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L9637D Datasheet(PDF) 5 Page - STMicroelectronics |
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L9637D Datasheet(HTML) 5 Page - STMicroelectronics |
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5 / 11 page  FUNCTIONAL DESCRIPTION The L9637 is a monolithic bus driver designed to provide bidirectional serial communication in auto- motive 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 re- lated 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 under- voltage 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 im- pedance characteristic. To realize a lack of the VS related bus line LI and K the outputs LO and RX shows defined ON status. 40V uP I/O I/O I/O 5V VCC VDD ECU1 ECU2 K L LI K VS TX RX LO GND LI VS VCC K 1,75V RTX RLO RRX 510 Ohm Diagnostic Tester ILI C K 0.4 Ohm - + - + IK OFF R KO C K - + Figure 2: ISO Application Circuit L9637 5/11 |
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Similar Description - L9637D |
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