Moisture ingress sensors
    11.
    发明授权

    公开(公告)号:US09752999B2

    公开(公告)日:2017-09-05

    申请号:US14290866

    申请日:2014-05-29

    Applicant: Apple Inc.

    CPC classification number: G01N27/048 G01N27/121 H02H5/083

    Abstract: This application relates to a moisture ingress sensor. In particular, this application relates to a moisture ingress sensor that can detect liquid ingress into an electronic device. The moisture ingress sensor can include a resistor, an N-channel MOSFET, an operation amplifier, comparators, and an AND logic gate. The moisture ingress sensor is configured to provide a lower power means for accurately detecting moisture in an electronic device. Multiple areas of the electronic device can include the moisture ingress sensor in order to optimize the detection of moisture for at a variety of regions of the electronic device. Additionally, the electronic device can record signals from the moisture ingress sensor and shut down components of the electronic device that could be affected by the detected moisture. Furthermore, the moisture ingress sensor can be tuned to detect one or more types of liquids.

    Closed Loop Headroom Management For Battery Charging

    公开(公告)号:US20210126470A1

    公开(公告)日:2021-04-29

    申请号:US16664274

    申请日:2019-10-25

    Applicant: Apple Inc.

    Abstract: An electronic system can include a charged system and a charging system. The charged system can include a charger and a battery configured to be charged thereby. The charger may be configured to receive power from a charging system that includes a power converter configured to supply power to the charger and a controller configured to control the power converter. The controller may be configured to receive feedback information from the charged system, including one or more voltages. The controller may be further configured to determine an output voltage compensation value for the power converter as a function of the feedback information and to set an output voltage of the power converter as a function of the compensation value. The compensation value and output voltage may be selected to maintain a preselected headroom between a battery charging target voltage of the charger and a voltage supplied to the charger.

    Methods and apparatus for multi-drop digital bus

    公开(公告)号:US10102175B2

    公开(公告)日:2018-10-16

    申请号:US14216370

    申请日:2014-03-17

    Applicant: Apple Inc.

    Abstract: Apparatus and methods for digital bus operation. In one embodiment, the digital bus is a bidirectional, time-division multiplexing (TDM) audio bus operation, and a bus technology is described that enables multi-drop (e.g., multiple device, multiple node, etc.) connectivity for real-time audio over a small form factor interface (e.g., as few as two (2) wires). Specifically, an exemplary tri-level signaling scheme provides bidirectional functionality, real-time clock edges, audio data, in a multi-drop topology in one implementation.

    Methods and apparatus for equalization of a high speed serial bus

    公开(公告)号:US10002101B2

    公开(公告)日:2018-06-19

    申请号:US14641170

    申请日:2015-03-06

    Applicant: Apple Inc.

    CPC classification number: G06F13/4282 G06F1/3287 G06F13/4022

    Abstract: Methods and apparatus for equalization of a high speed serial bus. A well-tuned passive equalization circuit for use with high frequency differential signals suffer from e.g., impedance mismatches, impedance discontinuities (e.g., connectors, etc.). In one embodiment, a shunting circuit is inserted between the differential terminals of a Universal Serial Bus (USB) cable, connector, etc. The shunting circuit is configured to “open” at low frequencies to enable Full Speed (FS) enumeration, while also providing sufficiently high impedance at high frequencies to enable High Speed (HS) operation. In one such implementation, the shunting circuit includes a tuned resistor, capacitor, inductor, and switch element arranged in series.

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