Electric Environment - Wavecom G2 User Manual

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5.2.2. Electric environment

The following figure sum up electrical constraints in an automotive
environment:
Length of transient
Steady state
3 - 5 minutes
200ms to 400ms
< 0.32 s
< 0.20 s
90ms
1ms
15µs
Note : These transients may be present on any wire in the vehicle.
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Cause
Failed Voltage Regulator
Jump start with 24 V
battery
Load dump - i.e.,
disconnection of battery
while at high charging
rates
Inductive Load Switching
Transient
Alternator Field Decay
Ignition Pulse, Battery
Disconnected
Mutual Coupling in
Harness (Note)
Ignition Pulse, Normal
Accessory Noise
Transceiver Feedback
Energy
capability
Voltage
Amplitude
oo
+ 18 V
oo
+/- 24 V
≥
10 J
≤
125V
<1 J
-300V to +80V
<1 J
-100V to -40V
<0.5 J
≤
75V
<1 J
<200V
<0.001 J
<3V
<1.5V
20mV
7
Possible
frequency of
application
Infrequent
Infrequent
Infrequent
Often
Each Turn-Off
<500Hz Several
Times in vehicle
Life
Often
<500Hz
Continuous
50 Hz to 10 KHz
R.F.