Broadcom APDS-9250

The APDS - 9250 device uses 4 individual channels of red, green, blue, and IR (RGB + 1R) in a specially designed matrix arrangement. This allows the device to have optimal angular response and accurate RGB spectral response with high lux accuracy over various light sources. APDS - 9250 supports the PC interface and has a programmable interrupt controller that frees up micro - controller resources. The device detects light intensity under a variety of lighting conditions and through a variety of attenuation materials, including dark glass. APDS - 9250 could be configured as Ambient Light Sensor and RGB + 1R Sensor. The color - sensing feature is useful in applications such as LED RGB backlight control, solid - state lighting, reflected LED color sampler, or fluorescent light color temperature detection. The integrated IR blocking filter makes this device an excellent ambient light sensor and color temperature monitor sensor together with the temperature compensation that allows output to have less variation over the temperature. The APDS - 9250 device contains multiple photodiodes for Light Sensor (R, G, B, IR channel) that are designed in a matrix placement to achieve optimal angular response at the fall of incident light angle. The device provides on - chip multiple diodes, ADCs, state machine, non - volatile memory and an I2C interface. Integration of all color sensing channels occurs simultaneously. Upon completion of the conversion cycle, the conversion result is transferred to the corresponding data registers. Communication with the device is accomplished through a fast (up to 400kHz), two - wire I2C serial bus for easy connection to a microcontroller or embedded controller. The APDS - 9250 provides a separate pin for interrupts. When interrupts are enabled and a preset value is exceeded, the interrupt pin is asserted and remains asserted until cleared by the controlling firmware. The interrupt feature simplifies and improves system efficiency by eliminating the need to poll a sensor for a light intensity. An interrupt is generated after completion of new conversion of the light sensor channels where the light sensor interrupt source can work on any of the Red, Green, Blue, IR channels. Additionally, a programmable interrupt persistence feature allows the user to determine how many consecutive exceeded thresholds are necessary to trigger an interrupt.

• Colour and Ambient Light Sensing (CS - RGB and ALS)
• Accuracy of Correlated Color Temperature (CCT)
• Individual channels for Red, Green, Blue and Infared
• Approximates Human Eye Response with Green Channel
• Red, Green, Blue, Infrared and ALS Sensing
• High Sensitivity in low lux condition – Ideally suited for Operation Behind Dark Glass
• Wide Dynamic Range: 18,000,000: 1
• Up to 20 - Bit Resolution
• Power Management
• Low Active Current – 130 μA typical
• Low Standby Current – 1 μA typical
• I2C - bus Fast Mode Compatible Interface
• Up to 400 kHz (I2C Fast - Mode)
• Dedicated Interrupt Pin
• Small Package L 2.0 × W 2.0 × H 0.65 mm

• OLED Display Control
• RGB LED Backlight Control
• Ambient Light Color Temperature Sensing