Will TJA1043 wake up from normal CAN traffic

[freddy_ben-zeev]

If I understand the specs of the TJA1043 and of CAN the remote wake up pattern is simple (a dominant time of 0.5-3usec, followed by similar length recessive time, followed by another dominant time of similar length. It looks like any '101' pattern in a message at 500kbps will be recognized as WUP. In other words - almost any traffic will wake up the TJA1043. Is this right? Or am I missing something?

Thanks,

Freddy

[JozefKozon]

Dear Freddy, 

your assumption is correct. Sometime the transceiver is awakened unintentionally, if the CAN traffic resemble the wake-up pattern. The wake-up detection cannot be disabled on the TJA1043. An option could be TJA1145 with selective wake-up. Please see a datasheet attached.

With Best Regards,

Jozef

[freddy_ben-zeev]

It looks like almost any traffic will wake up the TJA1043. As I said above - at 500kbps (which is our rate) any '101' pattern will cause a wake up. As far as disabling - we're currently just not using sleep mode on this chip (holding STB_N high). Thanks for the recommendation of the TJ1145 - we'll look into it.