Patent ID: 6873193
Filing Date: 2005-03-29
Classification: G01R,H03K

Abstract:
1. A two-level supply voltage detection circuit, comprising: a LV-side power supply detection circuit connected to a HV-side power supply, the LV-side power supply detection circuit outputting a first signal which is active when a voltage input from the HV-side power supply has a value equal to or higher than a LV-side reference value; a HV-side power supply detection circuit connected to the HV-side power supply, the HV-side power supply detection circuit outputting a second signal which is active when a voltage input from the HV-side power supply has a value equal to or higher than a HV-side reference value that is higher than the LV-side reference value; detection operation control means which receives the second signal from the HV-side power supply detection circuit and inactivates the operation of the LV-side power supply detection circuit when the second signal is active; and LV-side power supply detection output fixing means which receives the second signal and outputs an active third signal as a signal corresponding to the first signal when the second signal is active.