Honeywell announced the SL353 Series Micropower Omnipolar Digital Hall-Effect Sensor Integrated Circuits (ICs). The SL353 Series uses a BiCMOS IC design, a new Honeywell technology, which makes it possible to add more performance and functionality while reducing the size of the IC (compared to bipolar technology).
The low supply voltage (as low as 2.2 Vdc) for the SL353 Series, combined with very low average current (1.8 µA typ. for the SL353LT – the lowest in its class), reduces power consumption, extends battery life, and promotes energy efficiency. The product is available in two duty cycle configurations to accommodate a variety of low-power applications:
• SL353HT: High duty cycle (13% typ.) and low current drain (0.33 mA typ., 2.8Vdc typ.) for use in energy-efficient, “green” products requiring higher switching frequencies.
• SL353LT: Very low duty cycle (0.013% typ.) and ultra low current drain
(1.8 µA typ., 2.8 Vdc typ.) resulting in extended battery life for use in battery-operated, mobile applications.
Built-in timing circuitry in the SL353 Series turns the power to the IC on for a very short time – it is off for the balance of the period – significantly reducing the average current consumption. The push-pull output does not require an external pull-up resistor, which simplifies interface with common electrical circuits and potentially reduces PC board space and costs to the customer. The non-chopper stabilized design means that no filter is needed to compensate for the noise generated by this technique, helping to reduce PC board space, part counts, and application costs. The balanced integrated circuit provides stable operation over a wide temperature range of
-40 C to 85 C [-40 F to 185 F].
Because these sensors can be operated by a North pole or a South pole, they do not require the magnet polarity to be identified, allowing easier installation and potentially reducing system costs. The SOT-23 subminiature package size requires less PC board space, allowing for use in smaller assemblies. These sensors are supplied on tape and reel which allows for a compact design with automated component placement, helping to reduce manufacturing costs.
The SL353 Series Micropower Omnipolar Digital Hall-Effect Sensor ICs are designed for battery-operated, mobile equipment such as: door or lid closure detection in notebooks, scanners, hand-held industrial computers or instrumentation; mobile printer head position sensing; small hand-held medical or dental equipment; battery-operated infusion pumps, insulin pumps or other wearable medical devices; trigger switches for battery-operated hand tools; reed switch replacement in battery operated security systems; magnetic encoders for building access (array); power switch or open-close detection in small battery-operated appliances (vacuum cleaner, fan, etc.); and gas or water consumption measurement in remote, battery-operated utility meters.
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