 5V, TSIP, NMEA & TAIP protocol, DGPS ready. extended temperature |
| 40767-00 |
26 dB magnetic mount antenna, 5-meter cable, SMB connector |
| 28367-70 |
26 dB hard mount antenna, TNC connector |
| 23726-00 |
35 dB rooftop Bullet antenna, 23-meter cable & F type to SMB cable |
| 39665-10 |
Shield kit for Lassen SK-II |
| 39069-01 |
Lassen SK II system designer reference guide |
| 38982-00 |
Lassen SK-II starter kit. |
Starter kit includes Lassen SK II board, interface motherboard in durable metal enclosure with dual DB9, RS-232 interface, AC/DC power converter, magnetic mount antenna, TSIP and NMEA protocols, software toolkit for TSIP, interface cable and manual.
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