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What is L9637D?

This electronic component, produced by the manufacturer "STMicroelectronics", performs the same function as "ISO 9141 INTERFACE".


L9637D Datasheet PDF - STMicroelectronics

Part Number L9637D
Description ISO 9141 INTERFACE
Manufacturers STMicroelectronics 
Logo STMicroelectronics Logo 


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® L9637
ISO 9141 INTERFACE
OPERATING POWER SUPPLY VOLTAGE
RANGE 4.5V VS 36V (40V FOR TRAN-
SIENTS)
REVERSE SUPPLY (BATTERY) PRO-
TECTED DOWN TO VS -24V
STANDBY MODE WITH VERY LOW CUR-
RENT CONSUMPTION ISSB 1µA @ VCC 0.5V
LOW QUIESCENT CURRENT IN OFF CON-
DITION ISOFF = 120µA
TTL COMPATIBLE TX INPUT
BIDIRECTIONAL K-I/O PIN WITH SUPPLY
VOLTAGE DEPENDENT INPUT THRESHOLD
OVERTEMPERATURE SHUT DOWN FUNC-
TION SELECTIVE TO K-I/O PIN
WIDE INPUT AND OUTPUT VOLTAGE
RANGE -24V VK VS
K OUTPUT CURRENT LIMITATION, TYP IK =
60mA
DEFINED OFF OUTPUT STATUS IN UNDER-
VOLTAGE CONDITION AND VS OR GND IN-
TERRUPTION
CONTROLLED OUTPUT SLOPE FOR LOW
EMI
HIGH INPUT IMPEDANCE FOR OPEN VS OR
GND CONNECTION
SO8
Minidip
ORDERING NUMBERS:
L9637D
L9637
DEFINED OUTPUT ON STATUS OF LO OR
RX FOR OPEN LI OR K INPUTS
DEFINED K OUTPUT OFF FOR TX INPUT
OPEN
INTEGRATED PULL UP RESISTORS FOR
TX, RX AND LO
EMI ROBUSTNESS OPTIMIZED
DESCRIPTION
The L9637 is a monolithic integrated circuit con-
taining standard ISO 9141 compatible interface
functions.
BLOCK DIAGRAM
VCC
VS R T X R L O R R X
K
IK O F F
-
+
1, 75 V
TX
- RX
+
LI -
+IL I
LO
GND
December 1998
1/11

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L9637D equivalent
Figure 2: ISO Application Circuit
L9637
VS
510 Ohm
VS
40V
R KO
K CK K
0.4 Ohm
Diagnostic
Tester
L
LI
RTX RLO RRX
VCC
5V
IK OFF
-
+
1 ,75V
-
+
-
+
ILI
TX VCC
I/O
RX
I/O
uP
LO
I/O
GND
VDD
ECU1
K
CK
LI
ECU2
FUNCTIONAL DESCRIPTION
The L9637 is a monolithic bus driver designed to
provide bidirectional serial communication in auto-
motive diagnostic applications according to the
specification ”Diagnostic Systems ISO9141”.
The device provides a bidirectional link, called K,
to the VBat related diagnosis bus. It also includes
a separate comparator L which is also able to be
linked to the VBat bus. The input TX and output
RX of K are related to VCC with her integrated pull
up resistances. Also the L comparator output LO
has a pull up resistance connected to VCC.
The maximum external pull up resistance at K re-
lated to VS should not be higher than RKO 5K
to achieve clear output ON conditions.
All VBat bus defined inputs LI and K have supply
voltage dependent thresholds together with suf-
ficent hysteresis to suppress line spikes. These
pins are protected against overvoltages, shorts to
GND and VS and can also be driven beyond VS
and GND. These features are also given for TX,
RX and LI only taking into account the behaviour
of the internal pull up resistances. The thermal
shut down function switches OFF the K output if
the chip temperature increases above the thermal
shut down threshold. To reactivate K again the
chip temperature must decrease below the K
switch ON temp. To achieve no fault for VS under-
voltage conditions the outputs will be switched
OFF and stay at high impedance. The device is
also protected against reverse battery condition.
During lack of VS or GND all pins shows high im-
pedance characteristic. To realize a lack of the VS
related bus line LI and K the outputs LO and RX
shows defined ON status.
5/11


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L9637D datasheet


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