ADM3054

Data Sheet FEATURES 5 kV rms Signal Isolated High Speed CAN Transceiver with Bus Protection ADM3054 GENERAL DESCRIPTION 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. 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 (pending) 5000 V rms for 1 minute per UL 1577 VDE Certificates of Conformity (pending) 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 APPLICATIONS CAN data buses Industrial field networks FUNCTIONAL BLOCK DIAGRAM VDD1 ISOLATION BARRIER VDD2 VOLTAGE SENSE CAN TRANSCEIVER VDD2SENSE DECODE ENCODE THERMAL SHUTDOWN VDD2 ADM3054 TxD ENCODE DECODE D R RxD DECODE DIGITAL ISOLATION iCoupler® LOGIC SIDE BUS SIDE ENCODE VOLTAGE REFERENCE CANH CANL VREF GND1 GND2 Figure 1 Rev. 0 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. www.analog.com Tel: 781.329.4700 Fax: 781.461.3113 ©2011 Analog Devices, Inc. All rights reserved. 10274-001 ADM3054 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Timing Specifications .................................................................. 4 Regulatory Information ............................................................... 5 Insulation and Safety-Related Specifications ............................ 5 VDE 0884 Insulation Characteristics (Pending) ...................... 6 Absolute Maximum Ratings ....................................................... 7 ESD Caution .................................................................................. 7 Pin Configuration and Function Descriptions ............................. 8 Data Sheet Typical Performance Characteristics ..............................................9 Test Circuits and Switching Characteristics................................ 13 Theory of Operation ...................................................................... 15 CAN Transceiver Operation ..................................................... 15 Thermal Shutdown .................................................................... 15 Truth Tables................................................................................. 15 Electrical Isolation...................................................................... 16 Magnetic Field Immunity ......................................................... 17 Applications Information .............................................................. 18 Typical Applications ................................................................... 18 Packaging and Ordering Information ......................................... 20 Outline Dimensions ................................................................... 20 Ordering Guide .......................................................................... 20 REVISION HISTORY 10/11—Revision 0: Initial Version Rev. 0 | Page 2 of 20 Data Sheet SPECIFICATIONS ADM3054 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 Symbol Min Typ Max Unit Test Conditions/Comments IDD1 IDD2 2.5 3.0 10 75 55 mA mA mA mA RL = 60 Ω, see Figure 28 RL = 60 Ω, see Figure 28 RL = 60 Ω, see Figure 28 VIH VIL IIH, IIL VCANL, VCANH VCANH VCANL VOD VOD ISCCANH ISCCANH ISCCANL 0.7 VDD1 0.25 VDD1 500 2.0 2.75 0.5 1.5 −500 −100 200 3.0 4.5 2.0 3.0 +50 −200 V V µA V V V V mV mA mA mA TxD TxD TxD 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 VIDR −1.0 −1.0 +0.5 +0.4 5.0 5.0 150 V V V V mV kΩ kΩ V V mA V V V V kV/µs Differential Input Voltage Dominant VIDD 0.9 1.0 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 VHYS RIN RDIFF VOL VOH IOS VREF VOL VOH VTH(SENSE) −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 5 20 0.2 VDD1 − 0.2 25 100 0.4 85 3.025 0.2 VDD1 − 0.2 0.4 2.5 VDD1 − 0.3 7 2.025 IOUT = 1.5 mA IOUT = −1.5 mA VOUT = GND1 or VDD1 |IREF = 50 µA| IOSENSE = 1.5 mA IOSENSE = −1.5 mA VDD2 VCM = 1 kV, transient, magnitude = 800 V VDD1 − 0.3 2.0 25 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. 