Abstract:
An apparatus for a Universal Serial Bus (USB) and wireless smart card is provided. The apparatus includes a mode detection circuit, a switching block, a controller, an antenna, and a wired interface. Furthermore, an apparatus for a triple-mode smart card is also provided herein. The apparatus for the triple mode smart card includes a mode detection circuit, a switching block, a controller, an antenna, and a wired interface. The apparatus for the triple mode smart card operates in one of a wireless mode, a USB mode and an International Standards Organization 7816 mode or other wired mode. Furthermore, the apparatus for any of these smart cards could operate in both the wireless and wired mode(s) without conflict, and without switching power off and on to change configuration.
Abstract:
A universal serial bus (USB) smart card can be automatically reset from a mute mode. A processor on the smart card writes its status to a status register. A USB device controller polls the status register to determine the status of the processor. If the status from the status register indicates that the processor has entered the mute mode, the USB device controller initiates generation of a reset signal to reset the processor out of the mute mode.
Abstract:
A fuse for an integrated circuit is constituted by a shallow NP junction, covered with a metal contact, the semiconductor region being not excessively doped. For the blowing of the fuse, the junction is forward biased with a current sufficient to enable a diffusion of metal up to the junction. This short-circuits the junction. The detection is done also by the forward biasing of the junction, but with a low current or a low voltage. The detection can also be done with reverse biasing.
Abstract:
A detection circuit that does not vary with the supply voltage is formed by measuring the voltage generated at the terminals of a diode (1) which is reverse biased and is supplied by a constant current generator (2). Furthermore, the generator (2) is improved by a current consumption limitation circuit (5). This circuit is particularly designed to be implanted in CMOS technology on the same substrate as a memory circuit or a microprocessor circuit.
Abstract:
A threshold temperature detection is made by measuring the reverse saturation current of a transistor subjected to the temperature to be measured. It is shown that, for temperatures close to the ambient temperature, the sensitivity of this detector is very high. Furthermore, in making a circuit that measures the relative variations of the reverse saturation current, a temperature detector is made which is independent of variations in characteristics resulting from manufacturng tolerances for integrated circuits. This circuit is particularly designed to be implanted in the same substrate as a memory circuit of the type with memory cells, provided with floating gate transistors.