STMicroelectronics integrates a 3-axis digital accelerometer and a 3-axis digital magnetic sensor in a single module. This digital compass module combines high precision, small size, low power consumption, competitive price and many other advantages to meet The market is increasingly demanding advanced navigation capabilities and emerging smart location services. ST's high-performance system-in-package digital compass uses Honeywell's magnetoresistive technology to accelerate portable consumer electronics applications with enhanced electronic compass capabilities including orientation search, map/display orientation, location services and walking directions Calculated.
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Combining high-performance motion detection with magnetic sensing capabilities can enhance the mobile device experience in many ways. STMicroelectronics' new module adds forward orientation capabilities, enabling application developers to increase the screen utilization of mobile phones/PDAs, displaying powerful map functions on a limited-size display, indicating the user's current location at the bottom of the map, and making the screen The rest shows the forward (front) direction.
ST's digital compass module provides accurate forward information, indicating the direction in which pedestrians or cars are traveling when there is no GPS signal; it also supports dead reckoning application algorithms, for example, in the absence of GPS signals or weak In the high-rise buildings or in the dense forested mountains, it provides navigation for pedestrians.
The compass module in the phone creates new opportunities for advanced location services. Equipped with compass and GPS, consumers can identify and retrieve information about related targets, such as restaurants or shopping malls, by pointing their phones at nearby facilities.
Benedetto Vigna, vice president and general manager of MEMS, sensors and high-performance analog products at STMicroelectronics, said: "As a preferred one-stop MEMS product supplier, STMicroelectronics paves the way for smart sensor module applications. We have accelerated Meters, gyroscopes and microphone sensors, in collaboration with Honeywell, and now with magnetic sensors, we are creating an era of sensory integration."
This new module benefits from ST's market-proven manufacturing technology and reliable design that has been used in more than 600 million accelerometers. The new module's high-precision sensing capabilities, combined with embedded intelligence, include wake-up/shutdown functions and 6D recognition that signals when the sensor moves up or down along three axes (x, y, z). The linear acceleration measurement range of the new module is ±2/±4/±8g, and the magnetic field strength measurement range is from ±1.3 to ±8 Gauss (2). These two ranges can be arbitrarily selected by the user.
The magnetic sensing elements in the module are based on Honeywell's anisotropic magnetoresistance (AMR) technology, which detects the direction and intensity of the Earth's magnetic field and determines the direction of travel relative to the north pole of the magnetic field. This technology has market-leading compass computing accuracy and low power consumption, which is critical for battery-powered devices.
AMR technology provides the same inductive sensitivity as the X and Y axes on the Z axis without the need for a flux enhancer for Hall effect type magnetic sensors. The disadvantage of the Hall effect type magnetic sensor is that the displacement voltage shift occurs in the sensor after the magnetic flux enhancer is magnetized. In environments with extremely low magnetic field strengths, such as in metal buildings and automobiles, or in high-latitude regions such as Canada and Northern Europe, STMicroelectronics' unique three-axis sensor solution on the market can reduce detection errors.
In Honeywell's magnetic sensor design, the offset voltage cancellation circuit minimizes the need to calibrate the sensor; the patented set/reset strap demagnetizes the sensor, removing the sensor's magnetism and improving each measurement Precision.
According to research by market research firm iSuppli, the MEMS digital compass market for mobile phones only will grow from 8 million in 2008 to 540 million in 2013, with a compound annual growth rate (CAGR) of 129%. During this period, the revenue of mobile digital compass components will increase from 8 million US dollars to 325 million US dollars, with a compound annual growth rate (CAGR) of 110%.
STMicroelectronics' LSM303DLH digital compass module is available in a 5x5x1mm environmentally friendly package, software and registers compatible with ST's three-axis digital accelerometer series (LIS331DLH/M/F). Samples are available and mass production is ready.
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