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| L9669 FAULT TOLERANT CAN TRANSCEIVER s s s s s s s s s FAULT TOLERANT DIFFERENTIAL CAN TRANSCEIVER OPERATING SUPPLY VOLTAGE 6V TO 28V, TRANSIENTS UP TO 40V LOW QUIESCENT CURRENT IN STANDBY MODE (100A) AND SLEEP MODE (37A) ON CHIP DIAGNOSIS FOR ERRORS ON THE PHYSICAL BUSLINES WITH MICRO CONTROLLER INTERFACE OPTIMIZED EMI BEHAVIOUR DUE TO LIMITED AND SYMMETRIC SLOPES OF CAN SIGNALS AUTOMATIC SWITCHING TO SINGLE WIRE MODE UPON BUS FAILURES TWO-EDGE SENSITIVE WAKE-UP PIN SUPPORTS TRANSMISSION WITH GROUND SHIFT VOLTAGES: SINGLE WIRE: 1.5V DIFFERENTIAL WIRE: 3v AN UNPOWERED NODE OR UNSUFFICIENT SO14 ORDERING NUMBER: L9669 SUPPLIES DO NOT DISTURB THE BUS LINES DESCRIPTION The L9669 is an integrated circuit which contains a CAN physical line interface. It integrates all main local functions for automotive body electronic applications connected to a CAN bus. Figure 1. Block Diagram KL30 (+12V) Voltage +5V Regulator VS 14 INH 1 VCC 10 5Vint 75k WAKE 7 VCC 12.5k Wake-up Control CANH Driver TXD Control CANH Driver Filter 11 CANH 12 CANL CAN BUSLINE TXD 2 R RTH 3 R RTL Receiver RXD CANH Termination NSTB EN 5 6 Low Power Control 100k 8 RTH 9 RTL 4 Error Management & Diagnosis CANL Termination NERR 100k 13 GND 99AT0001 July 2003 1/13 L9669 Figure 2. Pin Connection top view. INH TXD RXD NERR NSTB EN WAKE 99AT0002 1 2 3 4 5 6 7 14 13 12 11 10 9 8 VS GND CANL CANH VCC RTL RTH Table 1. Pin Functions N 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin INH TXD RXD NERR NSTB EN WAKE RTH RTL VCC CANH CANL GND VS Function Inhibit Output - for switching external 5V Regulator Transmit Data Input - active LOW dominant Bit transmission Receive Data Output - active LOW dominant Bit reception Error/Diagnostic Output - active LOW error/Wake-up and Diagnostic output Not Standby Input - Digital control signal for low power modes Enable Input/Diagnostic Clock Digital control signal for low power modes/Diagnostic clock Wake-Up Input - If level of VWAKE changes the device initiates a wake-up from sleep mode by switching INH to VS Termination Resistor for CANH - controlled by internal error management Termination Resistor for CANL - controlled by internal error management Supply Voltage Input - +5V High Voltage Bus Line - High: dominant state Low Voltage Bus Line - Low: dominant state Ground Battery Voltage Input - +12V Table 2. Thermal Data Symbol Rthj-amb Parameter Thermal resistance junction to ambient Value 120 Unit C/W 2/13 L9669 Table 3. Absolute Maximum Ratings For externally applied voltages or currents exceeding these limits damage of the circuit may occur! Symbol VS-DC VS-P VCC VCANH,L-DC VX VWAKE TSTG Tj Parameter DC operating battery voltage Pulse operating battery voltage (t<400ms) Supply voltage DC voltage CANH, CANL Voltage TXD, RXD, NERR, NSTB, EN Voltage WAKE Storage temperature Operating junction temperature Value -0.3 to +28 -0.3 to +40 -0.3 to +6 -28 to +40 -0.3 to VCC+0.3 -0.3 to VS+0.3 -55 to +150 -40 to +150 Unit V V V V V V oC oC Notes: 1. All pins of the IC are protected against ESD. The verification is performed according to MIL 883C, human body model with R = 1.5k, C = 100pF and discharge voltage 2kV, corresponding to a maximum discharge energy of 0.2mJ. 2. Voltage forced means voltage limited to specified values while current is not limited. Current forced means voltage unlimited but current limited to specified value. Table 4. Electrical Characteristcs VCC = 4.75V to 5.25V, VS = 6V to 28V, Tj = -40C to 150C unless otherwise specified. Item 1 1.1 Symbol Supplies ISSL Supply current in sleep mode (ISSL = IVS) Supply current in standby mode (ISSB = IVS + IVCC) Supply current in normal mode (ISND = IVS + IVCC) VCC = 0V, VS = 14V 37 65 A A Parameter Test Condition Min. Typ. Max. Unit 1.2 ISSB IINH = 0 110 160 1.3 ISND VS = 14V, VTXD = 0 (dominant state) no load at CAN 27 mA 2 2.1 CAN Line Interface