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HMR3500

P1-P3P4-P6
TruePoint™ Compass Module
HMR3500
The HMR3500 TruePoint™ compass module is a 3-axis
digital compass solution with a customizable coordinate
system for mounting in any desired orientation. Three
Anisotropic Magneto-Resistive sensors and three MEMs
accelerometers are combined to provide compass heading
as well as pitch and roll angles.
The HMR3500 has provisions for hard and soft-iron
correction algorithms to handle magnetic distortion effects.
In addition a World Magnetic Model feature is provided to
automatically add declination angle corrections for
reference to true north (geographic north).
Honeywell provides product excellence and performance by introducing innovative solid-state magnetic sensor solutions.
These are highly reliable, top performance products that are delivered when promised. Honeywell’s magnetic sensor
products provide real solutions you can count on.
FEATURES BENEFITS
4
Precision Compass Accuracy
4
Better Than 1° Nominal Heading Accuracy (1 σ), 0.1° Resolution
4
Tilt-Compensated
4
±89° Pitch and Roll, 360° Continuous Roll Capabilit y
4
Update Rate to 25Hz
4
Rapid Heading Computations for Guidance Applications
4
Compact Solution in a 1.97” by 1.65” by
0.52” PCB Assembly
4
Small Size for Tight Mounting Conditions, Minimal Layout Constraints
4
Hard and Soft-Iron Compensation
Routines
4
User Driven Calibration to Null Stray Fields. A Single Routine for Both
Hard and Soft Iron Corrections
4
World Magnetic Model Included
4
Choice of True North or Magnetic North References
4
-40° to +85°C Operating Temp Range
4
Consumer and Industrial Environment Uses
4
+5 DC Supply Voltage Range
4
Customizable to a Wide Variety of Power Sources
4
Light Weight
4
3.0 oz with Aluminum Housing, 0.6 oz PCB only
4
Customizable Coordinate System
4
24 Custom Coordinate Orientations
4
All Solid State Components
4
Rugged for User-Defined Orientation Plane
HMR3500
2
www.honeywell.com
SPECIFICATIONS
Characteristics Conditions Min Typ Max Units
Heading
Accuracy (Clean Magnetic Environment)
Level
Pitch 0° to ±30°
Roll 0° to ±30°
-
0.5
0.75
0.75
1
(1 σ)
Resolution 0.1 deg
Repeatability 3 sweeps, 0º to 360º, level 0.2 deg σ
Pitch and Roll
Roll Range Default orientation, rotation about X-axis
±180°
deg
Pitch Range Default orientation, rotation about Y-axis
±80°
deg
Accuracy Roll ±30º, Pitch ±30º 0.5 1 deg σ
Null Accuracy
1
Level ±0.5 deg
Resolution Level, 1-sigma, 100 readings 0.04 deg
Roll Repeatability Roll ±70º
Pitch ±70º
0.2
0.2
deg σ
Pitch Repeatability
Roll ±70º
Pitch ±70º
0.1
0.1
deg σ
Magnetic Field
Range Maximum Magnetic Flux Density 0.7 gauss
Resolution 1-sigma, 100 readings 0.45 milli-
gauss
Dip Angle Earth’s Vertical Field Component -70 +70 deg
Linearity 0.2 %FS
Electrical
Standard Product 2.5 5.0 5.2 volts DC
Power Input Voltage 2.5 to 5.2V 300 mW
Digital Interface
UART ASCII 4800 9600 38,400 Baud
Update Rate Continuous Heading Updates 0.05 10 25 Hz
Format Bi-directional binary packet data protocol. RS-232 -
Physical
Dimensions Circuit Board Assembly 1.97 x 1.65
x 0.52
inches
Weight HMR3500 PCB only
HMR3500 with case, no cable
0.6
3.0
ounce
ounces
Connector 5-pin, 2mm pin spacing -
Environment
Temperature Operating
Storage (OEM only)
-40
-55
-
-
+85
+125
°C
°C
1
Null zeroing prior to use of the HMR3500 and upon exposure to temperature excursions beyond the Operating
Temperature limits is required to achieve highest performance.
* Tested at 25°C unless stated otherwise.
HMR3500
www.honeywell.com 3
PIN CONFIGURATION
Pin Number Pin Name Description
1 Ground Power Supply Return and Ground Reference
2 RXD RS-232 Receive Data
3 TXD RS-232 Transmit Data
4 +Vin Positive Power Supply Voltage Input
5 Ground Ground Reference (for twisted pair routing with +Vin)
BASIC DEVICE OPERATION
The HMR3500 TruePoint™ Compass Module includes 3-axis Anisotropic Magneto-Resistive (AMR) sensors, 3-axis
MEMS accelerometers, a temperature sensor, and 16-bit microprocessor with onboard Analog to Digital Converter (ADC).
The HMR3500 is available as a printed circuit board assembly, or assembled in a black aluminum case with cable
assembly. Additionally, the cable assembly can be ordered separately. A demonstration kit of the HMR3500 is available
with the case, cable assembly, a CD of the CompassHost windows utility software for the user’s personal computer.
The HMR3500 requires an external DC power supply for the red (positive) and black (ground) wires of the cable
assembly. By feeding 5 volts at about 50 milli-amperes into the HMR3500, the compass will operate, and a red LED on
the printed circuit board assembly will begin blinking at a 1Hz rate. Lack of a blinking LED or at a rapid rate is an
indication of an error, and action should taken to cycle power on the compass electronics to reset the module.
As a factory default, the RS-232 interface is set at 9600 baud with one start bit, 8 data bits, one stop bit, and no parity bits.
The HMR3500 does not require any hardware or software handshaking or related features. The baud rate can be
changed by command after initial communication at the current baud rate.
The CompassHost utility software is a 32-bit Windows® application program that is provided with the HMR3500
demonstration kit, and can be used to evaluate the HMR3500’s performance and demonstrate the compass features. With
exception of the baud rate change command, the CompassHost is capable of sending and receiving all of the commands
of the compass/computer interface. Host computers should be capable of running Windows 9x, ME, NT, 2000, XP and
follow-on operating systems. An install program loads the executable file CompassHost.exe and ActiveX components. A
readme.txt file is also included to describe the installation process.
PHYSICAL CHARACTERISTICS
The circuit board for the HMR3500 is 1.57 by 1.97 by 0.52 inches and composed of multi-layer, fiberglass-epoxy printed
boards, with the main board horizontal and a vertical board for mounting the z-axis magnetic sensor and accelerometer.
The vertical board is held orthogonal to the main board by two brass hardware blocks to ensure mechanical orthogonality.
1.57
1.97
1.00
0.150
1.65
0.150 0.170
φ
0.116
4 PLCS
Forward
Direction
X
Y
Pin 1
1.57
1.97
1.00
0.150
1.65
0.150 0.170
φ
0.116
4 PLCS
Forward
Direction
X
Y
Pin 1
Figure 1
HMR3500 Top View and Dimensions
P1-P3P4-P6

HMR3500

Mfr. #:
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Description:
3-AXIS COMPASS MODULE
Lifecycle:
New from this manufacturer.
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