CAN Transceiver short mode

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CAN Transceiver short mode

213 Views
恵介松上
Contributor I

Hi, I am checking that our board is protected form short circuit.

 

We use TJA1043T(can transceiver).

Question 1.CANH & CANL are shorted during communication.

Does TJA1043's protection circuit operate?

Should we protect TJA1043 with software by detecting ERR_N? 

If software protection is necessary, how many seconds will it break down in the shortest time?

 

Question 2.CANH & GND are shorted during communication.

Does TJA1043's protection circuit operate?

Should we protect TJA1043 with software by detecting ERR_N? 

If software protection is necessary, how many seconds will it break down in the shortest time?

 

Question 3.CANH & Vcc are shorted during communication.

Does TJA1043's protection circuit operate?

Should we protect TJA1043 with software by detecting ERR_N? 

If software protection is necessary, how many seconds will it break down in the shortest time?

 

Question 4.CANH is opened during communication.

Does TJA1043's protection circuit operate?

Should we protect TJA1043 with software by detecting ERR_N? 

If software protection is necessary, how many seconds will it break down in the shortest time?

 

Question 5.CANL & GND are shorted during communication.

Does TJA1043's protection circuit operate?

Should we protect TJA1043 with software by detecting ERR_N? 

If software protection is necessary, how many seconds will it break down in the shortest time?

 

Question 6.CANL & Vcc are shorted during communication.

Does TJA1043's protection circuit operate?

Should we protect TJA1043 with software by detecting ERR_N? 

If software protection is necessary, how many seconds will it break down in the shortest time?

 

Question 7.CANL is opened during communication.

Does TJA1043's protection circuit operate?

Should we protect TJA1043 with software by detecting ERR_N? 

If software protection is necessary, how many seconds will it break down in the shortest time?

 

 

If the shortest failure time is unknown, please answer other questions.

 

best regard.

1 Reply

93 Views
PetrS
NXP TechSupport
NXP TechSupport

Hi,

the TJA1043 is only able to detect some kind of bus failures.

The bus failure diagnosis is discussed in AN1014 in chapter 6.6; http://www.nxp.com/documents/report/AH1014_v1_4_Application_Hints_TJA1042_43_48_51.pdf

Chapter 6.9 also gives you suggestion for the SW flow for handling failures.

BR, Petr