Development of Digital Brightness Sensor IC for Mobile phones by ROHM
With an increasing demand for higher functionality on mobile phones power saving on these little gadget is becoming a mundane task. One way to the over all power usage of the mobile phone is through minimizing it LCD backlight power usage. In order to achieve such power saving objectives manufacturers of mobile phones implement some sort of brightness control usually via a microcontroller and LED driver along with an ambient light sensor requiring a relatively fast bus speed. As result of this, in response to faster internal transmission speeds in mobile phones to keep up with an increasing pace in addition of new functionality on these devices, ROHM made an announcement on development of industry’s first digital ambient light sensor IC compatible with I2C bus Hs (High-speed) mode. The newly developed BH1780GLI is capable of transfer rate of 3.4Mbits/sec, 8.5 times faster than the conventional fast mode. Furthermore, the BH1780GLI features a high-precision A/D converter with a wide output range (0-65,535 lux, in 1 lux incremenents) for measuring the ambient light from darkness to direct sunlight plus spectral sensitivity characteristics similar to the human eye that is stable across various light sources such as incandescent/fluorescent lamps, sunlight. The new BH1780GLI also comes with a noise elimination function for reliable operation in presence of power source fluctuation such as AC oscillation. Finally, the unique laser trimming technology on the BH1780GLI limits sensitivity variation to ±20%.
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