Abstract:
Un procedimiento de detección de humo, que comprende las etapas de: acoplar una cámara (102) de ionización con un módulo (208) de detección capacitiva (CSM); determinar un cambio en una capacitancia de la cámara (102) de ionización utilizando el CSM (208): determinando un primer cambio en la capacitancia de la cámara (102) de ionización cuando la cámara (102) de ionización se encuentra en una primera polaridad; determinando un segundo cambio en la capacitancia de la cámara (102) de ionización cuando la cámara (102) de ionización se encuentra en una segunda polaridad; determinando una diferencia entre el primer cambio y el segundo cambio; y utilizar la diferencia para determinar el cambio en la capacitancia de la cámara (102) de ionización; y detectar la presencia de humo detectando un cambio predeterminado en la capacitancia.
Abstract:
Un procedimiento de detección de humo, que comprende las etapas de: acoplar una cámara (102) de ionización a un circuito (208) divisor de tensión capacitivo (CVD); determinar un cambio en una capacitancia de la cámara (102) de ionización utilizando el circuito (208) CVD mediante: la determinación de un primer cambio en la capacitancia de la cámara (102) de ionización cuando la cámara (102) de ionización está a una primera polaridad; la determinación de un segundo cambio en la capacitancia de la cámara (102) de ionización cuando la cámara (102) de ionización está a una segunda polaridad; la determinación de una diferencia entre el primer cambio y el segundo cambio; y la utilización de la diferencia para determinar el cambio en la capacitancia de la cámara (102) de ionización; y detectar la presencia de humo mediante la detección de un cambio predeterminado en la capacitancia.
Abstract:
A microcontroller having digital to frequency converter and pulse frequency modulator capabilities. The digital to frequency converter (DFC) generates a 50 percent duty cycle square wave signal that may be varied in frequency, wherein the 50 percent duty cycle square wave signal is directly proportional and linear with a count value put into an increment register. The pulse to frequency modulator (PFM) generates pulses having pulse widths of the input clock for each rollover of a counter. The frequency of these pulses is directly proportional and linear with the count value put into the increment register.
Abstract:
A light emitting diode (LED) is driven with a plurality of pulses having controllable pulse widths and positions within clock time periods that provide for both LED light intensity control and digital information communications from a single output node of an integrated circuit (IC) device. The LED light intensity is determined by the duty cycle of the pulses where the human eye integrates these light pulses from the LED into continuous light intensity levels. The digital information contained in the light output from the LED is detected by a photo-detector that converts the light pulses into electric signals that are demodulated and read by a circuit debugger and/or manufacturing test station. The aforementioned operations allow continuous visual display and data transmission using only one output node of the IC device. This is especially advantageous when using low pin count IC devices.
Abstract:
An ion chamber provides a current representative of its characteristics as affected by external conditions, e.g., clean air or smoke. A direct current (DC) voltage is applied to the ion chamber at a first polarity and the resulting current through the ion chamber and parasitic leakage current is measured at the first polarity, then the DC voltage is applied to the ion chamber at a second polarity opposite the first polarity, and the resulting current through the ion chamber and parasitic leakage current is measured at the second polarity. Since substantially no current flows through the ion chamber at the second polarity, the common mode parasitic leakage current contribution may be removed from the total current measurement by subtracting the current measured at the second polarity from the current measured at the first polarity, resulting in just the current through the ion chamber.
Abstract:
An instruction set for a microcontroller with a data memory divided into a plurality of memory banks wherein the data memory has more than one memory bank of the plurality of memory banks that form a block of linear data memory to which no special function registers are mapped, a bank select register which is not mapped to the data memory for selecting a memory bank, and with an indirect access register mapped to at least one memory bank, wherein the instruction set includes a plurality of instructions operable to directly address all memory locations within a selected bank, at least one instruction that provides access to the bank select register, and at least one instruction performing an indirect address to the data memory using the indirect access register.