Patents by Inventor Theodor Johannes Dippenaar

Theodor Johannes Dippenaar has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Programmable power supply and brownout detector for electronic equipment
    Patent number: 7225088
    Abstract: A programmable power supply and brownout detector for electronic equipment features independent, but coordinated, control of operating voltage and brownout reference voltage. Improper programming of the operating voltage and the brownout reference voltage levels is prevented. The threshold of the programmable power supply and brownout detector can also be controlled to provide an optimum threshold over a range of operating voltages.
    Type: Grant
    Filed: February 17, 2003
    Date of Patent: May 29, 2007
    Assignee: Microchip Technology Incorporated
    Inventors: Willem Smit, Theodor Johannes Dippenaar, Pieter Schieke
  • Programmable power supply and brownout detector for electronic equipment
    Publication number: 20030191596
    Abstract: A programmable power supply and brownout detector for electronic equipment features independent, but coordinated, control of operating voltage and brownout reference voltage. Improper programming of the operating voltage and the brownout reference voltage levels is prevented. The threshold of the programmable power supply and brownout detector can also be controlled to provide an optimum threshold over a range of operating voltages.
    Type: Application
    Filed: February 17, 2003
    Publication date: October 9, 2003
    Applicant: MICROCHIP TECHNOLOGY INCORPORATED
    Inventors: Willem Smit, Theodor Johannes Dippenaar, Pieter Schieke
  • Programmable power supply and brownout detector method for a microprocessor power supply
    Patent number: 6522981
    Abstract: A method for a microprocessor power supply system, which features a programmable power supply and a programmable brownout detector with a central control unit that allows for independent, but coordinated, control of operating voltage and brownout reference voltage. The invention prevents improper programming of the operating voltage and the brownout reference voltage levels. The programmable power supply and brownout detector threshold can also be controlled to provide an optimum threshold over a range of operating voltages.
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: February 18, 2003
    Assignee: Microchip Technology Incorporated
    Inventors: Willem Smit, Theodor Johannes Dippenaar, Pieter Schieke
  • Microprocessor power supply system comprising a programmable power supply and a programmable brownout detector
    Publication number: 20020013669
    Abstract: An improved microprocessor power supply system, which features a programmable power supply and a programmable brownout detector with a central control unit that allows for independent, but coordinated, control of operating voltage and brownout reference voltage. The invention prevents improper programming of the operating voltage and the brownout reference voltage levels. The programmable power supply and brownout detector threshold can also be controlled to provide an optimum brownout threshold over a range of operating voltages.
    Type: Application
    Filed: October 15, 2001
    Publication date: January 31, 2002
    Inventors: Willem Smit, Theodor Johannes Dippenaar, Pieter Schieke
  • Microprocessor power supply system including a programmable power supply and a programmable brownout detector
    Patent number: 6304823
    Abstract: A microprocessor power supply system, which features a programmable power supply and a programmable brownout detector with a central control unit that allows for independent, but coordinated, control of operating voltage and brownout reference voltage. The invention prevents improper programming of the operating voltage and the brownout reference voltage levels. The programmable power supply and brownout detector threshold can also be controlled to provide an optimum threshold over a range of operating voltages.
    Type: Grant
    Filed: September 16, 1998
    Date of Patent: October 16, 2001
    Assignee: Microchip Technology Incorporated
    Inventors: Willem Smit, Theodor Johannes Dippenaar, Pieter Schieke
  • Secure token integrated circuit and method of performing a secure authentication function or transaction
    Patent number: 5841866
    Abstract: A method of operating a circuit such as an integrated circuit carried on a plastic card which includes the steps of accepting a challenge, and generating a first response to the challenge using a first algorithm which operates on at least the challenge and a secret key derived from information relating to the circuit. The challenge may be generated, and accepted, by the circuit, with a corresponding challenge being generated externally of the circuit. Alternatively, the challenge is generated externally of the circuit and is then accepted by the circuit. A token count may be stored in the circuit and the first response is generated if a decrement command is successfully carried out on the token count.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: November 24, 1998
    Assignee: Microchip Technology Incorporated
    Inventors: Frederick Johannes Bruwer, Pieter Jacobus Pretorius, Theodor Johannes Dippenaar