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1. Comparison PCA82C252 / TJA1053 / TJA1054..........................................................................31.1. System parameters ..................................................................................................................31.2. Device parameters ...................................................................................................................32. Series Resistor at Pin BAT of the TJA1053 / TJA1054..............................................................43. Vcc Supply and Recommended Bypass Capacitance ..............................................................53.1. List of used Abbreviations.........................................................................................................53.2. Summary.................................................................................................................................63.3. Average Supply Current at Absence of Bus Short-Circuit Conditions.........................................73.3.1. Maximum dominant supply current (without bus wiring faults) .............................................73.3.2. Example calculation ...........................................................................................................73.3.3. Thermal considerations (without bus wiring faults) ..............................................................73.3.4. Example calculation ...........................................................................................................73.4. Average Supply Current at Presence of a Short-Circuit of one Bus Wire ..................................83.4.1. Maximum dominant supply current (with CANH shorted to GND)........................................83.4.2. Example calculation ...........................................................................................................83.4.3. Thermal considerations (with CANH shorted to GND).........................................................83.4.4. Example calculation ...........................................................................................................83.4.5. Vcc extra supply current in single fault condition.................................................................93.4.6. Example calculation ...........................................................................................................93.5. Worst Case Max Vcc Supply at Presence of a Dual Short Circuit ............................................103.5.1. Max Vcc supply current in worst case dual fault condition.................................................103.5.2. Example calculation .........................................................................................................103.5.3. Vcc extra supply current in dual fault condition .................................................................113.5.4. Example calculation .........................................................................................................113.6. Calculation of worst-case bypass capacitor.............................................................................113.6.1. Example calculation, separate supplied transceiver @ 83,33kBit/s ...................................123.6.2. Example calculation, shared supply..................................................................................124. Calculation of Bus Termination Resistors and EMC issues...................................................134.1. How to dimension the Bus Termination Resistor values, some basic rules ..............................134.1.1. Variable System Size, Optional Nodes .............................................................................134.1.2. Example calculation, Variable System Size ......................................................................144.2. Tolerances of Bus Termination Resistors, EMC Considerations..............................................144.3. Output Current and Power Dissipation of Bus Termination Resistors RT..................................154.3.1. Summary .........................................................................................................................154.3.2. Average power dissipation, no bus failures.......................................................................154.3.3. Example calculation, average power dissipation...............................................................154.3.4. Maximum continuous power dissipation............................................................................154.3.5. Example calculation, maximum continuous power dissipation...........................................154.3.6. Maximum peak power dissipation.....................................................................................164.3.7. Example calculation, maximum peak power dissipation....................................................165. ESD Protection Circuit Concept ..............................................................................................16
