CSA1V Rev. 002 April 2005 CSA1V Current Sensor Features: · Sensitive to a magnetic field parallel to the chip surface · Very high sensitivity · Linear output voltage proportional to a magnetic field · Wideband: DC to 100kHz · Very low offset and offsetdrift · Very low noise · Isolated from current conductor · Surface mount SOIC8 package Applications: · AC and/or DC current measurement · WideBand Magnetic Field Measurement · Battery Chargers · ACDC Converters · Motor Control General Description The CSA1V is a singleaxis 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 CSA1V is packaged in a standard SOIC8 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. Please find the latest version of this datasheet and related information such as application notes on our website www.sentron.ch Package: SOIC8 Pin Out: B 1 A_OUT, analog sensor output 2 VDD pos. supply voltage 3 Not connected 4 PV, programming voltage 1) 5 GND, supply common 6 PD, programming data 1) 7 PC, programming clock 1) 8 CO_OUT, common output Note 1: Used for factory programming Page 1 of 6 Sentron AG · Baarerstrasse 73 · 6300 Zug · Switzerland · Tel: +41 41 711 2170 · Fax: +41 41 711 2188 www.sentron.ch · www.melexis.com · [email protected] for North America: GMW Associates · Tel: +1 (650) 8028292 · Fax: +1 (650) 8028298 · [email protected] CSA1V Rev. 002 April 2005 Absolute Maximum Ratings Symbol VSUP T Parameter Supply Voltage Ambient Temperature Min. 0 40 Typ. Max. 6 +125 Unit V o C Remarks Min. Typ. Max. Unit Remarks 4.5 1 5 5.5 1 1000 V mA pF Recommended Operating Conditions Symbol VSUP IOUT CL Parameter Supply Voltage Output Current Load Capacitance Electrical Characteristics At T=40°C to 125°C, VSUP=4.5V to 5.5V if not otherwise specified. Symbol ISUP VCommon BW tR Parameter Supply Current Common (reference) Output Voltage 2) Bandwidth: DC to Response Time Min. VSUP/2 20mV Typ. 11 VSUP/2 100 Max. Unit 16 mA VSUP/2 +20mV kHz 6 μs Test Conditions IOUT=0mA Note 2: Ratiometric (proportional to VSUP) Characteristics of the Linear Magnetic Field Sensor 3,4) With VSUP= 5V and in the temperature range 40 o C to 125 o C, if not otherwise specified. Symbol S DS/SDT Voff Parameter Magnetic Sensitivity 3) Magn. Sensitivity Temperature Drift Offset Voltage DVoff/DT Offset Temperature Drift BFS BL Full Scale Magnetic Field Range 5) Linear Magnetic Field Range NL Non Linearity DBnoise Input referred magnetic noise spectrum density (RMS) Min. 270 Typ. 280 6) 0.02 Max. 290 Unit V/T 0.02 %/°C 15 0 15 mV 0.2 0 0.2 mV/°C 7.5 7.5 mT 5 5 0.2 1 mT 125 nT/ÖHz 0.1 0.5 % Test Conditions B = BL IOUT=0mA T=20°C to 125°C B=0T, Iout=0mA, T=20°C B=0T, IOUT=0mA, T=20°C to 125°C B = BL B = BFS f=10Hz to 10kHz Note 3: Ratiometric (proportional to VSUP ) Note 4: When the analog output pin A_OUT is used in differential mode (i.e. Vout=A_OUTCO_OUT) Note 5: Device saturates for B>BFS, but is not damaged Note 6: Specification correction: Was 300 ±10 V/T. Now 280 ±10 V/T. All parts manufactured to date, have been calibrated to 280 ±10V/T Sentron AG reserves the right to make changes without further notice to any products herein to improve reliability, function, or design. Sentron does not assume any liability arising from the use of any product or application of any product or circuit described herein. Page 2 of 6 Sentron AG · Baarerstrasse 73 · 6300 Zug · Switzerland · Tel: +41 41 711 2170 · Fax: +41 41 711 2188 www.sentron.ch · www.melexis.com · [email protected] for North America: GMW Associates · Tel: +1 (650) 8028292 · Fax: +1 (650) 8028298 · [email protected] CSA1V Rev. 002 April 2005 Block Diagram Fig. 1 Block diagram of CSA1V 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) CSA1V 1 A_Out VSUP Output CO_OUT 8 2 Vdd PC 7 3 n.c. PD 6 4 PV GND 5 GND 100nF 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 CSA1V Page 3 of 6 Sentron AG · Baarerstrasse 73 · 6300 Zug · Switzerland · Tel: +41 41 711 2170 · Fax: +41 41 711 2188 www.sentron.ch · www.melexis.com · [email protected] for North America: GMW Associates · Tel: +1 (650) 8028292 · Fax: +1 (650) 8028298 · [email protected] CSA1V Rev. 002 April 2005 Package Information SOIC8 B: Magnetic sensitive direction B 0.018 (0.45) Fig. 3 Package information and magnetic sensitive direction Package versions Leaded (standard): CSA1V Material: C151, 85/15 Lead free ‘green’: CSA1VG Material: CDA151, Pb <100ppm Page 4 of 6 Sentron AG · Baarerstrasse 73 · 6300 Zug · Switzerland · Tel: +41 41 711 2170 · Fax: +41 41 711 2188 www.sentron.ch · www.melexis.com · [email protected] for North America: GMW Associates · Tel: +1 (650) 8028292 · Fax: +1 (650) 8028298 · [email protected] CSA1V Rev. 002 April 2005 Typical Applications Busbar Current Measurement 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/2πr. 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= μ0*I/2 πr. All examples for S=280V/T Max current [A] Distance sensor to wire [mm] Sensitivity [mV/A] 10 50 100 500 1000 0.2 2 4 20 40 120 25 12 3 1.5 Approx. Approx. Resolution Resolution (raw) [A] (tINT=1ms) [A] 0.1 0.01 0.5 0.05 1 0.1 3.5 0.35 7 0.7 Linearity Error [%] <0.1 PCB Current Measurement The current conductor is situated below the chip (on PCB). The CSA1V 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 6 Sentron AG · Baarerstrasse 73 · 6300 Zug · Switzerland · Tel: +41 41 711 2170 · Fax: +41 41 711 2188 www.sentron.ch · www.melexis.com · [email protected] for North America: GMW Associates · Tel: +1 (650) 8028292 · Fax: +1 (650) 8028298 · [email protected] CSA1V Rev. 002 April 2005 This document is published by: Sentron AG Baarerstrasse 73 6300 Zug Switzerland Phone: +41 41 711 2170 Fax: +41 41 711 2188 Please visit our website for the latest version of this document: www.sentron.ch Technical Support: www.sentron.ch [email protected] Commercial Support: www.melexis.com [email protected] North America: www.gmw.com [email protected] IMPORTANT NOTICE / DISCLAIMER Devices sold by Sentron are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Sentron makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Sentron reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with Sentron for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical lifesupport or lifesustaining equipment are specifically not recommended without additional processing by Sentron for each application. The information furnished by Sentron is believed to be correct and accurate. However, Sentron shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of Sentron’s rendering of technical or other services. © 2005 Sentron AG. All rights reserved. Page 6 of 6 Sentron AG · Baarerstrasse 73 · 6300 Zug · Switzerland · Tel: +41 41 711 2170 · Fax: +41 41 711 2188 www.sentron.ch · www.melexis.com · [email protected] for North America: GMW Associates · Tel: +1 (650) 8028292 · Fax: +1 (650) 8028298 · [email protected]