5 kV rms Signal Isolated High Speed CAN Transceiver with Bus Protection ADM3054 Data Sheet FEATURES GENERAL DESCRIPTION 5 kV rms signal isolated CAN transceiver 5 V or 3.3 V operation on VDD1 5 V operation on VDD2 VDD2SENSE to detect loss of power on VDD2 Complies with ISO 11898 standard High speed data rates of up to 1 Mbps Short-circuit protection on CANH and CANL against shorts to power/ground in 24 V systems Unpowered nodes do not disturb the bus Connect 110 or more nodes on the bus Thermal shutdown protection High common-mode transient immunity: >25 kV/µs Safety and regulatory approvals UL recognition 5000 V rms for 1 minute per UL 1577 VDE Certificates of Conformity DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12 VIORM = 846 V peak Industrial operating temperature range: −40°C to +125°C Wide-body, 16-lead SOIC package Qualified for automotive applications The ADM3054 is a 5 kV rms signal isolated controller area network (CAN) physical layer transceiver. The ADM3054 complies with the ISO 11898 standard. The device employs Analog Devices, Inc., iCoupler® technology to combine a 3-channel isolator and a CAN transceiver into a single package. The logic side of the device is powered with a single 3.3 V or 5 V supply on VDD1 and the bus side uses a single 5 V supply on VDD2 only. Loss of power on the bus side (VDD2) can be detected by an integrated VDD2SENSE signal. The ADM3054 creates an isolated interface between the CAN protocol controller and the physical layer bus. It is capable of running at data rates of up to 1 Mbps. The device has integrated protection on the bus pins, CANH and CANL against shorts to power/ground in 24 V systems. The device has current-limiting and thermal shutdown features to protect against output short circuits and situations where the bus might be shorted to ground or power terminals. The part is fully specified over the industrial temperature range and is available in a 16-lead, wide-body SOIC package. APPLICATIONS CAN data buses Industrial field networks FUNCTIONAL BLOCK DIAGRAM VDD2 VDD1 ISOLATION BARRIER ADM3054 VDD2 VOLTAGE SENSE CAN TRANSCEIVER VDD2SENSE DECODE ENCODE TxD ENCODE DECODE THERMAL SHUTDOWN D CANH R DECODE CANL ENCODE VOLTAGE REFERENCE DIGITAL ISOLATION iCoupler® VREF LOGIC SIDE BUS SIDE GND1 GND2 10274-001 RxD Figure 1 Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2012–2013 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com ADM3054 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Test Circuits and Switching Characteristics................................ 13 Applications ....................................................................................... 1 Theory of Operation ...................................................................... 15 General Description ......................................................................... 1 CAN Transceiver Operation ..................................................... 15 Functional Block Diagram .............................................................. 1 Thermal Shutdown .................................................................... 15 Revision History ............................................................................... 2 Truth Tables................................................................................. 15 Specifications..................................................................................... 3 Electrical Isolation...................................................................... 16 Timing Specifications .................................................................. 4 Magnetic Field Immunity ......................................................... 