Using bq25504 for self-powered ambient light sensor
Ambient light sensors have become quite common in portable electronics to adjust the brightness of the screen. These sensors automatically increase the screen brightness when a portable device, such as a cell phone, is used in sunlight and dims or turns off the display when the cell phone is placed next to the ear. In this application report, a proof-of-concept, self-powered, ambient light sensor is described which is powered by a solar cell. The solar cell is used to power the device and as a light sensor. The output of the described circuit is a square-wave pulse whose frequency is proportional to the light intensity. The circuit does not require a battery to operate and automatically starts itself when sufficient ambient light is on the sensor.
View the PDF document for more information.
Originally published by Texas Instruments at www.ti.com as "Self-Powered, Ambient Light Sensor Using bq25504".
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