TCAN3413 datasheet(19/45 Pages) TI1

No. de pieza	TCAN3413

Descripción Electrónicos	TCAN341x 3.3-V CAN FD Transceivers With Standby Mode and ±58 V Bus Standoff

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Fabricante Electrónico	TI1 [Texas Instruments]

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Normal CAN communication

CAN Bus Signal

TXD fault stuck dominant: example PCB failure or bad software

Fault is repaired & transmission capability

restored

TXD (driver)

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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 7-4. Example Timing Diagram for TXD Dominant Timeout

7.3.4 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.

7.3.5 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

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TCAN3413, TCAN3414

SLLSFS8A – MARCH 2023 – REVISED NOVEMBER 2023

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