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| INTEGRATED CIRCUITS AU5780 SAE/J1850/VPW transceiver Product specification Supersedes data of 1997 Dec 22 1998 Jun 30 Philips Semiconductors Philips Semiconductors Product specification SAE/J1850/VPW transceiver AU5780 FEATURES multiplexing * Supports SAE/J1850 VPW standard for in-vehicle class B * Bus speed 10.4 kbps nominal * Drive capability 32 bus nodes * Low RFI due to output waveshaping with adjustable slew rate * Direct battery operation with protection against +50V load dump, jump start and reverse battery DESCRIPTION The AU5780 is a line transceiver being primarily intended for in-vehicle multiplex applications. It provides interfacing between a link controller and the physical bus wire. The device supports the SAE/J1850 VPWM standard with a nominal bus speed of 10.4 kbps. PIN CONFIGURATION * Bus terminals proof against automotive transients up to -200V/+200V BATT 1 8 GND * Thermal overload protection * Very low bus idle power consumption * Diagnostic loop-back mode * 4X mode (41.6 kbps) reception capability * ESD protected to 9 KV on bus and battery pins * 8-pin SOIC TX 2 AU5780 7 BUS_OUT R/F 3 6 /LB RX 4 SO8 5 BUS_IN SL01196 QUICK REFERENCE DATA SYMBOL VBATT.op TA VBATT.ld IBATT.lp VB VBOH -IBO.LIM VBI tP VSR PARAMETER Operating supply voltage Operating ambient temperature Battery voltage Bus idle supply current Bus voltage Bus output voltage Bus output source current Bus input threshold Propagation delay Bus output slew rate Tx to Rx Rs = 56 k load dump; 1s VBATT=12V 0 < VBATT < 24V 300 < RL < 1.6k 0V < VBO < +8.5V 3.65 16 0.3 -20 7.3 CONDITIONS MIN. 6 -40 TYP. 12 MAX. 24 +125 +50 200 +20 8.0 47 4.1 24 UNIT V C V A V V mA V s V/s ORDERING INFORMATION DESCRIPTION SO8: 8-pin plastic small outline package; Packed in tubes SO8: 8-pin plastic small outline package; Packed on tape & reel TEMPERATURE RANGE -40 to +125C -40 to +125C ORDER CODE AU5780D AU5780D-T DWG # SOT96-1 SOT96-1 1998 Jun 30 2 853-2087 19650 Philips Semiconductors Product specification SAE/J1850/VPW transceiver AU5780 BLOCK DIAGRAM BATTERY (+12V) BATT 1 LOW-POWER TIMER VOLTAGE REFERENCE TEMP. PROTECTION BUS_OUT TX 2 TX- BUFFER OUTPUT BUFFER 7 Rb Rs R/F 3 /LB 6 INPUT BUFFER Rf Vcc Rd 4 RX VOLTAGE REFERENCE INPUT FILTER 5 BUS_IN AU5780 8 GND SL01195 1998 Jun 30 3 Philips Semiconductors Product specification SAE/J1850/VPW transceiver AU5780 PIN DESCRIPTION SYMBOL BATT TX R/F RX BUS_IN /LB BUS_OUT GND PIN 1 2 3 4 5 6 7 8 Battery supply input (12V nom.) Transmit data input; low: transmitter passive; high: transmitter active Rise/fall slew rate set input Receive data output; low: active bus condition detected; float/high: passive bus condition detected Bus line receive input Loop-back test mode control input; low: loop-back mode; high: normal communication mode Bus line transmit output Ground DESCRIPTION FUNCTIONAL DESCRIPTION The AU5780 is an integrated line transceiver IC that interfaces an SAE/J1850 protocol controller IC to the vehicle's multiplexed bus line. It is primarily intended for automotive "Class B" multiplexing applications in passenger cars using VPW (Variable Pulse Width) modulated signals with a nominal bit rate of 10.4 kbps. The AU5780 also receives messages in the so-called 4X mode where data is transmitted with a typical bit rate of 41.6 kbps. The device provides transmit and receive capability as well as protection to a J1850 electronic module. A J1850 link controller feeds the transmit data stream to the transceiver's TX input. The AU5780 transceiver waveshapes the TX data input signal with controlled rise & fall slew rates and rounded shape. The bus output signal is transmitted with both voltage and current control. The BUS_IN input is connected to the physical bus line via an external resistor. The external resistor and an internal capacitance provides filtering against RF bus noise. The incoming signal is output at the RX pin being connected to the J1850 link controller. If the TX input is idle for a certain time, then the AU5780 enters a