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 1µA @ VCC 0.5V LOW QUIESCENT CURRENT IN OFF CONDITION ISOFF = 120µA 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 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. BLOCK DIAGRAM VCC VS RTX K IK + OFF IL I RRX TX 1, 75 V + LI RL O + RX LO GND December 1998 1/11 L9637 ABSOLUTE MAXIMUM RATINGS (No damage or latch) Symbol Parameter Value Unit VS Supply Voltage ISO transients t = 400ms -24 to +36 -24 to +40 V V VCC Stabilized Voltage -0.3 to +7 V ∆VS/dt Supply Voltage transient -10 to +10 V/µs VLI, K Pin Voltage -24 to VS V VLO, RX, TX Pin Voltage -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. PIN CONNECTION (Top view) RX 1 8 LI LO 2 7 VS U537 VCC 3 6 K TX 4 5 GND THERMAL DATA Symbol Parameter Min. TJSDon TJSDoff Temperature K shutdown switch on threshold Temperature K shutdown switch off threshold 160 150 Rth j-amb Thermal steady state junction to ambient resistance for SO8 Thermal steady state junction to ambient resistance for Minidip 130 80 PIN DESCRIPTION N. Name 1 RX Output for K as input Function 2 LO Output L comparator 3 VCC Stabilized voltage supply 4 TX 5 GND Common GND 6 K Bidirectional I/O 7 VS Supply voltage 8 LI Input L comparator 2/11 Input for K as output Typ. 155 100 Max. Unit 200 200 °C °C 180 120 °C/W °C/W 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 Parameter Max. Unit 4.5 36 V 3 7 V -40 150 °C 1.4 2.3 mA <1 5 µA VS ≤ 16V; VLI, VTX = 0V 1.2 3 mA ISOFF VK ≥ VKhigh; VLI ≥ VLIhigh VTX ≥ VTXhigh @ VS ≤ 12V 120 220 µA ISSB VCC ≤ 0.5V @ VS ≤ 12V <1 VS Supply Voltage VCC Stabilized Voltage Tj Junction temperature ICC Supply VCC Current ISON VKlow VKhigh VK hys IKoff Supply VS Current Input Voltage Low state Input Voltage High state Test Condition VCC ≤ 5.5V; VLI,VTX = 0V VK ≥ VKhigh; VLI ≥ VLIhigh VTX = VCC @ VCC ≤ 5.5V RX output status LOW 4.5V ≤ VS ≤ 18V -24 0.45VS RX output status LOW 18V < VS -24 8 V RX output status HIGH 4.5V ≤ VS ≤ 18V 0.55VS VS V RX output status HIGH 18V < VS 12 VS V 0.025 VS 0.8 V 4 25 µA 10 30 Ω 60 VKhigh - VKlow Input Current @ VTX ≥ VTXhigh VK ≤ VS VS, VCC ≥ 0 VS, VCC = open Output ON Impedance IKSC -5 Typ. µA V Input Threshold Hysteresis RKON Min. -5 or @ VS ≥ 6.5V VTX ≤ VTXlow IK ≥ 7mA 1) Short Circuit Current 30 100 mA VTXlow Input voltage LOW state -24 1 V VTXhigh Input voltage HIGH state 2.5 VCC V RRXON RLOON Output ON Impedance IRXSC ILOSC Output Short Circuit Current VRX H VLOH Output Voltage HIGH state RLO RRX Output pull-up resistance VK ≤ VKlow; VLI ≤ VLIlow VS ≥ 6.5V IRX, LO ≥ 1mA 40 90 9 20 35 Ω mA VCC 0.25 VCC 0.1 VCC V Output status = (HIGH) -0.15V ≤ VLO ≤ VCC + 0.15V -0.15V ≤ VRX ≤ VCC + 0.15V 5 10 20 KΩ -0.15V ≤ VTX ≤ VCC + 0.15V LO output status LOW 4.5V ≤ VS ≤ 18V 10 20 -24 1) 10MΩ ≤ R LRX 10MΩ ≤ R LLO RTX Input pull up resistance VLIlow Input voltage LOW state VL high Input voltage HIGH state VLI hys Input threshold hysteresis VLIhigh - VLIlow Input current VLI ≤ VS VS, VCC ≥ 0 or VS, VCC = open LO output status LOW 