Smartphone sensor module integrates multiple HMI and sensing categories

July 20, 2015 // By Graham Prophet
Universal remote control, barcode emulation, colour sensing, proximity and 3D gesture detection are brought together in a series of advanced optical sensing modules, the Tmx4903, from ams. The low-profile, optical sensor module reduces board space requirements and lowers smartphone BOM cost

In a low-profile 5.0 x 2.0 x 1.0 mm package, the high level of integration in the TMx4903 modules, of multiple optical sensing functions, plus an IR LED, give greater flexibility to system designers. The module variants in the series, the TMD4903 and TMG4903, perform accurate colour and proximity sensing, and integrate an IRBeam IR pattern generator. The IR pattern generator emits remote control beam patterns for any standards-compliant consumer product. The URC capability is also compatible with the Android Consumer.IR programming interface for remote-control applications on smartphones. Mobeam 1D barcode emulation for use at retail point-of-sale (POS) terminals is also supported.

The TMG4903 device also provides advanced touchless IR gesture-sensing capability. ams’ 3D gesture technology enables the recognition of complex hand gestures, supplementing simple north-south and east-west 2D gestures supported by ams’ 1st generation TMG3992 gesture sensor.

The TMx4903 3D gesture and proximity capability draws on the modules’ automatic adjustment of the IR LED’s timing and power output, minimising noise and power consumption while optimising sensitivity and dynamic range. The TMx4903 incorporates innovative circuit techniques which rejects ambient light noise. Automatic calibration removes electrical artifacts caused by noise and optical cross-talk. This integrated intelligent LED drive capability eliminates the requirement for the application processor to control LED driving functions which simplifies a phone’s software implementation and reduces processing capability required for instantaneous gesture recognition.

Pricing for the TMD4903 is $2.00 and the the TMG4903 is $2.50 (1,000). Evaluation boards for the TMD4903 and TMG4903 are available for qualified opportunities.

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