Infineon Technologies' first microelectromechanical system was a pressure sensor developed for its Automotive, Industrial and Multimarketing group. Now well known for its MEMS side-air-bag and tire-pressure sensors, Infineon AIM has branched out into inertia sensors, mainly for rollover detection and response. In 2003, Infineon acquired Norway's SensoNor AS to leverage that company's 20 years of MEMS experience. And last year, Infineon announced its first consumer electronics MEMS sensor, a silicon microphone that is the first of a planned family of consumer sensors aimed at cell phones, global positioning systems, laptops and even toys. Torsten Fischer, director of sensors and controls at Infineon, spoke with EE Times contributor R. Colin Johnson about Infineon's MEMS activity, both past and future.