17 Regulatory Information ............................................................... 5 Applications Information .............................................................. 18 Insulation and Safety-Related Specifications ............................ 5 Typical Applications ................................................................... 18 VDE 0884 Insulation Characteristics ........................................ 6 Packaging and Ordering Information ......................................... 20 Absolute Maximum Ratings ....................................................... 7 Outline Dimensions ................................................................... 20 ESD Caution .................................................................................. 7 Ordering Guide .......................................................................... 20 Pin Configuration and Function Descriptions ............................. 8 Automotive Products ................................................................. 20 Typical Performance Characteristics ............................................. 9 REVISION HISTORY 9/13—Rev. A to Rev. B Changes to Features Section............................................................ 1 Changes to Ordering Guide .......................................................... 20 Added Automotive Products Section .......................................... 20 10/11—Revision 0: Initial Version 12/12—Rev. 0 to Rev. A Changes to Features Section............................................................ 1 Changed Regulatory Information (Pending) Section to Regulatory Information Section ..................................................... 5 Changes to Table 3 Caption............................................................. 5 Changed VDE 0884 Insulation Characteristics (Pending) Section to VDE 0884 Insulation Characteristics Section ............ 6 Rev. B | Page 2 of 20 Data Sheet ADM3054 SPECIFICATIONS Each voltage is relative to its respective ground, 3.0 V ≤ VDD1 ≤ 5.5 V, TA = −40°C to +125°C, 4.75 V ≤ VDD2 ≤ 5.25 V, unless otherwise noted. Table 1. Parameter SUPPLY CURRENT Power Supply Current Logic Side TxD/RxD Data Rate 1 Mbps Power Supply Current Bus Side Recessive State Dominant State TxD/RxD Data Rate 1 Mbps DRIVER Logic Inputs Input Voltage High Input Voltage Low CMOS Logic Input Currents Differential Outputs Recessive Bus Voltage CANH Output Voltage CANL Output Voltage Differential Output Voltage Short-Circuit Current, CANH Short-Circuit Current, CANL RECEIVER Differential Inputs Differential Input Voltage Recessive Differential Input Voltage Dominant Input Voltage Hysteresis CANH, CANL Input Resistance Differential Input Resistance Logic Outputs Output Voltage Low Output Voltage High Short-Circuit Current VOLTAGE REFERENCE Reference Output Voltage VDD2 VOLTAGE SENSE VDD2SENSE Output Voltage Low VDD2SENSE Output Voltage High Bus Voltage Sense Threshold Voltage COMMON-MODE TRANSIENT IMMUNITY 1 1 Symbol Min IDD1 IDD2 Typ Max Unit 2.5 3.0 mA 10 75 55 mA mA mA RL = 60 Ω, see Figure 28 RL = 60 Ω, see Figure 28 RL = 60 Ω, see Figure 28 0.25 VDD1 500 V V µA TxD TxD TxD 200 V V V V mV mA mA mA VTxD = high, RL = ∞, see Figure 22 VTxD = low, see Figure 22 VTxD = low, see Figure 22 VTxD = low, RL = 45 Ω, see Figure 22 VTxD = high, RL = ∞, see Figure 22 VCANH = −5 V VCANH = −36 V VCANL = 36 V −2 V < VCANL, VCANH < 7 V, see Figure 24, CL = 15 pF −7 V < VCANL, VCANH < 12 V, see Figure 24, CL = 15 pF −2 V < VCANL, VCANH < 7 V, see Figure 24, CL = 15 pF −7 V < VCANL, VCANH < 12 V, see Figure 24, CL = 15 pF See Figure 25 VIH VIL IIH, IIL 0.7 VDD1 VCANL, VCANH VCANH VCANL VOD VOD ISCCANH