ZHCSPG0 December 2021 TCAN1167-Q1
PRODUCTION DATA
The TCAN1167-Q1 has internal pull-ups and pull-downs on critical pins to ensure a known operating behavior if the pins are left floating.
The TXD pin is pulled up to VCCOUT which forces a recessive level if the pin floats. This internal bias should not be relied upon by design but rather a fall-safe option. Special care needs to be taken when the devive is used with a CAN controller that has open drain outputs. The device implements a weak internal pull-up resistor on the TXD pin. The CAN bit timing for CAN FD data rates will require special consideration and the pull-up strength should be considered carfully when using open drain outputs. An adequate external pull-up resistor must be used to ensure that the TXD output of the CAN controller maintains adequate bit timing input to the CAN device.
| TERMINAL | PULL-UP or PULL-DOWN | COMMENT |
|---|---|---|
| TXD | Pull-up | Weakly biases TXD toward recessive to prevent bus blockage or TXD DTO triggering |
| nCS | Pull-up | Weakly biases nCS high to prevent un-intended SPI communication |
| SCLK | Pull-down | Weakly biased to ground |
| INH | Pull-down | Weakly biased to ground |