Vcc in transceiver TJA1050

[marciofigueired]

I would like to know how can I use the TJA1050 transceiver on my 3.3V platforms ?? In your manual it says it is compatible, but I still have doubts, because the transceiver is powered with Vcc = 5V. I will use the GR-PEACH platforms, LTeK IoT LPC546xx and PSoC Cypress 5L, where GP-IO are 3.3V.
Will this cause damage to my platforms or will I be able to use it without causing future problems?

I look forward to your reply.
Thankful!

Marcio

[reyes]

Hi Marcio,

You can find the latest version of the datasheet in the following link: https://www.nxp.com/docs/en/data-sheet/TJA1050.pdf

As you can see in the characteristic table on page 6 of the datasheet, TXD and RXD pins are referenced to VCC voltage, so I don’t think that the TJA1050 can be used for 3.3V application.  

I recommend you to switch to a different CAN transceiver with equipped with a dedicated VIO pin, NXP CAN transceivers can interface directly to microcontrollers with supply voltages of 3.3 V and 5 V if equipped with this pin.

TJA1051T/3 seems to be a good option for you. Pin VIO on the TJA1051T/3 and TJA1051TK/3 should be connected to the microcontroller supply voltage (see Figure 6 of datasheet). This will adjust the signal levels of pins TXD, RXD and S to the I/O levels of the microcontroller

TJA1051 datasheet: https://www.nxp.com/docs/en/data-sheet/TJA1051.pdf

Regards,

Jose

NXP Semiconductors