Active-Semi | Date: 2015-09-01
A current sense apparatus comprises a first switch having a first terminal connected to a power source and a second terminal connected to a battery, a second switch comprising a gate connected to a gate of the first switch and a first terminal connected to the first terminal of the first switch, a first operational amplifier having a first input connected to the second terminal of the first switch and a second input connected to a second terminal of the second switch, a second operational amplifier having an output connected to the gate of the first switch, a first input coupled to the first terminal of the first switch and a second input coupled to the second terminal of the first switch and a reference voltage source connected to one input of the second operational amplifier.
Active-Semi | Date: 2015-03-27
A programmable analog tile integrated circuit is configured over a standardized bus by communicating tile configuration information from a first integrated circuit tile, through a second integrated circuit tile, to a third integrated circuit tile. Each of the three integrated circuit tiles is part of an integrated circuit. The standardized bus is formed when the tiles are placed adjacent one another. Data bus and control signal conductors of the adjacent tiles line up and interconnect such that each signal conductor is electrically connected to every tile. Tile configuration information may be written to a selected register identified by an address in any selected one of the tiles using the data bus and control lines, regardless of the relative physical locations of the tile sending and the tile receiving the information. Thus, tile configuration information may pass from one tile to another tile, through any number of intermediate tiles.
Active-Semi | Date: 2015-04-30
A multi-state battery charger includes a single-stage AC-to-DC switching converter, where the single-stage converter receives an AC supply voltage and directly charges a rechargeable battery without there being any intervening second power stage. A novel battery charger controller integrated circuit in the converters secondary side detects profile selection resistor values, monitors battery voltage, monitors charging current, monitors battery temperature, controls a protection transistor, and sends a control signal back to a PWM in the primary side. The controller includes a flexible preprogrammed digital state machine circuit that is configured to control the converter from charging state to charging state so that the battery is charged in accordance with a selected one of multiple preprogrammed different multi-state battery charging profiles, where at least one of the profiles has at least one CC (constant current) state and one CV (constant voltage) state.
Active-Semi | Date: 2015-07-24
A system for authenticating a rechargeable battery and for detecting counterfeit batteries includes battery characteristics detection circuitry and a battery. Battery characteristics detection circuitry performs an authentication routine on the battery such that battery characteristics of the battery are measured. Battery characteristics include state of health, state of charge, internal resistance, relaxation time, and impedance. The battery is validated by comparing the battery characteristics to validation parameters provided by a manufacturer. If battery characteristics are within ranges of the validation parameters, then the battery is authenticated as originating from a particular manufacturer or batch. If validation fails, then the device is disabled or protected. In one example, validation parameters are stored and compared locally on a device. In another example, the device communicates battery characteristics to a remote entity that performs the validation. In another example, the device receives validation parameters from the remote entity and performs the validation locally.
Active-Semi | Date: 2015-01-30
A switching regulator having fast start-up time and low standby power is disclosed. In an exemplary embodiment, an apparatus includes a transistor that generates a charging current at a first current level from a base current received at a base terminal. The apparatus also includes a capacitor that charges in response to the charging current at the first current level to generate a voltage signal that increases at a first rate. The apparatus also includes a charge pump having an output coupled to the base terminal. The charge pump outputs a charge pump current when the voltage signal exceeds a first voltage level. The base current is increased by charge pump current to cause the transistor to generate the charging current at a second current level, and the capacitor charges in response to the charging current at the second current level to generate the voltage signal that increases at a second rate.
Active-Semi | Date: 2015-05-25
An adaptive USB port controller is disclosed. In an exemplary embodiment, a system comprises a source, a power adapter, a USB port controller, a USB plug and cable, and a device. In one example, the device includes a rechargeable battery. After connecting the device to the USB port controller via the USB plug and cable, a reconfigurable module within the USB port controller sets a power mode by: (1) configuring an impedance network to present impedance modes that indicate available power modes, (2) detecting voltages on one or more of the USB conductors in response to each impedance mode, and (3) comparing the detected voltages to reference voltage levels to set one of multiple power modes. The reconfigurable module then controls the power adapter to transfer power according to the determined power mode.
Active-Semi | Date: 2015-09-09
An integrated circuit (IC) and fabrication method thereof is provided that include the steps of specifying a plurality of required tile modules suitable for a particular end application, each of the modular tiles being configured to perform a predetermined function and constructed to have approximately the same length and width dimensions. The modular tiles are used to form the IC in a standard IC fabrication process. In many implementations, physical layout of the IC does not include the step of routing. Capabilities also include configuring the modular tiles to have programmable performance parameters and configuring the modular tiles to cooperate usefully with one another based on a programmable parameter.
Active-Semi | Date: 2015-10-13
A reversible buck or boost converter is operable in a buck mode and in a boost mode. In the buck mode, the converter receives a supply voltage via an input terminal and generates a charging current that is supplied to a battery, thereby charging the battery. The supply voltage is also supplied through the converter to an output terminal. In a boost mode, the converter receives power form the battery and generates a supply current and voltage that is output onto the output terminal. The same single current sense resistor is used both to control the charging current in the buck mode and to control a constant current supplied to the output terminal in the boost mode. The output current is controlled to be constant, regardless of changes in the in the battery voltage and changes in the output voltage.
Active-Semi | Date: 2015-05-05
Current metering for transitioning to low power operation in switching regulators is disclosed. In an exemplary embodiment, a method is provided that includes generating pulse width modulated charging cycles that enable current to flow to an inductor to adjust an output voltage, and detecting a skipped charging cycle. The method also includes determining whether a number of charging cycles are skipped over a time interval that begins when the skipped charging cycle is detected. The method also includes transitioning to a low power operating mode if it determined that the number of charging cycles have been skipped over the selected time interval. During the low power operating mode pulse frequency modulated charging cycles are generated that enable the current to flow to the inductor to generate the output voltage.
Active-Semi | Date: 2015-03-21
A packaged device includes a first die, a second die, and specially spaced and positioned sets of package terminals. The first die includes a pulse-width modulator (PWM), a processor, a timer, high-side drivers, low-side drivers, and a fault protection circuit. The second die includes ultra-high voltage high-side drivers. In an ultra-high voltage application, the PWM and external circuitry together form a switching power supply that generates a high voltage. The high voltage powers external high-side transistors. The processor and timer control the ultra-high voltage high-side drivers, that in turn supply drive signals to the external high-side transistors through the package terminals. External low-side transistors are driven directly by low-side drivers of the first die. If the fault protection circuit detects an excessive current, then the fault protection circuit supplies a disable signal to high-side and low-side drivers of both dice. The disable signal is generated without execution of processor instructions.