0 | Page 3 of 20 ADM3054 TIMING SPECIFICATIONS Data Sheet 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 Propagation Delay TxD Off to Bus Inactive RECEIVER Propagation Delay TxD On to Receiver Active 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 1 tonTxD toffTxD 90 120 Typ Max Unit Mbps ns ns 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 tonRxD toffRxD 200 250 ns ns tSE tSD 300 10 µs ms Rev. 0 | Page 4 of 20 Data Sheet REGULATORY INFORMATION (PENDING) Table 3. ADM3054 Approvals (Pending) Organization UL VDE Approval Type To be recognized under the component recognition program of Underwriters Laboratories, Inc. To be certified according to DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12 ADM3054 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) Minimum External Tracking (Creepage) Minimum Internal Gap (Internal Clearance) Tracking Resistance (Comparative Tracking Index) Isolation Group Symbol L(I01) L(I02) Value 5000 8.0 7.6 0.017 min >175 IIIa Unit V rms mm mm mm V Conditions 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) CTI Rev. 0 | Page 5 of 20 ADM3054 VDE 0884 INSULATION CHARACTERISTICS (PENDING) Data Sheet 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 Characteristic Unit DIN VDE 0110 VIORM VPR I to IV I to III I to II 40/125/21 2 846 1590 V peak V peak VIORM × 1.875 = VPR, 100% production tested, tm = 1 sec, partial discharge < 5 pC VIORM × 1.6 = VPR, tm = 60 sec, partial discharge < 5 pC VIORM × 1.2 = VPR, tm = 60 sec, partial discharge < 5 pC VPR VPR VTR TS IS, INPUT IS, OUTPUT RS 1357 1018 6000 150 265 335 >109 V peak V peak V peak °C mA mA Ω Rev. 0 | Page 6 of 20 Data Sheet 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 −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 ADM3054 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 Rev. 0 | Page 7 of 20 ADM3054 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS NC 1 GND1 2 GND1 3 VDD2SENSE 4 16 15 Data Sheet GND2 NC NC ADM3054 14 13 VDD2 TOP VIEW RxD 5 (Not to Scale) 12 CANH TxD 6 VDD1 7 GND1 8 NOTES 1. NC = NO CONNECT. 11 10 9 CANL VREF GND2 10274-009 Figure 2. Pin Configuration Table 7. Pin Function Descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Mnemonic NC GND1 GND1 VDD2SENSE RxD TxD VDD1 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. 0 | Page 8 of 20 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 170 VDD1 = 3.3V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V ADM3054 205 VDD1 = 3.3V, TA = 25°C VDD1 = 5V, TA = 25°C PROPAGATION DELAY TxD ON TO RECEIVER ACTIVE, tONRxD (ns) 165 PROPAGATION DELAY TxD OFF TO RECEIVER INACTIVE, tOFFRxD (ns) 10274-010 200 160 195 155 190 150 145 185 –25 0 25 50 75 100 125 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 TEMPERATURE (°C) SUPPLY VOLTAGE, VDD2 (V) Figure 3. Propagation Delay from TxD On to Receiver Active vs. Temperature 155 154 PROPAGATION DELAY TxD ON TO RECEIVER ACTIVE, tONRxD (ns) Figure 6. Propagation Delay from TxD Off to Receiver Inactive vs. Supply Voltage, VDD2 RECEIVER INPUT VOLTAGE HYSTERESIS, VHYS (V) 156 155 154 153 152 151 150 149 148 147 VDD1 = 3.3V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V VDD1 = 3.3V, TA = 25°C VDD1 = 5V, TA = 25°C 153 152 151 150 149 148 147 146 4.75 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 10274-011 –25 0 25 50 75 100 125 SUPPLY VOLTAGE, VDD2 (V) TEMPERATURE (°C) Figure 4. Propagation Delay from TxD On to Receiver Active vs. Supply Voltage, VDD2 250 240 PROPAGATION DELAY TxD OFF TO RECEIVER INACTIVE, tOFFRxD (ns) Figure 7. Receiver Input Hysteresis vs. Temperature 90 PROPAGATION DELAY TxD OFF TO BUS INACTIVE, tOFFTxD (ns) VDD1 = 3.3V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V VDD1 = 3.3V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V 85 230 220 210 200 190 180 170 –50 80 75 70 65 10274-012 –25 0 25 50 75 100 125 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) Figure 5. Propagation Delay from TxD Off to Receiver Inactive vs. Temperature Figure 8. Propagation Delay from TxD Off to Bus Inactive vs. Temperature Rev. 0 | Page 9 of 20 10274-015 60 –50 10274-014 146 –50 10274-013 140 –50 180 4.75 ADM3054 