Willem J Marneweck

US Patent:

6446212, Sep 3, 2002

Filed:

Aug 28, 1998

Appl. No.:

09/141899

Inventors:

Willem Smit - Chandler AZ
Johannes Albertus van Niekerk - Chandler AZ
Willem Jabcobus Marneweck - Tempe AZ
Frederick J. Bruwer - Paarl, ZA

Assignee:

Microchip Technology Incorporated - Chandler AZ

International Classification:

G06F 126

US Classification:

713300, 712 1, 712 32, 712 38, 323271, 323275

Abstract:

A processing unit, preferably a RISC based microcontroller, is coupled to a processing unit voltage regulator. The processing unit voltage regulator is used for controlling an operating voltage of the processing unit. A control unit is coupled to the processing unit voltage regulator and to the processing unit for setting a regulated voltage level for the processing unit voltage regulator. A voltage supply coupled to the control unit and to the processing unit voltage regulator is provided and is used for supplying the operating voltage for the processing unit wherein the operating voltage will have an upper and lower operating voltage level and an voltage supply operating range of approximately two to eighteen volts with relatively little variation in operating current.

US Patent:

6509825, Jan 21, 2003

Filed:

Sep 24, 1999

Appl. No.:

09/405451

Inventors:

Willem Smit - Chandler AZ
Pieter Schieke - Phoenix AZ
Willem J. Marneweck - Tempe AZ

Assignee:

Microchip Technology Incorporated - Chandler AZ

International Classification:

G05B 1900

US Classification:

340 52, 340 561, 340 104, 340 101, 3405725, 342 51, 235382

Abstract:

A radio frequency transponder device in an integrated circuit package requires only one dedicated pin for connection to a parallel resonant tuned circuit for receiving a remote signal. The one dedicated pin has a capacitor which blocks direct current (DC) flow and allows independent DC biasing of a radio frequency amplifier for increased signal amplification gain. Another package pin used for common power or ground connections supplies the second connection to the resonant tuned circuit. Multiple transponder inputs may be implemented in a single integrated circuit package using only one dedicated pin per input plus one common pin which may be used for another purpose, such as a power or a ground connection.

US Patent:

7158771, Jan 2, 2007

Filed:

Feb 3, 2003

Appl. No.:

10/358097

Inventors:

Willem Smit - Chandler AZ, US
Pieter Schieke - Phoenix AZ, US
Willem J. Marneweck - Gilbert AZ, US

Assignee:

Microchip Technology Incorporated - Chandler AZ

International Classification:

H04B 1/40

US Classification:

4552341, 4553431, 455291, 455292, 455341

Abstract:

A high gain input stage for a radio frequency transponder uses an amplifier for increasing a magnitude of an input signal. A DC bias circuit is used for controlling the operation of the amplifier. A resonant circuit is coupled between the amplifier and the DC bias circuit. The resonant circuit is used for receiving a signal generated by an electromagnetic field and for generating the input signal which is amplified by the amplifier. The resonant circuit has an inductor which is used to bias the amplifier thereby removing the need for a decoupling capacitor between the tuned circuit and the DC biasing of the amplifier. Multiple transponder inputs may be implemented in a single integrated circuit package.

US Patent:

20010010491, Aug 2, 2001

Filed:

Mar 5, 2001

Appl. No.:

09/799287

Inventors:

Willem Marneweck - Gilbert AZ, US
Johannes Van Niekerk - Tempe AZ, US

International Classification:

H04Q005/22
H04B001/16

US Classification:

340/010330, 455/343000

Abstract:

A signal discriminator for preventing activation by undesired signals of low power transponder circuits in a keyless entry system. These undesired signals may be noise or interfering signals. An asymmetrical low pass filter is used to determine the presence of a desired signal having a defined length of time. The asymmetrical filter has a longer charge time then discharge time, thereby being adapted to quickly discharge upon the loss of a signal. Signal duration verification is further used to determine if the desired signal is of a correct time duration.

US Patent:

20020175806, Nov 28, 2002

Filed:

May 25, 2001

Appl. No.:

09/866229

Inventors:

Willem Marneweck - Gilbert AZ, US
Stephanus Duvenhage - Phoenix AZ, US

International Classification:

H04Q005/22

US Classification:

340/010330, 340/010200, 340/010420

Abstract:

A system and method for identifying tags with a reader, wherein the tags have unique tag identification codes, having a transmitter of a wake-up signal from the reader to a tag within a field of the reader; a transmitter of a signal corresponding to an initial portion of the tag identification code from the tag to the reader; a transmitter of an initial acknowledgement signal responsive to the signal corresponding to the initial portion of the tag identification code; and a recorder in the reader of an initial portion of a tag confirmation code corresponding to the initial acknowledgement signal. The system send and acknowledges subsequent portions of the identification codes from the tags. If a tag does not receive an acknowledgement of its code, the tag becomes inactive. The system continues until only one tag remains active and transmits its entire code for acknowledgement. This tag is selected.

US Patent:

61669601, Dec 26, 2000

Filed:

Sep 24, 1999

Appl. No.:

9/405450

Inventors:

Willem J. Marneweck - Tempe AZ
Willem Smit - Chandler AZ
Meiling Chen - Tempe AZ

Assignee:

Microchip Technology, Incorporated - Chandler AZ

International Classification:

G11C 1604
G11C 1606

US Classification:

36518528

Abstract:

An electronic system, comprising a digital processor and an EEPROM, has circuit logic and program software or firmware for determining if a programming voltage level is sufficient for reliably programming the EEPROM. A charge pump is enabled and generates a voltage used for programming of the EEPROM. The enabled charge pump thereby loads a battery power supply. In addition, a test load may be connected to the output of the charge pump to simulate the EEPROM load during a programming operation to the EEPROM. The charge pump output voltage is measured to determine if at least a desired voltage value is obtained. Once the charge pump voltage level has been pre-qualified for the desired voltage value, an actual programming operation to the EEPROM may be performed. If the voltage level does not reach the desired value then a programming operation is inhibited and the electronic system may alarm or shut down operation. The charge pump voltage level is a good indication and measure of battery charge condition under actual EEPROM programming load conditions.