ISCCANH ISCCANL 2.0 2.75 0.5 1.5 −500 VIDR −1.0 +0.5 V −1.0 +0.4 V 0.9 5.0 V 1.0 5.0 V 25 100 mV kΩ kΩ VIDD −100 VHYS RIN RDIFF 5 20 VOL VOH IOS VDD1 − 0.3 7 VREF 2.025 VOL VOH VTH(SENSE) 3.0 4.5 2.0 3.0 +50 −200 150 VDD1 − 0.3 2.0 25 0.2 VDD1 − 0.2 0.2 VDD1 − 0.2 0.4 Test Conditions/Comments 85 V V mA IOUT = 1.5 mA IOUT = −1.5 mA VOUT = GND1 or VDD1 3.025 V |IREF = 50 µA| 0.4 V V V kV/µs IOSENSE = 1.5 mA IOSENSE = −1.5 mA VDD2 VCM = 1 kV, transient, magnitude = 800 V 2.5 CM is the maximum common-mode voltage slew rate that can be sustained while maintaining specification compliant operation. VCM is the common-mode potential difference between the logic and bus sides. The transient magnitude is the range over which the common mode is slewed. The common-mode voltage slew rates apply to both rising and falling common-mode voltage edges. Rev. B | Page 3 of 20 ADM3054 Data Sheet TIMING SPECIFICATIONS Each voltage is relative to its respective ground, 3.0 V ≤ VDD1 ≤ 5.5 V. TA = −40°C to +125°C, 4.75 V ≤ VDD2 ≤ 5.25 V, unless otherwise noted. Table 2. Parameter DRIVER Maximum Data Rate Propagation Delay TxD On to Bus Active Max Unit tonTxD 90 Mbps ns Propagation Delay TxD Off to Bus Inactive toffTxD 120 ns RECEIVER Propagation Delay TxD On to Receiver Active tonRxD 200 ns toffRxD 250 ns tSE tSD 300 10 µs ms Propagation Delay TxD Off to Receiver Inactive POWER-UP Enable Time, VDD2 High to VDD2SENSE Low Disable Time, VDD2 Low to VDD2SENSE High Symbol Min Typ 1 Rev. B | Page 4 of 20 Test Conditions/Comments RL = 60 Ω, CL = 100 pF, see Figure 23 and Figure 27 RL = 60 Ω, CL = 100 pF, see Figure 23 and Figure 27 RL = 60 Ω, CL = 100 pF, see Figure 23 and Figure 27 RL = 60 Ω, CL = 100 pF, see Figure 23 and Figure 27 See Figure 26 See Figure 26 Data Sheet ADM3054 REGULATORY INFORMATION Table 3. ADM3054 Approvals Organization UL VDE Approval Type Recognized under the component recognition program of Underwriters Laboratories, Inc. Certified according to DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12 Notes In accordance with UL 1577, each ADM3054 is proof tested by applying an insulation test voltage ≥ 6000 V rms for 1 second In accordance with DIN V VDE V 0884-10, each ADM3054 is proof tested by applying an insulation test voltage ≥ 1590 V peak for 1 second (partial discharge detection limit = 5 pC) INSULATION AND SAFETY-RELATED SPECIFICATIONS Table 4. Parameter Rated Dielectric Insulation Voltage Minimum External Air Gap (External Clearance) Symbol L(I01) Value 5000 8.0 Unit V rms mm Minimum External Tracking (Creepage) L(I02) 7.6 mm Minimum Internal Gap (Internal Clearance) Tracking Resistance (Comparative Tracking Index) Isolation Group CTI 0.017 min >175 IIIa mm V Rev. B | Page 5 of 20 Test Conditions/Comments 1-minute duration Measured from input terminals to output terminals, shortest distance through air Measured from input terminals to output terminals, shortest distance along body Insulation distance through insulation DIN IEC 112/VDE 0303-1 Material group (DIN VDE 0110) ADM3054 Data Sheet VDE 0884 INSULATION CHARACTERISTICS This isolator is suitable for reinforced electrical isolation only within the safety limit data. Maintenance of the safety data must be ensured by means of protective circuits. Table 5. Description CLASSIFICATIONS Installation Classification per DIN VDE 0110 for Rated Mains Voltage ≤150 V rms ≤300 V rms ≤400 V rms Climatic Classification Pollution Degree VOLTAGE Maximum Working Insulation Voltage Input-to-Output Test Voltage, Method B1 Input-to-Output Test Voltage, Method A After Environmental Tests, Subgroup 1 After Input and/or Safety Test, Subgroup 2/Subgroup 3: Highest Allowable Overvoltage SAFETY