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Integration, regulation rev up automotive MEMS

Posted: 17 Jun 2011 ?? ?Print Version ?Bookmark and Share

Keywords:automotive? MEMS? CMOS?

MEMS made from etched silicon traces its roots to a device pioneered by Motorola in the 1980s, more specifically to an alternative form of pressure sensor designed for industrial and extreme-environment use.

In the 1990s, MEMS devices hit the mainstream as accelerometers for automotive airbag sensors. From there, MEMS devices went on to function as "drop" sensors in hard drives before finding myriad slots in CE controls. "Automotive is still a very big market [for MEMS], and one of the big applications is [still] the airbag sensor. We reckon there are three to 3.2 airbag sensors per vehicle," said Laurent Robin, market analyst for inertial sensors at market research company Yole Dveloppement.

The MEMS market was worth about $8.7 billion in 2010, according to Yole; automotive MEMS claimed about $1.48 billion of that total, or 17 percent. The market is set to grow by 8 percent in value terms in 2011, Robin said; but the dollar growth figure, mitigated by strong downward price pressure of 5 to 20 percent per year, does not reflect the market's strong unit growth.

The main types of MEMS sensors in automotive use are pressure sensors, used in tire pressure monitoring system (TPMS) designs; accelerometers, used in airbags; and gyroscopes, used for orientation and electronic stability control.

Although the number of cars produced each year is climbing, as is the number of electronic subsystems per car, the automotive MEMS market is largely driven by mandate and regulations, said Marco Ferraresi, automotive business development manager for STMicroelectronics.

The TPMS mandate, for example, was introduced in the U.S. in 2007; in the European Union, starting in 2012, all new passenger cars must be equipped with TPMS solutions that meet even tighter specifications than in the U.S., Ferraresi said. Japan is expected to adapt the EU legislation for its industry approximately one year after the European rollout, said Ferraresi, and South Korea is expected to introduce the legal requirement for TPMS in 2013.

"Airbags, which use accelerometers as part of a trigger, are standard in the U.S. and Europe but not in the BRIC countries," Ferraresi added. But "airbags are coming in Brazil and China" and are likely to be mandated in those countries eventually, presenting a growth opportunity for MEMS.

Meanwhile, demand is high in Brazil for subsystems that track stolen vehicles. The technology is GPS?based, but accelerometers are used for the wake?up function. The vehicle?tracking market also presents a medium?term opportunity for inertial sensors, including gyroscopes, Ferraresi said.

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