Patent ID: 9128129
Filing Date: 2015-09-08
Classification: G01R

Abstract:
1. A voltage detector that detects voltage, the voltage detector comprising: a microcontroller configured to control writing of detected voltage values to a display, wherein the display is configured to display information indicative of detected voltage values; a display controller configured to control the display, wherein the microcontroller is external to the display controller; and a watchdog timer that is coupled to an output of the microcontroller and to at least one input of the display controller, wherein the watchdog timer is configured to determine a malfunction of the microcontroller, wherein the watchdog timer is further configured to trigger a visual warning that includes a modification of the information indicative of detected voltage values on the display by causing an asynchronous reset of the display controller, if a malfunction is determined, and wherein the malfunction is determined if a specific sequence of signals from the microcontroller is not received by the watchdog timer within a predetermined time period.