HMR4007

HMR4007 SENSOR PRODUCTS LINEAR POSITION SENSOR MODULE Features x x x x x x 0-69 mm Magnetic Travel (Magnet Dependent) Microprocessor Digital and Analog Data Outputs 0.1mm Accuracy (Magnet Dependent) 0.1mm Repeatability -40° to +85°C Operating Temperature Range Regulated 5 volt or unregulated 6 to 20 volt DC Supply Compatibility General Description The Honeywell HMR4007 is a high-resolution electronic linear position-sensing module capable of measuring extended range linear position by providing a digital indication of position of a target magnet. Advantages include insensitivity to shock and vibration, known position at power-on, ability to withstand large variations in the gap between the sensor and the magnet, and high sensitivity so lower cost magnets (such as AlNiCo or Ceramic) can be used. The HMR4007 is manufactured with Honeywell's HMC1501 magnetoresistive (MR) sensors in a stationary array, which provides better performance than Hall Effect devices and only needs a magnetic field source greater than 80 gauss. APPLICATIONS Block Diagram x Linear Displacement x Shaft Position HMC1501 IN_AMP ADC HMC1501 EEPROM HMC1501 x Potentiometer Replacement HMC1501 x DIO MicroController J1 MUX Fluidic Pumps J2 HMC1501 DAC HMC1501 ANALOG HMC1501 Solid State Electronics Center • www.magneticsensors.com • (800) 323-8295 • Page 1 HMR4007 SENSOR PRODUCTS SPECIFICATIONS Characteristics Conditions Min Typ Max Units 0.2 0.1 mm Resolution 0.01 mm Hysteresis 0.01 mm Repeatability 0.01 General Accuracy Update Rate Standoff 10 Distance (gap) between the target magnet and the sensor board 0.1 30 0.1 5 50 (note 1) mm Hz (note 1) mm Magnetic Field Range magnetic field at the sensor array 35 length apparent magnet length at sensor array 23 Orientation Axial = mag poles parallel to sensor array gauss mm Axial (note 2) Electrical Input Voltage Unregulated 5 10 28 VDC 15 20 mA 1000 21,000 Bits / sec. ( “1” ) 3.5 5.0 VDC ( “0” ) -0.3 1.5 VDC 0 2.5 VDC Current Digital Interface Baud Rate Signaling Level Connector nonstandard synchronous serial interface TTL levels In-Line 6-Pin Block (0.1” spacing) Analog Interface Analog Output D/A output Update Rate Signaling Level Connector 10 TTL levels 30 Hz ( “1” ) 3.5 5.0 VDC ( “0” ) -0.3 1.5 VDC In-Line 4-Pin Block (0.1” spacing) Physical Dimensions Weight Circuit Board Assembly 40.0 x 80.0 x (including connectors) 12.0 HMR4007 16.5 mm grams Environment Temperature Operating -40 - +70 °C Storage -55 +125 Note 1: A magnet of sufficient strength must be used to maintain a magnetic field strength of 35 gauss (min.) at the sensor array and an apparent magnet length of 23 mm. Note 2: Sensor boards are factory calibrated in the axial mode using a 27mm length cylindrical magnet. Operation in the radial mode must be digitally reconfigured by the user. Solid State Electronics Center • www.magneticsensors.com • (800) 323-8295 • Page 2 HMR4007 SENSOR PRODUCTS PIN CONFIGURATION Pin Number Pin Name Description Digital Interface 1 2 3 4 5 6 RTS Data_Out Data_In CTS Power GND Serial Clock Output Serial Data Output Serial Data Input Serial Clock Input Unregulated Power Input (+6 to +28 VDC) (see note 1) Power and Signal Ground Analog Interface 1 2 3 4 Power Analog Out Position Valid GND Unregulated Power Input (+6 to +28 VDC) (see note 1) 0 - 2.5 VDC analog output TTL level (0 = position invalid, 1 = position valid) Power and Signal Ground Jumper Block #1 2-5 Note 1 Analog Output port selected as power source 3-6 Note 1 Serial Communications port selected as power source Note 1: The board contains three interface connectors for digital and/or analog communications. Power is supplied to the board through any one of these connectors and is selected by jumper block #1. Only ONE of the three positions on JP1 should be shorted at a time. Shorting more than one may result in excessive power supply currents and board damage. CIRCUIT