True North Technologies

Revolution™ 1501LP
Low Power ElectronicCompass
General Description
The Revolution™ LP is a strap-down electronic compass
designed specifically for commercial, industrial, and militaryusers. The LP will be of particular interest to ROV and AUV
manufacturers who are concerned with power usage andaccurate heading in all types of challenging conditions. In
standby mode, it draws a mere 50 μA and requires only 15mA in run mode. It provides accurate heading data in lessthan a tenth of a second from wakeup. An extended range
tilt sensor is available that allows for +/-60° of pitch and roll.

High Accuracy
Heading within 0.5 or better
Tilt within 0.3 or better Wide Operating Range42 Pitch and Roll*80 Dip angle rangeTemperature -20 to 70C
Local Hard Iron to 1 Gauss Fast Response
14 readings per second
Wake from standby in 75 msec
 Single Supply Operation
6 to 25V unregulated DC Low Power
15 mA in run mode
5 mA in sample mode
50 μA in standby modeWide Selection of Output dataHeading, pitch, and rollMagnetometer X, Y, and Z
Dip angle

Total, horizontal, and vertical magnetic fieldstrengthInterface
Full-duplex RS-232 or TTL
In-System Configuration and Test
PC or laptop can be connected while unit
operates in-situ
Perform hard and soft iron calibration*60 with optional tilt sensor

Recommended applications are unmanned vehicles, robotics,weather buoys, antenna positioning, and marine navigation.

Why a Revolution LP?
Many aspects of the LP remain unchanged from the original
Revolution including its quick-connect, external serialinterface. While the compass is in-place, and without
disconnecting system wiring, a serial cable or available USB
cable can be temporarily connected via the RJ12-style
modular jack. This allows easy access during installation for
calibration and tuning. It also provides a valuable diagnostic
port and can be used for an auxiliary read-out when needed.
In situations where afixed installation is notdesirable, the RJ12
connection can be used
exclusively.
Among the host of user
definable parameters isthe selection of NMEA
output data and update
rate, operating mode as continuous or query-only, and angle
data in degrees, mils, radians, or 16-bit integer (65536 counts
per revolution). Compensation for both hard and soft ironinfluences is built-in.

About True North
True North Technologies, a 25-year-old manufacturer, offersa development kit that includes the compass, cable, andsoftware. All products are made in the USA.

True North Technologies LLC • 43 Broad St. Suite B308 • Hudson, MA 01749 USA
Ph: 978-897-5400 • Email: info@tntc.com • Website: www.tntc.com© 2022True North Technologies LLC

Revolution™ LP Electronic Compass

Specifications
Heading Performance
Parameter

ValueComments

Accuracy
Repeatability
Response time
Dip Angle Range
Tilt Range
Update rate

 0.5 rms
 0.2
75 msec
 80
 42
14 per second

Typical, Tilt < 35 Dip < 60
No filter
Minimum, no filter

Parameter

Value

Comments

Accuracy
Repeatability
Range
Settling time 0.3
 0.2
 42
0.5 sec

Factory calibrated
No filter±60° available
No damping

Value
15 mA operating
5 mA sample
50 μA standby
6 – 25 Vdc unregulated

Comments
typicaltypical
typicalValue-20 to 70 °C-50 to 150 °C
0 to 90%

Comments±60° available

Pitch and Roll PerformanceElectricalParameter
Supply Current

Supply Voltage (VDD)

Environmental
Parameter
Operating Temp
Storage Temperature
Humidity

Non-condensing

MechanicalParameter
Box
PCB Size
PCB Mounting
WeightConnectors

Value
Comments
Hammond Mfg1591M(L)FL
1.6"W x 3.0"L x 0.6"(.08”)H
H required for tilt sensor
4 #4 screws, 1.4" x 2.2" spacing
3 oz. in box
8 pin, single-row, 0.1" friction header
6 pin RJ12 modular jackInterfaceParameter

Value

Signal type
Baud rate
Character Format
Input Buffer Size
Output Buffer Size
Output Format
Output Data Rate
Operating Modes
Angle Units

RS232 or TTL
2400, 4800, 9600, or 19200 bps
8 data, no parity, 1 stop
90 characters
110 characters
NMEA 0183
1 to 1200 sentences per minuteContinuous or sample
Degrees, mils, radians, 16-bit integer

True North Technologies LLC • 43 Broad St. Suite B308 • Hudson, MA 01749 USA
Ph: 978-897-5400 • Email: info@tntc.com • Website: www.tntc.com© 2022 True North Technologies LLC

Revolution™ LP Electronic Compass