Patent ID: 9739845
Date: 2017-08-22
CPC Classifications: G01R

Claim:
1. A method for testing a signal path of a first housed IC that forms a monolithically integrated circuit on a semi-conductor body together with a magnetic field sensor and has a signal output and a power supply connection and a test mode state and a normal operating state, wherein, during the normal operating state, an output signal is provided at the signal output, the output signal being dependent on a signal which is tapped at the magnetic field sensor, and a second housed IC is provided that is formed as a control unit, wherein via the control unit, a switch from the normal operating state to the test mode state is performed in the first housed IC, the method comprising: switching off, in a first step, the power supply of the first IC; connecting, in a second step, the signal output with a reference potential; switching on, in a third step, the power supply of the first IC; disconnecting, in a fourth step, the signal output from the reference potential; and performing, subsequently in the test mode state, a test of the first IC by the first IC such that a test pattern is configured at the signal output or at the power supply connection and the test pattern is evaluated by the control unit for testing of the signal path.