Document Outline
- Top
- Features
- Description
- Applications
- Specifications
- Pin Configuration
- Circuit Board Layout
- Application Notes
- Ordering Information
HMR4001
SENSOR PRODUCTS
Advance Information
Web Site:
www.magneticsensors.com
Honeywell
Email:
ssec.customer.service@honeywell.com
Solid State Electronics Center
12001 State Highway 55
2001 HMR4001 Published Jun 2001 Page 1
Plymouth, Minnesota 55441-4799
1-800-323-8295
LINEAR POSITION SENSOR MODULE
Features
·
0-10 mm Magnetic Travel (Magnet Dependent)
·
Continuous PWM and Analog Voltage Outputs
·
0.2mm Accuracy (Magnet Dependent)
·
0.05mm Repeatability
·
-40° to +85°C Operating Temperature Range
·
1%/100°C Temperature Effect
·
Small PCB Package
·
6 to 20 volt DC Single Supply Required
General Description
The Honeywell HMR4001 is a high-resolution single
sensor module capable of measuring linear or angular
position. Advantages include high sensitivity so lower
cost magnets such as alnico or ceramic can be used,
insensitivity to shock and vibration, and ability to
withstand large variations in the gap between the
sensor and the magnet.
The HMR4001 is manufactured with Honeywell's
HMC1512 Magnetic Displacement Sensor IC, which
provides better performance than Hall Effect devices
and only needs a magnetic field source greater than 80
gauss. Dual frequency PWM and analog outputs plus a
sleep mode function are included on board
Block Diagram
· Linear Displacement
· Shaft Position
· Angular Displacement
·
Proximity Detection
APPLICATIONS
HMR4001
SENSOR PRODUCTS
Advance Information
Web Site:
www.magneticsensors.com
Honeywell
Email:
ssec.customer.service@honeywell.com
Solid State Electronics Center
12001 State Highway 55
2001 HMR4001 Published Jun 2001 Page 2
Plymouth, Minnesota 55441-4799
1-800-323-8295
SPECIFICATIONS
Characteristics
Conditions
Min
HMR4001
Typ
Max
Units
Linear Position
Range
> 80 gauss at sensor
10
mm
Accuracy
> 80 gauss at sensor
0.2
mm
Repeatability
> 80 gauss at sensor
0.05
mm
Angular Position
Range
> 80 gauss at sensor
90
deg
Accuracy
> 80 gauss at sensor
0.1
deg
Repeatability
> 80 gauss at sensor
0.07
deg
Magnetic Field
Strength
Repeatability <0.03% FS
80
-
-
gauss
Electrical
Voltage
Unregulated
6
-
20
volts DC
Current
Supply
Active Mode - SLEEP pin = 5V (or open)
Sleep Mode - SLEEP pin = 0V
7
< 2
mA
mA
PWM Output
Frequency
FS = 5V (or open)
FS = 0V
350
250
Hz
Hz
Frequency
Accuracy
Ambient Temperature (+23°C)
+/-8
-
-
%
PWM Range
"1" Level Duty Cycle
1
-
99
%
PWM
Amplitude
"1" Level at any Position
4.5
-
5.5
Volts
pk-pk
Analog Output
Range
Ambient Temperature (+23°C)
-
4.0
-
volts
Physical
Dimensions
circuit board only
15x48.5x12
mm
Weight
circuit board only
5
grams
Environment
Temperature
Operating
Storage
-40
-55
-
-
+85
+125
°C
°C
HMR4001
SENSOR PRODUCTS
Advance Information
Web Site:
www.magneticsensors.com
Honeywell
Email:
ssec.customer.service@honeywell.com
Solid State Electronics Center
12001 State Highway 55
2001 HMR4001 Published Jun 2001 Page 3
Plymouth, Minnesota 55441-4799
1-800-323-8295
P
in Configuration
Pin
Function
Description
VA
ANALOG OUTPUT
Analog Version of the PWM Output Using a Low Pass
Filter.
PW
PWM OUTPUT
Digital Signal With the "1" Level Equivalent to the
Position of the Magnet. Period at 250 or 350 Hz.
FS
FREQUENCY SELECT INPUT
Selects the Pulse Width Modulation Frequency:
1=350Hz, 0=250Hz (onboard pullup)
V+
POWER SUPPLY INPUT
Power Supply Input of +6 to +20 Volts DC.
SL
SLEEP/WAKE INPUT
Selects the Wake or Sleep Mode: 1=Wake, 0=Sleep.
Onboard Pullup Resistor to Keep Board in Wake Mode.
GD
GROUND
Ground Reference for Supply and I/O
Circuit Board Layout
Application Notes
Very high precision position measurements using weak magnetic fields should note the influence of the earth's
magnetic field (~ 0.6 gauss) bias on the sensed magnet position.
The center-line of HMC1512 sensor integrated circuit U1 is determined to be midpoint (50% Pulse Width, 2.5v
Analog) for position sensing.
Only one of the two sensor bridges in the HMC1512 is used for sensing the external magnetic field. The other
magneto-resistive bridge network is used as temperature compensation network to retain precise positioning over a
broad temperature range. Thus the single bridge provides its linearity over a 90° sweep (+/- 45°) as opposed to when
both HMC1512 bridges are working together for a 180° (+/- 90°) sweep.
For best performance, a magnetic field of at least 80 gauss measured at the sensor location should be maintained. A
simple dipole magnet usually has the strongest field near its poles, and the field decreases with the distance. For
example: An AlNiCo cylindrical magnet with a 0.25" diameter has field strength of 700 gauss at its surface. With a
0.25" gap between the sensor and the magnet, the field at the sensor is about 170 gauss. This is enough field
strength to maintain the sensor in the saturation condition for most applications.
HMR4001
SENSOR PRODUCTS
Advance Information
Web Site:
www.magneticsensors.com
Honeywell
Email:
ssec.customer.service@honeywell.com
Solid State Electronics Center
12001 State Highway 55
2001 HMR4001 Published Jun 2001 Page 4
Plymouth, Minnesota 55441-4799
1-800-323-8295
Demonstration PCB Module
The HMR4001 Demo Module includes an attached magnet and slide assembly for evaluating the performance of the
module.
Ordering Information
Ordering Number
Product
HMR4001-D00 -DEMO
HMR4001-D00
PCB Module with Attached Magnet Assembly
PCB Module Only
Honeywell reserves the right to make changes to improve reliability, function or design. Honeywell does not assume
any liability arising out of the application or use of any product or circuit described herein; neither does it convey any
license under its patent rights nor the rights of others.
HMC1512 Sensor
Magnet
Moving Shaft
N
S
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