TJA1040 can总线如何变为显性？

[lsy23]

我用5V给TJA1040供电，STB与TXD都接GND，测量CANH、CANL却为2.5V（隐性）；请问STB与TXD怎样接才能使CANH、CANL为显性呢？

[JozefKozon]

Dear Lee,

please pull the STB pin low (to GND) to set the TJA1040 to normal mode.

Then, by pulling the TXD pin low, the CANH and CANL pins will be set to recessive state. 

If you want to put the CANH and CANL pins to dominant state, please pull the TXD pin to high state. Minimally above 2V, maximally to VCC+0.3V. The TXD pins has an internal pull-up to the VCC pin. Leaving the TXD pin floating, should also set the CANH and CANL pins to dominant state.

With Best Regards,

Jozef