How it Works
ST
Loading...
L9637
User Manual
15 pgs180.03 Kb0
Table of contents
Loading...

ST L9637 User Manual

Download
Monolithic bus driver with ISO 9141 interface
Features
■ Operating power supply voltage range
4.5 V ≤ V
■ Reverse supply (battery) protected down to
V
≥ -24 V
S
■ Standby mode with very low current
consumption IS
■ Low quiescent current in off condition
IS
OFF
■ TTL compatible TX input
■ Bidirectional K-I/O pin with supply voltage
dependent input threshold
■ Overtemperature shut down function Selective
to K-I/O pin
■ Wide input and output voltage range
-24 V ≤ V
■
K output current limitation, typ. IK = 60 mA
■ Defined OFF output status in undervoltage
condition and V
■ Controlled output slope for low EMI

Table 1. Device summary

S
≤ 1 mA @ VCC ≤ 0.5 V
SB
= 120 µA
≤ V
K
S
or GND interruption
S
L9637
SO8
■ High input impedance for open V
connection
■ 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 containing standard ISO 9141 compatible interface functions.
or GND
S
Order code Package Packing
L9637D SO8 Tube
L9637D013TR SO8 Tape and reel
E-L9637D
E-L9637D013TR
1. Device in ECOPACK® package (see Section 4: Package information on page 13).
June 2009 Doc ID 1765 Rev 7 1/15
(1)
(1)
SO8 Tube
SO8 Tape and reel
www.st.com
15
Contents L9637
Contents
1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 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 7
L9637 Block diagram and pin description

1 Block diagram and pin description

1.1 Block diagram

Figure 1. Block diagram

VS
K
LI

1.2 Pin description

Figure 2. Pin connection (top view)

RTX RLO RRX
-
IK
OFF
+
­+
-
ILI
RX
LO
VCC
TX GND
+
8
2
3
4
7
6
5
VCC
TX
1,75V
RX
LO
GND
LI1
VS
K

Table 2. Pin description

N. Name Function
1 RX Output for K as input
2 LO Output L comparator
3 VCC Stabilized voltage supply
4 TX Input for K as output
5 GND Common GND
6 K Bidirectional I/O
7 VS Supply voltage
8 LI Input L comparator
Doc ID 1765 Rev 7 3/15
Electrical specification L9637

2 Electrical specification

2.1 Absolute maximum ratings

Table 3. Absolute maximum ratings (No damage or latch)

Symbol Parameter Value Unit
V
S
V
CC
ΔV
S/dt
V
LI, K
V
LO, RX, TX
Supply voltage ISO transients t = 400 ms
Stabilized voltage -0.3 to +7 V
Supply voltage transient -10 to +10 V/µs
Pin voltage
-24 to +36
-24 to +40
V
-24 to VS V
-24 to VCC V
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
T
JSDon
T
JSDoff
R
th j-amb
Temperature K shutdown switch on threshold 160 - 200 °C
Temperature K shutdown switch off threshold 150 - 200 °C
Thermal steady state junction to ambient resistance 130 155 180 °C/W

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 T
temperature
JSDon
shutdown switch-on-threshold.

