10.3.4 Standby

If a high-level input (> 0.75 V_CC) is applied to R_S (pin 8), the circuit enters a low-current, listen only standby mode during which the driver is switched off and the receiver remains active. If using this mode to save system power while waiting for bus traffic, the local controller can monitor the R output pin for a falling edge which indicates that a dominant signal was driven onto the CAN bus. The local controller can then drive the R_S pin low to return to slope control mode or high-speed mode.