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Single wire serial interface

  • US 9,265,113 B2
  • Filed: 10/15/2014
  • Issued: 02/16/2016
  • Est. Priority Date: 03/28/2002
  • Status: Expired due to Fees
First Claim
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1. A power integrated circuit device having at least one input and at least one output, comprising:

  • a core circuit that produces the at least one output of the power integrated circuit; and

    an interface in communication with the core circuit, the interface including (i) counter circuitry that generates a count value based on pulses encoded in an input signal received via a single input of the power integrated circuit, (ii) latch driver circuitry that asserts a latch signal when the input signal is maintained high for a period that exceeds a predetermined latch timeout value, (iii) a latch that stores the count value based on the latch signal being asserted, (iv) decoder circuitry that associates the count value in the latch with a corresponding lighting control state that is communicated to a light source via the at least one output, and (v) sensing circuitry that determines whether the input signal is high or low so that the count value is maintained while the input signal is high, and the count value is reset in response to the input signal being low for a period that exceeds a predetermined timeout value, the predetermined timeout value being longer than a width of one of the pulses.

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