ZHCSIP6D August 2019 – March 2025 TCAN1044-Q1
PRODUCTION DATA
The TCAN1044-Q1 has internal pull-ups 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 8-3 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 |