Maxim Integrated Products, Inc.

Kenneth Jay Helfrich

Leonardo Sala

Sang Hoon Kim

Larry Barnes

Fabrizio Fraternali

Lane Thomas Hauck

Arman Hematy

David Alan Podsiadlo

Danilo Ranieri

An apparatus including a handshake window enabler having a pair of differential inputs and a window enablement output, a common mode detector coupled to a power input and a ground input and having a handshake inhibit output, and a handshake disabler coupled to the handshake window enabler, the common mode detector, and the pair of differential inputs. If a common mode voltage that out of range ('too high') is detected, high speed handshake protocols are such that the bus operates a lower data rate.

Method and apparatus for disabling high speed bus operation under high common mode voltage conditions

A method for using driver circuitry to drive a load having an unknown impedance magnitude includes (a) in a configuration mode of the driver circuitry, determining a required power supply voltage for a driver stage to drive the load, and (b) in a driving mode of the driver circuitry, (1) driving the load via the driver stage in response to an input signal, and (2) controlling a power supply to provide the required power supply voltage to the driver stage as a static voltage, while driving the load via the driver stage in response to the input signal.

Driver circuitry and associated methods

A method for providing power through a USB port of an electronic device includes connecting a power supply to a USB port of an electronic device, emulating a personal computer (PC) host system such that the electronic device believes that the power supply is a PC host system, retrieving at least one descriptor from the electronic device, identifying the electronic device from the at least one descriptor, and setting a charging voltage based upon the identity of the electronic device.

Method for providing power to an electronic device

A method for accessory management and data communication between a portable electronic device and an accessory via audio port is disclosed. The method involves using a microphone line of the accessory in different communication modes including a MIC data mode and a power mode. In the MIC data mode, the MIC line disconnects from a microphone load to operate on a voltage above a predetermined threshold whenever the accessory needs to communicate with the host electronic device. In the MIC power mode, the MIC line connects with the microphone load for the normal operation of the microphone.

Accessory management and data communication using audio port

A universal serial bus (USB) hub includes a USB AFE circuit module, a hub core and an isolator circuit module interposed between the USB AFE circuit module and the hub core. Data communications between the hub core and the first USB AFE circuit module pass through the isolator circuit module. A method for communicating through a universal serial bus hub includes providing a USB AFE circuit module, providing a hub core, providing an isolator circuit module interposed between the USB AFE circuit module and the hub core, and directing communication from the USB AFE circuit module to the hub core through the isolator circuit module.

USB hubs with galvanic isolation

In an example embodiment a headset includes a phone jack, a speaker connected to the phone jack, a microphone coupled to the phone jack and a resistive switch string coupled to the phone jack to the same ring of the phone jack as the microphone. In another example an integrated circuit device includes a charge pump, a multi-voltage LDO having an input which is capable of being coupled to an output of the charge pump, an ADC; and a pull-up resistor coupled between an output of the LDO and an input of the ADC. In another example embodiment, a method for headset signal multiplexing includes providing a headset with a plurality of signal sources and voltage division multiplexing the plurality of signal sources on a common wire.

Headset with microphone and wired remote control

In an embodiment, set forth by way of example and not limitation a USB power converter for an electronic device includes a USB bus including VBUS power line, a D&#x2212; data line and a D+ data line, a variable voltage converter, a processor clock, a USB transceiver coupled to the D&#x2212; data line and the D+ data line, and a processor coupled to processor clock and to the USB transceiver. Preferably, the variable voltage converter has an alternating current (AC) input, a direct current (DC) output coupled to the VBUS power line, and a voltage control input responsive to a voltage control signal to provide a plurality of voltage levels at the DC output. The process is, in this example embodiment, operative to develop the control signal based upon communication from an electronic device connected to the USB bus. In a non-limiting embodiment, the USB power converter further includes a host ID controller having a host ID control input coupled to the processor, the host ID controller selectively coupled to the D&#x2212; data line and the D+ data line in response to a host ID control signal developed by the processor.