LIMITING VALUES Case Temperature Input Current Output Current Insulation Resistance at TS Test Conditions/Comments Symbol VIORM × 1.6 = VPR, tm = 60 sec, partial discharge < 5 pC VIORM × 1.2 = VPR, tm = 60 sec, partial discharge < 5 pC Rev. B | Page 6 of 20 Unit I to IV I to III I to II 40/125/21 2 DIN VDE 0110 VIORM × 1.875 = VPR, 100% production tested, tm = 1 sec, partial discharge < 5 pC Characteristic VIORM VPR 846 1590 V peak V peak VPR VPR 1357 1018 V peak V peak VTR 6000 V peak TS IS, INPUT IS, OUTPUT RS 150 265 335 >109 °C mA mA Ω Data Sheet ADM3054 ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. Each voltage is relative to its respective ground. Table 6. Parameter VDD1, VDD2 Digital Input Voltage TxD Digital Output Voltage RxD VDD2SENSE CANH, CANL VREF Operating Temperature Range Storage Temperature Range ESD (Human Body Model) Lead Temperature Soldering (10 sec) Vapor Phase (60 sec) Infrared (15 sec) θJA Thermal Impedance TJ Junction Temperature Rating −0.5 V to +6 V −0.5 V to VDD1 + 0.5 V Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ESD CAUTION −0.5 V to VDD1 + 0.5 V −0.5 V to VDD1 + 0.5 V −36 V to +36 V −0.5 V to +6 V −40°C to +125°C −55°C to +150°C ±3.5 kV 300°C 215°C 220°C 53°C/W 150°C Rev. B | Page 7 of 20 ADM3054 Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS NC 1 16 GND2 GND1 2 15 NC GND1 3 14 NC VDD2SENSE ADM3054 13 VDD2 TOP VIEW RxD 5 (Not to Scale) 12 CANH TxD 6 11 CANL VDD1 7 10 VREF GND1 8 9 GND2 NOTES 1. NC = NO CONNECT. 10274-009 4 Figure 2. Pin Configuration Table 7. Pin Function Descriptions Pin No. 1 2 3 4 Mnemonic NC GND1 GND1 VDD2SENSE 5 6 7 RxD TxD VDD1 8 9 10 11 12 13 14 15 16 GND1 GND2 VREF CANL CANH VDD2 NC NC GND2 Description No Connect. This pin remains unconnected. Ground (Logic Side). Ground (Logic Side). VDD2 Voltage Sense. A low level on VDD2SENSE indicates that power is connected on VDD2. A high level on VDD2SENSE indicates a loss of power on VDD2. Receiver Output Data. Driver Input Data. Power Supply (Logic Side); 3.3 V or 5 V. A decoupling capacitor to GND1 is required; a capacitor value between 0.01 µF and 0.1 µF is recommended. Ground (Logic Side). Ground (Bus Side). Reference Voltage Output. Low Level CAN Voltage Input/Output. High Level CAN Voltage Input/Output. Power Supply (Bus Side); 5 V. A decoupling capacitor to GND2 is required; a capacitor value of 0.1 µF is recommended. No Connect. This pin remains unconnected. No Connect. This pin remains unconnected. Ground (Bus Side). Rev. B | Page 8 of 20 Data Sheet ADM3054 TYPICAL PERFORMANCE CHARACTERISTICS 205 160 155 150 145 75 50 25 0 –25 100 125 TEMPERATURE (°C) RECEIVER INPUT VOLTAGE HYSTERESIS, VHYS (V) PROPAGATION DELAY TxD ON TO RECEIVER ACTIVE, tONRxD (ns) 153 152 151 150 149 148 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 SUPPLY VOLTAGE, VDD2 (V) 10274-011 147 4.85 PROPAGATION DELAY TxD OFF TO BUS INACTIVE, tOFFTxD (ns) 220 210 200 190 180 0 25 5.00 5.05 5.10 5.15 5.20 5.25 VDD1 = 3.3V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V 155 154 153 152 151 150 149 148 147 146 –50 –25 0 25 50 75 100 125 90 VDD1 = 3.3V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V –25 4.95 Figure 7. Receiver Input Hysteresis vs. Temperature 230 170 –50 4.90 TEMPERATURE (°C) 50 75 100 125 TEMPERATURE (°C) 10274-012 PROPAGATION DELAY TxD OFF TO RECEIVER INACTIVE, tOFFRxD (ns) 240 4.85 156 Figure 4. Propagation Delay from TxD On to Receiver Active vs. Supply Voltage, VDD2 250 4.80 Figure 6. Propagation Delay from TxD Off to Receiver Inactive vs. Supply Voltage, VDD2 VDD1 = 3.3V, TA = 25°C VDD1 = 5V, TA = 25°C 4.80 185 SUPPLY VOLTAGE, VDD2 (V) 155 146 4.75 190 180 4.75 Figure 3. Propagation Delay from