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CSA-1V Current Sensor
Sentron CSA-1V
Revised Jan 2005
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 mag netic 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.
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Package: Pin Out: B 1 2 3 4 5 6 7 8 A_OUT, analog sensor output VDD pos. supply voltage Not connected 1) PV, programming voltage GND, supply common 1) PD, programming data 1) PC, programming clock CO_OUT, common output SOIC-8
Note 1: Used for factory programming
Manufactured by: Sentron AG (A Melexis Company) • Baarerstrasse 73 • 6300 Zug • Switzerland • Tel: +41 (41) 711
2170 • Fax: +41 (41) 711 2188 www.sentron.ch •
[email protected] •
1
GMW Associates. 955 Industrial Rd, San Carlos, CA 94070 www.gmw.com. Tel: (650) 802-8292. Fax: (650) 802-8298. Email
[email protected]
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Absolute Maximum Ratings
Symbol VSUP T Parameter Supply Voltage Ambient Temperature Min. 0 -40 Typ. Max. 6 +150 Unit V o C
Sentron CSA-1V
Revised Jan 2005
Remarks
Recommended Operating Conditions
Symbol VSUP I OUT 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=-40°C to 150°C, VSUP =4.5V to 5.5V if not otherwise specified. Symbol I SUP VCommon BW tR Parameter Supply Current Common (reference) 2) Output Voltage Bandwidth: DC to Response Time Min. VSUP/2 -20mV Typ. 11 VSUP /2 100 6 Max. 16 VSUP/2 +20mV Unit mA Test Conditions I OUT =0mA kHz µs
Note 2: Ratiometric (proportional to VSUP )
Characteristics of the Linear Magnetic Field Sensor 3,4)
With VSUP = 5V and in the temperature range -40 C to 150 C, if not otherwise specified. Symbol S ∆S/S∆T Voff Boff D Voff/D T BFS BL NL ∆Bnoise Parameter 3) Magnetic Sensitivity Magn. Sensitivity Temperature Drift 3) Offset Voltage Equivalent Magnetic Offset
3) o o
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Min. 270 0.02 -15 -50 -0.2 -7.5 -5
Typ. 6) 280
Max. 290 0.02 15 50 0.2 7.5 5
Unit V/T %/°C mV mT mV/°C mT mT % nT/ √H z
0 0 0
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Offset Temperature Drift Full Scale Magnetic Field 5) Range Linear Magnetic Field Range Non Linearity
Input referred magnetic noise spectrum density (RMS)
Test Conditions B = BL I OUT =0mA T=-20°C to 125°C B=0T, Iout=0mA, T=20°C B=0T, IOUT =0mA T=-20°C to 80°C B=0T, IOUT =0mA, T=-20°C to 125°C
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0.1 0.5
0.2 1 125
B = BL B = BFS f=10Hz to 10kHz
Note 3: Ratiometric (proportional to V SUP ) Note 4: When the analog output pin A_OUT is used in differential mode (ie Vout = A_OUT – CO_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+/- V/T Manufactured by: Sentron AG (A Melexis Company) • Baarerstrasse 73 • 6300 Zug • Switzerland • Tel: +41 (41) 711
2170 • Fax: +41 (41) 711 2188 www.sentron.ch •
[email protected] •
2
GMW Associates. 955 Industrial Rd, San Carlos, CA 94070 www.gmw.com. Tel: (650) 802-8292. Fax: (650) 802-8298. Email
[email protected]
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Block Diagram
Sentron CSA-1V
Revised Jan 2005
Fig. 1
Block diagram of CSA -1V For reliable operation within the specifications the sensor must be connected as follows:
IMPORTANT
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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)
V SUP
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CSA-1V 1 A_Out 2 Vdd 3 n.c. 4 PV 100nF* GND
*
CO_OUT 8 PC 7 PD 6 GND 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 CSA-1V 3
Manufactured by: Sentron AG (A Melexis Company) • Baarerstrasse 73 • 6300 Zug • Switzerland • Tel: +41 (41) 711
2170 • Fax: +41 (41) 711 2188 www.sentron.ch •
[email protected] •
GMW Associates. 955 Industrial Rd, San Carlos, CA 94070 www.gmw.com. .