STMicroelectronics Unveils MEMS Digital Compass Module

High-performance motion and magnetic-sensing device enhances mobile navigation and enables advanced location-based services

STMicroelectronics has integrated a 3-axis digital accelerometer with a 3-axis digital magnetic sensor in a single module to create a digital compass module. This uses magneto-resistive technology from Honeywell and aims to accelerate the adoption of enhanced electronic compassing in portable consumer applications, including direction finding, map/display orientation, location-based services and pedestrian dead reckoning.
The combination of high-performance motion and magnetic sensing enhances the mobile-user experience in a number of ways. ST’s new module adds forward direction orientation that enables application developers to improve the use of limited phone/PDA display size for maps by putting the current user position at the bottom of the map with the rest of the display in the forward (‘up ahead’) direction.
ST’s digital compass provides accurate heading information, to indicate the direction in which a person or vehicle is moving, when GPS is not available. It also supports dead-reckoning applications, including pedestrian navigation in places with no or low GPS signal, such as inside buildings and structures or in mountainous and forested terrain.
Compass modules in handsets open new possibilities for advanced location-based services. With compassing and GPS capabilities, consumers will be able to identify and retrieve information on nearby points of interest, such as restaurants or shops, by simply pointing their mobile devices in the direction of the object concerned.

”As the one-stop MEMS supplier of choice, STMicroelectronics is paving the way to smart sensor modules,” said Benedetto Vigna, Group Vice President and General Manager of the MEMS, Sensors and High Performance Analog Division, STMicroelectronics. “We have accelerometers, gyroscopes, microphones and now, thanks to our cooperation with Honeywell, also magnetic sensors. We are ushering in an era of integrated sensing capabilities.”

The new module uses high-precision sensing coupled with smart embedded features, including wake-up/power-down function and 6D recognition, which signals if the device is up or down along all three axes (x,y,z). The device has a linear acceleration full-scale of ±2/±4/±8g and a magnetic field full-scale from ±1.3 up to ±8 gauss(2), both fully selectable by the user.

The magnetic sensing element that measures the strength and direction of the Earth’s magnetic field and determines the heading relative to magnetic north is based on Honeywell’s Anisotropic Magneto-Resistive (AMR) technology. This technology combines best-in-class accuracy in compass calculations with low power consumption, which is crucial in battery-hungry portable devices.

The AMR technology provides the same sensitivity on the z axis as it does on the x and y axes, eliminating the need for flux concentrators used in Hall-effect type sensors that can shift the sensor offset after it has been magnetized. This market-unique three-axis sensing approach reduces measurement errors in ultra-low magnetic field strength environments, such as in metal buildings, automobiles, or in higher latitudes like Canada or Northern Europe.

Moreover, Honeywell’s magnetic sensor design includes a built-in offset cancellation circuit to minimize the need for calibration, and patented set/reset straps that de-gauss, or de-magnetize, the sensor for each measurement to improve accuracy.



According to iSuppli, the market for MEMS digital compasses for use in mobile phone applications alone will grow from 8 million units in 2008 to 540 million units in 2013 – a CAGR of 129%. During the same time period, revenues for these components will grow at a CAGR of 110%, from $8 million to $325 million.


ST’s LSM303DLH digital compass module fits in an eco-friendly package of 5x5x1 mm and it is software- and register-compatible with ST’s three-axis digital accelerometer family (LIS331DLH/M/F). Samples are available and the device is ready for mass production. Unit pricing is $2.50 for volumes in the range of 50,000 pieces.

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iPhone shortage has industry impact

The launch of the iPhone in China is having a significant impact on other parts of the market, particularly the supply of NAND flash memory chips.
Digitimes reports Taiwan-based memory module houses seeing a serious shortage of the chips.
Samsung Electronics has informed Taiwan module makers that it will halve its NAND flash supply to them in September, and Micron Technology has also told some of its downstream customers that no NAND flash chips are available, it says from sources. Toshiba and Hynix Semiconductor are also giving priority to Apple, and are offering limited supply to the spot market, the sources added.
The average spot price of 16Gb multi-level cell (MLC) chips rose 0.85% to close at US$5.17 on September 11, and the 32Gb part was up 0.5% to US$7.13, according to DRAMeXchange. In the contract market, average pricing for 16Gb chips climbed 7.2% to US$4.48 in the first half of September, and 32Gb went up 4.3% to US$6.80.