TxD On to Receiver Active vs. Temperature 154 195 VDD1 = 3.3V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V 85 80 75 70 65 60 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) Figure 8. Propagation Delay from TxD Off to Bus Inactive vs. Temperature Figure 5. Propagation Delay from TxD Off to Receiver Inactive vs. Temperature Rev. B | Page 9 of 20 10274-015 140 –50 200 10274-014 165 VDD1 = 3.3V, TA = 25°C VDD1 = 5V, TA = 25°C 10274-013 PROPAGATION DELAY TxD OFF TO RECEIVER INACTIVE, tOFFRxD (ns) VDD1 = 3.3V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V 10274-010 PROPAGATION DELAY TxD ON TO RECEIVER ACTIVE, tONRxD (ns) 170 ADM3054 Data Sheet 78 42 41 SUPPLY CURRENT, IDD2 (mA) 77 76 75 74 73 72 40 39 38 37 36 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 SUPPLY VOLTAGE, VDD2 (V) 34 100 1000 DATA RATE (kbps) 10274-019 71 4.75 VDD1 = 3.3V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V 35 10274-016 PROPAGATION DELAY TxD OFF TO BUS INACTIVE, tOFFTxD (ns) VDD1 = 3.3V, TA = 25°C VDD1 = 5V, TA = 25°C Figure 12. Supply Current (IDD2) vs. Data Rate Figure 9. Propagation Delay from TxD Off to Bus Inactive vs. Supply Voltage, VDD2 1.2 54 52 1.0 SUPPLY CURRENT, IDD1 (mA) PROPAGATION DELAY TxD ON TO BUS ACTIVE, tONTxD (ns) VDD1 = 3.3V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V 50 48 46 44 0.8 0.6 0.4 0.2 42 0 25 50 100 75 125 TEMPERATURE (°C) 10274-017 –25 0 100 Figure 13. Supply Current (IDD1) vs. Data Rate Figure 10. Propagation Delay from TxD On to Bus Active vs. Temperature 50 DIFFERENTIAL OUTPUT VOLTAGE DOMINANT, VOD (V) 48 47 46 45 44 2.30 2.25 2.20 2.15 43 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 SUPPLY VOLTAGE, VDD2 (V) Figure 11. Propagation Delay from TxD On to Bus Active vs. Supply Voltage, VDD2 2.10 –50 –25 0 25 50 TEMPERATURE (°C) 75 100 125 10274-021 42 4.75 VDD1 = 5V, VDD2 = 5V, RL = 45Ω VDD1 = 5V, VDD2 = 5V, RL = 60Ω 10274-018 PROPAGATION DELAY TxD ON TO BUS ACTIVE, tONTxD (ns) 2.35 VDD1 = 3.3V, TA = 25°C VDD1 = 5V, TA = 25°C 49 1000 DATA RATE (kbps) 10274-020 VDD1 = 3.3V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V 40 –50 Figure 14. Driver Differential Output Voltage Dominant vs. Temperature Rev. B | Page 10 of 20 140 2.5 2.4 2.3 2.2 2.1 2.0 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 SUPPLY VOLTAGE, VDD2 (V) 130 120 110 100 90 80 –50 50 75 100 125 2.70 VDD1 = 5V, VDD2 = 5V 2.65 REFERENCE VOLTAGE, VREF (V) 4.88 4.87 4.86 4.85 2.60 2.55 2.50 2.45 2.40 –25 0 25 50 75 100 125 TEMPERATURE (°C) 10274-023 RECEIVER OUTPUT VOLTAGE HIGH, VOH (V) 25 Figure 17. Receiver Output Low Voltage vs. Temperature 4.89 4.84 –50 0 TEMPERATURE (°C) Figure 15. Driver Differential Output Voltage Dominant vs. Supply Voltage, VDD2 4.90 –25 2.35 –50 VDD1 = 5V, VDD2 = 5V, IREF = +50μA VDD1 = 5V, VDD2 = 5V, IREF = –50μA –25 0 25 50 75 TEMPERATURE (°C) Figure 18. VREF vs. Temperature Figure 16. Receiver Output High Voltage vs. Temperature Rev. B | Page 11 of 20 100 125 10274-025 1.9 4.75 VDD1 = 3.3V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V 10274-024 VDD1 = 5V, VDD2 = 5V, RL = 45Ω VDD1 = 5V, VDD2 = 5V, RL = 60Ω RECEIVER OUTPUT VOLTAGE LOW, VOL (mV) 2.6 ADM3054 10274-022 DIFFERENTIAL OUTPUT VOLTAGE DOMINANT, VOD (V) Data Sheet ADM3054 Data Sheet 2.42 146 VDD1 = 5V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V 2.40 VDD2SENSE THRESHOLD VOLTAGE HIGH TO LOW, VTH (SENSE) (V) 142 140 138 136 134 132 2.36 2.34 2.32 2.30 2.28 128 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) 10274-026 130 200 VDD1 = 5V, VDD2 = 5V 198 196 194 192 190 188 186 –25 0 25 50 75 100 125 TEMPERATURE (°C) 10274-027 184 182 –50 2.26 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) Figure 