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. 05, 2001
Filed:
Jun. 07, 1999
Harold Ryan Macks, Redford, MI (US);
Visteon Global Technologies, Inc., Dearborn, MI (US);
Abstract
A passive processing circuit for processing a ground side switch closure to a CMOS input (,) of an MCU, particularly useful in a D.C. electrical system where ground offsets may occur, such as in an automotive vehicle. Three resistors (R,R,R,) are connected between supply and ground potentials of a D.C. power supply voltage (,). The junction of two (R,R,) connects to an output (,) of a grounded input switch (,). The junction of two (R,R,) connects to the CMOS input (,). A fourth resistor (R,) connects between the bi-directional input/output (,) of the MCU and the junction of the second and third resistors. The MCU executes an algorithm that selectively allows and disallows the resistor (R,) to coact with the second and third resistors. The circuit provides a cost-efficient solution for extending the range of supply line voltage over which a CMOS input can correctly read a switch closure.