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| SI9243EY Single-Ended Bus Transceiver Features D Single-Ended Transceiver D Survives Shorts and Transients on Automotive Bus D Wide Power Supply Voltage Range D Fault Detection D ISO 9141 Compatible Description The SI9243EY is a monolithic bus transceiver designed to provide bidirectional serial communication in automotive diagnostic applications. The device incorporates protection against overvoltages and short circuits to GND or VB. The transceiver pin is protected and can be driven beyond the VBAT voltage. The SI9243EY contains temperature and short circuit fault detection circuits. In the transmit mode, load shorts and opens are generally detected by the processor monitoring RXK and TX. When the two mirror each other there is no fault, but the SI9243EY will turn off the K output in the event of over temperature or short circuit to VBAT to protect the IC. The fault will be reset when TX toggles "high." TX is set "high" for receive only. The RX output is capable of driving CMOS or 1 LSTTL load. The SI9243EY is built on the Siliconix BiC/DMOS process. This process supports bipolar transistors, CMOS, and DMOS. An epitaxial layer prevents latchup. The SI9243EY is available in a 8-pin SO package and operates over the automotive temperature range (-40 to 125_C). Pin Configuration and Functional Block Diagram GND VDD VB + L + K L RXL Narrow Body SO Package RXK RXL VDD TX 1 2 3 4 8 7 6 5 L VBAT K GND RXK K + VBAT/2 K Top View Order Number: SI9243EY TX Logic Circuitry (See State Diagram and Truth Table) VDD Updates to this data sheet may be obtained via facsimile by calling Siliconix FaxBack, 1-408-970-5600. Please request FaxBack document #70017. Application Note AN602 may also be obtained via FaxBack, request document #70573. S-49720--Rev. E, 27-Sep-96 1 SI9243EY Output Table and State Diagrams Over Temp Inputs Power On A=1 Over Temp S TX Short Circuit Power On B=1 TX B=0 A=0 State Variable A 1 1 1 1 0 1 1 1 Output Table K 0 1 0 1 HiZ HiZ 1 0 TX 0 1 0 1 X 0 1 1 B 1 1 1 1 1 0 1 1 RXK 0 1 0 1 K 1 1 0 L 0 1 1 0 L L 1 0 RXL 0 1 1 0 L L 1 0 Comments Over Temp Short Circuit Receive Mode Note: Over Temp is a condition and not meant to be a logic signal. X = "1" or "0" HiZ = High Impedance State Absolute Maximum Ratings Voltage Referenced to Ground Voltage On VBAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 V Voltage K , L . . . . . . . . . . . . . . . . . . . . . . . . . . . -16 V to VBAT + 1 V Voltage On Any Pin (Except VBAT , K, L) or Max. Current . . . . . . . . . . . . . . . . -0.3 V to VDD + 0.3 V or 10 mA Voltage on VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Short Circuit Duration (to VBAT or GND) . . . . . . . . . . . . . Continuous Operating Temperature (TA) . . . . . . . . . . . . . . . . . . . . . -40 to 125_C Junction and Storage Temperature . . . . . . . . . . . . . . . . . . -55 to 150_C Thermal Resistance QJA . . . . . . . . . . . . . . . . . . . . . . . . . . . 125_C/W Specifications Test Conditions Unless Otherw se Spec f ed Otherwise Specified Parameter Symbol VDD = 4.5 to 5.5 V, VBAT = 7.25 to 35 V Limits E Suffix: -40 to 125_C Tempa Minb Typc Maxb Unit Transmitter and Logic Levels TX Input Low Voltage TX Input High Voltage VILT VIHT VOLK O VOHK tr, tf Rsi CO CINT IINT VDD = 5.5 V, TX = 1.5 V, 3.5 V TX = 0 V Full Full Full -60 20 10 -4 pF mA RL = 510 W, CL = 10 nF VBAT = 35 V, VDD = 4.5 V RL = 510 W CL = 10 nF W, F See Test Circuit Full Full Full Full K Output High Voltage K Rise, Fall Times K Output Sink Resistance K Output TX Input Capacitanced Capacitanced Full Full Full 0.91 VBAT 9.6 110 ms W 3.5 4.9 0.2 VBAT V 1.5 p g K Output Low Voltage TX Input Current 2 S-49720--Rev. E, 27-Sep-96 SI9243EY Specifications Test Conditions Unless Otherw se Spec f ed Otherwise Specified Parameter Receiver L and K Input Low Voltage L and K Input High Voltage L and K Input Hysteresisd VILK VIHK VHYS VOLR VOHR IIHK TX = 4 V VILK , VILL = 0.33 VBAT IOLR = 1 mA VIHK , VIHL = 0.70 VBAT IOHR = -40 mA VIHK = VB Full Full Full Full Full Full 4 1.5 20 mA 0.7 VBAT 0.1 VBAT V 0.4 0.4 VBAT 0.6 VBAT 0.33 VBAT Limits E Suffix: -40 to 125_C Symbol VDD = 4.5 to 5.5 V, VB = 7.25 to 35 V Tempa Minb Typc Maxb Unit RXL and RXK Output Low Voltage RXL and RXK High Voltage L and K Input Currents Supplies Bat Supply Current Logic Supply Current IBAT IDD TX = 1.5 V, K, L Open TX = 1.5 V, K, L Open Full Full 2.7 1 5.0 mA 3.0 Miscellaneous Baud Rate TX Minimum Pulse Widthd, e BR tTX RL = 510 W, CL = 10 nF Full Full 10.4 1 kBaud ms Notes a. Room = 25_C, Cold and Hot = as determined by the operating temperature suffix. b. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum, is used in this data sheet. c. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing. d. Guaranteed by design, not subject to production test. e. Minimum pulse width to reset a fault condition. Test Circuit VDD VBAT VBAT RL K TX 80% 80% CL 20% 20% SI9243EY GND VK tr tf S-49720--Rev. E, 27-Sep-96 3 SI9243EY Application Circuit ECU K-Line Diagnostic Tester VB 510 W I/Os Microcontroller 0.4 W L-Line VDD SI9243EY Bus ECU = Electronic Control Unit 4 S-49720--Rev. E, 27-Sep-96 |
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