The invention provides a conflict detector (15; 15A; 15B; 25; 35) for a serial bus system (1) and a method for detecting a bus conflict in a serial bus system (1). The conflict detector (15; 15A; 15B; 25; 35) has a first filter block (151) for filtering a signal (VDIFF) received serially from a bus (40) of the bus system (1), a second filter block (152) for filtering a digital transmitted signal (TxD; TxD1) that was sent serially to the bus (40) by a communication control device (11) of the subscriber station (10; 20; 30) for a frame (450), wherein the subscriber station (10; 20; 30) is designed to produce bus states (401; 402) for the frame (450) using a first mode in a first communication phase (451; 453, 451) and to produce bus states (401; 402; U_D0; U_D1) for the frame (450) using a second mode, which differs from the first mode, in a second communication phase (452), and a detection block (153; 153A) that has a capacitor (1532), one connection of which has an output of the first filter block (151) and an output of the second filter block (152) connected to it, wherein the detection block (153; 153A) is designed to detect from a voltage (U_C) across the capacitor (1532) whether or not the subscriber station (10; 20; 30) has exclusive, collision-free access to the bus (40) in the second communication phase (452).
展开▼
