Datasheet CSA-1V DownloadLink 5313

CSA-1V
Preliminary
Rev. 004 October 2008
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. It produces a
linear, ratio-metric output voltage proportional to the applied magnetic field parallel with the chip
surface. The circuit is fabricated using a standard CMOS process. The additional ferromagnetic layer
that is added in a simple post-processing step, amplifies the magnetic field and concentrates it on the
Hall elements. 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 and suitable for up to 600V
isolation voltage between the sensor and a conductor on PCB.
Please find the latest version of this datasheet and related information such as application
notes on our website www.sentron.ch
Package:
SOIC-8
Pin Out:
B
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
1)
PD, programming data
PC, programming clock 1)
CO_OUT, common output
Note 1: Used for factory programming
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CSA-1V
Preliminary
Rev. 004 October 2008
Absolute Maximum Ratings
Symbol
VSUP
T
Parameter
Supply Voltage
Ambient Temperature
Min.
0
-40
Typ.
Max.
6
+125
Unit
V
o
C
Remarks
Typ.
5
Max.
5.5
1
1000
Unit
V
mA
pF
Remarks
Recommended Operating Conditions
Symbol
VSUP
IOUT
CL
Parameter
Supply Voltage
Output Current
Load Capacitance
Min.
4.5
-1
Defined by design
Electrical Characteristics
At T=-40°C to 125°C, V
Symbol
ISUP
VCommon
BW
tR
SUP=4.5V
to 5.5V if not otherwise specified.
Parameter
Supply Current
Common (reference)
Output Voltage2)
Bandwidth: DC to
Response Time
Min.
Typ.
11
Max.
16
-50
VSUP/2
+50
Unit
mA
Test Conditions
IOUT=0mA
100
8
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 -40oC to 125oC, if not otherwise specified.
Symbol
Parameter
o
Magnetic Sensitivity at 25 C
Min.
Typ.
Max.
Unit
275
280
285
V/T
S
3) 6)
∆S/S∆T
Magn. Sensitivity
Temperature Drift
Voff
Offset Voltage at 25 C
∆Voff/∆T
Offset Temperature Drift
BFS
Full Scale Magnetic Field
5)
Range
-10
10
mT
BL
Linear Magnetic Field Range
-7.5
7.5
mT
NL
Non Linearity
±0.2
±0.5
%
∆Bnoise
Input referred magnetic noise
spectrum density (RMS)
<125
nT/√Hz
<± 0.02
o
-20
0
%/°C
20
<± 0.2
mV
mV/°C
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_OUT-CO_OUT)
Note 5: Device saturates for B>BFS, but is not damaged
Note 6: The absolute accuracy on magnetic sensitivity trimming is +/- 2%
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
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for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • [email protected]
CSA-1V
Preliminary
Rev. 004 October 2008
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
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 CSA-1V
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CSA-1V
Preliminary
Rev. 004 October 2008
Package Information SOIC-8
B: Magnetic sensitive direction
B
0.018 (0.45)
Fig. 3
Package information and magnetic sensitive direction
Package versions
Leaded (standard): CSA-1V
Material: C151, 85/15
Lead free ‘green’: CSA-1V-G
Material: CDA151, Pb <100ppm
Page 4 of 6
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for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • [email protected]
CSA-1V
Preliminary
Rev. 004 October 2008
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]
Approx.
Resolution
(raw) [A]
10
50
100
500
1000
0.2
2
4
20
40
120
25
12
3
1.5
0.1
0.5
1
3.5
7
Approx.
Resolution
(tINT=1ms)
[A]
0.01
0.05
0.1
0.35
0.7
Typ.
Linearity
Error [%]
<0.2
PCB Current Measurement
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]
2 / 10
4
140
70
10 / 50
1
35
280
(*) max current depends on PCB properties/thermal budget
Resolution
tINT=1ms [mA]
7
28
Typ.
Linearity
Error [%]
<0.2
Please contact us for documentation such as application notes, technical papers and others.
Page 5 of 6
Sentron AG, a Melexis Company • www.melexis.com • [email protected]
for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • [email protected]
CSA-1V
Preliminary
Rev. 004 October 2008
This document is published by:
Sentron AG, a Melexis Conpany
For Technical and Commercial Support:
For North America: www.gmw.com, [email protected]
For the rest of the world: www.melexis.com, [email protected]
Application notes are available on the website.
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 life-support or life-sustaining 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.
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for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • [email protected]
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