US 11,852,694 B2
Circuitry for detecting jack plug insertion or removal
John A. Breslin, Edinburgh (GB); John B. Bowlerwell, Edinburgh (GB); and Clive R. Graham, Edinburgh (GB)
Assigned to Cirrus Logic Inc., Austin, TX (US)
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
Filed on Nov. 18, 2020, as Appl. No. 16/951,775.
Claims priority of provisional application 62/947,117, filed on Dec. 12, 2019.
Claims priority of provisional application 62/942,098, filed on Nov. 30, 2019.
Prior Publication US 2021/0165055 A1, Jun. 3, 2021
Int. Cl. G01R 31/69 (2020.01); H01R 13/66 (2006.01); H01R 24/58 (2011.01); H01R 107/00 (2006.01)
CPC G01R 31/69 (2020.01) [H01R 13/6683 (2013.01); H01R 24/58 (2013.01); H01R 2107/00 (2013.01)] 14 Claims
OG exemplary drawing
 
1. Circuitry for detecting connection of a plug of an audio accessory device to a socket of an intermediate cable that is connected to a host device, wherein the plug of the accessory device is of a different type than the socket of the intermediate cable, the circuitry comprising:
a monitoring unit comprising:
a first terminal configured to be electrically connected to a first socket contact of the socket that is in electrical contact with a first plug contact of the plug when the plug is fully received in the socket;
a second terminal configured to be electrically connected to a second socket contact of the socket that is in electrical contact with a second plug contact of the plug when the plug is fully received in the socket; and
a third terminal configured to be electrically connected to a third socket contact of the socket that is in electrical contact with a third plug contact of the plug when the plug is fully received in the socket,
wherein the monitoring unit is configured to:
detect a first impedance of a first signal path from the first terminal;
detect a second impedance of a second signal path from the first terminal; and
detect a third impedance of a third signal path from the second terminal,
wherein the circuitry is configured to output a signal indicative of detection of connection of the plug to the socket in response to detection by the monitoring unit that the detected first, second and third impedances do not correspond to expected first, second and third impedances,
wherein the second terminal is configured to act as an end point of the first signal path and wherein the third terminal is configured to act as an end point of the second and third signal paths.