low-power mode. This mode is dedicated to help meet ignition-off current draw requirements. The BUS_IN input comparator is kept alive in the low-power mode. Normal power mode will be entered again upon detection of activity, i.e., rising edge at the TX input. The device is able to receive and transmit a valid J1850 message when initially in low-power mode. The AU5780 features special robustness at its BATT and BUS_OUT pins hence the device is well suited for applications in the automotive environment. Specifically, the BATT input is protected against 50V load dump, jump start and reverse battery condition. The BUS_OUT output is protected against wiring fault conditions, e.g., short circuit to battery voltage as well as typical automotive transients (i.e., -200V / +200V). In addition, an overtemperature shutdown function with hysteresis is incorporated which protects the device under system fault conditions. The chip temperature is sensed at the bus drive transistor in the output buffer. In case of the chip temperature reaching the trip point, the AU5780 will latch-off the transceiver function. The device is reset on the first rising edge on the TX input after a small decrease of the chip temperature. The AU5780 also provides a loop-back mode for diagnostic purpose. If the /LB pin is open circuit or pulled low, then TX signal is internally looped back to the RX output independent of the signals on the bus. In this mode the electronic module is disconnected from the bus, i.e., the TX signal is not output to the physical bus line. In this mode, it can be used, e.g., for self-test purpose. 1998 Jun 30 4 Philips Semiconductors Product specification SAE/J1850/VPW transceiver AU5780 CONTROL INPUT SUMMARY TX 0 1 0 1 /LB 0 0 1 1 Loop-back Loop-back Communication Communication MODE BIT VALUE TX passive (default state) TX active Transmitter passive Transmitter active BUS_OUT float float float high RX (out) float (high) low bus state1 low NOTE: 1. RX outputs the bus state. If the bus level is below the receiver threshold (i.e., all transmitters passive), then RX will be floating (i.e., high, considering external pull-up resistance). Otherwise, if the bus level is above the receiver threshold (i.e., at least one transmitter is active), then RX will be low. ABSOLUTE MAXIMUM RATINGS According to the IEC 134 Absolute Maximum System; operation is not guaranteed under these conditions; all voltages are referenced to pin 8 (GND); positive currents flow into the IC; unless otherwise specified. SYMBOL VBATT VBATT.ld VBATT.tr1 VBATT.tr2 VBATT.tr3 VB VB.tr1 VB.tr2 VB.tr3 VI ESDBATT ESDbus ESDlogic Ptot JA Tamb Tstg Tvj supply voltage short-term supply voltage transient supply voltage transient supply voltage transient supply voltage Bus voltage transient bus voltage transient bus voltage transient bus voltage DC voltage on pins TX, R/F, RX, /LB ESD capability of BATT pin ESD capability of BUS_OUT and BUS_IN pins ESD capability of TX, RX, R/F, and /LB pins maximum power dissipation thermal impedance operating ambient temperature storage temperature junction temperature Air gap discharge, R=2k, C=150pF Air gap discharge, R=2k, C=150pF Human Body, R=1.5k, C=100pF at Tamb = +125 C in free air -40 -40 -40 load dump; t < 1s SAE J1113 pulse 1 SAE J1113 pulses 2 SAE J1113 pulses 3A, 3B Rf > 10 k ; Rb >10 SAE J1113 pulse 1 SAE J1113 pulses 2 SAE J1113 pulses 3A, 3B -200 -0.3 -9 -9 -2 1 PARAMETER CONDITIONS MIN. -20 MAX. +24 +50 V V V +150 V V V V +100 +200 7 +9 +9 +2 164 152 +125 +150 +150 V V V UNIT -100 -200 -20 -50 +200 +20 kV kV kV mW C/W C C C NOTE: 1. For bus voltages -20V < Vbus < -17V and +17V < Vbus < +20V the current is limited by the external resistors Rb and Rf. 1998 Jun 30 5 Philips Semiconductors Product specification SAE/J1850/VPW transceiver AU5780 CHARACTERISTICS -40C < Tamb < +125C; 6V < VBATT< 16V; V/LB> 3V; 0 < VBUS< +8.5V; RS= 56 kW Rd= 10 kW; Rf = 15 kW; Rb= 10W; 300 W< RL< 1.6 kW; all voltages are referenced to pin 8 (GND); positive currents flow into the IC; unless otherwise specified. SYMBOL IBATT.id