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| CSA-1V August 2004 CSA-1V Current Sensor Features: * Sensitive to a magnetic field parallel to the chip surface * Very high sensitivity * Linear output voltage proportional to a magnetic field * Wide-band: DC to 100kHz * Very low offset and offset-drift * Very low noise * Isolated from current conductor * Surface mount SOIC-8 package Applications: * AC and/or DC current measurement * Wide-Band Magnetic Field Measurement * Battery Chargers * AC-DC Converters * Motor Control General Description The CSA-1V is a single-axis integrated magnetic field sensor based on the Hall effect. The circuit is fabricated using a conventional CMOS technology with an additional ferromagnetic layer. The ferromagnetic layer is used as a magnetic flux concentrator providing a high magnetic gain. Therefore, the circuit features very high magnetic sensitivity, low offset, and low noise. The CSA-1V is packaged in a standard SOIC-8 full plastic package. This package provides: * highest isolation for applications with the current conductor on the PCB (up to 600V) * highest sensitivity for applications with the current lead above the chip. Package: Pin Out: B SOIC-8 1 2 3 4 5 6 7 8 A_OUT, analog sensor output VDD pos. supply voltage Not connected PV, programming voltage 1) GND, supply common PD, programming data 1) PC, programming clock 1) CO_OUT, common output Note 1: Used for factory programming Page 1 of 5 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 CSA-1V August 2004 Absolute Maximum Ratings Symbol VSUP T Parameter Supply Voltage Ambient Temperature Min. 0 -40 Typ. Max. 6 +150 Unit V o C Remarks Recommended Operating Conditions Symbol VSUP IOUT CL Parameter Supply Voltage Output Current Load Capacitance Min. 4.5 -1 Typ. 5 Max. 5.5 1 1000 Unit V mA pF Remarks Electrical Characteristics At T=-40C to 150C, VSUP=4.5V to 5.5V if not otherwise specified. Symbol ISUP VCommon BW tR Parameter Supply Current Common (reference) Output Voltage2) Bandwidth: DC to Response Time Min. VSUP/2 -20mV Typ. 11 VSUP/2 100 6 Max. 16 VSUP/2 +20mV Unit mA Test Conditions IOUT=0mA kHz s Note 2: Ratiometric (proportional to VSUP) Characteristics of the Linear Magnetic Field Sensor 3,4) With VSUP= 5V and in the temperature range -40oC to 150oC, if not otherwise specified. Symbol S S/ST Voff Voff/T BFS BL NL Bnoise Parameter Magnetic Sensitivity 3) Magn. Sensitivity Temperature Drift Offset Voltage Offset Temperature Drift Full Scale Magnetic Field Range 5) Linear Magnetic Field Range Non Linearity Input referred magnetic noise spectrum density (RMS) Min. 270 -0.02 -15 -0.2 -7.5 -5 0.1 0.5 0 0 Typ. 300 Max. 330 0.02 15 0.2 7.5 5 0.2 1 125 Unit V/T %/C mV mV/C mT mT % nT/Hz B = BL B = BFS f=10Hz to 10kHz Test Conditions B = BL IOUT=0mA T=-20C to 125C B=0T, Iout=0mA, T=20C B=0T, IOUT=0mA, T=-20C to 125C Note 3: Ratiometric (proportional to VSUP ) Note 4: When the analog output pin A_OUT is used in differential mode (i.e. Vout=A_OUT-CO_OUT) Note 5: Device saturates for B>BFS, but is not damaged Page 2 of 5 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 CSA-1V August 2004 Block Diagram Fig. 1 Block diagram of CSA-1V IMPORTANT For reliable operation within the specifications the sensor must be connected as follows: Connect Pin 6 (PD) to Pin 5 (GND) Connect Pin 7 (PC) to Pin 2 (Vdd) Connect Pin 4 (PV) to Pin 2 (Vdd) Put a 100nF capacitor close to the chip between Pin 2 (Vdd) and Pin 5 (GND) VSUP CSA-1V 1 A_Out 2 Vdd 3 n.c. 4 PV 100nF * CO_OUT 8 PC 7 PD 6 GND 5 GND 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 CSA-1V Page 3 of 5 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 CSA-1V August 2004 Package Information SOIC-8 B: Magnetic sensitive direction B 0.018 (0.45) Fig. 3 Package information and magnetic sensitive direction Dimension and Pads CSA-1V in dice form (all dimensions in m) 1900 VDD 1900 B A_OUT PV GND PD PC CO_OUT Fig. 4 Dimensions of dice Page 4 of 5 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 CSA-1V August 2004 Typical Applications Current Measurement A The current conductor is situated above the chip. A current conductor is placed at a certain distance above or beyond the chip. The magnetic field around a long current wire is described by H=I/2r. The flux density at the place of the sensor depends upon the current in the wire I and the distance between sensor and wire r: B= 0*I/2 r. All examples for S=300V/T Max current [A] 10 50 100 500 1000 Distance sensor to wire [mm] 0.2 2 4 20 40 Sensitivity [mV/A] 120 25 12 3 1.5 Approx. Resolution (raw) [A] 0.1 0.5 1 3.5 7 Approx. Resolution (tINT=1ms) [A] 0.01 0.05 0.1 0.35 0.7 Linearity Error [%] <0.1 Current Measurement B The current conductor is situated below the chip (on PCB). The CSA-1V current sensor is placed on a PCB directly over the current track. The current track can consist of one or several loops, depending on the maximum current to be measured. The sensor measures the magnetic field emanating from the current flowing through the tracks. Typically obtained values for for this type of application are (width of PCB current track 2.5mm): Max current(*) [A] No of tracks Sensitivity Resolution DC / pulsed under sensor [mV/A] (raw) [mA] 2 / 10 4 140 70 10 / 50 1 35 280 (*) max current depends on PCB properties/thermal budget Resolution tINT=1ms [mA] 7 28 Linearity Error [%] <0.1 Please contact us for documentation such as application notes, technical papers and others. Page 5 of 5 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 |
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