DESCRIPTION The HMR4007 Linear Position Sensor circuit board includes all of the basic sensors and electronics to provide a digital indication of position of a target magnet. The HMR4007 starts with an array of seven Honeywell HMC1501 single axis magnetoresistive (MR) sensors to determine the field geometry and direction of a target magnet attached to the moving part of a device under test. These sensors are supplied power by a constant voltage source, and the use of an array of sensors helps to maintain accuracy over temperature and run-out. The sensor outputs are routed to a multiplexed Analog to Digital Converter (ADC) integrated circuit. A microcontroller integrated circuit periodically queries the multiplexed ADC and performs sensor offset and gain corrections and computes the position of the target magnet as a function of the distance of travel along the long axis of the sensor board. The position data, along with an error bit, is available thought the serial interface or is present on the Digital to Analog Converter (DAC) output port. The serial interface is not needed in order to use the board’s stand-alone analog output. The microcontroller also performs the external serial data interface and other housekeeping functions. An onboard EEPROM integrated circuit is employed as a nonvolatile storage to retain necessary data and configuration variables for best performance. The HMR4007 uses an on-board low drop out (LDO) +5 volt regulator so that a regulated +5 volt power supply or an unregulated power supply in the range of +6VDC to +28VDC can be used. The power is supplied to the board through one of the three user ports being (serial, analog, or USB) and a jumper is used to select which port is the power source. Only one jumper should be in place at any one time as the board does not have over current protection and use of more than one jumper can result in excessive power supply currents and board damage. PHYSICAL CHARACTERISTICS The circuit board for the HMR4007 Linear Position Sensor is approximately 340mm by 80mm. A 6-pin right angle connector (J1) and two 4-pin connectors (J2, J3) protrude from the back of the board for user connections. Components on the top-side have a maximum height of 12mm. Figure 1 shows a typical circuit board with dimensions. Solid State Electronics Center • www.magneticsensors.com • (800) 323-8295 • Page 3 HMR4007 SENSOR PRODUCTS Parts Placement x x x x x x 1 2 3 JP1 Not used leave all OPEN Where 1= J3 (USB) 2= J2 (Analog output) 3 =J1(digital communications) - shown above 4 5 6 1 2 3 4 5 6 1 2 3 Sensed axis 4 3 2 1 4-40NF mounting holes (connected to ground plane) 6 5 4 3 2 1 USB port not used Sens or Board J2 pin uP pin 1 Vcc 2 RA4 3 4 D/A Output GND function pow er input (5 -2 8 VDC) status (TTL output) Logic 0 = output not valid Logic 1 = output valid ana log output (0 - 2 .2 5 V) pow er ground PC (paralle l port) LPT bit LPT pin S3 15 S4 13 D1 3 D0 2 19 < < > > < > < > Se ns or Board J1 pin uP bit 1 RA3 2 RA2 3 RA1 4 RA0 5 Vcc 6 GND function Tx_CLK Tx Rx Rx_CLK + 5 -2 8 VDC pow er gnd color (gray) (ye llow ) (blue) (w hit e) (re d) (black) Sx = s ta tus (LPT port bas e addres s + 1 , Bit x) Dx = data (LPT port bas e addres s + 0 , Bit x) Figure 1 – Sensor board layout and connector pin designations Mating Parts Connectors J1, J2, and J3 mate with GC/Waldom C-Grid• crimp-style shells and terminals. Polarized shells (with a locking tab) or unpolarized shells are available. The applicable GC/Waldom part numbers are: Connector J1 J2 J3 pins 6 4 4 Polarized shell 50-57-9406 50-57-9404 50-57-9404 Unpolarized shell 50-57-9006 50-57-9004 50-57-9004 Crimp terminals 16-02-0097 16-02-0097 16-02-0097 Ordering Information Ordering Number HMR4007 Product 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. 900289 01-03 Rev. A Solid State Electronics Center • www.magneticsensors.com • (800) 323-8295 • Page 4