Reference design for a wise backlight system that makes use of ambient and proximity sensors to regulate the lighting.
The backlight and good lighting management methods assist to optimize power consumption and enhance person expertise. Texas Devices (TI) has launched a reference design for backlight and good lighting management utilizing ambient mild and proximity sensors, making the good backlight design course of extra simple. The design is appropriate for varied functions resembling constructing automation, proximity detection, wi-fi options connectors, and so on. The system designed utilizing this reference design can preserve energy and enhance the lifespan of the backlight by mechanically adjusting the backlight brightness based mostly on the ambient mild within the atmosphere. A capacitive proximity sensor can even activate the system when a person approaches, resulting in additional energy financial savings. The optical mild sensor helps the system modify backlight brightness and supply a cushty view to the customers.
The reference design is predicated on the MSP430FR5969 Microcontroller Unit (MCU) that makes use of ferroelectric random entry reminiscence (FRAM) as a substitute of flash reminiscence to make the design extra energy environment friendly. A low-power backlight controller is used within the reference design to save lots of energy and allow the dimming options of the LCD backlight utilizing pulse width modulation (PWM) to regulate Gentle Emitting Diode (LED) brightness. With the usage of an ambient mild sensor, the reference design can dynamically modify the backlight brightness to optimize the viewing expertise. The proximity sensor employs a Capacitance-to-Digital Converter FDC1004, which detects the presence of an individual and compensates for environmental fluctuations. The design additionally features a humidity and temperature sensor, which may be utilized for compensation within the occasion of temperature or humidity adjustments. The backlight controller, Capacitance-to-Digital Converter and humidity and temperature sensor are related to the primary MCU by way of an inter-integrated controller (I2C) bus.
The good backlight encompasses a lux sensing vary of 0.01 lux to 83 klux and a Capacitive sensing distance threshold of 20 cm. The reference design operates at an enter voltage of 5V. The system’s working temperature is restricted by the Liquid-crystal show (LCD) display screen and ranges from –20°C to 70°C. The design comes with a dynamically adjusted backlight brightness, an Ultraviolet (UV) filter for outside use and an electromagnetic (EM) connector for wi-fi options. LCD, backlight panel, person, and reset buttons are situated on the entrance of the board. The ambient mild sensor is positioned in the course of the highest part of the LCD panel. To forestall any errors within the mild readings, the highest parts of each the LCD and backlight are blacked out.
This reference design has been examined by TI. It comes with BOM, schematics, Gerber file, Printed circuit board (PCB) structure, computer-aided design/ computer-aided engineering (CAD/CAE) symbols, Meeting drawing, Schematic, and so on. You could find extra information in regards to the reference design on the corporate’s web site.
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