21. VDD2 Voltage Sense Threshold Voltage High to Low vs. Temperature Figure 19. Enable Time, VDD2 High to VDD2SENSE Low vs. Temperature VDD2SENSE DISABLE TIME, tSD (ns) 2.38 Figure 20. Disable Time, VDD2 Low to VDD2SENSE High vs. Temperature Rev. B | Page 12 of 20 10274-028 VDD2SENSE ENABLE TIME, tSE (ns) 144 Data Sheet ADM3054 TEST CIRCUITS AND SWITCHING CHARACTERISTICS RL 2 VCANH RL 2 CANH VOC VCANL VID RxD CL CANL Figure 22. Driver Voltage Measurement Figure 24. Receiver Voltage Measurements CANH TxD RL CL CANL 10274-003 RxD 15pF Figure 23. Switching Characteristics Measurements VRxD HIGH LOW 0.9 0.5 VID (V) 10274-004 VHYS Figure 25. Receiver Input Hysteresis 5V VTH(SENSE) VTH(SENSE) VDD2 10274-002 VOD 10274-006 TxD 0V tSE tSD VDD1 0.4V 0V Figure 26. VDD2SENSE Enable/Disable Time Rev. B | Page 13 of 20 10274-005 VDD1 – 0.3 VDD2SENSE ADM3054 Data Sheet VDD1 0.7VDD1 VTxD 0.25VDD1 0V VOD VDIFF = VCANH – VCANL VDIFF 0.9V 0.5V VOR tOFFTxD tONTxD VDD1 VDD1 – 0.3V VRxD 10274-007 0.4VCC tOFFRxD tONRxD 0V Figure 27. Driver and Receiver Propagation Delay VDD2 1µF VDD1 VDD2 ISOLATION BARRIER ADM3054 VDD2 VOLTAGE SENSE CAN TRANSCEIVER VDD2SENSE DECODE ENCODE TxD ENCODE DECODE THERMAL SHUTDOWN D CANH RL R CANL ENCODE DECODE VOLTAGE REFERENCE DIGITAL ISOLATION iCoupler® VREF LOGIC SIDE BUS SIDE GND2 GND1 Figure 28. Supply Current Measurement Test Circuit Rev. B | Page 14 of 20 10274-008 RxD Data Sheet ADM3054 THEORY OF OPERATION CAN TRANSCEIVER OPERATION TRUTH TABLES A CAN bus has two states: dominant and recessive. A dominant state is present on the bus when the differential voltage between CANH and CANL is greater than 0.9 V. A recessive state is present on the bus when the differential voltage between CANH and CANL is less than 0.5 V. During a dominant bus state, the CANH pin is high and the CANL pin is low. During a recessive bus state, both the CANH and CANL pins are in the high impedance state. The truth tables in this section use the abbreviations listed in Table 8. The driver drives CANH high and CANL low (dominant state) when a logic low is present on TxD. If a logic high is present on TxD, the driver outputs are placed in a high impedance state (recessive state). The driver output states are presented in Table 9. The receiver output is low when the bus is in the dominant state and high when the bus is in the recessive state. If the differential voltage between CANH and CANL is between 0.5 V and 0.9 V, the bus state is indeterminate and the receiver output can be either high or low. The receiver output states for given inputs are listed in Table 10. THERMAL SHUTDOWN The ADM3054 contains thermal shutdown circuitry that protects the part from excessive power dissipation during fault conditions. Shorting the driver outputs to a low impedance source can result in high driver currents. The thermal sensing circuitry detects the increase in die temperature under this condition and disables the driver outputs. This circuitry is designed to disable the driver outputs when a junction temperature of 150°C is reached. As the device cools, the drivers reenable at a temperature of 140°C. Table 8. Truth Table Abbreviations Letter H L I X Z NC Description High level Low level Indeterminate Don’t care High impedance (off ) Disconnected Table 9. Transmitting Supply Status VDD1 VDD2 On On On On On On Off On On Off Input TxD L H Floating X L State Dominant Recessive Recessive Recessive I Outputs CANH CANL H L Z Z Z Z Z Z I I VDD2SENSE L L L I H Table 10. Receiving Supply Status VDD1 VDD2 On On On On On On On On Off On On Off Rev. B | Page 15 of 20 Inputs VID = CANH − CANL ≥0.9 V ≤0.5 V 0.5 V < VID < 0.9 V Inputs open X X Bus State