Renesas Electronics’ new 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).
It is designed to allow system manufacturers to 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 equipment and lighting fixtures for both indoor and outdoor use.
An internal circuit performs calculations based on signals from multiple light receivers with different wavelength sensitivity characteristics, enabling a reduction to ±20% 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.
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. The device’s clear mould SON package measures 1,56 x 2,55 x 0,55 mm. The gap between pins of 0,5 mm and SON package ensure high mounting density on the printed circuit board.
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