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(R)
L9637
ISO 9141 INTERFACE
OPERATING POWER SUPPLY VOLTAGE RANGE 4.5V VS 36V (40V FOR TRANSIENTS) REVERSE SUPPLY (BATTERY) PROTECTED DOWN TO VS -24V STANDBY MODE WITH VERY LOW CURRENT CONSUMPTION ISSB 1A @ VCC 0.5V LOW QUIESCENT CURRENT IN OFF CONDITION ISOFF = 120A 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 -24V VK VS K OUTPUT CURRENT LIMITATION, TYP IK = 60mA DEFINED OFF OUTPUT STATUS IN UNDERVOLTAGE CONDITION AND VS OR GND INTERRUPTION CONTROLLED OUTPUT SLOPE FOR LOW EMI HIGH INPUT IMPEDANCE FOR OPEN VS OR GND CONNECTION BLOCK DIAGRAM
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 containing standard ISO 9141 compatible interface functions.
VCC VS
RTX RL O RRX
K
IK OFF
+
1, 75 V
TX
+
LI
IL I
RX
+
LO
GND
December 1998
1/11
L9637
ABSOLUTE MAXIMUM RATINGS (No damage or latch)
Symbol VS VCC VS/dt VLI, K VLO, RX, TX Supply Voltage ISO transients t = 400ms Stabilized Voltage Supply Voltage transient Pin Voltage Pin Voltage Parameter Value -24 to +36 -24 to +40 -0.3 to +7 -10 to +10 -24 to VS -24 to VCC Unit V V V V/s V 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.
PIN CONNECTION (Top view)
RX
1
8 LI
LO
2 U537
7 VS
VCC
3
6K
TX
4
5 GND
THERMAL DATA
Symbol TJSDon TJSDoff Rth j-amb Parameter Temperature K shutdown switch on threshold Temperature K shutdown switch off threshold Thermal steady state junction to ambient resistance for SO8 Thermal steady state junction to ambient resistance for Minidip Min. 160 150 130 80 155 100 Typ. Max. 200 200 180 120 Unit C C C/W C/W
PIN DESCRIPTION
N. 1 2 3 4 5 6 7 8 Name RX LO VCC TX GND K VS LI Output for K as input Output L comparator Stabilized voltage supply Input for K as output Common GND Bidirectional I/O Supply voltage Input L comparator Function
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L9637
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.)
Symbol VS VCC Tj ICC Parameter Supply Voltage Stabilized Voltage Junction temperature Supply VCC Current VCC 5.5V; VLI,VTX = 0V VK VKhigh; VLI VLIhigh VTX = VCC @ VCC 5.5V VS 16V; VLI, VTX = 0V VK VKhigh; VLI VLIhigh VTX VTXhigh @ VS 12V VCC 0.5V @ VS 12V Input Voltage Low state RX output status LOW 4.5V VS 18V RX output status LOW 18V < VS VKhigh Input Voltage High state RX output status HIGH 4.5V VS 18V RX output status HIGH 18V < VS VK hys IKoff Input Threshold Hysteresis Input Current VKhigh - VKlow @ VTX VTXhigh VK VS VS, VCC 0 VS, VCC = open @ VS 6.5V VTX VTXlow IK 7mA 1) 30 -24 2.5 VK VKlow; VLI VLIlow VS 6.5V IRX, LO 1mA 1) 9 10M R LRX 10M R LLO Output status = (HIGH) -0.15V VLO VCC + 0.15V -0.15V VRX VCC + 0.15V -0.15V VTX VCC + 0.15V LO output status LOW 4.5V VS 18V LO output status LOW 18V < VS VL high Input voltage HIGH state LO output status HIGH 4.5V VS 18V LO output status HIGH 18V < VS VLI hys ILI Input threshold hysteresis Input current VLIhigh - VLIlow VLI VS VS, VCC 0 or VS, VCC = open -5 40 20 -5 or 10 30 -24 -24 0.55VS 12 0.025 VS 4 Test Condition Min. 4.5 3 -40 1.4 -5 <1 1.2 120 <1 0.45VS 8 VS VS 0.8 25 Typ. Max. 36 7 150 2.3 5 3 220 Unit V V C mA A mA A A V V V V V A
ISON ISOFF ISSB VKlow
Supply VS Current
RKON
Output ON Impedance
IKSC VTXlow VTXhigh RRXON RLOON IRXSC ILOSC VRX H VLOH RLO RRX RTX VLIlow
Short Circuit Current Input voltage LOW state Input voltage HIGH state Output ON Impedance Output Short Circuit Current Output Voltage HIGH state
60
100 1 VCC 90 35
mA V V mA
VCC 0.25 5 10 -24 -24 0.55VS 12
VCC 0.1 10 20
VCC
V
Output pull-up resistance
20 40 0.45VS 8 VS VS
K K V V V V V A
Input pull up resistance Input voltage LOW state
0.025V S 4
0.8 25
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L9637
ELECTRICAL CHARACTERISTIC (continued)
Symbol C Ki, LO, RX fLI-LO fK-RX fTX-k trLI-LO trK-RX trTX-K tfLI-LO tfK-RX tfTX-K tOFF,LI-LO tOFF,K-RX tOFF,TX-K tON,LI-LO tON,K-RX tON,TX-K Parameter Internal output capacities Transmission Frequency 9V < VS < 16V (external loads) R KO = 510, CK 1.3nF in active mode see Fig. 3 for the definition of tr, tf see Fig.1. 9V < VS < 16V (external loads) R KO = 510, CK 1.3nF for the definition of ton, tOFF see Fig.1. 9V < VS < 16V (external loads) R KO = 510, CK 1.3nF (inactive mode see Fig. 3) Test Condition Min. Typ. Max. 20 Unit pF
50
100
kHz
Rise Time
2
6
s s s s
Fall Time
2
6
Switch OFF time
4
17
Switch ON time
4
17
1) For output currents lower than this value a series protection diode can become active. See also Fig. 4 and 5.
