TCAN1145-Q1: Wake up without CANFD frame selective ID

Is there a pull-down resistor about wake PIN inside the TCAN1145?

Hi User,

Yes, TCAN1145 includes an internal pull-down on the WAKE pin. Therefore, the most efficient external condition for this signal is a low-level input to reduce leakage. 

Regards,
Eric Schott

In our PCBA，the wake PIN of 1145 is float, not connected to other device.It's OK?

Does it support wake-up on a specific CAN frame ID，at the same time,Ignore CANFD frame wakeup?

Our products have been mass-produced, but now we need to replace TJA1145ATK/FD/0Z, please help to see if the current hardware schematics meet the requirements

Our products have been mass-produced, but now we need to replace TJA1145ATK/FD/0Z, please help to see if the current hardware schematics meet the requirements

Hi,

Because TCAN1145 has an internal bias for the WAKE pin, it is fine to leave this pin floating if unused. If possible, connecting this pin to GND will increase noise immunity and stabilize the signal during initial power-up, but this is not required. 

TCAN1145 can be configured for selective wake while ignoring CAN FD frames by setting SW_FD_PASSIVE = 1 in the SW_CONFIG_1 register (h44). 

The schematic here looks good. No hardware changes are required when switching from this competitor device to TCAN1145. Software changes will need to be implemented to support the different SPI requirements and register maps of TCAN1145. 

Regards,
Eric Schott