IBATT.p IBATT.oc IBATT.sc Tsd Thys PARAMETER supply current; bus idle supply current; passive state supply current; no load supply current; bus short to GND Thermal shutdown Thermal shutdown hysteresis CONDITIONS TX low; Note 1 TX low TX high TX high, VBO = 0V 155 5 15 MIN. TYP. MAX. 200 1.5 8 50 UNIT A mA mA mA C C Pins TX and /LB Vih Vil Vh Iih2 Iih6 Pin RX Vol Iih Irx Pin BUS_OUT Volb Vol Voh BUS_OUT in loop-back mode; TX high or low BUS_OUT voltage; passive BUS_OUT voltage; active /LB low or floating; 0 BUS_OUT voltage; low battery VBATT - 1.7 8 V - IBO.LIM - IBO.LIMn - IBO.LK - IBO.N - IBO.LOG Pin BUS_IN Vih Vil Vh Vilk BUS_OUT source current; bus positive BUS_OUT source current; bus negative BUS_OUT leakage current; TX low; bus positive BUS_OUT leakage current; TX low; bus negative BUS_OUT leakage current with loss of ground 47 55 +10 +100 100 mA mA A A A Input high voltage Input low voltage Input hysteresis Input leakage current -17V < Vbus < +17V 4.1 3.65 100 -5 +5 V V mV A 1998 Jun 30 6 Philips Semiconductors Product specification SAE/J1850/VPW transceiver AU5780 DYNAMIC CHARACTERISTICS -40C < Tamb < +125C; 9V < VBATT< 16V; V/LB > 3V; 0V Isr Bus output current slew rate 0.87 2.1 mA/s VdB_limit NR NI Pin Rs Ksr Pin BUS_IN CBIN tDRXON; TDRXOFF TDRX_ Pin BATT tlow_power Bus emissions voltage output Bus noise rejection from battery Bus noise isolation from battery -60 dBV dB dB Slew rate relationship factor, Note 3 0.7 1 1.3 - Bus Input capacitance Bus line to RX propagation delay Bus line to RX propagation delay mismatch With 8V / 0V square wave input, Rf = 15k tDRXOFF -tDRXON TX low 10 0.4 20 1.7 1 pF s s time-out to low power state 1 4 ms NOTES; 1. TX < 0.9V for more than 4 ms 2. For 6V < VBATT < 9V the bus output voltage is limited by the supply voltage. For 16V < VBATT < 24V (jump start) the load is limited by the package power dissipation ratings; the duration of this condition is recommended to be less than 90 seconds. 3. Vsr = (Ksr * Vsr.nom * Rs.nom) / Rs with Vsr.nom = 0.3 V/s; Rs.nom = 56 k; 45 k < Rs < 70 k 1998 Jun 30 7 Philips Semiconductors Product specification SAE/J1850/VPW transceiver AU5780 APPLICATION INFORMATION J1850 LINKCONTROLLER VPWO VPWI +5V 10k 2) 56k 10NF TX RX /LB AU5780 R/F BATT +12V TRANSCEIVER BUS_IN BUS_OUT GND 15k 10W RL 1) CL SAE/J1850 VPW BUS LINE SL01197 NOTES: 1. Value depends, e.g., on type of bus node. Example: primary node RL=1.6k , secondary node RL=11k. 2. For connection of /LB there are different options, e.g., connect to VCC or to low-active reset or to a port pin. 1998 Jun 30 8 Philips Semiconductors Product specification SAE/J1850/VPW transceiver AU5780 SO8: plastic small outline package; 8 leads; body width 3.9mm SOT96-1 1998 Jun 30 9 Philips Semiconductors Product specification SAE/J1850/VPW transceiver AU5780 Data sheet status Data sheet status Objective specification Preliminary specification Product specification Product status Development Qualification Definition [1] This data sheet contains the design target or goal specifications for product development. Specification may change in any manner without notice. This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips Semiconductors reserves the right to make chages at any time without notice in order to improve design and supply the best possible product. This data sheet contains final specifications. Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. Production [1] Please consult the most recently issued datasheet before initiating or completing a design. Definitions Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Disclaimers Life support -- These products are not designed for use in life support appliances, devices or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088-3409 Telephone 800-234-7381 (c) Copyright Philips Electronics North America Corporation 1998 All rights reserved. Printed in U.S.A. print code Document order number: Date of release: 05-96 9397 750 04079 Philips Semiconductors 1998 Jun 30 10 |
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