Dominant Recessive I Recessive X X Outputs RxD VDD2SENSE L L H L I L H L I I H H ADM3054 Data Sheet ELECTRICAL ISOLATION iCoupler Technology In the ADM3054, electrical isolation is implemented on the logic side of the interface. Therefore, the device has two main sections: a digital isolation section and a transceiver section (see Figure 29). The driver input signal, which is applied to the TxD pin and referenced to the logic ground (GND1), is coupled across an isolation barrier to appear at the transceiver section referenced to the isolated ground (GND2). Similarly, the receiver input, which is referenced to the isolated ground in the transceiver section, is coupled across the isolation barrier to appear at the RxD pin referenced to the logic ground. The digital signals transmit across the isolation barrier using iCoupler technology. This technique uses chip scale transformer windings to couple the digital signals magnetically from one side of the barrier to the other. Digital inputs are encoded into waveforms that are capable of exciting the primary transformer winding. At the secondary winding, the induced waveforms are decoded into the binary value that was originally transmitted. Positive and negative logic transitions at the input cause narrow (~1 ns) pulses to be sent to the decoder via the transformer. The decoder is bistable and is, therefore, set or reset by the pulses, indicating input logic transitions. In the absence of logic transitions at the input for more than ~1 μs, a periodic set of refresh pulses, indicative of the correct input state, are sent to ensure dc correctness at the output. If the decoder receives no internal pulses for more than about 5 μs, the input side is assumed to be unpowered or nonfunctional, in which case the output is forced to a default state (see Table 9). VDD2 VDD1 ISOLATION BARRIER ADM3054 VDD2 VOLTAGE SENSE CAN TRANSCEIVER VDD2SENSE DECODE ENCODE TxD ENCODE DECODE RxD DECODE ENCODE THERMAL SHUTDOWN D CANH R CANL VOLTAGE REFERENCE DIGITAL ISOLATION iCoupler® VREF BUS SIDE GND1 GND2 Figure 29. Digital Isolation and Transceiver Sections Rev. B | Page 16 of 20 10274-029 LOGIC SIDE Data Sheet ADM3054 MAGNETIC FIELD IMMUNITY The limitation on the magnetic field immunity of the iCoupler is set by the condition in which an induced voltage in the receiving coil of the transformer is large enough to either falsely set or reset the decoder. The following analysis defines the conditions under which this may occur. The 3 V operating condition of the ADM3054 is examined because it represents the most susceptible mode of operation. The pulses at the transformer output have an amplitude greater than 1 V. The decoder has a sensing threshold of about 0.5 V, thus establishing a 0.5 V margin in which induced voltages can be tolerated. The voltage induced across the receiving coil is given by − dβ 2 V = ∑ πrn ; n = 1, 2, …, N dt For example, at a magnetic field frequency of 1 MHz, the maximum allowable magnetic field of 0.2 kgauss induces a voltage of 0.25 V at the receiving coil. This is approximately 50% of the sensing threshold and does not cause a faulty output transition. Similarly, if such an event occurs during a transmitted pulse and is the worst-case polarity, it reduces the received pulse from >1.0 V to 0.75 V, still well above the 0.5 V sensing threshold of the decoder. Figure 31 shows the magnetic flux density values in terms of more familiar quantities, such as maximum allowable current flow at given distances away from the ADM3054 transformers. 