L9637D - STMicroelectronics

L9637
Monolithic bus driver with ISO 9141 interface
Features
■
Operating power supply voltage range
4.5 V  VS  36 V (40 V for transients)
■
Reverse supply (battery) protected down to
VS  -24 V
■
Standby mode with very low current
consumption ISSB 1 mA @ VCC 0.5 V
■
Low quiescent current in off condition
ISOFF = 120 µA
■
TTL compatible TX input
■
■
Bidirectional K-I/O pin with supply voltage
dependent input threshold
High input impedance for open VS or GND
connection
■
■
Overtemperature shut down function Selective
to K-I/O pin
Defined output ON status of LO or RX for open
LI or K inputs
■
Defined K output OFF for TX input open
■
Wide input and output voltage range
-24 V  VK  VS
■
Integrated pull up resistors for TX, RX and LO
■
EMI robustness optimized
■
K output current limitation, typ. IK = 60 mA
■
Defined OFF output status in undervoltage
condition and VS or GND interruption
■
Controlled output slope for low EMI
Table 1.
SO8
Description
The L9637 is a monolithic integrated circuit
containing standard ISO 9141 compatible
interface functions.
Device summary
Order code
Package
Packing
L9637D
SO8
Tube
L9637D013TR
SO8
Tape and reel
SO8
Tube
SO8
Tape and reel
E-L9637D(1)
E-L9637D013TR
(1)
1. Device in ECOPACK® package (see Section 4: Package information on page 13).
September 2013
Doc ID 1765 Rev 8
1/15
www.st.com
15
Contents
L9637
Contents
1
2
Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2/15
Doc ID 1765 Rev 8
L9637
Block diagram and pin description
1
Block diagram and pin description
1.1
Block diagram
Figure 1.
Block diagram
VCC
VS
RTX
K
IK
RL O
+
OFF
RRX
TX
1,75V
RX
+
LI
LO
+
IL I
GND
1.2
Pin description
Figure 2.
Table 2.
Pin connection (top view)
RX
1
8
LI
LO
2
7
VS
VCC
3
6
K
TX
4
5
GND
Pin description
N.
Name
Function
1
RX
Output for K as input
2
LO
Output L comparator
3
VCC
4
TX
5
GND
Common GND
6
K
Bidirectional I/O
7
VS
Supply voltage
8
LI
Input L comparator
Stabilized voltage supply
Input for K as output
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Electrical specification
L9637
2
Electrical specification
2.1
Absolute maximum ratings
Table 3.
Absolute maximum ratings (No damage or latch)
Symbol
VS
VCC
VS/dt
VLI, K
Parameter
Value
Unit
Supply voltage ISO transients
t = 400 ms
-24 to +36
-24 to +40
V
Stabilized voltage
-0.3 to +7
V
Supply voltage transient
-10 to +10
V/µs
-24 to VS
V
-24 to VCC
V
Pin voltage
VLO, RX, TX
Note:
Max. ESD voltages are ±2kV with human body model C = 100pF, R = 1.5k corresponds to
maximum energy dissipation 0.2mJ according to MIL883C.
2.2
Thermal data
Table 4.
Thermal data
Symbol
Parameter
Min.
Typ.
Max.
Unit
TJSDon
Temperature K shutdown switch on threshold
160
-
200
°C
TJSDoff
Temperature K shutdown switch off threshold
150
-
200
°C
Thermal steady state junction to ambient resistance
130
155
180
°C/W
Rth j-amb
2.3
Electrical characteristics
The electrical characteristics are valid within the below defined operating conditions, unless
otherwise specified. The function is guaranteed by design until TJSDon temperature
shutdown switch-on-threshold.
Table 5.
Symbol
VS
VCC
Tj
ICC
4/15
Electrical characteristics
Parameter
Supply voltage
Test condition
Min.
Typ.
Max.
Unit
4.5
-
36
V
3
5
7
V
-40
-
150
°C
VCC  5.5 V; VLI,VTX = 0 V
-
1.4
2.3
mA
VK  VKhigh; VLI  VLIhigh
VTX = VCC @ VCC  5.5 V
-5
<1
5
µA
-
Stabilized voltage
see note
Junction temperature
-
Supply VCC current
(1)
Doc ID 1765 Rev 8
L9637
Table 5.
Symbol
Electrical specification
Electrical characteristics (continued)
Parameter
ISON
ISOFF
Supply VS current
ISSB
VKlow
VKhigh
Input voltage low state
Input voltage high state
Test condition
Min.
