Gesture recognition chip reduces footprint by 50%

November 08, 2016 // By Christoph Hammerschmidt
With the E909.21, chipmaker Elmos AG is introducing an integrated circuit for proximity detection and gesture recognition as a component for human-machine interaction concepts in automotive environments. The product cuts the BOM by 40%, the footprint by as much as 50%, the vendor promises.

The E909.21 detects objects and movements in real-time by means of infrared light. Elmos claims that the device offers the best immunity to extraneous light on the market. In addition it features automatic system calibration and good scalability to support all available and future display sizes. In comparison to earlier implementations, numerous additional functions have been integrated to facilitate sensor design and system layout. It is based on the E909.06 which is available since more than five years and used by various OEMs for series vehicles.

The device utilizes the Halios approximation recognition principle – according to Elmos the only technology utilizing optical compensation, eliminating almost completely parasitic effects from the receiver. Hitherto, about 30 million Halios devices have been sold.

The chip has two receiver and four LED transmit channels as well as a special Halios compensation path. For each transmit channel, there is a separated 100mA current driver on the chip. The sensitivity of the analog frontend has been increased by a factor of 3 over the predecessor product. To rule out interferences with other optical systems, the Halios switching frequency can be adjusted up to a maximum of 1 MHz.

The integrated 16bit CPU in Harvard architecture can be clocked at 4, 8, 12 or 24 MHz. The chip also has 32 kByte of Flash memory, 4 kByte SRAM and 8 kByte SysROM. The device is specified for an operating temperature range between -40°C and +85°C.

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