2SA-10

2SA-10 November 2004 2SA-10 Integrated 2-Axis Hall Sensor Features • • • • • • • • Measures two components of a magnetic field at the same spot. Excellent matching of sensitivity along the two axes. Max. angle error from –40°C ..+125°C: < 1° Very high sensitivity Low quiescent current Fabricated in standard CMOS technology Very low hysteresis Surface mount SOIC-8 package Applications • • • • • • • 2-D position sensing Contactless potentiometer Angular position sensor for micro motors Miniaturized contactless encoder Contactless rotary switch 2-D magnetic field mapping Joystick General Description Sentron’s new magnetic angular sensor 2SA-10 detects the absolute angular position of a small magnet that is positioned above the device surface. The 2SA-10 is an integrated combination of a CMOS Hall circuit and a thin ferromagnetic disk. The CMOS circuit contains two pairs of Hall-elements for each of the two directions parallel with the chip surface X and Y. The ferromagnetic disk amplifies the external magnetic field and concentrates it on the Hall elements. The 2SA-10 is ideally suited for rotary position sensing in harsh automotive and industrial environments. It produces two linear, ratio-metric output voltages proportional to the sine and the cosine function of the angle of the applied magnetic field parallel to the chip surface. The circuit is fabricated using a standard CMOS process and the ferromagnetic disk is added in a simple post-processing step. The monolithic device incorporates Hall elements, offset cancellation circuitry, current source, chopper stabilized amplification circuitry, parameter programming capability. By dynamic offset cancellation any offset voltage caused by temperature variations, packaging stress or others is strongly reduced. As a result, the device has an extremely stable signal output, is immune to mechanical stress and is virtually immune to temperature cycling. Therefore, the circuit features a wide application range and very high accuracy. Page 1 of 8 Sentron AG • Baarerstrasse 73 • 6300 Zug • Switzerland • Tel: +41 (41) 711 2170 • Fax: +41 (41) 711 2188 www.sentron.ch • sales@sentron.ch • for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • sales@gmw.com 2SA-10 November 2004 Package: Pin-out: SOIC-8 1 2 3 4 5 6 7 8 CO_OUT, common output PC, programming clock1) VDD, Supply voltage Y_OUT, Y-channel analog output X_OUT, X-channel analog output PD, programming data1) PV, programming voltage1) GND, Supply common Bx By Note 1: Used for factory programming Absolute Maximum Ratings Symbol VSUP T Parameter Supply Voltage Ambient Temperature Min. 0 -40 Max. 6 +125 Unit V o Remarks C Magnetic Input Conditions Symbol BMAX D fc ω 2) Parameter Max. Induction Diameter of magnetic disk angular speed Min. Max. >1000 0.2 100’000 Unit mT mm rpm Remarks Device saturates,but is not damaged See Figure 5 for location of disk Note 2: At center of magnetic disc Recommended Operating Conditions Symbol VSUP IOUT CL B 3) Parameter Supply Voltage Output Current Load Capacitance Magnetic Field Min. 4.5 -1 Typ. 5 Max. 5.5 1 1000 80 Unit V mA pF mT Remarks Note 3: At center of magnetic disc Page 2 of 8 Sentron AG • Baarerstrasse 73 • 6300 Zug • Switzerland • Tel: +41 (41) 711 2170 • Fax: +41 (41) 711 2188 www.sentron.ch • sales@sentron.ch • for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • sales@gmw.com 2SA-10 November 2004 Electrical Characteristics At T=-40°C to 150°C, VSUP=4.5V to 5.5V if not otherwise specified. Symbol Parameter Min. Typ. Max. ISUP CO_OUT BW Supply Current Common (reference) Output