Digital ambient illuminance sensor in thin SON package
The digital ambient illuminance sensor is designed to contribute to improved performance and reduced power consumption, for example by automatically adjusting display brightness for the best viewing experience.
The PH5551A2NA1 is a digital ambient illuminance sensor that detects the brightness of ambient light and sends a corresponding signal to a device such as a microcontroller (MCU). By using the sensor, system manufacturers can develop more compact and precise automatic brightness adjustment or automatic on/off circuits for digital household appliances and electronics, mobile terminals and handsets, factory automation (FA) equipment, and lighting fixtures for both indoor and outdoor use.
The PH5551A2NA1 employs a clear mold package design technology and manufacturing technology accumulated over many years by Renesas Electronics in the development and commercialization of photo detector IC products. Its clear mold SON package measures only 1.56-mm x 2.55-mm x 0.55-mm, among the smallest and thinnest in the industry. The gap between pins of 0.5-mm and SON package make it easy to achieve a high mounting density on the printed wiring board.
An internal circuit performs calculations based on signals from multiple light receivers with different wavelength sensitivity characteristics, enabling a reduction to ±20 percent of sensitivity variation due to different light sources, such as fluorescent lamps, LEDs, and incandescent bulbs. This enables control that corresponds to the ambient brightness as perceived by human beings, regardless of the illumination environment.
In digital signal output applications for ambient illuminance sensors, two I2C™ bus slave addresses (identification numbers) are typically assigned, so multiple illuminance sensors can be connected to a single MCU and their uses can be allocated as required. The PH5551A2NA1 incorporates an interrupt function that can output a signal to the master device, such as an MCU, when the brightness exceeds a preset threshold value. This eliminates the need for constant communication between the MCU and the sensor and reduces the processing load on the MCU.
For further infomation: www.renesas.eu.
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