18V < VS LO output status HIGH 4.5V ≤ VS ≤ 18V LO output status HIGH 18V < VS ILI 40 KΩ 0.45VS V -24 8 V 0.55VS VS V 12 -5 VS V 0.025V S 0.8 V 4 25 µA 3/11 L9637 ELECTRICAL CHARACTERISTIC (continued) Symbol Parameter Test Condition C Ki, 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 Min. 9V < VS < 16V (external loads) R KO = 510Ω, CK ≤ 1.3nF in active mode see Fig. 3 50 Typ. kHz 6 µs 9V < VS < 16V (external loads) R KO = 510Ω, CK ≤ 1.3nF 2 6 µs for the definition of ton, tOFF see Fig.1. 4 17 µs 4 17 µs I t VOUT 80% 80% 20% 20% tf tr 4/11 pF 2 Figure 1: Input to Output Timings and Output Pulse Shape. OFF 20 for the definition of tr, tf see Fig.1. 9V < VS < 16V (external loads) R KO = 510Ω, CK ≤ 1.3nF (inactive mode see Fig. 3) t Unit 100 1) For output currents lower than this value a series protection diode can become active. See also Fig. 4 and 5. V Max. t ON t L9637 Figure 2: 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 VDD L Line K Line ECU1 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 ≤ 5KΩ 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. 5/11 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 ≤ 120µA, and a real standby function with zero power consumption ISSB 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 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 6/11 td t ON TX - K L9637 Figure 4: 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 SO N + U B E R DS ON IOUT p ro te c tio n d i o d e 0 .8 V VO UT 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 t IOUT > IOUT M IN I O U T < IO U T M IN 7/11 L9637 Figure 6: EMS Performance (ISO 9141 BUS system). = VS = 12V 510 Ohm VS 50 Ohm TX K P ro b e IS O i n te rf a c e 4 0dB R h o d e & S c h w a rt z 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 68 Ohm VS Pi D RX K IS O i n te rf a c e NAP Signal comparison ∆≤± D£ 10% 10 % Figure 7. 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 1 0000 50 00 in c id e n t p o w e r r e s is t a n t 10 00 10 0 1 8/11 10 10 0 1 0 00 f (M H z) L9637 mm DIM. MIN. TYP. A a1 inch MAX. MIN. TYP. 1.75 0.1 0.25 a2 MAX. 0.069 0.004 0.010 0.065 1.65 a3 0.65 0.85 0.026 0.033 b 0.35 0.48 0.014 0.019 b1 0.19 0.25 0.007 0.010 C 0.25 0.5 0.010 0.020 c1 45° (typ.) D (1) 4.8 5.0 0.189 0.197 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 3.81 0.150 F (1) 3.8 4.0 0.15 0.157 L 0.4 1.27 0.016 0.050 M S OUTLINE AND MECHANICAL DATA 0.6 0.024 SO8 8 ° (max.) (1) D and F do not include mold flash or protrusions. Mold flash or potrusions shall not exceed 0.15mm (.006inch). 9/11 L9637 mm DIM. MIN. A TYP. inch MAX. MIN. 3.32 TYP. MAX. 0.131 a1 0.51 B 1.15 1.65 0.045 0.065 b 0.356 0.55 0.014 0.022 b1 0.204 0.304 0.008 0.012 0.020 D E 10.92 7.95 9.75 0.430 0.313 0.384 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 6.6 0.260 I 5.08 0.200 L Z 10/11 3.18 OUTLINE AND MECHANICAL DATA 3.81 1.52 0.125 0.150 0.060 Minidip 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 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 11/11