Microchip Technology Inc.

Other

Overhead Door Corporation

Willem Jabcobus Marneweck

Willem Smit

Vivien Neil Delport

Pieter Schieke

Frederick J Bruwer

Dennis W Waggamon

Frederick Johannes Bruwer

Johannes Albertus Van Niekerk

Meiling Chen

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.

Integrated circuit transponder having a plurality of high-gain radio frequency signal inputs

A remote control system for opening and closing a barrier, such as a garage door, includes an RF receiver and a plurality of RF transmitters. The transmitters and receiver include circuitry programmed to provide transmission of encrypted code signals each time the transmitters are used and employing a code hopping method which prevents unauthorized signal interception or code &ldquo;grabbing&rdquo;. The system is operated in a code learning mode for the receiver by momentarily actuating a receiver learn mode button for receiving each transmitter identification code and a secret decryption key for that transmitter with the system automatically returning to the operate mode. Each transmitter identification and secret key code signal is automatically and randomly stored in an available and unused memory in the receiver circuitry. A multibit hopping code is transmitted from each transmitter to the receiver with each transmitter operation in the operate mode of the system and the hopping code changes with each transmission to prevent theft or code grabbing and resultant unauthorized operation of the system.

Remote controlled garage door opening system

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.

Integrated circuit device having a self-biased, single pin radio frequency signal input

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.

Processor having an extended operating voltage range

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.

Method, system and apparatus for determining that a programming voltage

A remote control system for opening and closing a barrier, such as a garage door, includes an RF receiver and a plurality of RF transmitters. The transmitters and receiver include circuitry programmed to provide transmission of encrypted code signals each time the transmitters are used and employing a code hopping method which prevents unauthorized signal interception or code 'grabbing'. The system is operated in a code learning mode for the receiver by momentarily actuating a receiver learn mode button for receiving each transmitter identification code and a secret decryption key for that transmitter with the system automatically returning to the operate mode. Each transmitter identification and secret key code signal is automatically and randomly stored in an available and unused memory in the receiver circuitry. A multibit hopping code is transmitted from each transmitter to the receiver with each transmitter operation in the operate mode of the system and the hopping code changes with each transmission to prevent theft or code grabbing and resultant unauthorized operation of the system.

Growing community of inventors

Tempe, AZ, United States of America

Willem Jabcobus Marneweck