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AU5780 Dataheets PDF



Part Number AU5780
Manufacturers NXP
Logo NXP
Description SAE/J1850/VPW transceiver
Datasheet AU5780 DatasheetAU5780 Datasheet (PDF)

INTEGRATED CIRCUITS AU5780A SAE/J1850/VPW transceiver Product data Supersedes data of 1999 Jan 28 2001 Jun 19 Philips Semiconductors Philips Semiconductors Product data SAE/J1850/VPW transceiver AU5780A 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 reve.

  AU5780   AU5780


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INTEGRATED CIRCUITS AU5780A SAE/J1850/VPW transceiver Product data Supersedes data of 1999 Jan 28 2001 Jun 19 Philips Semiconductors Philips Semiconductors Product data SAE/J1850/VPW transceiver AU5780A 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 AU5780A 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 AU5780A 7 BUS_OUT R/F 3 6 /LB RX 4 SO8 5 BUS_IN SL01207 QUICK REFERENCE DATA SYMBOL VBATT.op TA VBATT.ld IBATT.lp VB VBOH –IBO.LIM VBI tbo tr, tf 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 Delay TX to BUS_OUT, normal battery BUS_OUT transition times, rise and fall, normal battery Measured at 3.875V Measured between 1.5 V and (VBATT – 2.75 V), 9 < VBATT < 16 V, tr tested at an additional bus load of RLOAD = 400 W and CLOAD = 22000 pF load dump; 1s VBATT=12V 0 < VBATT < 24V 300Ω < RL < 1.6kΩ 0V < VBO < +6.0V –20 7.3 27 3.65 13 11 CONDITIONS MIN. 6 –40 TYP. 12 MAX. 24 +125 +50 220 +20 8.0 50 4.1 21 18 UNIT V °C V µA V V mA V µs µs ORDERING INFORMATION DESCRIPTION SO8: 8-pin plastic small outline package TEMPERATURE RANGE –40 to +125°C ORDER CODE AU5780AD DWG # SOT96-1 2001 Jun 19 2 853-2261 26558 Philips Semiconductors Product data SAE/J1850/VPW transceiver AU5780A 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 SL01208 2001 Jun 19 3 Philips Semiconductors Product data SAE/J1850/VPW transceiver AU5780A 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 AU5780A 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 AU5780A 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 AU5780A 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 AU5780A 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 AU5780A 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 .


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