Allegro MicroSystems Inc.'sA1356 is a high precision, user programmable, Hall-effect linear
sensor with a pulse width modulated (PWM), open collector output. The duty
cycle (DC) of the PWM output signal (freq: 2 kHz) is proportional to an
applied magnetic field. The A1356 device converts an analog signal from its
internal Hall sensor element to a digitally encoded PWM output signal.
The BiCMOS, monolithic circuit inside of the A1356
integrates a Hall element, precision temperature-compensating circuitry to
reduce the intrinsic sensitivity and offset drift of the Hall element, a
small-signal high-gain amplifier, proprietary dynamic offset cancellation
circuits and PWM conversion circuitry. The dynamic offset cancellation circuits
reduce the residual offset voltage of the Hall element, which is normally
caused by device over molding, temperature dependencies and thermal stress. The
high-frequency offset cancellation (chopping) clock allows for a greater
sampling rate, which increases the accuracy of the output signal and results in
faster signal processing capability.
The design and manufacturing flexibility of the A1356
is realized through user programmable: gain, quiescent duty cycle and carrier
frequency. The device can be set up in a magnetic circuit and programmed with a
train of serial pulses. Once the appropriate parameters have been selected, the
codes can be locked for one-time programming. In this manner, manufacturing
tolerances can be reduced and the assembly process can be simplified.
The A1356 sensor is provided in a lead (Pb) free,
3-pin, single inline package (KB suffix), with 100 percent matte tin lead frame
plating. It is priced at $1.45 in quantities of 1,000.
Samsung's Galaxy line of smartphones used to fare quite well in the repairability department, but last year's flagship S5 model took a tumble, scoring a meh-inducing 5/10. Will the newly redesigned S6 lead us back into star-studded territory, or will we sink further into the depths of a repairability black hole?
In 2003, the world contained just over 500 million Internet-connected devices. By 2010, this figure had risen to 12.5 billion connected objects, almost six devices per individual with access to the Internet. Now, as we move into 2015, the number of connected 'things' is expected to reach 25 billion, ultimately edging toward 50 billion by the end of the decade.
NASA engineer Brian Trease studied abroad in Japan as a high school student and used to fold fast-food wrappers into cranes using origami techniques he learned in library books. Inspired by this, he began to imagine that origami could be applied to building spacecraft components, particularly solar panels that could one day send solar power from space to be used on earth.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.