Vr-d Differential receiver recessive to dominant threshold VCANH - VCANL Differential receiver dominant to recessive threshold VCANH - VCANL CANH recessive output voltage No bus errors. VCC = 5V -3.50 -2.20 V 2.2 Vd-r No bus errors. VCC = 5V -3.85 -2.5 V 2.3 VCANHr VTXD = VCC RRTH < 4k VTXD = 0V ICANH = -40mA VTXD = VCC RRTH < 4k VCC 1.4 VCC 0.2 0.35 V 2.4 VCANHd CANH dominant output voltage V 2.5 VCANLr CANL recessive output voltage V 3/13 L9669 Table 4. Electrical Characteristcs (continued) VCC = 4.75V to 5.25V, VS = 6V to 28V, Tj = -40C to 150C unless otherwise specified. Item 2.6 Symbol VCANLd Parameter CANL dominant output voltage Test Condition VTXD = 0V ICANL = 40mA VCANH = 0V VTXD = 0V VCANL = 5V VTXD = 0V VCANH = 14V Sleep mode. VCANL = 0V Sleep mode. Sleep/standby mode. Sleep/standby mode. Normal mode. VCC = 5V Normal mode. VCC = 5V Normal mode. VCC = 5V Normal mode. VCC = 5V 10% to 90% C1 = C2 = 3.3nF R1 = 100 10% to 90% C1 = C2 = 3.3nF R1 = 100 10% to 90% C1 = C2 = 3.3nF R1 = 100 10% to 90% C1 = C2 = 3.3nF R1 = 100 Sleep/standby mode. 8 0.6 1.2 2.4 1.5 -160 -110 Min. Typ. Max. 1.4 Unit V 2.7 ICANH CANH output current -70 mA 2.8 ICANL CANL output current 70 110 160 mA 2.9 ICANHl CANH leakage current 0 A A 2.10 ICANLl CANL leakage current 0 2.11 2.12 2.13 VCANHWK CANH wake-up voltage VCANLWK CANL wake-up voltage VCANHs CANH single ended receiver threshold CANL single ended receiver threshold 1.9 3.1 1.8 2.7 3.8 2.15 V V V 2.14 VCANLs 2.7 3.1 3.4 V 2.15 VCANHOV CANH overvoltage detection threshold VCANLOV CANL overvoltage detection threshold tdrd Propagation delay TXD to RXD recessive to dominant Propagation delay TXD to RXD recessive to dominant CANH, CANL output rise/fall time dominant to recessive CANH, CANL output rise/fall time dominant to recessive Minimum dominant time for wake-up on CANH or CANL Minimum pulse time for wake-up on WAKE 7.2 V 2.16 7.2 V s 2.17 1 1.6 2.18 tddr 2.2 s 2.19 tr,f 1.5 s 2.20 tr,f 2.6 6 s 2.21 twuCAN 44 s s 2.22 twuWK Sleep/standby mode 4 44 4/13 L9669 Table 4. Electrical Characteristcs (continued) VCC = 4.75V to 5.25V, VS = 6V to 28V, Tj = -40C to 150C unless otherwise specified. Item 3 3.1 Symbol Parameter Test Condition Min. Typ. Max. Unit Termination RTH, RTL RRTH Internal RTHto GND switch-on resistance Normal mode. No errors. VRTH = 1V Normal mode. Error 3. VRTH = 1V Normal mode. No errors. VRTL = VCC - 1V Normal mode. Error 4, 6 or 7. VRTL = VCC - 1.5V Sleep/standby mode. VRTL = 1V, 5V Sleep/standby mode IRTH = 1mA 0.5 8 45 3.2 IRTH Internal RTHto GND pull down current 75 A 3.3 RRTL Internal RTLto VCC switch-on resistance 45 3.4 IRTL Internal RTLto VCC pull up current -75 A 3.5 RRTL-VS Internal RTLto VS termination resistance RTH output voltage 13 26 k 3.6 VRTH 1 V 3.7 RRTH, RTL External termination resistance 16 k 4 4.1 Input TXD VTXDh TXD high level input voltage VCC0.9 0 VTXD = 4 V VTXD = 1 V -200 -800 VCC V 4.2 4.3 4.4 5 5.1 VTXDl ITXDh ITXDl TXD low level input voltage TXD high level input current TXD low level input current 0.9 -25 -100 V A A Outputs RXD, NERR VXh High level output voltage VCC 0.9 0 VCC V 5.2 6 6.1 VXl Low level output voltage 0.9 V Output INH VdropI High level voltage drop (VdropI = VS - VINH) Leakage current IINH = -0.18mA Not sleep mode. VINH = 0V Sleep mode. -5 1 V 6.2 IIl 5 A 5/13 L9669 Table 4. Electrical Characteristcs (continued) VCC = 4.75V to 5.25V, VS = 6V to 28V, Tj = -40C to 150C unless otherwise specified. Item 7 7.1 Symbol Inputs NSTB, EN VXh High level input voltage VCC 0.9 0 VX = 4 V VX = 1 V 10 2 VCC V Parameter Test Condition Min. Typ. Max. Unit 7.2 7.3 7.4 8 8.1 8.2 9 9.1 10 10.1 10.2 10.3 10.4 10.5 10.6 10.7 10.8 10.9 10.10 VXl IXh IXl Low level input voltage High level input current Low level input current 0.9 150 40 V A A Input WAKE VWAKEh VWAKEl WAKE high level input voltage WAKE low level input voltage 3 0 VS 0.9 V V Thermal shutdown Tjsd Shutdown junction temperature 170 C CAN Error detection tfail38d Error 3, 8 detection time Normal/RXonly mode. Normal/RXonly mode. Normal/RXonly mode. Normal/RXonly mode. Normal/RXonly mode. Normal/RXonly mode. Sleep/standby mode. Sleep/standby mode. Sleep/standby mode. Normal/RXonly mode. Error 1, 2, 5 or 9. Normal/RXonly mode. Error 1, 2, 5 or 9. 