Table 5. Electrical characteristics

Symbol Parameter Test condition Min. Typ. Max. Unit
V
V
CC
T
I
CC
4/15 Doc ID 1765 Rev 7
Supply voltage - 4.5 - 36 V
S
Stabilized voltage see note
Junction temperature - -40 - 150 °C
j
V
CC
Supply VCC current
VK ≥ VK VTX = V
(1)
357V
≤ 5.5 V; VLI,VTX = 0 V - 1.4 2.3 mA
; VLI ≥ VLI
high
@ VCC ≤ 5.5 V
CC
high
-5 <1 5 µA
L9637 Electrical specification
Table 5. Electrical characteristics (continued)
Symbol Parameter Test condition Min. Typ. Max. Unit
IS
IS
IS
VK
VK
V
RK
OFF
Khys
I
Koff
ON
SB
low
high
ON
V
Supply VS current
VK ≥ VK VTX ≥ VTX
VCC ≤ 0.5 V @ VS ≤ 12 V - <1 - µA
RX output status LOW
4.5 V ≤ VS ≤ 18 V
Input voltage low state
RX output status LOW 18 V < VS
RX output status HIGH
4.5 V ≤ VS ≤ 18 V
Input voltage high state
RX output status HIGH 18 V < VS
Input threshold hysteresis VK
@ VTX ≥ VTX
Input current
VK ≤ V
@ V
Output ON impedance
VTX ≤ VTX IK ≥ 7 mA
≤ 16 V; VLI, VTX = 0 V - 1.2 3 mA
S
; VLI ≥ VLI
high
high
@ VS ≤ 12 V
high
- 120 220 µA
-24 - 0.45V
S
-24 - 8 V
- VK
high
low
; VS, VCC ≥ 0 or
S
V
S
≥ 6.5 V
S
low
(2)
0.55V
12 - V
-
high
-5 4 25 µA
, VCC = open
-1030Ω
-VSV
S
0.025 V
S
S
0.8 V
V
V
IK
VTX
VTX
RRX RLO
IRX
ILO
VRX VLO
RLO RRX
SC
Short circuit current 30 60 100 mA
Input voltage LOW state -24 - 1 V
low
Input voltage HIGH state 2.5 - V
high
ON
Output ON impedance
ON
SC
Output short circuit current 9 20 35 mA
SC
H
Output voltage HIGH state
H
VK ≤ VK
≥ 6.5 V I
V
S
10MΩ ≤ R 10MΩ ≤ R
; VLI ≤ VLI
low
RX, LO
LRX
LLO
Output status = (HIGH)
Output pull-up resistance
-0.15 V ≤ VLO ≤ V
-0.15 V ≤ VRX ≤ V
RTX Input pull up resistance -0.15 V ≤ VTX ≤ V
LO output status LOW
VLI
Input voltage LOW state
low
4.5 V ≤ VS ≤ 18 V LO output status LOW 18 V < V
low
≥ 1 mA
+ 0.15 V
CC
+ 0.15 V
CC
+ 0.15 V 10 20 40 kΩ
CC
-
V
CC
0.25
-
40 90
VCC-
0.1
51020kΩ
-24
-24
S
- 0.45V
CC
V
Ω
VCC-V
V
S
8
Doc ID 1765 Rev 7 5/15
Electrical specification L9637
Table 5. Electrical characteristics (continued)
Symbol Parameter Test condition Min. Typ. Max. Unit
LO output status HIGH
VL
high
Input voltage HIGH state
4.5 V ≤ VS ≤ 18 V LO output status HIGH 18 V < V
VLI
ILI Input current
C
Ki,LO,RX
f
LI-LO
f
K-RX
f
TX-k
t
rLI-LO
t
rK-RX
t
rTX-K
t
fLI-LO
t
fK-RX
t
fTX-K
t
OFF,LI-LO
t
OFF,K-RX
t
OFF,TX-K
t
ON,LI-LO
t
ON,K-RX
t
ON,TX-K
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.
Input threshold hysteresis VLI
hys
high
VLI ≤ V
- VLI
low
, VCC ≥ 0 or
S VS
, VCC = open
V
S
Internal output capacities - - 20 pF
9 V < VS < 16 V (external loads)
Transmission frequency
RKO = 510 Ω, CK ≤ 1.3 nF in active mode see Figure 5
Rise time
for the definition of t
, tf see
r
Figure 3
9 V < V
Fall time - 2 6 µs
Switch OFF time
RKO = 510 Ω, CK ≤ 1.3 nF
for the definition of ton, t
< 16 V (external loads)
S
see
OFF
Figure 3.
9 V < V
< 16 V (external loads)
S
RKO = 510 Ω, CK ≤ 1.3 nF
Switch ON time - 4 17 µs
(inactive mode see Figure 5)
0.55V 12
S
- 0.025V
-5 4 25 µA
- - 50 kHz
-26µs
- 4 17 µs
-V
S
S
S
0.8 V
V
6/15 Doc ID 1765 Rev 7
L9637 Electrical specification

Figure 3. Input to output timings and output pulse shape

V
I
t
V
OUT
80% 80%
20%
t
OFF
20%
t
r
t
ON
t
f
t
Doc ID 1765 Rev 7 7/15
Electrical specification L9637

Figure 4. ISO application circuit

510 Ohm
0.4 Ohm
VS
Diagnostic
Tester
VS
40V
R
KO
K
K
C
K
IK
OFF
-
+
RTX RLO RRX
-
+
1,75V
LI
L
ILI
-
+
VCC
TX
RX
LO
GND
5V
VCC
I/O
I/O
uP
I/O
VDD
ECU1
K Line
L Line
K
C
K
LI
ECU2
8/15 Doc ID 1765 Rev 7
L9637 Functional description