78 VDD1 = 3.3V, TA = 25°C VDD1 = 5V, TA = 25°C PROPAGATION DELAY TxD OFF TO BUS INACTIVE, tOFFTxD (ns) 42 41 SUPPLY CURRENT, IDD2 (mA) 40 39 38 37 36 35 34 100 DATA RATE (kbps) VDD1 = 3.3V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V Data Sheet 77 76 75 74 73 72 71 4.75 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 10274-016 1000 SUPPLY VOLTAGE, VDD2 (V) Figure 9. Propagation Delay from TxD Off to Bus Inactive vs. Supply Voltage, VDD2 54 VDD1 = 3.3V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V PROPAGATION DELAY TxD ON TO BUS ACTIVE, tONTxD (ns) Figure 12. Supply Current (IDD2) vs. Data Rate 1.2 52 50 48 46 44 42 40 –50 SUPPLY CURRENT, IDD1 (mA) 1.0 0.8 0.6 0.4 0.2 VDD1 = 3.3V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V 10274-017 –25 0 25 50 75 100 125 1000 DATA RATE (kbps) TEMPERATURE (°C) Figure 10. Propagation Delay from TxD On to Bus Active vs. Temperature 50 49 PROPAGATION DELAY TxD ON TO BUS ACTIVE, tONTxD (ns) 2.35 Figure 13. Supply Current (IDD1) vs. Data Rate VDD1 = 3.3V, TA = 25°C VDD1 = 5V, TA = 25°C DIFFERENTIAL OUTPUT VOLTAGE DOMINANT, VOD (V) 2.30 48 47 46 45 44 43 42 4.75 2.25 2.20 2.15 VDD1 = 5V, VDD2 = 5V, RL = 45Ω VDD1 = 5V, VDD2 = 5V, RL = 60Ω 10274-018 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 –25 0 25 50 75 100 125 SUPPLY VOLTAGE, VDD2 (V) TEMPERATURE (°C) Figure 11. Propagation Delay from TxD On to Bus Active vs. Supply Voltage, VDD2 Figure 14. Driver Differential Output Voltage Dominant vs. Temperature Rev. 0 | Page 10 of 20 10274-021 2.10 –50 10274-020 0 100 10274-019 Data Sheet DIFFERENTIAL OUTPUT VOLTAGE DOMINANT, VOD (V) RECEIVER OUTPUT VOLTAGE LOW, VOL (mV) ADM3054 140 VDD1 = 3.3V, VDD2 = 5V VDD1 = 5V, VDD2 = 5V 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.9 4.75 VDD1 = 5V, VDD2 = 5V, RL = 45Ω VDD1 = 5V, VDD2 = 5V, RL = 60Ω 130 120 110 100 90 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 10274-022 –25 0 25 50 75 100 125 SUPPLY VOLTAGE, VDD2 (V) TEMPERATURE (°C) Figure 15. Driver Differential Output Voltage Dominant vs. Supply Voltage, VDD2 4.90 RECEIVER OUTPUT VOLTAGE HIGH, VOH (V) Figure 17. Receiver Output Low Voltage vs. Temperature 2.70 2.65 REFERENCE VOLTAGE, VREF (V) VDD1 = 5V, VDD2 = 5V 4.89 2.60 2.55 2.50 2.45 2.40 2.35 –50 4.88 4.87 4.86 4.85 VDD1 = 5V, VDD2 = 5V, IREF = +50μA VDD1 = 5V, VDD2 = 5V, IREF = –50μA 10274-023 –25 0 25 50 75 100 125 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) Figure 16. Receiver Output High Voltage vs. Temperature Figure 18. VREF vs. Temperature Rev. 0 | Page 11 of 20 10274-025 4.84 –50 10274-024 80 –50 ADM3054 146 VDD1 = 5V, VDD2 = 5V 144 142 140 138 136 134 132 130 10274-026 Data Sheet 2.42 VDD1 = 5V, VDD2 = 5V 2.40 VDD2SENSE THRESHOLD VOLTAGE HIGH TO LOW, VTH (SENSE) (V) VDD2SENSE ENABLE TIME, tSE (ns) 2.38 2.36 2.34 2.32 2.30 2.28 2.26 –50 –25 0 25 50 75 100 125 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) Figure 19. Enable Time, VDD2 High to VDD2SENSE Low vs. Temperature 200 VDD1 = 5V, VDD2 = 5V Figure 21. VDD2 Voltage Sense Threshold Voltage High to Low vs. Temperature 198 VDD2SENSE DISABLE TIME, tSD (ns) 196 194 192 190 188 186 184 10274-027 182 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) Figure 20. Disable Time, VDD2 Low to VDD2SENSE High vs. Temperature Rev. 0 | Page 12 of 20 10274-028 128 –50 Data Sheet TEST CIRCUITS AND SWITCHING CHARACTERISTICS TxD VOD VCANH RL 2 RL 2 VCANL VOC 10274-006 ADM3054 CANH 10274-002 VID CANL CL RxD Figure 22. Driver Voltage Measurement CANH Figure 24. Receiver Voltage Measurements TxD RL CL CANL RxD 15pF Figure 23. Switching Characteristics Measurements VRxD HIGH 10274-003 LOW VHYS 0.5 0.9 VID (V) Figure 25. Receiver Input Hysteresis 5V VDD2 0V VTH(SENSE) VTH(SENSE) tSE tSD VDD1 VDD2SENSE 0.4V 0V VDD1 – 0.3 10274-005 Figure 26. VDD2SENSE Enable/Disable Time Rev. 0 | Page 13 of 20 10274-004 ADM3054 VDD1 0.7VDD1 VTxD 0V 0.25VDD1 Data Sheet VOD VDIFF = VCANH – VCANL VDIFF 0.9V 0.5V VOR tONTxD VDD1 tOFFTxD VDD1 – 0.3V VRxD 0V 0.4VCC