Spectrometer 2 Click is a compact add-on board that collects light waves. This board features the VD6283TX, a color sensor with advanced light flicker extraction from STMicroelectronics. The VD6283TX performs fast and accurate light measurements thanks to an individual ADC and a readout for each color channel - red, green, blue, IR, clear, and visible. It uses hybrid color filters with precise responses allowing accurate computation of the correlated color temperature (CCT) and Lux information. Its patented architecture and a high-performance photodiode design can also extract light-flickering frequencies to avoid “banding effects” or check that they are safe for the human eye. This Click board™ is suitable for screen brightness adjustment and white balance color assistance, lux and CCT measurement, or light frequency extraction for flicker correction assistance.

Spectrometer 2 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.

Spectrometer 2 Click as its foundation uses the VD6283TX, a color sensor with advanced light flicker extraction from STMicroelectronics. It performs fast and accurate light measurements thanks to an individual ADC with a resolution of 24 bits (16 bit + 8 bit for high accuracy under low light) and a readout for six color channels: red, green, blue, IR, clear, and visible. The color channels can be individually enabled to optimize power consumption, alongside 15 programmable gains for a high-dynamic range, through a serial interface. Six channels can operate with independent, parallel reading for ALS or flicker operations, one represents a dedicated fast channel for light flicker measurement, and one stands for an internal dark channel.

The VD6283TX uses hybrid color filters with precise responses allowing accurate computation of the correlated color temperature (CCT) and Lux information. Its patented architecture and a high-performance photodiode design can also extract light-flickering frequencies from a minimum of 100Hz and a maximum frequency of 2kHz, including LED square signals, to avoid “banding effects” or check that they are safe for the human eye.

Spectrometer 2 Click communicates with MCU using the standard I2C 2-Wire interface with a maximum clock frequency of 1MHz, fully adjustable through software registers. The VD6283TX does not require a specific Power-Up sequence but requires a voltage of 1.8V for its interface and logic part to work correctly. Therefore, a small regulating LDO is used, the ADP151, providing a 1.8V out of 3.3V mikroBUS™ power rail. Since the sensor for operation requires a power supply of 1.8V, this Click board™ also features the PCA9306 voltage-level translator allowing the VD6283TX to work with 3.3V MCU properly.

The VD6283TX can stream the following data continuously: ALS color data over the I2C interface and raw flicker data over the AN pin of the mikroBUS™ socket. It also possesses an additional interrupt signal, routed on the INT pin of the mikroBUS™ socket labeled as INT, indicating when a specific interrupt event occurs.

This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.

• Interface: Analog, I²C
• Compatibility: mikroBUS™
• Dimensions: 28.6 x 25.4mm
• Input Voltage: 3.3V
• Peak Wavelength (R/G/B/VIS/IR/C): 610/550/470/560/820/680 nm
• AC Flicker Frequency Detection Range: Min. 100Hz, Max. 2000Hz
• Resolution: Min. 16 bit, Max. 24 bit
• Operating Temperature Range: Min. -30°C, Typ. +25°C, Max. +85°C

• Schematic
• VD6283TX Datasheet
• mikroSDK
• GitHub