Activate low power Standby mode by setting STB terminal high. In this mode the bus transmitter will not send data nor will the normal mode receiver accept data as the bus lines are biased to ground minimizing the system supply current. Only the low power receiver will be actively monitoring the bus for activity. RXD indicates a valid wake up event after a wake-up pattern (WUP) has been detected on the Bus. The low power receiver is powered using only the VIO pin. This allows VCC to be removed reducing power consumption further.
The bus lines are biased to ground in Standby mode to minimize the required system supply current. The low power receiver is supplied by VIO and is capable of detecting CAN bus activity even if VIO is the only supply voltage available to the transceiver.