15 1.6 0.4 0.4 10 0.2 0.7 1.6 0.4 0.4 3 3.6 1.6 1.6 50 0.75 4 3.6 1.6 1.6 ms ms ms s ms s ms ms ms Edges tfail46710d Error 4, 6, 7, 10 detection time tfail38r tfail47r tfail6r tfail10r tfail38ds tfail4rs tfail348rs Nedge-d Error 3, 8 recovery time Error 4, 7 recovery time Error 6 recovery time Error 10 recovery time Error 3, 8 detection time Error 4 recovery time Error 3, 4, 8 recovery time Edge count difference between CANH and CANL for detection Edge count difference between CANH and CANL for recovery Diagnostic timeout minimum hold time go to sleep 10.11 Nedge-r 3 Edges s s 10.12 10.13 tDmax tHmin 80 80 6/13 L9669 1. FUNCTIONAL DESCRIPTION The L9669 is a monolithic integrated circuit which provides all main functions for an automotive body CAN system. The device guarantees a clearly defined behavior in case of failure to avoid permanent CAN bus errors. It is primarily intended for low speed applications in passenger cars. 1.1 Transceiver - Supports double wire unshielded busses - Baud rates up to 125 kBaud - Single wire operation possible (automatic switching to single wire upon bus failures) - Bus not loaded in case of unpowered transceiver The CAN transceiver stage is able to transfer serial data on two independent communication wires either differentially (normal operation) or in case of a single wire fault on the remaining line. The physical bitcoding is done using dominant (transmitter active) and overwritable recessive states. Too long dominant phases are detected internally and further transmission is automatically disabled (malfunction of protocol unit does not affect communication on the bus ("fail safe mechanism")). 1.2 Modes of Operation Five different functional modes exist to enable or establish the usage of low power or receive only operation. NSTB 0 0 0 1 EN 0 0 1 1 Mode standby sleep floating "go to sleep" normal RXonly VS 1 0 Power on active LOW error flag active LOW VS power-on flag if VCC is present HIGH=recessive LOW=dominant received data active LOW wake-up interrupt signal if VCC is present switched to VCC INH VS active LOW wake-up interrupt signal (if VCC is present) switched to VS (typ. 13k) NERR RXD RTL switched to VS Note: Wake-up interrupts are released when entering RXonly or normal mode. The following state diagram shows these modes and the possible state interactions depending on the input signals NSTB and EN. 7/13 L9669 Figure 3. Standby Mode NSTB = 1 EN = 0 NSTB = 0 EN = 0 NSTB = 0 EN = 1 Power on Mode RX only Mode NSTB 0 EN 0 INH VS NSTB = 0 EN = 0 NSTB = 1 EN = 0 NSTB = 1 EN = 1 NSTB 1 EN 0 INH VS NSTB = 0 EN = 1 "Go to Sleep" Mode NSTB 0 NSTB = 0 EN = 0 EN 1 INH Float. NSTB = 0 EN = 1 Normal Mode NSTB 1 EN 1 INH VS Wake-up Sleep Mode NSTB 99AT0003 EN 0 INH Float. 0 8/13 L9669 1.3 Error Management Ten different errors on the physical buslines can be distinguished: N Type of Errors Severity RX TX Errors caused by damage of the datalines or isolation 1 2 3 4 5 6 7 CANH wire interrupted (floating or tied to termination) CANL wire interrupted (floating or tied to termination) CANH short circuit to VS (overvoltage condition) CANL short circuit to GND (permanently dominant) CANH short circuit to GND (permanently recessive) CANL short circuit to VS (overvoltage condition) CANL shorted to CANH 0 0 1 2 0 1 2 0 0 1 0 2 1 2 Errors caused by misbehaviour of transceiver stage 8 9 CANH short circuit to VCC (permanently dominant) CANL short circuit to VCC (permanently recessive) 2 0 0 2 Errors caused by defective protocol unit 10 CANH, CANL driven dominant for more than 1.3 ms 2 2 Not all of these