ZHCSRW5A March 2023 – November 2023 TCAN3413 , TCAN3414
PRODUCTION DATA
The TCAN341x devices have internal pull-up/pull-down resistors on critical pins which place the device into known states if the pin floats. This internal bias should not be relied upon by design though, especially in noisy environments, but instead should be considered a failsafe protection feature.
When a CAN controller supporting open-drain outputs is used, an adequate external pull-up resistor must be chosen. This makes sure the TXD output of the CAN controller maintains acceptable bit time to the input of the CAN transceiver. See Table 7-3 for details on pin bias conditions.
| Pin | Pull-up or Pull-down | Comment |
|---|---|---|
| TXD | Pull-up | Weakly biases TXD towards recessive to prevent bus blockage or TXD DTO triggering |
| STB | Pull-up | Weakly biases STB towards low-power standby mode to prevent excessive system power |
| SHDN | Pull-down | Weakly biases SHDN towards normal mode to allow normal communication. SHDN pin has higher priority than STB for TCAN3414. |