L9637 ISO 9141 INTERFACE

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1 L9637 ISO 9141 INTERFACE OPERATING POWER SUPPLY VOLTAGE RANGE 4.5V VS 36V (40V FOR TRAN- SIENTS) REVERSE SUPPLY (BATTERY) PRO- TECTED DOWN TO V S -24V STANDBY MODE WITH VERY LOW CUR- RENT CONSUMPTION ISSB 0.5V LOW QUIESCENT CURRENT IN OFF CON- DITION IS OFF = 120µA TTL COMPATIBLE TX INPUT BIDIRECTIONAL -I/O PIN WITH SUPPLY VOLTAGE DEPENDENT INPUT THRESHOLD OVERTEMPERATURE SHUT DOWN FUNC- TION SELECTIVE TO -I/O PIN WIDE INPUT AND OUTPUT VOLTAGE RANGE -24V V V S OUTPUT CURRENT LIMITATION, TYP I = 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 V S OR GND CONNECTION SO8 ORDERING NUMBERS: L9637D Minidip L9637 DEFINED OUTPUT ON STATUS OF LO OR RX FOR OPEN LI OR INPUTS DEFINED 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. BLOC DIAGRAM VS RTX RLO RRX VCC I OFF - + 1,75V TX - + RX LI IL I - + LO GND December /11

2 ABSOLUTE MAXIMUM RATINGS (No damage or latch) Symbol Parameter Value Unit V S Supply Voltage ISO transients t = 400ms -24 to to +40 VCC Stabilized Voltage -0.3 to +7 V V S /dt Supply Voltage transient -10 to +10 V/µs V LI, Pin Voltage -24 to V S V V LO, RX, TX Pin Voltage -24 to V CC 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. V V PIN CONNECTION (Top view) RX 1 8 LI LO 2 7 VS U537 VCC 3 6 TX 4 5 GND THERMAL DATA Symbol Parameter Min. Typ. Max. Unit T JSDon T JSDoff R th j-amb Temperature shutdown switch on threshold Temperature shutdown switch off threshold Thermal steady state junction to ambient resistance for SO8 Thermal steady state junction to ambient resistance for Minidip C C C/W C/W PIN DESCRIPTION N. Name Function 1 RX Output for as input 2 LO Output L comparator 3 VCC Stabilized voltage supply 4 TX Input for as output 5 GND Common GND 6 Bidirectional I/O 7 VS Supply voltage 8 LI Input L comparator 2/11

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.) Symbol Parameter Test Condition Min. Typ. Max. Unit VS Supply Voltage V V CC Stabilized Voltage 3 7 V T j Junction temperature C I CC Supply V CC Current V CC 5.5V; VLI,VTX = 0V ma V V high ; VLI VLI high -5 <1 5 µa VTX = V CC 5.5V IS ON Supply VS Current V S 16V; VLI, VTX = 0V ma ISOFF V Vhigh; VLI VLIhigh µa VTX VTX S 12V IS SB V CC V S 12V <1 µa V low Input Voltage Low state RX output status LOW V S V 4.5V V S 18V RX output status LOW V 18V < V S V high Input Voltage High state RX output status HIGH 0.55V S V S V 4.5V V S 18V RX output status HIGH 12 V S V 18V < VS V hys Input Threshold Hysteresis V high -V low V V S I off Input VTX VTX high µa V V S V S,V CC 0 or V S,V CC = open R ON Output ON V S 6.5V VTX VTX low I 7mA 1) Ω 9 I SC Short Circuit Current ma VTXlow Input voltage LOW state V VTX high Input voltage HIGH state 2.5 V CC V RRX ON Output ON Impedance RLO ON V V low ;VLI VLI low V S 6.5V I RX, LO 1mA 1) Ω IRX SC Output Short Circuit Current ma ILO SC VRXH Output Voltage HIGH state 10MΩ RLRX VLO H 10MΩ R LLO V CC RLO RRX Output pull-up resistance Output status = (HIGH) -0.15V VLO VCC V -0.15V VRX V CC V V CC V CC V Ω RTX Input pull up resistance -0.15V VTX V CC V Ω VLI low Input voltage LOW state LO output status LOW V S V 4.5V V S 18V LO output status LOW 18V < V S V VLhigh Input voltage HIGH state LO output status HIGH 0.55VS VS V 4.5V V S 18V LO output status HIGH 18V < V S 12 VS V VLI hys Input threshold hysteresis VLI high - VLI low 0.025V S 0.8 V ILI Input current VLI V S V S,V CC 0 or V S,V CC = open µa 3/11