Method and apparatus for providing power to an electronic device

A communication interface hub includes multiple ports, where one of the ports is an upstream port operative to be in direct and/or indirect communication with a host and at least one other of the ports is a downstream port operative to be in direct and/or indirect communication with at least one device. At least one hub core is coupled to the ports and implements at least one physical hub, and at least one virtual hub core is coupled to the ports and implements at least one virtual hub. The virtual hub is detectable as at least one physical hub by the host to cause the host to allocate an additional time delay in waiting for responses to signals output by the host.

Virtual hubs for communication interface

An apparatus for remote wake-up during dedicated charging mode includes: a USB transceiver port; a USB connector port; a switch network coupling the USB transceiver port to the USB connector port; and control logic coupled to the switch network and operative to control the switch network to disconnect the USB transceiver port from the USB connector port during a dedicated charger operational mode and to connect the USB transceiver port to the USB connector port upon the detection of a potential remote wake-up condition.

Apparatus for remote wake-up during dedicated charging mode

In an embodiment, an analog front end (AFE) bridge for a SLPI PHY includes: an AFE LINK-side circuit having at least one pair of differential LINK-side nodes which does not conform to SLPI PHY specifications; an AFE PHY-side circuit having a pair of differential PHY-side nodes conforming to SLPI PHY specifications, wherein the AFE PHY-side circuit is coupled to the AFE LINK-side circuit; and a termination control circuit coupled to the AFE PHY-side circuit. A method of bridging a legacy LINK circuit to a SLPI PHY circuit includes: communicating with a legacy LINK circuit with a legacy LINK protocol; communicating with a SLPI PHY circuit with a SLPY PHY protocol over a differential pair; converting outputs of the legacy LINK circuit into inputs of the SLPI PHY circuit; converting outputs of the SLPI PHY circuit into inputs of the legacy LINK circuit; controlling a termination of the differential pair.

Analog front end protocol converter/adapter for SLPI protocol

A cable detection circuit for a device, set forth by way of example and not limitation, includes a generator circuit operative to provide currents on a line of a communication interface. A controller is coupled to the generator circuit and operative to detect an amount of capacitance on the line based on the provided currents. The controller is operative provide an output based on the detected amount of capacitance, the output indicating whether a cable is connected to the device via the communication interface.

Cable connection detection for electronic devices

In an embodiment, set forth by way of example and not limitation, a USB dedicated charger identification circuit includes a USB D+ port, a USB D&#x2212; port, a first circuit conforming to a first identification protocol, a second circuit conforming to a second identification protocol, and logic selectively coupling one of the first circuit and the second circuit to the USB D+ port and the USB D&#x2212; port. In an alternate embodiment set forth by way of example and not limitation, a method to provide USB charger identification includes providing a first USB charger identification at a USB D+ port and a D&#x2212; port, Next, it is detected if the first USB charger identification was inappropriate. Then, if the first USB charger identification was inappropriate, a second USB charger identification is provided at the USB D+ port and the D&#x2212; port.

USB dedicated charger identification circuit

In an embodiment, set forth by way of example and not limitation, a USB dedicated charger identification circuit includes a USB D+ port, a USB D&#x2212; port, a first circuit conforming to a first identification protocol, a second circuit conforming to a second identification protocol, and logic selectively coupling one of the first circuit and the second circuit to the USB D+ port and the USB D&#x2212; port. In an alternate embodiment set forth by way of example and not limitation, a method to provide USB charger identification includes providing a first USB charger identification at a USB D+ port and a D&#x2212; port. Next, it is detected if the first USB charger identification was inappropriate. Then, if the first USB charger identification was inappropriate, a second USB charger identification is provided at the USB D+ port and the D&#x2212; port.

Growing community of inventors

Duluth, GA, United States of America

Kenneth Jay Helfrich