Synchronous Communication Protocol.......................................................................................................................................9
DEVELOPMENT KIT Communication.......................................................................................................................................11
HMR3200 DEMO PROGRAM OPERATION.............................................................................................................................11
HMR3300 DEMO PROGRAM OPERATION.............................................................................................................................11
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•
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Page 2
HMR3200/HMR3300
SENSOR PRODUCTS
INTRODUCTION
The Honeywell HMR3200/HMR3300 are electronic compassing solutions for use in navigation and guidance
systems. Honeywell’s magnetoresistive sensors are utilized to provide the reliability and accuracy of these small,
solid state compass designs. These compass solutions are easily integrated into systems using a UART or SPI
interface in ASCII format.
The HMR3300 is a three-axis, tilt compensated compass that uses a two-axis accelerometer for enhanced
performance up to a
±
60° tilt range.
The HMR3200 is a two-axis compass. Performance is optimized in vertical or horizontal orientations.
SPECIFICATIONS
Characteristics
Heading
Accuracy
Level
0° to
±30°
(HMR3300 only)
±30°
to
±60°
(HMR3300 only)
Resolution
Hysteresis
Repeatability
Pitch and Roll
Range
Accuracy
Null Accuracy*
HMR3200
HMR3300
HMR3200
HMR3300
(HMR3300 only)
Roll and Pitch Range
0° to
±
30°
±
30° to
±
60°
Level
-20°C to+70°C Thermal Hysterisis
-40°C to +85°C Thermal Hysterisis
Resolution
Hysteresis
Repeatability
Magnetic Field
Range
Resolution
Electrical
Input Voltage
Current
Unregulated
Active Mode HMR3200
Active Mode HMR3300
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Page 3
Conditions
Min
Typ
Max
Units
1.0
3.0
4.0
0.1
0.1
0.2
0.1
0.2
0.2
0.4
0.2
0.4
deg RMS
deg
deg
deg
±
60
0.4
1.0
0.4
1.0
5.0
0.1
0.2
0.2
0.5
1.2
deg
deg
deg
deg
deg
deg
gauss
milli-gauss
15
20
24
volts DC
mA
mA
Maximum Magnetic Flux Density
±
2
0.1
6
-
18
22
HMR3200/HMR3300
SENSOR PRODUCTS
Characteristics
Digital Interface
UART
SPI
Update
ASCII (1 Start, 8 Data, 1 Stop,
0 Parity) User Selectable Baud Rate
CKE = 0, CKP = 0 Psuedo Master
Continuous/Strobed/Averaged
HMR3200
HMR3300
Connector
Physical
Dimensions
Weight
Environment
Temperature
Operating (HMR3200)
Operating (HMR3300)
Storage
-40
-20
-55
-
-
-
+85
+70
+125
°C
Circuit Board Assembly
HMR3200
HMR3300
25.4 x 36.8 x
1.1
7.25
7.5
grams
mm
In-Line 8-Pin Block (0.1” spacing)
15
8
Hz
2400
-
19200
Baud
Conditions
Min
Typ
Max
Units
PIN CONFIGURATION
Pin Number
Pin Name
Description
1
SCK
Serial Clock Output for SPI Mode
2
RX/SDI
UART Receive Data/SPI Data Input
3
TX/SDO
UART Transmit Data/SPI Data Output
4
CS
Chip Select for SPI Mode (Input)
5
CAL
Calibration ON/OFF Toggle (Input) trailing edge
6
+5VDC*
Optional +5 VDC Power (Input)
7
GND
Power and Signal Ground
8
+V*
Unregulated Power Input (+6 to +15 VDC)
*Note: Use either pin 6 (+5VDC) or pin 8 (+V) to power the circuit board.
This circuit board is approximately 1.45x1 inches with an 8-pin header. Hold the board with pin header edge close to
you and pins pointing DOWN. Then PIN 1 is the left most pin.
CIRCUIT DESCRIPTION
The HMR3200/HMR3300 Digital Compass Solutions circuit boards include all the basic sensors and electronics to
provide a digital indication of heading. The HMR3200 has all three axis of magnetic sensors on board, but allows the
user to select which pair of sensors for compassing (PCB horizontal or upright with the pin connections on the bottom
and horizontal). The HMR3300 uses all three magnetic sensors plus includes an accelerometer to provide tilt (pitch
and roll) sensing relative to the board’s horizontal (flat) position.
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Page 4
HMR3200/HMR3300
SENSOR PRODUCTS
The HMR3200/HMR3300 circuit starts with Honeywell HMC1021 and HMC1022 single and two-axis magnetic
sensors providing X, Y, and Z axis magnetic sensing of the earth’s field. These sensors are supplied power by a
constant current source to maintain best accuracy over temperature. The sensor output voltages and constant current
sensor supply voltage are provided to multiplexed Analog to Digital Converter (ADC) integrated circuit. A
microcontroller integrated circuit periodically queries the multiplexed ADC and performs the offset corrections and
computes the heading. This microcontroller also performs the external serial data interface and other housekeeping
functions such as the calibration routine. An onboard EEPROM integrated circuit is employed to retain necessary data
variables for best performance.
For the HMR3300, an additional pair of data inputs from the
±2g
accelerometer is received by the microcontroller.
These tilt inputs (pitch and roll) are added to sensor data inputs to form a complete data set for a three dimensional
computation of heading.
The power supply for the HMR3200/HMR3300 circuit is regulated +5 volt design allowing the user to directly provide
the regulated supply voltage or a +6 to +15 volt unregulated supply voltage. If the unregulated supply voltage is
provided, then the linear voltage regulator integrated circuit drops the excess supply voltage to a stable +5 volts. The
power supply is a dual ground (analog and digital) system to control internal noise and maximize measurment
accuracy. The factory default condition for the power supply is pin 8; the unregulated input. To use pin 6 and provide
a regulated +5 volt supply, turn the switch near pins 6 and 7 to the opposite (fully counter-clockwise) position.
PHYSICAL CHARACTERISTICS
The circuit board for the HMR3200/HMR3300 Digital Compassing Solutions is approximately 1.45 by 1 inches. An 8-
Pin header protrudes down on one edge of the board for the user interface or the demo board. The header pins
extend 5/16” below the board plane with the bottom-side mounted magnetic sensor integrated circuits (HMC1021 and
HMC1022) extending 3/16” below the board plane. Components on the top-side have a maximum height of 1/8”.
Figure 1 shows a typical circuit board with dimensions.
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