Motorola Corporation

Charles E Browder

Hung Q Vuong

Shuyong Shao

Timothy R Houston

Christine Purcell

Carlos A Garrafa

A cable area network (CAN) bus termination () is provided by an interfaceoperably coupling a cable detection input pin (), a switch () and a termination resistance () to detect the presence and absence of one or more cables (). The termination resistance () is automatically enabled to create terminations at end nodes and is automatically disabled to provide a daisy-chain connection between interim nodes of a multi-cable system.

Method and apparatus for CAN bus auto-termination

An automatic digital level control adjuster (,) processes an analog input signal (,) to adjust its signal level, based on input (,) from a digital module (,) that is clocked by a clock signal (,) derived from the analog signal (,). Preferably, the input (,) from the digital module (,) changes at a rate dependent on the clock signal (,), and such changes are made during crossovers of the analog signal across a predetermined zero reference threshold.

Self-clocking automatic digital level control method and apparatus

A bi-directional voltage translator (125) has a first port (201) that communicates a signal at a first voltage level, and second port (202) that communicates a signal at a second voltage level different from the first voltage level. A switching circuit, including a bipolar junction transistor (210) and a switch (220), couples both ports (201, 202). The transistor (210) has a collector (211) coupled, via a pull-up circuit (206), to a voltage source corresponding to the first voltage level, and to the first port (201), and an emitter (212) coupled to the second port. The base (213) of the transistor (210) is coupled, via a pull-up circuit (207), to a voltage source corresponding to the second voltage level. Preferably, the switch (220) is Schottky diode or other diode having a forward voltage drop.

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Boca Roton, FL, United States of America

Charles E Browder