Typ.
Max.
Unit
VS  16 V; VLI, VTX = 0 V
-
1.2
3
mA
VK  VKhigh; VLI  VLIhigh
VTX  VTXhigh @ VS  12 V
-
120
220
µA
VCC  0.5 V @ VS  12 V
-
<1
-
µA
RX output status LOW
4.5 V  VS  18 V
-24
-
0.45VS
V
RX output status LOW
18 V < VS
-24
-
8
V
RX output status HIGH
4.5 V  VS  18 V
0.55VS
-
VS
V
RX output status HIGH
18 V < VS
12
-
VS
V
Input threshold hysteresis
VKhigh - VKlow
-
0.025
VS
0.8
V
Input current
@ VTX  VTXhigh
VK  VS; VS, VCC  0 or
VS, VCC = open
-5
4
25
µA
RKON
Output ON impedance
@ VS  6.5 V
VTX  VTXlow
IK  7 mA (2)
-
10
30

IKSC
Short circuit current
30
60
100
mA
VTXlow
Input voltage LOW state
-24
-
1
V
VTXhigh
Input voltage HIGH state
2.5
-
VCC
V
RRXON
RLOON
Output ON impedance
40
90
IRXSC
ILOSC
Output short circuit current
9
20
35
mA
VRXH
VLOH
Output voltage HIGH state
10M  RLRX
10M  RLLO
VCC0.25
VCC0.1
VCC-
V
RLO
RRX
Output pull-up resistance
Output status = (HIGH)
-0.15 V  VLO  VCC + 0.15 V
-0.15 V  VRX  VCC + 0.15 V
5
10
20
k
RTX
Input pull up resistance
-0.15 V  VTX  VCC + 0.15 V
10
20
40
k
VLIlow
Input voltage LOW state
LO output status LOW
4.5 V  VS  18 V
LO output status LOW 18 V < VS
-24
-24
-
0.45VS
8
V
VKhys
IKoff
VK  VKlow; VLI  VLIlow
VS  6.5 V IRX, LO  1 mA
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
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Electrical specification
Table 5.
L9637
Electrical characteristics (continued)
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
-
VS
V
VLhigh
Input voltage HIGH state
LO output status HIGH
0.55VS
4.5 V  VS  18 V
12
LO output status HIGH 18 V < VS
VLIhys
Input threshold hysteresis
VLIhigh - VLIlow
-
0.025VS
0.8
V
Input current
VLI  VS VS, VCC  0 or
VS, VCC = open
-5
4
25
µA
-
-
20
pF
-
-
50
kHz
-
2
6
µs
-
2
6
µs
-
4
17
µs
-
4
17
µs
ILI
CKi,LO,RX
Internal output capacities
fLI-LO
fK-RX
fTX-k
Transmission frequency
trLI-LO
trK-RX
trTX-K
Rise time
tfLI-LO
tfK-RX
tfTX-K
Fall time
tOFF,LI-LO
tOFF,K-RX
tOFF,TX-K
Switch OFF time
tON,LI-LO
tON,K-RX
tON,TX-K
Switch ON time
9 V < VS < 16 V (external loads)
RKO = 510 , CK  1.3 nF
in active mode see Figure 5
for the definition of tr, tf see
Figure 3
9 V < VS < 16 V (external loads)
RKO = 510 , CK  1.3 nF
for the definition of ton, tOFF see
Figure 3.
9 V < VS < 16 V (external loads)
RKO = 510 , CK  1.3 nF
(inactive mode see Figure 5)
1. Specs are tested at 5V only. Compliance on Vcc full range is guaranteed by design.
2. For output currents lower than this value a series protection diode can become active. See also Figure 8 and 9.
6/15
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L9637
Electrical specification
Figure 3.
Input to output timings and output pulse shape
VI
t
VOUT
80%
80%
20%
20%
tr
t OFF
Doc ID 1765 Rev 8
tf
t
t ON
7/15
Electrical specification
Figure 4.
L9637
ISO application circuit
VCC
VS
RTX
RLO
RRX
40V
VS
5V
R KO
TX
-
510 Ohm
0.4 Ohm
C K K
K
VCC
I/O
+
IK OFF
1,75V
RX
Diagnostic
-
Tester
I/O
uP
+
LI
LO
I/O
-
L
ILI
+
GND
L Line
K Line
ECU1
K
CK
LI
ECU2
8/15
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VDD
L9637
3
Functional description
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 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 related to VS should not be higher than RKO 
5 kto achieve clear output ON conditions.
