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| SI9241EY Single-Ended Bus Transceiver Features D D D D D Single-Ended Transceiver Survives Shorts and Transients on Automotive Bus Wide Power Supply Voltage Range ISO 9141 Compatible Open Drain Fault Output Benefits D Single-Wire Multiplexer Interface D ISO Diagnosis Bus Applications D Automobiles D Trucks D Tractors Description The SI9241EY 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 VB voltage. A fault output provides an active low in case of a short circuit or an open load. In the event of an over temperature condition, the output is immediately switched off and a fault indicated. This condition can only be reset once the over temperature condition is removed, and CS is toggled high. For bi-directional communication, CS must be High for "receive" and Low for "transmit". If CS is Low, while IC is receiving data, an incorrect fault signal will occur. To inhibit the open load and short detect, tie CS and TX together. The SI9241EY is built on the Siliconix BiC/DMOS process. An epitaxial layer prevents latchup. The RX output is capable of driving CMOS or 1 LSTTL load. The SI9241EY is available in a space efficient 8-pin SO package. It operates reliably over the automotive temperature range (-40 to 125_C). Pin Configuration and Functional Block Diagram VDD VB Narrow Body SO Package VDD TX CS FAULT 1 2 3 4 8 7 6 5 RX VB K GND VB RX VDD - + 2 K CS TX Top View Order Number: SI9241EY FAULT Fault Detector GND Updates to this data sheet may be obtained via facsimile by calling Siliconix FaxBack, 1-408-970-5600. Please request FaxBack document #70013. Application Note AN602 may also be obtained via FaxBack, request document #70573. S-49719--Rev. E, 27-Sep-96 1 SI9241EY Output Table and State Diagrams Over Temp Power On A=1 Over Temp S CS Short Circuit Power On B=1 CS Open Circuit Power On C=1 CS C=0 B=0 A=0 Inputs CS 0 0 X 0 0 1 1 State Variable A 1 1 0 1 1 1 1 Output Table RX 0 1 K K K 0 1 TX 0 1 X X X X X B 1 1 1 0 1 1 1 C 1 1 1 1 0 1 1 K 0 1 HiZ HiZ HiZ 0 1 FAULT 1 1 0 0 0 1 1 Comments Over Temp Short Circuit Open Circuit Receive Mode X = "1" or "0" HiZ = High Impedance State Note: Over Temp is a condition and not meant to be a logic signal. Absolute Maximum Ratings Voltage Referenced to Ground Voltage On VBAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 V Voltage K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -16 V to (VB + 1 V) Voltage or Max. Current On Any Pin (Except VBAT , K) . . . . . . . . . . . . . . . -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 CS, TX Input Low Voltage CS, TX Input High Voltage VILT VIHT VOLK O VOHK tr, tf Rsi CO CINT IINT VDD = 5.5 V, VINT = 1.5 V, 3.5 V CS = 0 V, TX = 0 V CS = 0 V 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 Full Full Full -60 0.91 VBAT 9.6 110 20 10 -4 mA pF ms W 3.5 4.9 0.2 VBAT V 1.5 p g K Output Low Voltage CS, TX Input Current 2 S-49719--Rev. E, 27-Sep-96 SI9241EY Specifications Test Conditions Unless Otherw se Spec f ed Otherwise Specified Parameter Receiver K Input Low Voltage K Input High Voltage K Input Hysteresisd VILK VIHK VHYS VOLR VOHR IIHK CS = 4 V VILK = 0.33 VBAT IOLR = 1 mA VIHK = 0.70 VBAT IOHR = -40 mA VIHK = VBAT 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 RX Output Low Voltage RX High Voltage K Input Currents Supplies Bat Supply Current Logic Supply Current IBAT IDD Full CS, CS TX = 1 5 V K Open 1.5 V, Full 1 3.0 2.7 5.0 mA Miscellaneous Baud Rate Fault Output Low Voltage CS Minimum Pulse Widthd, e BR VOLF tcs RL = 510 W, CL = 10 nF CS = TX = 0V, K = VB, IOLF = 1 mA Full Full Full 1 10.4 0.4 kBaud V 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 (Transmit Only) VDD VB VB SI9241EY RL K TX CL 20% VK CS tr GND tf 20% 80% 80% S-49719--Rev. E, 27-Sep-96 3 SI9241EY Application Circuit ECU K-Line Diagnostic Tester VB 510 W I/Os Microcontroller 0.4 W SI9241EY L-Line VDD Bus SI9241EY ECU = Electronic Control Unit 4 S-49719--Rev. E, 27-Sep-96 |
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