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AUTOMOTIVE CURRENT TRANSDUCER
CAB 300-C/SP2
The CAB family is for battery monitoring applications
where high accuracy and very low offset are required.
Features
Transducer using Fluxgate technology
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Principle of Fluxgate transducers
Introduction
A low-frequency fluxgate transducer is made of a wound core
which saturates under low induction.
A current chopper switches the winding’s current to saturate the
magnetic core alternatively at ± B max with a fixed frequency.
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Fluxgate transducers use the change of the saturation’s
point symmetry to measure the primary current.
●● Zero offset
●● Unlimited over-current capability
Due to the principle of switching the current, all offsets (electric
and magnetic) are cancelled.
●● Panel mounting
●● Unipolar + 12 V battery power supply
●● TA = - 40°C .. + 105°C
●● Accuracy (over temperature)
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- εG= Sensitivity error < 0.5 %
- εL= Linarity error < 0.1 %
●● Output signal:
Current
chopper
- CAN.C (500 kbps)
Signal
aquisition
and
processing
digital
Output
C
●● Optional internal digital low-pass frequency filter.
Advantages
●● No offset error
●● High accuracy
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●● Low linearity error
●● Full galvanic isolation.
Automotive applications
●● Hybrid and electric vehicle battery pack
●● Conventional lead-acid batteries
P
●● Accurate current measurement for battery management
S
applications (SOC, SOH, SOF etc.).
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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
www.lem.com
CAB 300-C/SP2
E
C
I
M
E
N
Dimensions CAB 300-C/SP2 family (in mm)
Pin Out
CAN-L
B
CAN-H
C
GND
D
VC
S
P
A
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CAB 300-C/SP2
Absolute maximum ratings (not operating)
Unit
Over-voltage
VC max
V
24
Reverse polarity
VC min
V
-50
Minimum supply voltage
VC min
V
6
continuous
Maximum supply voltage
VC max
V
18
continuous
VESD max
kV
4
Pins
RIS min
MΩ
Vd
kV
Electrostatic discharge voltage
Isolation resistance
Rms voltage for AC isolation test
Specification
V
32
N
Symbol
VC max
Conditions
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Parameter
Load dump over-voltage
400 ms
1 minute
500
500 V ISO 16750-2
2.5
50Hz, 1 min
Operating characteristics
Parameter
Symbol
Specification
Unit
Min
Typical
Conditions
Max
M
Electrical Data
Primary current, measuring range
IPM
A
-350
Supply voltage
VC
V
8
Current consumption @ IP = 0 A
IC
mA
Current consumption @ IP = 250 A
IC
mA
Overall accuracy @ IP = 0 A
XG
mA
-10
0
10
In temperature range
Overall accuracy @ IP = 300 A
XG
mA
-1500
500
1500
In temperature range
Linearity error
εL
%
0.1
In temperature range
2
without digital filtering
350
13.5
16
80
IC is a function of IP
Signal delay
-0.1
ms
1
TA
°C
-40
BW
Hz
TBD
C
Frequency bandwidth
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Performance Data
Ambient operating temperature
Can Output
CAN Interface characteristics:
full accuracy
30
1.5
+105
250
500
@ -3 dB attenuation
Optional internal filter can be implemented
●● CAN High Speed, SAE CAN Class C
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●● High speed CAN transceiver: TJA1040
●● CAN protocol: Version 2.0A/B
●● Byte order: big endian (Motorola)
Parameter
CAN speed
Unit
Value
Comments
kbps
500
possible configuration: 125 to 1000
%
0.27
Message Description
P
CAN oscillator tolerance
ID
Name
S
Return Current IP (mA): 0x3C2
CAB300_IP
Filtered value
Data Lenght
(Nb bytes)
8
Type of
frame
Standard
Message launch
Signal Description
type
Cyclic message
10ms cycle
Signal Name
Start Bit End Bit
IP Value:
80000000H=0mA,
7FFFFFFFH=-1mA,
80000001H=1mA
IP_VALUE
0
31
b0: Error Information
(0=Normal, 1: failure
ERROR_INDICATION
32
32
b7 to b1: RxQuality
(0 to 100%)
ERROR_INFORMATION
33
39
Vacant bits (fixed to 0) VACANT_DATA_3BYTES
40
63
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www.lem.com
Diagnostic Trouble Code (DTC)
ERROR INDICATION
ERROR INFORMATION
Error on dataflash CRC
FFFF FFFF
1
0x41
Fluxgate running at high frequency (<2.5 kHz) for more than 10 ms
FFFF FFFF
1
0x42
Fluxgate not oscillating for more than 20ms
FFFF FFFF
1
0x43
CAB entenred in fail safe mode
FFFF FFFF
1
0x44
Signal not available for more than 100ms
FFFF FFFF
1
0x46
Bridge voltage protection
FFFF FFFF
1
0x47
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IP VALUE
M
Failure mode
N
CAB 300-C/SP2
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Maximum global error over temperature range
2000
C
1500
500
0
-400
-300
-200
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Accuracy curve
Error (mA)
1000
-100
-500
0
100
200
300
400
-1000
-1500
-2000
S
P
I (A)
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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
www.lem.com
CAB 300-C/SP2
PERFORMANCES PARAMETERS DEFINITIONS
value
Non linearity example
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IP
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Linearity:
The maximum positive or negative discrepancy with a reference
straight line IP value = f (IP).
Unit: linearity (%) expressed with full scale of IP max.
Reference
straight line
Max linearity error
IP
M
Linearity variation in IN %
S
P
E
C
I
Accuracy:
Accuracy is the maximum error between measured value and
a reference value.
Page 5/5
100916AFTS/0
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
www.lem.com