About TJA1642BT STB pins

[Oido]

A problem occurred while attempting CAN function. The STB pin connected to the PTA 18 pin of S32K314 does not drop to 0V even if the signal is LOW. Given a LOW signal, the STB pin measures a voltage of approximately 1.9V. Also, even if R3 is removed and the circuit is cut off, the STB pin measures a voltage of approximately 0.7V, so the STB cannot be dropped to zero.
I understand that CAN IC operates when STB pin is below 0.3V and enters standby mode when STB pin is above 0.7V, am I correct in my understanding?
Please advise me to use it in NORMAL mode.
If CAN_STB is given a HIGH signal rather than LOW, the voltage of the STB pin is approximately 4.1V.

[TomasVaverka]

Hi,

The STB pin has an internal pull-up to VCC which creates a voltage divider with your resistor R4 resulting in a voltage drop on it.

Logic levels of the STB pin are defined in the datasheet. VIH min = 0.7 x VCC = 3.5V, VIL max = 0.3 x VCC = 1.5V.  

BRs, Tomas

[Oido]

I'm sorry. I wrote it in Korean.
Yes, I think the circuit configuration is wrong, but if I connect the STB pin and the GND of the PCB directly before I make a new circuit, the IC will not be able to enter standby mode, but will it still be available?

[TomasVaverka]

Hi,

Yes, if you connect the STB pin directly to GND, the device will be in the Normal mode and will not be able to enter the Standby mode.

BRs, Tomas

[Oido]

Thank you, but even if I do, my CAN doesn't work.. It works very well on EVB boards..
I posted a new question, can you take a look at it? I captured all of my situations and uploaded it.

[Oido]

네, 회로 구성이 잘못된 것 같아서 새 회로를 구축하기 직전에 STB 핀과 PCB의 GND를 연결하면 CAN IC가 STANDBY 모드로 들어가지 않지만 여전히 사용할 수 있습니까?