Datasheet 91205CSA-1V old 365 DownloadLink 5313

CSA-1V
August 2004
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. 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.
SOIC-8
Package:
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
PD, programming data 1)
PC, programming clock 1)
CO_OUT, common output
Note 1: Used for factory programming
Page 1 of 5
Sentron AG • Baarerstrasse 73 • 6300 Zug • Switzerland • Tel: +41 41 711 2170 • Fax: +41 41 711 2188
www.sentron.ch • [email protected] •
for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • [email protected]
CSA-1V
August 2004
Absolute Maximum Ratings
Symbol
VSUP
T
Parameter
Supply Voltage
Ambient Temperature
Min.
0
-40
Typ.
Max.
6
+150
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 150°C, VSUP=4.5V to 5.5V if not otherwise specified.
Symbol
ISUP
VCommon
BW
tR
Parameter
Supply Current
Common (reference)
Output Voltage2)
Bandwidth: DC to
Response Time
Min.
VSUP/2
-20mV
Typ.
11
VSUP/2
Max.
16
VSUP/2
+20mV
Unit
mA
Test Conditions
IOUT=0mA
100
kHz
µs
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
∆S/S∆T
Voff
Parameter
Magnetic Sensitivity 3)
Magn. Sensitivity
Temperature Drift
Offset Voltage
∆Voff/∆T
Offset Temperature Drift
BFS
BL
Full Scale Magnetic Field
Range 5)
Linear Magnetic Field Range
NL
Non Linearity
∆Bnoise
Input referred magnetic noise
spectrum density (RMS)
Min.
270
Typ.
300
-0.02
Max.
330
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/√Hz
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_OUT-CO_OUT)
Note 5: Device saturates for B>BFS, but is not damaged
Page 2 of 5
Sentron AG • Baarerstrasse 73 • 6300 Zug • Switzerland • Tel: +41 41 711 2170 • Fax: +41 41 711 2188
www.sentron.ch • [email protected] •
for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • [email protected]
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
100nF
CO_OUT 8
2 Vdd
PC 7
3 n.c.
PD 6
4 PV
GND 5
GND
*
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 • Baarerstrasse 73 • 6300 Zug • Switzerland • Tel: +41 41 711 2170 • Fax: +41 41 711 2188
www.sentron.ch • [email protected] •
for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • [email protected]
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
1900
B
A_OUT
PV
GND
PD
Fig. 4
PC
CO_OUT
Dimensions of dice
Page 4 of 5
Sentron AG • Baarerstrasse 73 • 6300 Zug • Switzerland • Tel: +41 41 711 2170 • Fax: +41 41 711 2188
www.sentron.ch • [email protected] •
for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • [email protected]
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.
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
Linearity
Error [%]
<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]
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 5
Sentron AG • Baarerstrasse 73 • 6300 Zug • Switzerland • Tel: +41 41 711 2170 • Fax: +41 41 711 2188
www.sentron.ch • [email protected] •
for North America: GMW Associates • Tel: +1 (650) 802-8292 • Fax: +1 (650) 802-8298 • [email protected]
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