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Battery monitoring circuit

  • US 9,075,090 B2
  • Filed: 01/25/2012
  • Issued: 07/07/2015
  • Est. Priority Date: 08/11/2011
  • Status: Active Grant
First Claim
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1. A battery monitoring circuit, comprising:

  • a high counter that increments when a sense voltage measurement is above a threshold;

    a low counter that increments when the sense voltage measurement is below the threshold;

    state machine circuitry coupled to the high counter and to the low counter;

    open circuit voltage monitoring circuitry coupled to the state machine circuitry; and

    resistance monitoring circuitry coupled to the state machine circuitry;

    wherein the state machine circuitry transitions from a low-load state to a high-load state when the high counter reaches a first high counter limit; and

    wherein the state machine circuitry transitions from the high-load state to the low-load state when the low counter reaches a second low counter limit.

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