Cirrus Logic Inc.

Akhilesh Persha

Eric B Smith

Vamsikrishna Parupalli

Nariankadu Datatreya Hemkumar

Younes Djadi

Sachin Deo

Mengde Wang

A system includes primary and secondary devices (e.g., camera controllers that drive voice coil motors) each having respective outputs and a communication link. The primary device includes first and second hardware timers, each of which expires at a time derived from a periodic control loop trigger. At first timer expiration, the primary transmits first updated values to the secondary. At second timer expiration, primary device hardware picks up and applies second updated values to the primary device outputs. In response to receiving the first updated values from the primary device, the secondary device applies the received first updated values to its outputs. The primary/secondary device combination provide a sufficient number of total outputs that they could not individually provide and further synchronize the outputs with small skew through the timers, which are programmable to also accommodate processing of inputs (e.g., from voice coil motor sensors) to compute the outputs.

System and method for providing increased number of time synchronized outputs by using communicating primary and secondary devices

A system may include a driver for driving an output signal to a load, a pre-driver for driving a pre-driver signal to the driver, the pre-driver having a variable drive strength, and a controller configured to control the variable drive strength based on at least one measured physical quantity to compensate for variation of an output signal edge rate due to variations in the at least one measured physical quantity.

Controlling edge rate of a switched output stage based on a measured physical quantity

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Austin, TX, United States of America

Akhilesh Persha