8.3.1 Bus Polarity Correction

THVD1505 automatically corrects a wrong bus-signal polarity caused by a mis-wire fault. In order to detect the bus polarity, the following conditions must be met.

• A slave node must enable the receiver (RE = low). Driver can be in either enabled or disabled state
• A and B signals should be static for longer than fail-safe time (t_FS)
• The absolute value of the differential voltage at the receiver input should be greater than the receiver thresholds (|V_IT+| or |V_IT-|)

The receiver input voltage can be defined either by using passive fail-safe resistors or by the master node actively driving the bus.