errors leads to a breakdown of the whole communication. So the errors can be categorized into "negligible" (severity 0), "problematic" (severity 1) and "severe" (severity 2). Negligible Errors Transmitter Error 1, 2, 4 or 8: In all cases data still can be transmitted in differential mode. Receiver Error 1, 2, 5 or 9: In all cases data still can be received in differential mode. Problematic Errors Transmitter Error 3 or 6: Data are transmitted using the remaining dataline (single wire). Receiver Error 3 or 6: Data are received using the remaining dataline (single wire). Severe Errors Transmitter Error 5 or 9: Error 7: Error 10: Receiver Error 7: Error 4 or 8: Error 10: Data are transmitted using the remaining dataline after short circuit detection. Data are transmitted on CANH or CANL after overcurrent was detected. Transmission is terminated (fail safe). Data are received on CANH or CANL after detection of permanent dominant state. Data are received on CANH or CANL after short circuit was detected. Data are received normally, error is detected by protocol unit. Upon any error in normal or RXonly mode the NERR output will be forced LOW and released after error recovery. 9/13 L9669 1.4 Diagnosis A serial interface is available to retrieve diagnostic informations. Diagnostic data can be requested by using EN as serial clock and evaluating NERR. Figure 4. NSTB EN Bus Error detected NERR E1 E2 or E5 or E9 E3 E4 t Dmax No Bus Errors Mode (Example) Normal Diagnosis RXonly Standby Delay between falling slope at EN and reaction at NERR: 0.7 (NERR is synchronized with internal clock). 99AT0004 s...3.0 s Readout is initialized by a negative edge on EN and acknowledged by NERR entering HIGH state. Following the next negative edge the first error status bit is displayed on NERR according to the data table below. If no edge on EN is detected for a time longer than tDmax diagnosis is disabled and operation continuous in the mode given by NSTB and EN with NERR showing bus errors or wake-up correspondingly. If the clock continues, the readout sequence starts over again with the initial bit set HIGH. The following errors are displayable (sequence listed in chronological order): - error status bit 1 (LSB): - error status bit 2: - error status bit 3: - error status bit 4: - error status bit 5: - error status bit 6: - error status bit 7: - error status bit 8: HIGH if Error 1 or 5 HIGH if Error 2 or 9 HIGH if Error 3 HIGH if Error 4 HIGH if Error 6 HIGH if Error 8 HIGH if Error 10 HIGH if Thermal shutdown of Transceiver 1.5 Protections A current limiting circuit protects the transmitter outputs against short-circuit to battery, ground and shorted wires. If the junction temperature exceeds a maximum value, the transmitter output stages are disabled. 10/13 L9669 2. APPLICATION CIRCUIT DIAGRAM Figure 5. KL30 (+12V) CAN BUS LINE 7 WAKE RTH 8 14 VS R RTH 1 CANH 11 INH Voltage Regulator CAN Transceiver 10 VCC +5V CANL 12 R RTL 2 RTL 9 3 4 5 13 GND 99AT0005 TXD RXD NERR NSTB EN CAN Controller 6 3. TEST CIRCUIT FOR DYNAMIC CHARACTERISTICS Figure 6. +5V +14V INH 1 NSTB 5 VS 14 VCC 10 9 RTL R1 C1 EN 6 12 CANL WAKE 7 CANH C2 TXD 2 11 NERR 4 3 RXD 20pF 13 GND 8 RTH R1 C1 99AT0006 11/13 L9669 mm MIN.. A a1 a2 b b1 C c1 D (1) E e e3 F (1) G L M S 3.8 4.6 0.4 8.55 5.8 1.27 7.62 4 5.3 1.27 0.68 8 (max.) 0.150 0.181 0.016 0.35 0.19 0.5 45 (typ.) 8.75 6.2 0.336 0.228 0.050 0.300 0.157 0.209 0.050 0.027 0.344 0.244 0.1 TYP. MAX.. 1.75 0.25 1.6 0.46 0.25 0.014 0.007 0.020 0.004 MIN.. inch TYP.. MAX.. 0.069 0.009 0.063 0.018 0.010 DIM. OUTLINE AND MECHANICAL DATA SO14 (1) D and F do not include mold flash or protrusions. Mold flash or potrusions shall not exceed 0.15mm (.006inch). 12/13 L9669 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 2003 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. http://www.st.com (R) 13/13 |
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