Position Sensors / Detectors / Transducers
Miniature Hall-Effect Linear Sensors are user-programmable.
Press Release Summary:
Offered in TO-92 or SOT-23W packages, A138xELHLT-T series features one-time programmable read-only memory that lets users optimize device in finished sensor assembly. Sensitivity may be finely adjusted around 4 predetermined nominal values of 2.5, 3.1, 5.0, or 7.0 mV/G through series of voltage pulses on output of either 3-lead package. Along with dynamic offset cancellation, features include adjustable quiescent output voltage, temperature coefficient, and output polarity.
Original Press Release:
Allegro® Announces a New Family of User- Programmable, Hall-Effect Linear Sensors in Miniature Packages
Worcester, MA, February 16, 2007 - Allegro® is introducing to the industry the first family of programmable, Hall-effect, linear sensors available in miniature package options: TO-92 (3-lead, single in-line package) or SOT-23W (3-lead, surface mount). This new family of devices further enhances Allegro's already diverse portfolio of position detecting sensors as they provide users with the accuracy and flexibility of fully programmable linears without the penalty of a larger package and higher cost. This flexibility and accuracy is accomplished in two ways. First, the one-time programmable, read-only memory (OTP-ROM) contained in these analog sensors allows users to optimize the device in a finished sensor assembly. This optimization serves to reduce inaccuracies caused by manufacturing tolerances and simplifies the assembly process. Second, the patented dynamic offset cancellation provides extremely low offset and minimal temperature drift.
Through a series of voltage pulses on the output of either three-lead, miniature package, the user is able to finely adjust the sensitivity of these devices around one of four predetermined nominal values (2.5 mV/G, 3.1 mV/G, 5.0 mV/G and 7.0 mV/G). Even greater flexibility is available by means of adjusting the quiescent output voltage (output without the presence of a magnetic field), and the temperature coefficient, as well as setting the output polarity for each device. The temperature coefficient of this family is designed to compensate for temperature coefficients of typical samarium cobalt (SmCo) magnets.
Targeting primarily the automotive and industrial markets, Allegro's A138xELHLT-T is priced at $1.01 in quantities of 1,000 and the A138xLLHLT-T is priced at $1.07 in quantities of 1,000. All devices in the series have a 12 - 14 week typical lead-time to market. For more information on these devices download the datasheet at the following link: www.allegromicro.com/datafile/1381.pdf
About Allegro
Allegro MicroSystems, Inc. is a global leader in the development, manufacture and marketing of high-performance power integrated circuits and integrated Hall-effect magnetic sensors. Allegro's innovative, system-level solutions serve high-growth applications within the automotive, computer/office automation, industrial, consumer and communications markets. With more than 2,500 employees, Allegro is headquartered in Worcester, MA. Further information about Allegro can be found at www.allegromicro.com.
