Continental Automotive GmbH 5NA920791A Manual De Usuario
Keller, I ID S3 AD AE CO
Page 5
20.10.2016
3
Power supply
Because ANT drivers drive antenna with VDD and VSS power supply levels all variations and
noise in power supply are directly fed to antenna resonant circuit. Any supply voltage fluctuations
or ripple are transferred into antenna current fluctuations by the antenna driver transistors. This is
equal to a current modulation that results in a voltage modulation at the antenna tap point. There
is no possibility for the demodulator to distinguish this modulation from the transponder
modulation (transponder signal superimposed on antenna voltage is in the range of tens of mV).
Especially in the passband of the demodulator filters (<10 kHz), the system is very sensitive
against supply hum and ripple.
For this reason a separate linear voltage regulator is used for the immobilizer circuit. The Enable
pin of this regulator is controlled by the microcontroller. The regulator is only enabled during
transponder communication.
KL30 Voltage for guaranteed immobilizer function and performance:
noise in power supply are directly fed to antenna resonant circuit. Any supply voltage fluctuations
or ripple are transferred into antenna current fluctuations by the antenna driver transistors. This is
equal to a current modulation that results in a voltage modulation at the antenna tap point. There
is no possibility for the demodulator to distinguish this modulation from the transponder
modulation (transponder signal superimposed on antenna voltage is in the range of tens of mV).
Especially in the passband of the demodulator filters (<10 kHz), the system is very sensitive
against supply hum and ripple.
For this reason a separate linear voltage regulator is used for the immobilizer circuit. The Enable
pin of this regulator is controlled by the microcontroller. The regulator is only enabled during
transponder communication.
KL30 Voltage for guaranteed immobilizer function and performance:
Minimum Operating Voltage = 6.5V
Nominal Operating Voltage = 13.5V
Maximum Operating Voltage = 17.0V
Nominal Operating Voltage = 13.5V
Maximum Operating Voltage = 17.0V
4
Technical data
Parameter
Symbol
Min
Typ
Max
Unit
Conditions
Supply
Supply Voltage Immobilizer
Module
Module
V
KL30
6.5
13.5
17.0
V
Supply Voltage LRES B2
V
DD
4.5
5.0
5.5
V
Current consumption
INHIBIT OFF
INHIBIT OFF
I
Q
10
µ
A
V
INH
= 0 V;
Full temp. range
Supply current in Sleep
Mode (Quiescent current)
Mode (Quiescent current)
I
DDsleep
40
µ
A
Full temp. range
Supply current excluding
drivers current in Normal
Mode
drivers current in Normal
Mode
I
DDon
5
10
mA
Power on reset level
V
por
1.4
3.6
V
Full temp. range
AGND level
V
AGND
2.35
2.5
2.65
V
Full temp. range
µµµµ
C interface
Input logic high
V
IH
0.8 V
DD
V
Full temp. range
Input logic low
V
IL
0.2 V
DD
V
Full temp. range
Input leakage current
I
L
-1
+1
µ
A
Full temp. range
L/Z_OUT sink current
I
L/Z_OUT
2.5
mA
L/Z_OUT output logic low
V
L/Z_OUT
0.4
V
Environment requirements
Ambient temperature
T
A
-40
+85
°C
Junction temperature
T
J
-40
+110
°C
Package thermal resistor
R
th
69
70
71
°C/W
Antenna circuit