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Hello Richard,
Pin TXD has an internal pull-up to VIO and pins STB_N and EN have internal pull-downs to GND to ensure a safe, defined state in case one, or all, of these pins is left floating.
Pull-up/pull-down resistors are present on these pins in all states. Pull-down on pin EN is only active when VBAT is present.
As long as STB_N and EN are not correctly driven by the μC during power-on, reset or in case of a system failure, the transceiver stays in Standby mode to prevent the bus to be driven dominant.
If the STB_N and EN pins are not used they shall be connected to VIO to enable a default Normal mode.
Best regards,
Tomas
Hello Richard,
Pin TXD has an internal pull-up to VIO and pins STB_N and EN have internal pull-downs to GND to ensure a safe, defined state in case one, or all, of these pins is left floating.
Pull-up/pull-down resistors are present on these pins in all states. Pull-down on pin EN is only active when VBAT is present.
As long as STB_N and EN are not correctly driven by the μC during power-on, reset or in case of a system failure, the transceiver stays in Standby mode to prevent the bus to be driven dominant.
If the STB_N and EN pins are not used they shall be connected to VIO to enable a default Normal mode.
Best regards,
Tomas