Atmel Nantes Sa

Philippe Messager

Sébastien Faivre

A voltage regulator system is provided, which receives a first voltage and produces a regulated voltage. Such a device does not include any transistor supporting the first voltage, but does include transistors supporting at most a second voltage lower than the first voltage and includes division means, which include a first transistor connected in series with at least one second transistor, which division means receive the first voltage and generate the regulated voltage.

High-voltage regulator system compatible with low-voltage technologies and corresponding electronic circuit

A device for converting a continuous supply voltage into a continuous output voltage includes at least one inductor accumulating energy during an accumulation time and delivering said accumulated energy during a discharge time, so that said output voltage has a value that is greater than or equal to that of said supply voltage. An oscillator controls said accumulation and discharge times, in which a period is equal to a sum of said accumulation time and said discharge time and a cyclic ratio is equal to the ratio of said accumulation time to said period. The oscillator includes a mechanism for controlling said period and said cyclic ratio according to said supply voltage and said output voltage.

Device for converting a continuous supply voltage into a continuous output voltage and corresponding electronic circuit

A device is provided for resetting an integrated circuit generating a reset signal after a power supply voltage drop to a very low level has been detected. Such a device includes at least one control means, the state of which (conducting or non-conducting) is controlled by a control voltage equal to the difference between the power supply voltage and a predetermined offset voltage, such that if the control voltage is less than or equal to a threshold, the control means authorizes activation of the means for generating a reset signal.

Power failure detection circuit with fast drop response

The invention concerns a microelectronic circuit for activation or respectively deactivating at least one second input/output (), or second 'buffer', which receives a deactivation command () corresponding to a combination of a general activation, or respectively deactivation, command (StopPadB) and of an information item representing the activated, or respectively deactivated, state () of at least a first buffer, so that the said second buffer(s) is/are only activated, or respectively deactivated, when the said first buffer(s) is/are already activated, or respectively deactivated, to keep to a predetermined sequence of activation, or respectively deactivation, of the said buffers ().

Microelectronic circuit for activation or deactivation of at least one input/output, corresponding smart card reader and deactivation method

The invention concerns a detector of overloads for DCDC converters, the said converter supplying a load current with an output voltage (Vout) that may be different from a supply voltage (Vbat), by means of an inductance (L) and a first transistor (TP), made conductive or blocked by regulation devices depending on the quantity of current demanded by the said load, the said detector having a means of capturing an image of the said load current at a predetermined smaller scale, and also a means of analysis that takes into account the said load current image to provide overload information when the said quantity of current is higher than a predetermined current threshold.

DCDC voltage converter overload detector, and corresponding component and device

The invention concerns an integrated circuit comprising means of delivering, on at least one output, a predetermined output voltage representative of a logic level, means of distributing a mains voltage and means of generating an internal voltage reference lower than the mains voltage, comprising means of connecting the mains voltage to the output and means of limiting and/or detecting the voltage at the output at the predetermined output voltage value, taking into account the reference voltage.

Integrated circuit delivering logic levels at a voltage independent from the mains voltage, with no attached regulator for the power section, and corresponding communication module

A power supply controller for electronic circuits, supplying a power supply voltage (VDC) and preventing operation of the said circuit by using a RESET signal when the said power supply voltage is less than a first predetermined threshold. The controller includes a first comparator (C ) comparing a voltage proportional to the power supply voltage with a reference voltage and activating the reset signal when the voltage proportional to the power supply voltage is less than the reference voltage. A bandgap module supplies a principal reference voltage (VBGAP). Preliminary reference devices immediately supply a preliminary reference voltage (V ), less than the principal reference voltage. Control circuits receive the preliminary reference voltage (V ) and the principal reference voltage (VBGAP) and automatically activate the RESET signal for as long as the principal reference voltage (VBGAP) has not reached a second predetermined threshold.

Power supply controller for electronic circuits, components and corresponding devices

A device generating a precise reference voltage. This device comprises a semiconductor circuit ( ) of &ldquo;bandgap&rdquo; type delivering a reference voltage (Vref) and a multiplier circuit ( ) delivering an output voltage (V ) from the reference voltage. A galvanic link ( ) makes it possible to supply the semiconductor circuit ( ) from the precise reference voltage, and an initialization circuit ( ) makes it possible, on initialization, to replace this precise reference voltage with the build-up voltage of the supply voltage. Application to reference voltage generating circuits of analogue/digital converter circuits in CMOS technology.

Device generating a precise reference voltage

Slaved supply for serial link, of master slave type

A device for generating a low-consumption controlling analogue voltage of stable value adapted for controlling LCD display segments that comprises an input circuit receiving an analogue voltage of given nominal value adapted to generate a picture analogue voltage of reduced value in a ratio k. A driver circuit is provided to receive the picture analogue voltage as a reference signal and a picture signal derived and reduced in the same ratio k from the low-consumption analogue voltage and comprises a differential amplifier supplied with a first and a second constant voltage value for outputting a first and a second switch control pulse. A switching circuit comprising a first switching branch outputting an amplified auxiliary switch control pulse synchronous with the reference signal and a second switching branch controlled by the amplified auxiliary switch control pulse is adapted to outputting the low-consumption analogue voltage switched to the analogue voltage of given value.

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Nantes, France

Philippe Messager