L9637D ® 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 ORDERING NUMBER: L9637D 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 L9637D is a monolithic integrated circuit containing standard ISO 9141 compatible interface functions. BLOCK DIAGRAM VCC VS RTX K IK + OFF IL I RRX TX 1,75V + LI RL O + RX LO GND September 2002 1/10 L9637D ABSOLUTE MAXIMUM RATINGS (No damage or latch) Symbol Parameter Supply Voltage ISO transients t = 400ms VS VCC ∆VS/dt Value Unit -24 to +36 -24 to +40 V V Stabilized Voltage -0.3 to +7 V 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 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 130 PIN DESCRIPTION N. Name 1 RX 2 3 LO VCC 4 TX 5 GND Common GND 6 7 K VS Bidirectional I/O Supply voltage 8 LI Input L comparator 2/10 Function Output for K as input Output L comparator Stabilized voltage supply Input for K as output Typ. 155 Max. Unit 200 200 °C °C °C/W 180 L9637D 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 VS Supply Voltage VCC Tj Stabilized Voltage ICC Supply VCC Current VCC ≤ 5.5V; VLI,VTX = 0V Supply VS Current VK ≥ VKhigh; VLI ≥ VLIhigh VTX = VCC @ VCC ≤ 5.5V VS ≤ 16V; VLI, VTX = 0V Min. Junction temperature Typ. Max. Unit 4.5 36 V 3 7 V -40 150 °C 1.4 2.3 mA <1 5 µA -5 1.2 3 mA ISOFF VK ≥ VKhigh; VLI ≥ VLIhigh VTX ≥ VTXhigh @ VS ≤ 12V 120 220 µA ISSB VCC ≤ 0.5V @ VS ≤ 12V <1 ISON VKlow VKhigh VKhys IKoff Input Voltage Low state Input Voltage High state µA RX output status LOW 4.5V ≤ VS ≤ 18V -24 0.45VS V 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 60 100 mA Input Threshold Hysteresis VKhigh - VKlow Input Current @ VTX ≥ VTXhigh VK ≤ VS VS, VCC ≥ 0 VS, VCC = open -5 or @ VS ≥ 6.5V VTX ≤ VTXlow IK ≥ 7mA 1) RKON Output ON Impedance IKSC Short Circuit Current 30 VTXlow Input voltage LOW state -24 1 V VTXhigh RRXON RLOON Input voltage HIGH state Output ON Impedance 2.5 VCC V 40 90 Ω 9 20 35 mA VCC 0.25 VCC 0.1 VCC V 5 10 20 KΩ 20 VK ≤ VKlow; VLI ≤ VLIlow VS ≥ 6.5V IRX, LO ≥ 1mA 1) IRXSC ILOSC VRXH VLOH Output Short Circuit Current RLO RRX Output pull-up resistance RTX Input pull up resistance -0.15V ≤ VTX ≤ VCC + 0.15V 10 40 KΩ VLIlow Input voltage LOW state LO output status LOW 4.5V ≤ VS ≤ 18V LO output status LOW 18V < VS -24 0.45VS V -24 8 V 0.55VS VS V LO output status HIGH 18V < VS VLIhigh - VLIlow 12 0.025VS VS 0.8 V V or VLI ≤ VS VS, VCC ≥ 0 VS, VCC = open -5 4 25 µA VLhigh VLIhys ILI Output Voltage HIGH state Input voltage HIGH state Input threshold hysteresis Input current 10MΩ ≤ RLRX 10MΩ ≤ RLLO Output status = (HIGH) -0.15V ≤ VLO ≤ VCC + 0.15V -0.15V ≤ VRX ≤ VCC + 0.15V LO output status HIGH 4.5V ≤ VS ≤ 18V 3/10 L9637D ELECTRICAL CHARACTERISTIC (continued) Symbol Parameter Test Condition 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 tON,LI-LO tON,K-RX tON,TX-K Min. 9V < VS < 16V (external loads) RKO = 510Ω, CK ≤ 1.3nF in active mode see Fig. 3 Switch OFF time 50 Typ. pF kHz 2 6 µs 9V < VS < 16V (external loads) RKO = 510Ω, CK ≤ 1.3nF 2 6 µs for the definition of ton, tOFF see Fig.1. 4 17 µs 4 17 µs Figure 1: Input to Output Timings and Output Pulse Shape. VI t VOUT 80% 80% 20% 20% tr 4/10 20 for the definition of tr, tf see Fig.1. 1) For output currents lower than this value a series protection diode can become active. See also Fig. 4 and 5. t OFF Unit 100 9V < VS < 16V (external loads) RKO = 510Ω, CK ≤ 1.3nF (inactive mode see Fig. 3) Switch ON time Max. tf t ON t L9637D 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 L9637D 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 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. 5/10 L9637D 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 ti v e O FF a c tiv e LI LO TX K RX td 6/10 t ON LI - LO td t ON TX - K L9637D 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 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 VO UT Figure 5: 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 7/10 L9637D Figure 6: 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 136 Ohm NAP - 73 S MG 1 0k H z 1 .5 n F P im a x = 5 W 0 .1 - 1 0 0 0 M H z 68 Ohm VS Pi D RX K IS O i n te rfa c e NAP Signal comparison 10% D£ 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 10000 5000 in c id e n t p o w e r r e s is t a n t 1000 100 1 8/10 10 100 1000 f (M H z) L9637D mm DIM. MIN. TYP. A a1 inch MAX. MIN. TYP. 1.75 0.1 0.25 a2 MAX. 0.069 0.004 0.010 1.65 0.065 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). 9/10 L9637D 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. 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