CSA-1V ETC2

Document overview

  • Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
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Technical content

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 th e Hall effect. The circuit is fabricated using a conve ntional CMOS techn ology with a n a dditional ferromagn etic l ayer. Th e 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: SOIC-8 Pin Out:

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

B Note 1: Used for factory programming 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

Symbol Parameter Min. Typ. Max. Unit Remarks VSUP Supply Voltage 0 6 V T Ambient Temperature -40 +150 oC Recommended Operating Conditions Symbol Parameter Min. Typ. Max. Unit Remarks VSUP Supply Voltage 4.5 5 5.5 V IOUT Output Current -1 1 mA CL Load Capacitance 1000 pF

Electrical Characteristics

At T=-40°C to 150°C, VSUP=4.5V to 5.5V if not otherwise specified. Symbol Parameter Min. Typ. Max. Unit Test Conditions ISUP Supply Current 11 16 mA VCommon Common (reference) Output Voltage2) VSUP/2 -20mV VSUP/2 VSUP/2 +20mV IOUT=0mA BW Bandwidth: DC to 100 kHz tR Response Time 6 µs 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 Parameter Min. Typ. Max. Unit Test Conditions S Magnetic Sensitivity 3) 270 300 330 V/T B = BL ∆S/S∆T Magn. Sensitivity Temperature Drift -0.02 0.02 %/°C IOUT=0mA T=-20°C to 125°C Voff Offset Voltage -15 0 15 mV B=0T, Iout=0mA, T=20°C ∆Voff/∆T Offset Temperature Drift -0.2 0 0.2 mV/°C B=0T, IOUT=0mA, T=-20°C to 125°C BFS Full Scale Magnetic Field Range 5) -7.5 7.5 mT BL Linear Magnetic Field Range -5 5 mT 0.1 0.2 B = BLNL Non Linearity 0.5 1 % B = BFS ∆Bnoise Input referred magnetic noise spectrum density (RMS) 125 nT/√Hz 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_OUT-CO_OUT) Note 5: Device saturates for B>BFS, but is not damaged 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

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)

1 A_Out

2 Vdd

3 n.c. 4 PV CO_OUT 8 PC 7 PD 6 GND 5 GND VSUP GND 100nF* CSA-1V 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 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

Package Information SOIC-8 0.018 (0.45) B B: Magnetic sensitive direction Fig. 3 Package information and magnetic sensitive direction Dimension and Pads CSA-1V in dice form (all dimensions in µm) 1900 1900 VDD A_OUT PD PC CO_OUT GND PV B Fig. 4 Dimensions of dice 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

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=300V/T Max current [A] Distance sensor to wire [mm] Sensitivity [mV/A] Approx. Resolution (raw) [A] Approx. Resolution (tINT=1ms) [A] Linearity Error [%] 10 0.2 120 0.1 0.01 50 2 25 0.5 0.05 100 4 12 1 0.1 500 20 3 3.5 0.35 1000 40 1.5 7 0.7 <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] DC / pulsed No of tracks under sensor Sensitivity [mV/A] Resolution (raw) [mA] Resolution tINT=1ms [mA] Linearity Error [%] 2 / 10 4 140 70 7 10 / 50 1 35 280 28 <0.1 (*) max current depends on PCB properties/thermal budget Please contact us for documentation such as application notes, technical papers and others. 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