MLX90224A

  
      s s s s s s Chopper Stabilized Amplifier Stage CMOS for Optimum Stability, Quality and Cost Dual Output 4.5V to 28V Operation Phase/Direction Detection (B) Pulse Doubling Output (C)    s s s s Direction Detector Speed Sensor Shaft Encoding Position Sensing    Part No. MLX90224 A MLX90224 B MLX90224 C Temperature Suffix L L L Package VA VA VA Temperature Range -40oC to 150oC Automotive -40oC to 150oC Automotive -40oC to 150oC Automotive  
 1 V oltage Regulator V DD
  The MLX90224 series are dual Hall effect latches. It includes two Hall effect latch functions of which typical thresholds are +/- 2.0 mT. In each latch, the magnetic flux detection is performed by a switched silicon Hall plate. The BOP and BRP are temperature-compensated and give a sensitivity temperature coefficient of 500 ppm/oC to compensate popular magnets. The MLX90224 A, C output transistor will be “latched on” (BOP) in the presence of a sufficiently strong South pole magnetic field facing the marked side of the package. Similarly, the output will be “latched off” (BRP) in the presence of a North field. Spacing on the plates is 1.85mm. The MLX90224 B series are designed for direction detection with a high speed chopper which provides 15µs delay. Replaced with Logic for MLX90224 B 2 Chopper OUTPUT 1 4 Chopper OUTPUT 2 3 GND Note: Static sensitive device, please observe ESD precautions. MLX90224 Dual Hall Effect Latch Rev 1.2 8/May/99 Page 1 
  
 
 DC Operating Parameters TA = -40oC to 150oC, VDD = 4.5V to 28V (Unless otherwise specified) !  "         



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   1 2 1    / / / / / / # $1mT=10Gauss Melexis Inc. reserves the right to make changes without further notice to any products herein to improve reliability, function or design. Melexis does not assume any liability arising from the use of any product or application of any product or circuit described herein. MLX90224 Dual Hall Effect Latch Rev 1.2 8/May/99 Page 2 
  
 %  &  Typical Magnetic Switch Points versus Supply Voltage 5 Typical Magnetic Switch Points versus Supply Voltage 50 90224 A, B 90224 C 3 B OP 30 B OP 10 0 -10 B RP -30 Flux Density (mT) 1 0 -1 B RP -3 -5 0 5 10 15 20 25 30 Flux Density (mT) -50 0 5 10 15 20 25 30 Supply Voltage (V) Supply Voltage (V) Typical Supply Current versus Supply Voltage 10 Typical Saturation Voltage versus Temperature V DD = 1 2 V, I OUT = 2 0mA 90224 500 90224 8 400 Supply Current (mA) T A = - 40 oC 6 T A = 2 5 oC T A = 1 25 oC 4 VDS(ON) (mV) 300 V DS(ON) 200 2 100 0 0 5 10 15 20 25 30 0 -40 0 40 80 120 o 160 200 Supply Voltage (V) Temperature ( C) MLX90224 Dual Hall Effect Latch Rev 1.2 8/May/99 Page 3 
  
 %  &  Typical Magnetic Switch Points versus Temperature 5 Typical Magnetic Switch Points versus Temperature 50 90224 A, B 90224 C 3 B OP 30 Flux Density (mT) Flux Density (mT) B OP 10 0 -10 B RP 1 0 -1 B RP -3 -30 -5 -40 0 40 80 120 160 200 -50 -40 0 40 80 120 160 200 Temperature ( o C) Temperature ( o C) Out p ut Volta g e versus Flux Densit y 25 VDD Out p ut Volta g e versus Flux Densit y 90224 A, B 25 VDD 90224 C 20 20 Output Voltage (V) 15 B RP 10 BOP Output Voltage (V) 15 B RP 10 BOP 5 5 V sat 0 -6 -4 -2 0 2 4 6 0 -60 -40 -20 0 20 V sat 40 60 Flux Density (mT) Flux Density (mT) MLX90224 Dual Hall Effect Latch Rev 1.2 8/May/99 Page 4 
  
 %  &  Min/Max Magnetic Switch Range versus Temperature 5 Min/Max Magnetic Switch Range versus Temperature 50 90224 A, B Only 90224 C 3 B OP M a x 30 B OP M a x Flux Density (mT) Flux Density (mT) B OP M i n 10 0 -10 B RP M i n 1 0 -1 B OP M i n B RP M i n B RP M a x -3 -30 B RP M a x -5 -40 0 40 80 120 160 200 -50 -40 0 40 80 120 160 200 Temperature ( o C) Temperature ( o C) Power Dissipation versus Temperature 500 Wave Soldering Parameters All Devices 280 All Devices Package Power Dissipation (mW) 400 260 300 Solder Temperature (oC) VA Package R θJA = 175 oC / W -40 0 40 80 120 160 200 240 200 220 100 200 0 0 5 10 15 20 25 30 Temperature ( o C) Time in Wave Solder (Seconds) MLX90224 Dual Hall Effect Latch Rev 1.2 8/May/99 Page 5 
  
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  The MLX 90224 Speed and Direction Sensor is designed for use with Multipole ring magnet targets having evenly distributed North and South magnetic poles on the circumference of the magnet. An example of the basic physical arrangement of the sensor and magnet is shown in Fig. 1. The MLX90224 is available in 3 versions. The first version will provide the user with two digital output signals. Output S1 will provide a speed pulse from the changing magnetic flux at sensing element S1. Output S2 will provide a phase shifted output identical in pulse width and period to S1. This version is referred to as MLX90224 A. The MLX90224 B version will provide an output signal that decodes the phase shifted signals to directly provide an output for the speed which is twice the natural frequency of the alternating magnetic field from the pole spacing of the multipole ring magnet. The other output pin will represent the direction and will change from logic high to logic low when the direction of rotation of the magnet is reversed. This then allows to directly see the condition of the speed with twice the resolution of the MLX90224 A and to also know directly the direction of rotation of the target. The third version of this product the MLX90224 C will be identical in function of the A but with less sensitive magnetic switch points. The MLX90224 A has Latching magnetic Bop and Brp values of typically +/- 2mT as does the internal circuitry of the B. The C version has also Latching magnetic trip points but with the thresholds set to +/- 25mT. +,   N S N Fig. 1 S N '(     The MLX90224LVA can replace the following Hall effect devices: Allegro A3421KA /A3422KA ) *(
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