1000 100 10 1 DISTANCE = 5mm 10 DISTANCE = 100mm 1 0.1 0.01 1k 0.1 10k 100k 1M 10M MAGNETIC FIELD FREQUENCY (Hz) 100M Figure 31. Maximum Allowable Current for Various Current-to-ADM3054 Spacings 10k 100k 1M 10M MAGNETIC FIELD FREQUENCY (Hz) 100M Figure 30. Maximum Allowable External Magnetic Flux Density 10274-030 0.01 0.001 1k DISTANCE = 1m 100 10274-031 MAXIMUM ALLOWABLE CURRENT (kA) where: β is the magnetic flux density (gauss). N is the number of turns in the receiving coil. rn is the radius of the nth turn in the receiving coil (cm). MAXIMUM ALLOWABLE MAGNETIC FLUX DENSITY (kGAUSS) Given the geometry of the receiving coil and an imposed requirement that the induced voltage is, at most, 50% of the 0.5 V margin at the decoder, a maximum allowable magnetic field can be determined using Figure 30. With combinations of strong magnetic field and high frequency, any loops formed by printed circuit board (PCB) traces can induce error voltages large enough to trigger the thresholds of succeeding circuitry. Therefore, care is necessary in the layout of such traces to avoid this possibility. Rev. B | Page 17 of 20 ADM3054 Data Sheet APPLICATIONS INFORMATION TYPICAL APPLICATIONS 5V ISOLATED SUPPLY 3.3 OR 5V SUPPLY CT 100nF 100nF 3.3 OR 5V SUPPLY RT/2 RT/2 VDD2 VDD1 100nF ISOLATION BARRIER ADM3054 VDD2 VOLTAGE SENSE CAN TRANSCEIVER VDD2SENSE CAN CONTROLLER DECODE ENCODE ENCODE DECODE THERMAL SHUTDOWN TxD D BUS CONNECTOR CANH R RxD VOLTAGE REFERENCE DIGITAL ISOLATION iCoupler® VREF BUS SIDE GND2 GND1 NOTES 1. RT iS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE USED. Figure 32. Typical Isolated CAN Node Using the ADM3054 Rev. B | Page 18 of 20 RT/2 RT/2 CT 10274-032 LOGIC SIDE CANL ENCODE DECODE Data Sheet ADM3054 RT/2 RT/2 CT CT RT/2 RT/2 CANL CANH CANL R VDD2 SENSE GALVANIC ISOLATION TxD RxD VDD2SENSE CANL ADM3054 ADM3054 ADM3054 D CANH R D VDD2 SENSE GALVANIC ISOLATION TxD RxD VDD2SENSE NOTES 1. MAXIMUM NUMBER OF NODES: 110. 2. RT IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE USED. Figure 33. Typical CAN Bus Using the ADM3054 Rev. B | Page 19 of 20 R D VDD2 SENSE GALVANIC ISOLATION TxD RxD VDD2SENSE 10274-033 CANH ADM3054 Data Sheet PACKAGING AND ORDERING INFORMATION OUTLINE DIMENSIONS 10.50 (0.4134) 10.10 (0.3976) 9 16 7.60 (0.2992) 7.40 (0.2913) 1 10.65 (0.4193) 10.00 (0.3937) 8 1.27 (0.0500) BSC 0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 0.75 (0.0295) 45° 0.25 (0.0098) 2.65 (0.1043) 2.35 (0.0925) SEATING PLANE 0.51 (0.0201) 0.31 (0.0122) 8° 0° 0.33 (0.0130) 0.20 (0.0079) 1.27 (0.0500) 0.40 (0.0157) 03-27-2007-B COMPLIANT TO JEDEC STANDARDS MS-013-AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 34. 16-Lead Standard Small Outline Package [SOIC_W] Wide Body (RW-16) Dimensions shown in millimeters and (inches) ORDERING GUIDE Model 1, 2, 3 ADM3054BRWZ ADM3054BRWZ-RL7 ADM3054WBRWZ-RL7 EVAL-ADM3054EBZ Temperature Range −40°C to +125°C −40°C to +125°C −40°C to +125°C Package Description 16-Lead Standard Small Outline Package [SOIC_W] 16-Lead Standard Small Outline Package [SOIC_W] 16-Lead Standard Small Outline Package [SOIC_W] Evaluation Board Package Option 4 RW-16 RW-16 RW-16 Z = RoHS Compliant Part. W = Qualified for Automotive Applications. 3 UL and VDE certifications are pending for the ADM3054WBRWZ-RL7 model. 4 The ADM3054WBRWZ-RL7 package option is halide free. 1 2 AUTOMOTIVE PRODUCTS The ADM3054W models are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. Note that these automotive models may have specifications that differ from the commercial models; therefore, designers should review the Specifications section of this data sheet carefully. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for these models. ©2012–2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D10274-0-9/13(B) www.analog.com/ADM3054 Rev. B | Page 20 of 20