| 摘要 |
The invention relates to a circuit for protecting an electronic functional unit (IC3) connected to a data line (Ltg. 1) against positive and negative overvoltages. The circuit has an analog switch (IC2) arranged in the data line (Ltg. 1) before the electronic functional unit (IC3). The circuit also comprises a voltage monitor, which is designed to control the analog switch (IC2), wherein the voltage monitor is designed to close the analog switch (IC2) if no overvoltage occurs and to open the analog switch (IC2) if an overvoltage occurs. The circuit also functions in an energy-saving mode and/or if no supply voltage is applied. A low resistance and a bidirectionality of the data line (Ltg. 1) are maintained. |