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
with her integrated pull up resistances. Also the L
CC
comparator output LO has a pull up resistance connected to V
The maximum external pull up resistance at K related to V
t related diagnosis bus. It also
Ba
.
CC
should not be higher than RKO ≤
S
t bus. The input
Ba
5 kΩ to achieve clear output ON conditions.
All V
bus defined inputs LI and K have supply voltage dependent thresholds together with
Bat
sufficient hysteresis to suppress line spikes. These pins are protected against overvoltages, shorts to GND and V
and can also be driven beyond VS and GND.
S
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
undervoltage conditions the outputs will be switched OFF and stay at high impedance.
S
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
related bus line LI and
S
or GND all
S
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
≤ 0.5 V make this device high efficient for automotive bus system.
CC
≤ 1 µA during system de
SB typ
≤ 120 µA, and a
off typ
After wake up of the system from OFF or SB condition the first output signal will have an additional delay time td
≤ 5 µs see also Figure 5.
typ
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 R
ON
* I
OUT
to I
* 2 * RON + UBE state. This variation occurs due to too
OUT
low output current or after a negative transient forced to the output or to the supply voltage line.
Doc ID 1765 Rev 7 9/15
Functional description L9637

Figure 5. Typical timing for mode transitions

OFF active activeOFF
LI
LO
TX
RX
K
tdt
ON
LI - LO
tdt
ON
TX - K
10/15 Doc ID 1765 Rev 7
L9637 Functional description

Figure 6. Output characteristics at K, LO, RX

I
OUT
I
OUT
MIN
I
V
=
N
O S D
R
OUT
R
OUT DSON
*
protection diode
V
I
=
OUT
OUT DSON
0.8V

Figure 7. Output signal shape related to output current

V
IN
V
OUT
I
2
**
OUT DSON
+ U
R
I
R
OUT DSON
*
BE
I
I
OUT
>
I
OUT
MIN
I
OUT
I
<
OUT
MIN
OUT
2
**
>
I
OUT
+ U
R
MIN
BE
V
OUT
t
t
Doc ID 1765 Rev 7 11/15
Functional description L9637

Figure 8. EMS performance (ISO 9141 bus system)

VS = 12V
=
510 Ohm
50 Ohm
10kHz
D
Signal comparison
10%
D£
Δ≤±
10%
VS
TX K
IS O in terfa ce
VS
RX
IS O in terfa ce
136 Ohm
1.5nF
K

Figure 9. Input power vs. frequency diagram

P
i (m W)
10000
5000
not incident power resistant
68 Ohm
Probe
NAP - 73
P
i
NAP
40dB
P
ima x
= 5W
Rhode
&
SMG
0.1 - 1000MHz
Schw artz
1000
incident power resistant
100
1 10 100 1000
12/15 Doc ID 1765 Rev 7
f
(M Hz)
L9637 Package information

4 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

DIM.
A 1.750 0.0689
A1 0.100 0.250 0.0039 0.0098
A2 1.250 0.0492
b 0.280 0.480 0.0110 0.0189
c 0.170 0.230 0.0067 0.0091
(1)
D
E 5.800 6.000 6.200 0.2283 0.2362 0.2441
(2)
E1
e 1.270 0.0500
h 0.250 0.500 0.0098 0.0197
L 0.400 1.270 0.0157 0.0500
L1 1.040 0.0409
k0˚8˚0˚8˚
ccc 0.100 0.0039
Notes: 1. Dimensions D does not include mold flash,
2. Dimension “E1” does not include interlead flash
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
4.800 4.900 5.000 0.1890 0.1929 0.1969
3.800 3.900 4.000 0.1496 0.1535 0.1575
protrusions or gate burrs. Mold flash, po trusions or gate burrs shall not exceed 0.15m m in total (bot h side).
or protrusions. Interlead flash or protrusions shall not exceed 0.25 mm per side.
OUTLINE AND
MECHANICAL DATA
SO-8
0016023 D
Doc ID 1765 Rev 7 13/15
Revision history L9637

5 Revision history

Table 6. Document revision history

Date Revision Changes
24-Jan-2002 5 Initial release.
Document reformatted.
07-Nov-2008 6
15-Jun-2009 7
Added Table 1: Device summary on page 1. Updated Section 4: Package information on page 13.
Updated the values of “stabilized voltage” and “transmission frequency” parameters on Table 5: Electrical characteristics.
14/15 Doc ID 1765 Rev 7
L9637
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries.
Information in this document supersedes and replaces all information previously supplied.
The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
© 2009 STMicroelectronics - All rights reserved
STMicroelectronics group of companies
Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -
Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America
www.st.com
Doc ID 1765 Rev 7 15/15
Loading...
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use