Voltage 4) Bandwidth: DC to VSUP/2 -20mV 10 16 VSUP/2 15 18 VSUP/2 +20mV 18 kHz Unit mA IOUT=0mA Test conditions Note 4: Ratio-metric (proportional to VSUP ) Analog Output-Characteristics 5,6) Magnetic Sensitivity 6) Magnetic Sensitivity Temperature drift Magnetic Sensitivity mismatch (X-Y) 6) Phase matching Offset Voltage With VSUP= 5V and in the temperature range -40oC to 150oC, if not otherwise specified. Symbol Parameter Min. Typ. Max. Unit Test conditions S ∆S/S∆T Sx/Sy ∠Sx-Sy Voff 40 -0.05 0 -0.3 -10 0 0 50 60 0.05 2 0.3 10 V/T %/°C % ° mV IOUT=0mA T=-40°C to 150°C B = BL 7) B = BL 7) B=0T 7), IOUT=0mA T=-20°C to 80°C B=0T 7), IOUT=0mA ∆Voff/∆T BFS 7,8) BL 7,8) NL ∆Bnoise 7) Offset Voltage Temperature drift Full Scale Magnetic Field Range Linear Magnetic Field Range Non Linearity Input referred magnetic noise spectrum density (RMS) Max. full scale output voltage Max. full scale output voltage Maximum Hysteresis -0.05 -45 -40 0.1 0.5 0.05 45 40 0.2 1 750 mV/°C mT mT % % nT/ Hz V V % BFS For B ≤ BL 7) For B ≤ BFS 7) BW=1Hz to 10kHz X_OUT max Y_OUT max Hys max 5% VSUP 5% VSUP 95% VSUP 95% VSUP 0.03 |B| ≥ 50mT |B| ≥ 50mT |B| ≥ BMAX Note 5: When the analog output pins X_OUT and Y_OUT are used in differential mode (i.e. Vx=X_OUT-CO_OUT) Note 6: Ratio-metric (proportional to VSUP ) Note 7: At center of magnetic disk Note 8: The 2SA-10 can also be ordered with Sensitivity of 25V/T for BL=60mT and BFS=80mT Page 3 of 8 Sentron AG • Baarerstrasse 73 • 6300 Zug • Switzerland • Tel: +41 (41) 711 2170 • Fax: +41 (41) 711 2188 www.sentron.ch • sales@sentron.ch • for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • sales@gmw.com 2SA-10 November 2004 Block Diagram 2SA-10 Fig. 1 Block Diagram 2SA-10 Connection Diagram 2SA-10 IMPORTANT For reliable operation within the specifications the sensor must be connected as follows: Connect Pin 6 (PD) to Pin 8 (GND) Connect Pin 2 (PC) to Pin 3 (Vdd) Connect Pin 7 (PV) to Pin 3 (Vdd) Put a 100nF capacitor close to the chip between Pin 3 (Vdd) and Pin 8 (GND) VSUP 2SA-10 1 CO_Out 2 PC 3 Vdd 100nF* 4 Y_Out GND * GND 8 PV 7 PD 6 X_Out 5 GND If the supply voltage is disturbed by EMI it can be useful to place a second capacitor (100pF, ceramic) parallel to the 100nF capacitor. Fig. 2 Connection diagram of 2SA-10 Page 4 of 8 Sentron AG • Baarerstrasse 73 • 6300 Zug • Switzerland • Tel: +41 (41) 711 2170 • Fax: +41 (41) 711 2188 www.sentron.ch • sales@sentron.ch • for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • sales@gmw.com 2SA-10 November 2004 Package dimensions SOIC-8 Bx, By : Magnetic sensitive directions Bx By Fig. 3 Package dimensions and magnetic sensitive directions Dimension and Pads 2SA-10 in dice form (all dimensions in µm) 2800 VDD PC Y_OUT 1900 Bx CO_OUT By By X_OUT Bx GND PV PD Fig. 4 2SA-10 dimensions of dice Page 5 of 8 Sentron AG • Baarerstrasse 73 • 6300 Zug • Switzerland • Tel: +41 (41) 711 2170 • Fax: +41 (41) 711 2188 www.sentron.ch • sales@sentron.ch • for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • sales@gmw.com 2SA-10 November 2004 Location of Disk ` 2.0mm 2.5 mm 0.8mm Fig. 5 2SA-10 location of disk Page 6 of 8 Sentron AG • Baarerstrasse 73 • 6300 Zug • Switzerland • Tel: +41 (41) 711 2170 • Fax: +41 (41) 711 2188 www.sentron.ch • sales@sentron.ch • for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • sales@gmw.com 2SA-10 November 2004 Applications The unique integrated two-axis Hall-sensor offers a rugged, low cost solution for any rotational reference detection. Application examples are found in contactless angular sensors and encoders, in rotational