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TCAN3413 Datasheet(PDF) 17 Page - Texas Instruments |
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TCAN3413 Datasheet(HTML) 17 Page - Texas Instruments |
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17 / 42 page  Normal CAN communication CAN Bus Signal TXD fault stuck dominant: example PCB failure or bad software Fault is repaired & transmission capability restored TXD (driver) %XV ZRXOG EH ³VWXFN GRPLQDQW´ EORFNLQJ FRPPXQLFDWLRQ IRU WKH ZKROH QHWZRUN EXW 7;' '72 prevents this and frees the bus for communication after the time tTXD_DTO. tTXD_DTO Communication from local node Communication from repaired node RXD (receiver) Communication from other bus node(s) Communication from repaired local node Communication from other bus node(s) tTXD_DTO Driver disabled freeing bus for other nodes Figure 8-4. Example Timing Diagram for TXD Dominant Timeout 8.3.4 CAN Bus short-circuit current limiting The devices have several protection features that limit the short-circuit current when a CAN bus line is shorted. These include CAN driver current limiting in the dominant and recessive states, and TXD dominant state timeout which prevents permanently having the higher short-circuit current of a dominant state in case of a system fault. During CAN communication the bus switches between the dominant and recessive states, thus the short-circuit current may be viewed as either the current during each bus state or as a DC average current. When selecting termination resistors or a common-mode choke for the CAN design the average power rating, IOS(AVG), should be used. The percentage dominant is limited by the TXD DTO and the CAN protocol which has forced state changes and recessive bits due to bit stuffing, control fields, and interframe space. This makes sure there is a minimum amount of recessive time on the bus even if the data field contains a high percentage of dominant bits. The average short-circuit current of the bus depends on the ratio of recessive to dominant bits and their respective short-circuit currents. The average short-circuit current may be calculated using Equation 2. IOS(AVG) = % Transmit x [(% REC_Bits x IOS(SS)_REC) + (% DOM_Bits x IOS(SS)_DOM)] + [% Receive x IOS(SS)_REC] (2) Where: • IOS(AVG) is the average short-circuit current • % Transmit is the percentage the node is transmitting CAN messages • % Receive is the percentage the node is receiving CAN messages • % REC_Bits is the percentage of recessive bits in the transmitted CAN messages • % DOM_Bits is the percentage of dominant bits in the transmitted CAN messages • IOS(SS)_REC is the recessive steady state short-circuit current • IOS(SS)_DOM is the dominant steady state short-circuit current The short circuit current and the possible fault cases of the network should be taken into consideration when sizing the power supply used to generate the transceivers VCC supply. 8.3.5 Thermal Shutdown (TSD) If the junction temperature of the devices exceed the thermal shutdown threshold, TTSD, the device turns off the CAN driver circuitry and blocks the TXD to bus transmission path. The shutdown condition is cleared when the junction temperature of the device drops below TTSD. The CAN bus pins are biased to ~ 1.9 V during a TSD www.ti.com TCAN3413, TCAN3414 SLLSFS8 – MARCH 2023 Copyright © 2023 Texas Instruments Incorporated Submit Document Feedback 17 Product Folder Links: TCAN3413 TCAN3414 |
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