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Watchdog for voltage detector display

  • US 9,128,129 B2
  • Filed: 09/05/2012
  • Issued: 09/08/2015
  • Est. Priority Date: 09/05/2011
  • Status: Active Grant
First Claim
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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.

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