L9637D STMicroelectronics, L9637D Datasheet - Page 9

• Manufacturer Part Number: L9637D
• Description: IC INTERFACE ISO 9141 SOIC-8
• Manufacturer: STMicroelectronics
• Type: Bus Driverr

Specifications of L9637D

• Input Type: Logic
• Output Type: Logic
• Interface: ISO9141
• Current - Supply: 2.3mA
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Maximum Operating Temperature: + 150 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L9637
3
Functional description
The L9637 is a monolithic bus driver designed to provide bidirectional serial communication
in automotive diagnostic applications according to the specification "Diagnostic Systems
ISO9141".
The device provides a bidirectional link, called K, to the V
includes a separate comparator L which is also able to be linked to the V
TX and output RX of K are related to V
comparator output LO has a pull up resistance connected to V
The maximum external pull up resistance at K related to V
5 kΩ to achieve clear output ON conditions.
All V
sufficient hysteresis to suppress line spikes. These pins are protected against overvoltages,
shorts to GND and V
These features are also given for TX, RX and LI only taking into account the behavior 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 temperature must decrease below the K switch ON temp. To achieve no fault for
V
The device is also protected against reverse battery condition. During lack of V
pins shows high impedance characteristic. To realize a lack of the V
K the outputs LO and RX shows defined ON status.
Suppressing all 4 classes of "Schaffner" signals all pins can be load with short energy
pulses of max. ±0.2 mJ. All these features together with a high possible baud rate
>50Kbaud, controlled output slopes for low EMI, a wide power supply voltage range and a
very small quiescent current during OFF (TX LI K=High) condition IS
real standby function with zero power consumption IS
powering V
After wake up of the system from OFF or SB condition the first output signal will have an
additional delay time td
The typical output voltage behavior for the K, LO, RX outputs as a function of the output
current is shown in
level changes from R
low output current or after a negative transient forced to the output or to the supply voltage
line.
S
undervoltage conditions the outputs will be switched OFF and stay at high impedance.
Bat
bus defined inputs LI and K have supply voltage dependent thresholds together with
CC
≤ 0.5 V make this device high efficient for automotive bus system.
Figure
ON
S
and can also be driven beyond V
typ
* I
≤ 5 µs see also
OUT
6.
Figure 7
to I
Doc ID 1765 Rev 7
OUT
shows a waveform of the output signal when the low
* 2 * R
CC
with her integrated pull up resistances. Also the L
Figure
ON
+ U
5.
BE
SB typ
state. This variation occurs due to too
S
Ba
S
and GND.
should not be higher than R
t related diagnosis bus. It also
≤ 1 µA during system de
CC
.
S
Functional description
off typ
related bus line LI and
Ba
≤ 120 µA, and a
t bus. The input
S
or GND all
KO
9/15
≤