CSA-1V [ETC]
Current Sensor; 电流传感器
ETC 
CSA-1V
August 2004
CSA-1V
Current Sensor
Features:
Applications:
•
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
•
•
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:
SOIC-8
1 A_OUT, analog sensor output
2 VDD pos. supply voltage
3 Not connected
B
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 5
Sentron AG
www.sentron.ch
for North America: GMW Associates
•
Baarerstrasse 73
•
6300 Zug
•
Switzerland
• Tel: +41 41 711 2170 • Fax: +41 41 711 2188
•
sales@sentron.ch
•
•
Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • sales@gmw.com
CSA-1V
August 2004
Absolute Maximum Ratings
Symbol
Parameter
Min.
0
Typ.
Max.
6
Unit
V
oC
Remarks
VSUP
Supply Voltage
T
Ambient Temperature
-40
+150
Recommended Operating Conditions
Symbol
VSUP
Parameter
Min.
Typ.
5
Max.
Unit
Remarks
Supply Voltage
Output Current
Load Capacitance
4.5
-1
5.5
1
1000
V
IOUT
CL
mA
pF
Electrical Characteristics
At T=-40°C to 150°C, VSUP=4.5V to 5.5V if not otherwise specified.
Symbol
ISUP
Parameter
Supply Current
Min.
Typ.
11
VSUP/2 VSUP/2 VSUP/2
Max.
16
Unit
mA
Test Conditions
IOUT=0mA
VCommon
Common (reference)
Output Voltage2)
-20mV
+20mV
BW
tR
Bandwidth: DC to
100
kHz
µs
Response Time
6
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
Parameter
Min.
270
Typ. Max.
Unit
V/T
Test Conditions
B = BL
Magnetic Sensitivity 3)
300
330
Magn. Sensitivity
Temperature Drift
Offset Voltage
IOUT=0mA
∆S/S∆T
-0.02
-15
0.02
%/°C
mV
T=-20°C to 125°C
B=0T, Iout=0mA,
T=20°C
B=0T, IOUT=0mA,
T=-20°C to 125°C
Voff
0
0
15
0.2
7.5
Offset Temperature Drift
∆Voff/∆T
BFS
-0.2
mV/°C
Full Scale Magnetic Field
Range 5)
Linear Magnetic Field Range
-7.5
-5
mT
mT
BL
5
0.2
1
0.1
0.5
B = BL
B = BFS
NL
Non Linearity
%
Input referred magnetic noise
spectrum density (RMS)
∆Bnoise
nT/√Hz
125
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
Page 2 of 5
Sentron AG
www.sentron.ch
for North America: GMW Associates
•
Baarerstrasse 73
•
6300 Zug
•
Switzerland
• Tel: +41 41 711 2170 • Fax: +41 41 711 2188
•
sales@sentron.ch
•
•
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
CO_OUT 8
PC 7
PD 6
3 n.c.
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
Page 3 of 5
Sentron AG
www.sentron.ch
for North America: GMW Associates
•
Baarerstrasse 73
•
6300 Zug
•
Switzerland
• Tel: +41 41 711 2170 • Fax: +41 41 711 2188
•
sales@sentron.ch
•
•
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 µm)
1900
VDD
B
A_OUT
PV
GND
PD PC
CO_OUT
Fig. 4 Dimensions of dice
Page 4 of 5
Sentron AG
www.sentron.ch
for North America: GMW Associates
•
Baarerstrasse 73
•
6300 Zug
•
Switzerland
•
Tel: +41 41 711 2170
•
Fax: +41 41 711 2188
•
sales@sentron.ch
•
•
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/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.
Approx.
Linearity
Resolution Resolution Error [%]
(raw) [A]
(tINT=1ms)
[A]
10
50
100
500
1000
0.2
2
4
20
40
120
25
12
3
0.1
0.5
1
3.5
7
0.01
0.05
0.1
0.35
0.7
<0.1
1.5
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
2 / 10
No of tracks
under sensor
Sensitivity
[mV/A]
140
Resolution
(raw) [mA]
70
Resolution
tINT=1ms [mA] Error [%]
Linearity
4
1
7
<0.1
28
10 / 50
35
280
(*) max current depends on PCB properties/thermal budget
Please contact us for documentation such as application notes, technical papers and others.
Page 5 of 5
Sentron AG
www.sentron.ch
for North America: GMW Associates
•
Baarerstrasse 73
•
6300 Zug
•
Switzerland
• Tel: +41 41 711 2170 • Fax: +41 41 711 2188
•
sales@sentron.ch
•
•
Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • sales@gmw.com
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