HMR4001 SENSOR PRODUCTS Advance Information 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 APPLICATIONS Block Diagram � Linear Displacement � Shaft Position � Angular Displacement � Proximity Detection 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 HMR4001 SENSOR PRODUCTS Advance Information SPECIFICATIONS Characteristics Conditions HMR4001 Min 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 Active Mode - SLEEP pin = 5V (or open) 7 mA Supply Sleep Mode - SLEEP pin = 0V < 2 mA PWM Output Frequency FS = 5V (or open) 350 Hz FS = 0V 250 Hz Frequency Ambient Temperature (+23°C) +/-8 - - % Accuracy PWM Range “1” Level Duty Cycle 1 - 99 % PWM “1” Level at any Position 4.5 - 5.5 Volts Amplitude 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 -40 - +85 °C Storage -55 - +125 °C 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 HMR4001 SENSOR PRODUCTS Advance Information Pin 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. 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 HMR4001 SENSOR PRODUCTS Advance Information Moving Shaft N S Magnet HMC1512 Sensor 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 PCB Module with Attached Magnet Assembly HMR4001-D00 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. 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