Figure 1: Input to Output Timings and Output Pulse Shape.
V I
t
VOUT
80%
80%
20%
20%
tr t t ON
tf
t
OFF
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L9637
Figure 2: ISO Application Circuit
VS
RTX RLO RRX
VCC
VS
40V R KO
-
5V
TX
VCC I/O
510 Ohm
K
CK K
+ IK OFF 1,75V
0.4 Ohm
Diagnostic Tester LI
+
RX
I/O uP
LO
+
I/O
L
ILI
GND
VDD
ECU1
K Line
L Line K CK LI
ECU2
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 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 V S 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.
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L9637
Supressing all 4 classes of "Schaffner" signals all pins can be load with short energy pulses of max. 0.2mJ. 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 120A, and a real standby function with zero power consumption ISSB typ 1A during system depowering VCC 0.5V 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 5s see also Fig. 3. The typical output voltage behaviour for the K, LO, RX outputs as a function of the output current is shown in Fig.4. Fig.5 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.
Figure 3: Typical timing for mode transitions.
O FF
a c tiv e
O FF
a c tiv e
LI
LO
TX
K
RX
t d t ON LI - LO
td
t ON
TX - K
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L9637
Figure 4: Output Characteristics at K, LO, RX.
IO UT
IOUT
M IN V OUT = IO U T * R D S O N
R
DS ON
p ro te c tio n d i o d e
V OUT
= IO U T * 2 * R D SO N + U B E VO UT
0 .8 V
Figure 5: Output Signal Shape Related to Output Current.
V IN
t
VO UT
IOUT
* 2 * RDSON + U BE IO UT RDSON * IO U T > IO U T M IN IOUT > IOUT M IN I O U T < IO U T M IN t
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L9637
Figure 6: EMS Performance (ISO 9141 BUS system).
=
VS = 12V
510 Ohm
VS 50 Ohm TX IS O i n te rf a c e K 136 Ohm N A P - 73 SMG 10k Hz 1 . 5n F P im a x = 5 W 0 .1 - 1 0 0 0M H z P ro b e 4 0dB R h o d e & S c h w a rt z
68 Ohm
VS
D
Pi K
RX IS O i n te rf a c e Signal comparison
NAP
10% % D 10
Figure 7.
P i(m W )
1 0000
n o t i n c id e n t p o w e r re s i s ta n t
50 00
10 00
in c id e n t p o w e r r e s is t a n t
10 0 1 10 10 0 1 0 00 f (M H z)
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L9637
mm MIN. A a1 a2 a3 b b1 C c1 D (1) E e e3 F (1) L M S 3.8 0.4 4.8 5.8 1.27 3.81 4.0 1.27 0.6 8 (max.) 0.15 0.016 0.65 0.35 0.19 0.25 0.1 TYP. MAX. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 0.026 0.014 0.007 0.010 0.004 MIN. inch TYP. MAX. 0.069 0.010 0.065 0.033 0.019 0.010 0.020
DIM.
OUTLINE AND MECHANICAL DATA
45 (typ.) 5.0 6.2 0.189 0.228 0.050 0.150 0.157 0.050 0.024 0.197 0.244
SO8
(1) D and F do not include mold flash or protrusions. Mold flash or potrusions shall not exceed 0.15mm (.006inch).
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L9637
DIM. MIN. A a1 B b b1 D E e e3 e4 F I L Z 3.18 7.95 2.54 7.62 7.62 6.6 5.08 3.81 1.52 0.125 0.51 1.15 0.356 0.204 1.65 0.55 0.304 10.92 9.75 0.313 0.100 0.300 0.300 0.260 0.200 0.150 0.060 mm TYP. 3.32 0.020 0.045 0.014 0.008 0.065 0.022 0.012 0.430 0.384 MAX. MIN. inch TYP. 0.131 MAX.
OUTLINE AND MECHANICAL DATA
Minidip
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L9637
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (c) 1998 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com
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