All VBat bus defined inputs LI and K have supply voltage dependent thresholds together with
sufficient 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 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
VS undervoltage 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 impedance characteristic. To realize a lack of the VS related bus line LI and
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 ISoff typ  120 µA, and a
real standby function with zero power consumption ISSB typ  1 µA during system de
powering VCC  0.5 V make this device high efficient for automotive bus system.
After wake up of the system from OFF or SB condition the first output signal will have an
additional delay time tdtyp  5 µs see also Figure 5.
The typical output voltage behavior for the K, LO, RX outputs as a function of the output
current is shown in Figure 6. Figure 7 shows a waveform of the output signal when the low
level changes from RON * IOUT to IOUT * 2 * RON + UBE state. This variation occurs due to too
low output current or after a negative transient forced to the output or to the supply voltage
line.
Doc ID 1765 Rev 8
9/15
Functional description
Figure 5.
L9637
Typical timing for mode transitions
O FF
a c ti v e
O FF
a c tiv e
LI
LO
TX
K
RX
td
10/15
t ON
td
LI - LO
Doc ID 1765 Rev 8
t ON
TX - K
L9637
Functional description
Figure 6.
Output characteristics at K, LO, RX
IO UT
M IN
V OUT
= IO U T * R D S O N
V OUT
= IO U T * 2 * R D S O N + U B E
R
DS ON
IOU T
p r o t e c tio n d i o d e
0 .8 V
Figure 7.
VO UT
Output signal shape related to output current
V IN
t
VOUT
IO U T * 2 * R D S O N + U B E
IO U T * R D S O N
IO U T > IO U T
M IN
IO U T > IO U T
t
M IN
I O U T < IO U T
M IN
Doc ID 1765 Rev 8
11/15
Functional description
Figure 8.
L9637
EMS performance (ISO 9141 bus system)
V S = 1 2V
=
510 Ohm
VS
50 Ohm
TX
K
P ro b e
IS O i n te rfa c e
4 0 dB
R h o d e & S c h w a rtz
P im a x = 5 W
0 .1 - 1 0 0 0 M H z
136 Ohm
NAP - 73
S MG
1 0k H z
1 .5 n F
68 Ohm
VS
Pi
D
RX
K
IS O i n te rfa c e
NAP
Signal comparison
10%
D£ 10%
Δ≤±
Figure 9.
Input power vs. frequency diagram
P i (m W )
n o t i n c id e n t p o w e r re s i s ta n t
10000
5000
in c id e n t p o w e r r e s is t a n t
1000
100
1
12/15
10
Doc ID 1765 Rev 8
100
1000
f (M H z)
L9637
4
Package information
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Figure 10. SO8 mechanical data and package dimensions
mm
inch
DIM.
MIN.
TYP.
A
MAX.
MIN.
TYP.
1.750
MAX.
0.0689
A1
0.100
0.250 0.0039
A2
1.250
0.0492
b
0.280
0.480 0.0110
0.0189
0.230 0.0067
0.0091
0.0098
c
0.170
D (1)
4.800
4.900
5.000 0.1890 0.1929 0.1969
E
5.800
6.000
6.200 0.2283 0.2362 0.2441
3.800
3.900
4.000 0.1496 0.1535 0.1575
(2)
E1
e
1.270
0.0500
h
0.250
0.500 0.0098
L
0.400
1.270 0.0157
L1
k
ccc
1.040
0˚
OUTLINE AND
MECHANICAL DATA
0.0197
0.0500
0.0409
8˚
0.100
0˚
8˚
0.0039
Notes: 1. Dimensions D does not include mold flash,
protrusions or gate burrs.
Mold flash, potrusions or gate burrs shall not
exceed 0.15mm in total (both side).
2. Dimension “E1” does not include interlead flash
or protrusions. Interlead flash or protrusions shall
not exceed 0.25mm per side.
SO-8
0016023 D
Doc ID 1765 Rev 8
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Revision history
5
L9637
Revision history
Table 6.
14/15
Document revision history
Date
Revision
Changes
24-Jan-2002
5
Initial release.
07-Nov-2008
6
Document reformatted.
Added Table 1: Device summary on page 1.
Updated Section 4: Package information on page 13.
15-Jun-2009
7
Updated the values of “stabilized voltage” and “transmission
frequency” parameters on Table 5: Electrical characteristics.
20-Sep-2013
8
Updated disclaimer.
Doc ID 1765 Rev 8
L9637
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