The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 2013
Filed:
Mar. 26, 2010
Enrique Aleman, Gilbert, AZ (US);
Jonathan Dillon, Tempe, AZ (US);
Vivien Delport, Chandler, AZ (US);
Joseph Julicher, Maricopa, AZ (US);
Enrique Aleman, Gilbert, AZ (US);
Jonathan Dillon, Tempe, AZ (US);
Vivien Delport, Chandler, AZ (US);
Joseph Julicher, Maricopa, AZ (US);
Microchip Technology Incorporated, Chandler, AZ (US);
Abstract
A failsafe oscillator monitor and alarm circuit receives clock pulses from an external oscillator that if a failure thereto occurs, the failsafe oscillator monitor and alarm circuit will notify a digital processor of the external oscillator failure. The failsafe oscillator monitor and alarm circuit is a very low current usage circuit that charges a storage capacitor with clock pulses from the external oscillator when functioning normally and discharges the storage capacitor with a constant current sink if the external oscillator stops functioning. When the voltage charge on the storage capacitor becomes less than a reference voltage an alarm signal is sent to the digital processor for exception or error handling of the failed external oscillator.