ams AS7263-BLGM

The AS7263 is a digital 6-channel spectrometer for spectral identification in the near IR (NIR) light wavelengths. AS7263 consists of 6 independent optical filters whose spectral response is defined in the NIR wavelengths from approximately 600nm to 870nm with full-width half-max (FWHM) of 20nm. An integrated LED driver with programmable current is provided for electronic shutter applications. The AS7263 integrates Gaussian filters into standard CMOS silicon via Nano-optic deposited interference filter technology and is packaged an LGA package that provides a built in aperture to control the light entering the sensor array. Control and Spectral data access is implemented through either the I²C register set, or with a high level AT Spectral Command set via a serial UART. The AS7263 6-channel Spectral_ID is a next-generation digital spectral sensor device. Each channel has a Gaussian filter characteristic with a full width half maximum (FWHM) bandwidth of 20nm. The channels are spaced roughly at 50nm intervals in the NIR spectrum: R, S, T, U, V, W. The sensor contains analog-to-digital converters (16-bit resolution ADC), which integrate the current from each channel’s photodiode. Upon completion of the conversion cycle, the integrated result is transferred to the corresponding data registers. The transfers are double-buffered to ensure that the integrity of the data is maintained. Interference filters enable high temperature stability and eliminate lifetime drift. Filter accuracy will be affected by the angle of incidence, and require 0° angle of incidence ±20.0° for specified accuracy. Angles of light beyond this will shift the spectral response of the filters. The LGA package aperture assists in the control of the light input, helping to maintain the proper angle of incidence at the sensors. AS7263 spectral conversion is implemented via two photodiode banks per device. Bank 1 consists of data from the S, T, U, V photodiodes. Bank 2 consists of data from the R, T, U, W photodiodes. Spectral conversion requires the integration time (IT in ms) set to complete. If both photodiode banks are required to complete the conversion, the 2nd bank requires an additional IT ms. Minimum IT for a single bank conversion is 2.8 ms. If data is required from all 6 photodiodes then the device must perform 2 full conversions (2 × Integration Time). The spectral conversion process is controlled with BANK Mode settings as follows: BANK Mode 0: Data will be available in registers S, T, U & V (R and W registers will be zero) BANK Mode 1: Data will be available in registers R, T, U & W (V and W registers will be zero) BANK Mode 2: Data will be available in registers R, S, T, U, V & W

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