switches, in brushless dc motors and in joysticks The 2SA-10 is applied in a way very similar to magnetoresistive GMR and AMR angular sensors by sensing the rotation of a magnetic field component parallel with the chip. However, the full integration of magnetic field sensor and programmable signal conditioning circuit of the 2SA-10 offers an exceptional cost effectiveness. Sentron’s 2SA-10 combines the advantage of a miniaturized angular sensor solution and simultaneously higher product performance and reliability. The features of high sensitivity, low offset and low temperature drift meets even the most demanding requirements across many industries. Absolute Angle Sensor The 2SA-10 is positioned under a rotating magnet mounted at the shaft end of a rotating axis. The magnet is magnetized diametrically, so that by rotating the shaft the field through the sensor also rotates. The generated voltages Vx and Vy of the 2SA-10 represent the sine and cosine of the magnetic field direction. Even though the signal amplitudes depend upon the vertical distance between sensor and magnet, the angle information, which is calculated by the ratio of Vx and Vy is not depending on this value. In this manner the angle sensor is very robust towards sensitivity temperature drift, magnet temperature drift and ageing effects as well as assembly tolerances. Angular Position Sensor 5 4 Sensor Output Voltages [V] 3 V x (t) = V 0 * s in(w *t) V y (t) = V 0 * c os (w *t) 2 1 0 0 60 120 180 Angle [°] 240 300 360 Page 7 of 8 Sentron AG • Baarerstrasse 73 • 6300 Zug • Switzerland • Tel: +41 (41) 711 2170 • Fax: +41 (41) 711 2188 www.sentron.ch • sales@sentron.ch • for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • sales@gmw.com 2SA-10 November 2004 Linear Position Sensor The 2SA-10 is positioned in the vicinity underneath a small permanent magnet with round shape. The magnetization axis of the magnet is perpendicular to the sensor plane. When the magnet moves parallel to the plane, the magnetic field at the sensor rotates. The output signal Vx of the 2SA-10 behaves like X*B/r^2 and the output signal Vy like Y*B/r^2 with X and Y being the coordinates of the magnet with respect to the sensor, B being the field strength at the sensor and r being the distance between magnet and sensor. If the magnet now moves parallel to the x-axis, the coordinate Y is constant and the ratio Vx/Vy = X/const. is a very linear measure of the position of the magnet. Using a second 2SA-10 sensor the principle can be extended to very linear two-dimensional position sensing. Output Signals X- and Y-Axis 0.20 0.15 1.50 1.00 0.50 0.00 -0.50 Vx X/ Y Vy Linear (X/ Y) Output voltage [mV] 0.05 0.00 -0.05 -0.10 -3.00 -1.00 -1.50 3.00 -2.00 -1.00 0.00 1.00 2.00 displacement X [mm] Position Sensor / Joystick The 2SA-10 is positioned in the rotation center of a joystick control handle, which holds a permanent magnet at its lower end. In centered position the field emanating from the magnet is exactly perpendicular to the chip surface and the sensor output is zero for X and Y. As soon as the stick is inclined, the sensor output becomes positive or negative on X and Y. The output signal is linear with the inclination angle for a range of about ± 30° of inclination Please contact us for documentation such as application notes, technical papers and others. Page 8 of 8 Sentron AG • Baarerstrasse 73 • 6300 Zug • Switzerland • Tel: +41 (41) 711 2170 • Fax: +41 (41) 711 2188 www.sentron.ch • sales@sentron.ch • for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • sales@gmw.com ratio Vx/Vy 0.10