Maxim Integrated Patent Grants

Maintain power signature (MPS) powered device (PD)

Granted: August 15, 2017
Patent Number: 9735577
A Maintain Power Signature (MPS) Powered Device (PD) is described. In one or more implementations, the MPS device comprises a current sensor configured to sense current flowing from Power Sourcing Equipment (PSE) to the PD. The current sense based MPS device also comprises a current generator configured to sink electrical current to prevent the PSE from removing power to the PD. Thus, the electrical current comprises a current amplitude characteristic selected based upon MPS requirements…

Gamma switching amplifier

Granted: August 8, 2017
Patent Number: 9728155
Electronic devices with displays are configured to provide a gamma correction signal to each source driver chip driving the display. The gamma correction signal is supplied by a gamma application circuit coupled to each source driver chip. The gamma application circuit includes a switching amplifier configured to output a switching waveform and a filter to input the switching waveform and output the gamma correction signal to an input of each source driver chip. The switching amplifier…

Powered device having semi-active bridge

Granted: August 8, 2017
Patent Number: 9729081
A semi-active bridge for furnishing voltage of a correct polarity to a powered device in a Power over Ethernet (PoE) network is disclosed. In one or more implementations, the semi-active bridge includes a diode having an anode portion and a cathode portion. The anode portion of the diode is connected to an input terminal, and the cathode portion of the diode is connected to an output terminal. The semi-active bridge also includes an active transistor device having a source region and a…

Method and battery pack device with antenna and diode

Granted: August 1, 2017
Patent Number: 9721085
A device and system are described that include an authentication device having a battery, at least one battery contact, an antenna, at least one antenna contact, a ferrite material barrier, a diode electrically coupled to a battery contact and an antenna contact, and an authenticator coupled to the diode, a battery contact, and an antenna contact. A system includes the device with an authentication device, a transceiver electrically coupled to a near field communication contact, a switch…

Wafer-level chip-scale package device having bump assemblies configured to furnish shock absorber functionality

Granted: August 1, 2017
Patent Number: 9721912
Semiconductor devices are described that have bump assemblies configured to furnish shock absorber functionality. In an implementation, a wafer-levelchip-scale package devices include an integrated circuit chip having an array of bump assemblies disposed over the integrated circuit chip. The array of bump assemblies comprises a plurality of first bump assemblies that include solder bumps composed at least substantially of a solder composition (i.e., solder bumps that do not include a…

Method for detecting a fault condition of an operational amplifier

Granted: July 25, 2017
Patent Number: 9714971
A method for detecting a fault condition of an operational amplifier of an integrated circuit during operation includes operating an integrated circuit which includes an operational amplifier (op-amp) having a V+ input, a V? input and an op-amp output and an on-line fault detector electrically coupled to the V+ input and the V? input of the op-amp of the on-line fault detector, monitoring an operation of the op-amp with the on-line fault detector, and developing a fault signal at a fault…

Integrated standard-compliant data acquisition device

Granted: July 25, 2017
Patent Number: 9716520
An integrated standard-compliant data acquisition device includes an electrically insulating package including a plurality of conductive leads and an integrated circuit (IC) disposed within the electrically insulating package and electrically coupled to at least some of the plurality of conductive leads. The IC includes a first multiplexer (MUX), a second MUX, a third MUX, an analog-to-digital converter (ADC), a plurality of registers, a fourth MUX, control logic, and communication…

Systems and methods for operating secure elliptic curve cryptosystems

Granted: July 25, 2017
Patent Number: 9716584
Various embodiments of the invention implement countermeasures designed to withstand attacks by potential intruders who seek partial or full retrieval of elliptic curve secrets by using known methods that exploit system vulnerabilities, including elliptic operation differentiation, dummy operation detection, lattice attacks, and first real operation detection. Various embodiments of the invention provide resistance against side-channel attacks, such as sample power analysis, caused by…

Time of arrival delay cancellations

Granted: July 11, 2017
Patent Number: 9702970
The invention relates to a ranging system for measuring the distance between an interrogator and a transponder. The transponder includes: a signal receiver for receiving a challenge signal from an interrogator; a signal processor for processing the challenge signal and generating a response signal in response to the challenge signal; a buffer for storing the response signal generated by the signal processor; and a signal transmitter for sending the response signal stored in the buffer…

Always-on low-power keyword spotting

Granted: July 11, 2017
Patent Number: 9703350
The invention relates to an electronic device that includes a wake-up system that operates at a substantially low power level and is applied to wake up the electronic device from a sleep mode. The wake-up system comprises a sound transducer that converts a received sound signal to an electrical signal and a keyword detection logic that preliminarily identifies a speech energy profile that corresponds to at least one of a plurality of keywords in a part of the electrical signal. In some…

