Patent ID: 8067952

Claim:
An ESD detection circuit for detecting a level of an ESD voltage on a power rail, comprising: a first resistive component coupled between a first detection node and a ground node corresponding to the power rail; a first diode unit coupled between the power rail and the first detection node in a forward direction toward the power rail, the first diode unit having a first breakdown voltage; a second resistive component coupled between a second detection node and the ground node; a second diode unit coupled between the power rail and the second detection node in a forward direction toward the power rail, the second diode unit having a second breakdown voltage different from the first breakdown voltage; and a controller, coupled to the first detection node, for determining the level of the ESD voltage based on the voltage of the first detection node and the first breakdown voltage, wherein the controller is also coupled to the second detection node, and the controller determines the level of the ESD voltage further based on the voltage of the second detection node and the second breakdown voltage.