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.
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