Fan-out and heterogeneous packaging of electronic components

Granted: July 11, 2017
Patent Number: 9704809
Aspects of the disclosure pertain to a packaging structure configured for providing heterogeneous packaging of electronic components and a process for making same. The packaging structure includes a carrier substrate having a plurality of cavities formed therein. The packaging structure further includes a first die and a second die. The first die is at least substantially contained within a first cavity included in the plurality of cavities. The second die is at least substantially…

Systems and methods for enhancing confidentiality via logic gate encryption

Granted: July 11, 2017
Patent Number: 9705501
Presented are systems and methods that allow hardware designers to protect valuable IP and information in the hardware domain in order to increase overall system security. In various embodiments of the invention this is accomplished by configuring logic gates of existing logic circuitry based on a key input. In certain embodiments, a logic function provides results that are dependent not only on input values but also on an encrypted logic key that determines connections for a given logic…

Systems and methods for discharging inductors with temperature protection

Granted: June 6, 2017
Patent Number: 9673007
An integrated circuit for demagnetizing an inductive load includes a first switch to control current supplied by a voltage supply to the inductive load. A Zener diode includes an anode connected to a control terminal of the first switch and a cathode connected to the voltage supply. A second switch includes a control terminal and first and second terminals. A temperature sensing circuit is configured to sense a temperature of the first switch and to generate a sensed temperature. A…

Vertical semiconductor device having frontside interconnections

Granted: June 6, 2017
Patent Number: 9673316
A semiconductor device including a VDMOS device formed therein includes a terminal, or contact, to the drain region of the VDMOS device from the frontside of the device. In one or more implementations, a semiconductor device includes a semiconductor substrate having a first surface and a second surface and a vertical diffused metal-oxide-semiconductor device formed within the semiconductor substrate. The vertical diffused metal-oxide-semiconductor device includes at least one source…

Power over ethernet powered device interface with non-power over ethernet supply detection

Granted: May 30, 2017
Patent Number: 9665151
A method for detecting and classifying powered devices in power over Ethernet/non-power over Ethernet applications is described. In one or more implementations, the method includes deactivating a non-power over Ethernet component for a predetermined time period. The method also includes activating an isolation switch of a powered device after the predetermined time period has elapsed since no characteristic impedance associated with the powered device has been detected.

Detecting pressure exerted on a touch surface and providing feedback

Granted: May 30, 2017
Patent Number: 9665213
A system includes a sensor device configured to detect a touch pressure dependent characteristic of a body part of a user while the user touches a touch surface with the body part. The system also includes an image capture device configured to capture an image of the body part of the user while the user touches the touch surface. The system further includes a processor configured to associate the image with an amount of pressure exerted on the touch surface by the user. The processor is…

Daisy chain configuration for power converters

Granted: May 30, 2017
Patent Number: 9667064
A system includes a plurality of power supplies and a controller. The plurality of power supplies outputs power to a load. A serial bus connects the plurality of power supplies in a daisy chain. The controller is connected to first and last ones of the power supplies by the serial bus. The controller is connected to a management bus via a management bus interface. The controller monitors the plurality of power supplies via the serial bus. The controller transmits status information of…

One wire parasite power switch control circuit

Granted: May 23, 2017
Patent Number: 9660638
A power switch control circuit is provided for power management in one-wire application. The circuit comprises a controllable switch coupled between an input node and an internal power node. A comparator is utilized for power loss sensing to close the switch when necessary to minimize the power loss while the input is low or floating. A watchdog circuit is incorporated within the control circuit to pull down the input node periodically to detect small leakage current when the input node…

Piezo driver having passive energy storage component recharging capability

Granted: May 16, 2017
Patent Number: 9652013
A piezo driver is described that is configured to furnish electric charge to a piezo component during a first operational state and configured to transfer electric charge from the piezo component to a passive energy storage component during a second operational state. In one or more implementations, the piezo driver includes a passive energy storage component configured to store electric charge. The piezo driver also includes a voltage converter configured to electrically connect between…

Multi-level step-up converter topologies, control and soft start systems and methods

Granted: May 16, 2017
Patent Number: 9653986
A multi-level, step-up converter circuit includes an inductor including one terminal in communication with an input voltage supply. N transistor pairs are connected in series, where N is an integer greater than one. First and second transistors of a first pair of the N transistor pairs are connected together at a node. The node is in communication with another terminal of the inductor. Third and fourth transistors of a second pair of the N transistor pairs are connected to the first and…