Patent ID: 7151462
Filing Date: 2006-12-19
Classification: H03K

Abstract:
1. A circuit arrangement for load diagnosis of a switch having a first and a second load connecting terminal, the circuit arrangement comprising: a first current source arrangement with a first connecting terminal, which can be connected to the first load connecting terminal of the switch, the first current source arrangement being designed to supply current in a first current direction to the first connecting terminal if the first load terminal is coupled to a first supply potential, and to supply current in a current direction opposite the first current direction to the first connecting terminal if the first load terminal is coupled to a second supply potential; a second current source arrangement with a second connecting terminal, which can be connected to the second load connecting terminal of the switch, the second current source arrangement being designed to supply current in a second current direction to the second connecting terminal if the second load terminal is coupled to the second supply potential, and to supply current in a current direction opposite the second current direction to the second connecting terminal if the second load terminal is coupled to the first supply potential; and an evaluation circuit, which evaluates the currents flowing to the first and second connecting terminals and provides a load state signal depending on the currents.