ZHCSOO3A May 2021 – December 2021
PRODUCTION DATA
The TCAN1162-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 VIO 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.
The nSLP pin is weakly pulled down which forces the device into the low-power sleep mode if the terminal is left floating. See Table 9-1.
| TERMINAL | PULL-UP or PULL-DOWN | COMMENT |
|---|---|---|
| TXD | Pull-up | Weakly biases TXD toward recessive to prevent bus blockage or TXD DTO triggering |
| nSLP | Pull-down | Weakly biases the nSLP terminal towards low power sleep mode to prevent excessive system power |