US 12,101,097 B2
Coulomb counter circuitry
Paul Wilson, Linlithgow (GB); James T. Deas, Edinburgh (GB); Mucahit Kozak, Austin, TX (US); and Graeme G. Mackay, Austin, TX (US)
Assigned to Cirrus Logic Inc., Austin, TX (US)
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
Filed on Nov. 15, 2022, as Appl. No. 17/987,448.
Claims priority of provisional application 63/286,239, filed on Dec. 6, 2021.
Prior Publication US 2023/0179217 A1, Jun. 8, 2023
Int. Cl. H03M 1/10 (2006.01); H03M 1/06 (2006.01)
CPC H03M 1/1023 (2013.01) [H03M 1/0609 (2013.01)] 21 Claims
OG exemplary drawing
 
1. Coulomb counter circuitry operable in a first mode of operation and a second mode of operation, the coulomb counter circuitry comprising:
first analog to digital converter (ADC) circuitry configured to generate a first ADC output signal indicative of a current through a load coupled to the coulomb counter circuitry;
second analog to digital converter (ADC) circuitry;
offset correction circuitry; and
accumulator circuitry configured to generate a signal indicative of a cumulative amount of charge transferred to the load,
wherein in the second mode of operation, the coulomb counter circuitry is operable to enable the second ADC circuitry and to generate an offset correction factor based at least in part on a second ADC output signal output by the second ADC circuitry, and
wherein in subsequent operation of the coulomb counter circuitry in the first mode of operation, the offset correction circuitry applies the offset correction factor to the first ADC output signal.