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AN602 Datasheet(PDF) 2 Page - Vishay Siliconix |
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AN602 Datasheet(HTML) 2 Page - Vishay Siliconix |
2 / 3 page AN602 Vishay Siliconix www.vishay.com 2 Document Number: 70573 16-Jan-01 TX RXL K L + – L + – K + – VBAT/2 K Logic Circuitry (See State Diagram and Truth Table) VBAT VDD GND RXK VDD FIGURE 3. Si9243A K- and L-Line Driver Since the fault detection signal is not brought out, it is up to the user to determine if a fault has occurred. One method is to monitor the RxK and TX lines and ensure they are in phase. An exclusive OR can also perform the fault function. The fault condition is cleared when TX is set high. System Anomalies Two system anomalies in the automotive environment that the Si924x drivers may be subjected to are Reverse Battery and Ground Disconnect. The Si924x drivers have an integrated diode in the VBAT line to protect the device from reverse battery conditions. This diode will protect the IC to reverse batteries up to –24 V. Signal and Communication Specifications ISO 9141 specifies different logic levels for the Receiver and Transmitter. Receiver Logic Levels: Logic “0” v 0.3 * VBAT 0.7 * VBAT 3 Logic “1” Transmitter Logic Levels: Logic “0” v 0.2 * VBAT 0.8 * VBAT w Logic “1” The Vishay Siliconix drivers operate to the above specifications, but with a slightly tighter transmission requirement: Logic “1” minimum w 0.91*VBAT. A logic bit transition must be less than 10% of the total bit time. The transition time is measured between the 80% and 20% battery points. Bit time is defined as the time between the 50% battery points of consecutive rising and falling levels. FIGURE 4. Si9243EY Applications Circuit Regulator VIN VOUT GND VDD Logic Circuitry VBAT/2 VBAT VDD Micro Processor Car Battery RXL RXK TX K GND Si9243 K-Line L-Line BUS 510 W Diagnostic Tester VBAT 5 V |
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