TJA1145 休眠问题

[safierhu]

关于CAN收发器TJA1145T芯片，外部总线有报文时能休眠吗？如果该芯片在外部无报文时能正常休眠，有报文时不能正常休眠是什么原因呢？

[safierhu]

TJA1145 has two battery source，one is for the chip work（VDD should be 5V）， and the other is for the SPI bus(the voltage is based on host controller, should be 3.3V in common), if the later voltage supply in 5V, which will cause error operation on SPI bus by chance, and the register operation on TJA1145 may failed.

[safierhu]

This problem has been solved,as the register of #63h should be cleared just before setting  the TJA1145 into sleep mode with selective wake-up. I have cleared the #63h early before , maybe it has been waked up by the signal on the CAN bus more quickly.