4 ELECTRICAL CHARACTERISTIC (continued) Symbol Parameter Test Condition Min. Typ. Max. Unit C i, LO, RX Internal output capacities 20 pf f LI-LO f-rx f TX-k Transmission Frequency 9V < V S < 16V (external loads) R O = 510Ω, C 1.3nF in active mode see Fig khz t rli-lo tr-rx t rtx- t fli-lo t f-rx tftx- t OFF,LI-LO t OFF,-RX t OFF,TX- t ON,LI-LO t ON,-RX t ON,TX- Rise Time Fall Time Switch OFF time Switch ON time for the definition of tr, t f see Fig.1. 9V < V S < 16V (external loads) R O = 510Ω, C 1.3nF for the definition of ton, t OFF see Fig.1. 9V < VS < 16V (external loads) R O = 510Ω, C 1.3nF (inactive mode see Fig. 3) 1) For output currents lower than this value a series protection diode can become active. See also Fig. 4 and µs 2 6 µs 4 17 µs 4 17 µs Figure 1: Input to Output Timings and Output Pulse Shape. V I t V OUT 80% 80% 20% 20% t r t f t t OFF t ON 4/11

5 Figure 2: ISO Application Circuit VS VCC VS 40V RTX RLO RRX 5V R O 510 Ohm - C + I OFF 1,75V TX I/O VCC 0.4 Ohm Diagnostic Tester - + RX I/O up L LI ILI - + LO I/O GND VDD ECU1 Line L Line C 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, to the VBat related diagnosis bus. It also includes a separate comparator L which is also able to be linked to the V Bat bus. The input TX and output RX of 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 related to VS should not be higher than RO 5Ω to achieve clear output ON conditions. All VBat bus defined inputs LI and have supply voltage dependent thresholds together with sufficent 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 output if the chip temperature increases above the thermal shut down threshold. To reactivate again the chip temperature must decrease below the 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 V S related bus line LI and the outputs LO and RX shows defined ON status. 5/11

6 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 >50baud, controlled output slopes for low EMI, a wide power supply voltage range and a very small quiescent current during OFF (TX LI =High) condition ISoff typ 120µA, and a real standby function with zero power consumption IS SB typ 1µA 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 5µs see also Fig. 3. The typical output voltage behaviour for the, 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. OFF active OFF active LI LO TX RX t d t ON LI - LO t d t ON TX - 6/11

7 Figure 4: Output Characteristics at, LO, RX. I OUT I OUT MIN DS ON R V OUT = I OUT * R DSON protection diode V OUT = I OUT 2 * * R DSON + U BE 0.8V V OUT Figure 5: Output Signal Shape Related to Output Current. V IN t V OUT I OUT 2 * * R DSON I OUT + U BE R * DSON I OUT > I OUT MIN I OUT < I OUT MIN I OUT > I OUT MIN t 7/11

8 Figure 6: EMS Performance (ISO 9141 BUS system). = VS = 12V 510 Ohm 50 Ohm VS 10kHz TX IS O i nte rface 136 Ohm Probe NAP dB Rhode & Schwartz SMG 1.5nF P ima x = 5W MHz 68 Ohm D VS P i RX Signal comparison ± D 10% 10% IS O i nte rface NAP Figure 7. P i(m W ) not incident power resistant incident power resistant f (M H z) 8/11

9 DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. A a a a b b C c1 45 (typ.) D (1) E e e F (1) L M S 8 (max.) OUTLINE AND MECHANICAL DATA SO8 (1) D and F do not include mold flash or protrusions. Mold flash or potrusions shall not exceed 0.15mm (.006inch). 9/11

10 mm inch DIM. MIN. TYP. MAX. MIN. TYP. MAX. A OUTLINE AND MECHANICAL DATA a B b b D E e e e F I L Z Minidip 10/11

11 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 1998 STMicroelectronics Printed in Italy All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - orea - Malaysia - Malta - Mexico - Morocco - The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United ingdom - U.S.A. 11/11

12 This datasheet has been download from: Datasheets for electronics components.

Description. Order code Package Packing. L9637D SO8 Tube L9637D013TR SO8 Tape and reel E-L9637D (1) E-L9637D013TR (1) SO8 Tape and reel

Description. Order code Package Packing. L9637D SO8 Tube L9637D013TR SO8 Tape and reel E-L9637D (1) E-L9637D013TR (1) SO8 Tape and reel Monolithic bus driver with ISO 9141 interface Features Operating power supply voltage range 4.5 V V S 36 V (40 V for transients) Reverse supply (battery) protected down to V S -24 V Standby mode with very