tONRxD tOFFRxD Figure 27. Driver and Receiver Propagation Delay VDD2 10274-007 1µF VDD1 ISOLATION BARRIER VDD2 VOLTAGE SENSE CAN TRANSCEIVER VDD2SENSE DECODE ENCODE THERMAL SHUTDOWN VDD2 ADM3054 TxD ENCODE DECODE D CANH R RL CANL VOLTAGE REFERENCE VREF RxD DECODE DIGITAL ISOLATION iCoupler® LOGIC SIDE ENCODE BUS SIDE GND2 10274-008 GND1 Figure 28. Supply Current Measurement Test Circuit Rev. 0 | Page 14 of 20 Data Sheet THEORY OF OPERATION CAN TRANSCEIVER OPERATION 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 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. ADM3054 TRUTH TABLES The truth tables in this section use the abbreviations listed in Table 8. 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 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 10. Receiving Supply Status VDD1 VDD2 On On On On On On On On Off On On Off 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 Rev. 0 | Page 15 of 20 ADM3054 ELECTRICAL ISOLATION 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. Data Sheet 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 ISOLATION BARRIER VDD2 VOLTAGE SENSE CAN TRANSCEIVER VDD2SENSE DECODE ENCODE THERMAL SHUTDOWN iCoupler Technology The digital signals transmit across the isolation barrier using iCoupler technology. This technique uses chip scale transformer VDD1 ADM3054 TxD ENCODE DECODE D R RxD DECODE DIGITAL ISOLATION iCoupler® LOGIC SIDE BUS SIDE ENCODE VOLTAGE REFERENCE CANH CANL VREF GND1 GND2 Figure 29. Digital Isolation and Transceiver Sections Rev. 0 | Page 16 of 20 10274-029 Data Sheet 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 ADM3054 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. 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  − dβ  2 V = ∑ πrn ; n = 1, 2, …, N  dt  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). 100 MAXIMUM ALLOWABLE CURRENT (kA) DISTANCE = 1m 100 DISTANCE = 5mm 10 DISTANCE = 100mm 1 MAXIMUM ALLOWABLE MAGNETIC FLUX DENSITY (kGAUSS) 10 0.1 1 0.1 10k 100k 1M 10M MAGNETIC FIELD FREQUENCY (Hz) 100M 0.01 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 Rev. 0 | Page 17 of 20 10274-030 0.001 1k 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. 10274-031 0.01 1k ADM3054 APPLICATIONS INFORMATION TYPICAL APPLICATIONS 3.3 OR 5V SUPPLY 5V ISOLATED SUPPLY CT 100nF 3.3 OR 5V SUPPLY VDD1 100nF ISOLATION BARRIER VDD2 VOLTAGE SENSE CAN TRANSCEIVER VDD2SENSE DECODE ENCODE THERMAL SHUTDOWN VDD2 100nF Data Sheet RT/2 RT/2 ADM3054 CAN CONTROLLER TxD ENCODE DECODE D BUS CONNECTOR CANH RxD DECODE DIGITAL ISOLATION iCoupler® LOGIC SIDE BUS SIDE RT/2 RT/2 10274-032 R ENCODE VOLTAGE REFERENCE VREF CANL GND1 NOTES 1. RT iS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE USED. GND2 CT Figure 32. Typical Isolated CAN Node Using the ADM3054 Rev. 0 | Page 18 of 20 Data Sheet RT/2 ADM3054 RT/2 CT RT/2 CANH CANL CANH CANL CANH CANL RT/2 CT ADM3054 ADM3054 ADM3054 R D VDD2 SENSE R D VDD2 SENSE R D VDD2 SENSE GALVANIC ISOLATION GALVANIC ISOLATION GALVANIC ISOLATION TxD RxD VDD2SENSE TxD RxD VDD2SENSE TxD RxD VDD2SENSE 10274-033 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. 0 | Page 19 of 20 ADM3054 PACKAGING AND ORDERING INFORMATION OUTLINE DIMENSIONS Data Sheet 10.50 (0.4134) 10.10 (0.3976) 16 9 7.60 (0.2992) 7.40 (0.2913) 1 8 10.65 (0.4193) 10.00 (0.3937) 1.27 (0.0500) BSC 0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 0.51 (0.0201) 0.31 (0.0122) 2.65 (0.1043) 2.35 (0.0925) 0.75 (0.0295) 45° 0.25 (0.0098) 8° 0° 0.33 (0.0130) 0.20 (0.0079) 1.27 (0.0500) 0.40 (0.0157) SEATING PLANE 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 ADM3054BRWZ ADM3054BRWZ-RL7 EVAL-ADM3054EBZ 1 Temperature Range −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] Evaluation Board 03-27-2007-B Package Option RW-16 RW-16 Z = RoHS Compliant Part. ©2011 Analog Devices, Inc. All rights reserved. Trademarks and r egistered trademarks are the property of their respective owners. D10274-0-10/11(0) www.analog.com/ADM3054 Rev. 0 | Page 20 of 20