TCS3103, TCS3104 LIGHT-TO-VOLTAGE COLOR SENSOR TAOS108B JULY 2010 PACKAGE FN Three-Channel RGB Color Sensor DUAL FLAT NO-LEAD Converts Light Intensity to Voltage (TOP VIEW) Single-Voltage Supply Operation V 1 6 V 4.5 V to 5.5 V DD OR Rail-to-Rail Output GND 2 5 V OG Programmable gain settings: MFP 3 4 V OB TCS3103 (2 , 4 ) TCS3104 (4 , 1 ) Low Supply Current 270 A Typical Fast Response Time Rise Time = 12 s Typical Low Dark Offset Description The TCS3103 and TCS3104 RGB Light-to-Voltage Converters combine three photodiodes with optical filters, amplifiers, and gain-switching circuitry on a single chip. The output of each channel is a voltage that is linearly proportional to light intensity (irradiance) on the corresponding photodiode element. Gain is switchable via a digital input pin from 1 to 4 on the TCS3104, and from 2 to 4 on the TCS3103 (as compared to 1 of TCS3104). Each channel on the device consists of a photodiode with a red, green, or blue optical filter, a current-to-voltage converter, and gain control elements. The voltage from each of the red, green, and blue channels is output on the V , V , and V pins, respectively. The single MFP pin controls the gain for all three channels. Each of OR OG OB the three photodiode channels is split into three elements, which are dispersed in a 3 3 array. This makes the device less sensitive to non-uniform illumination across the sensing area. The overall photodiode active area is 378 m 378 m. Each channel is factory-trimmed for low dark offset voltage and uniform sensitivity from device-to-device. The TCS3103 and TCS3104 are intended for use in a variety of applications including color-point feedback control in solid-state illumination and backlight systems, color adjustment in printers, process controls, diagnostic systems, paper and product handling, toys, and games. Functional Block Diagram V OR Red V OG Channel Green Channel Current-to-Voltage V OB Converter Blue Channel V = 4.5 V to 5.5 V DD Control MFP The LUMENOLOGY Company Copyright 2010, TAOS Inc. Texas Advanced Optoelectronic Solutions Inc. 1001 Klein Road Suite 300 Plano, TX 75074 (972) 673-0759 www.taosinc.com 1TCS3103, TCS3104 LIGHT-TO-VOLTAGE COLOR SENSOR TAOS108B JULY 2010 Detailed Description The TCS3103 and TCS3104 devices output a voltage that is linearly proportional to light intensity in the spectral range of interest on each of the three sensor channels. Figure 2 shows how each sensor responds to light of various wavelengths. The peak response of each of the three channels roughly corresponds to blue, green, and red portions of the visible light spectrum. Thus, when light impinges upon the three elements, each element gives an output that corresponds to the blue, green, and red components of the light. By measuring the amplitude and ratios of the three channels, information about the color of the light can be obtained. Each channel responds linearly to light intensity from a range of near zero light to a maximum value that is determined by the gain and the supply voltage of the device. The output of the device can swing from near ground level to near the supply voltage of the device. The dark voltage, or output of the device with no light input, is determined by internal amplifier offsets and is factory-trimmed to be a minimum value. If very accurate, low-level light measurement is required, the dark voltage value for each channel can be measured and subtracted from subsequent light readings to obtain a more accurate light measurement. The Multifunction Pin (MFP) on each device can be used for selecting gain mode (Table 1). Table 1. Device Programming Option Device Mode Details TCS3103 GSM (Gain Select Mode) 2 (MFP = 0) or 4 (MFP = 1) TCS3104 GSM (Gain Select Mode) 4 (MFP = 0) or 1 (MFP = 1) Terminal Functions TERMINAL TYPETYPE DESCRIPTIONDESCRIPTION NAME NO. GND 2 Power Power supply ground. All voltages are referenced to GND. MFP 3 I Multi-function logic input. V 1 Power Supply voltage. DD V 4 O Blue channel voltage output. OB V 5 O Green channel voltage output. OG V 6 O Red channel voltage output. OR Available Options DEVICE Gain PACKAGE LEADS PACKAGE DESIGNATOR ORDERING NUMBER TCS3103 2, 4 Dual Flat No-Lead 6 FN TCS3103FN TCS3104 4, 1 Dual Flat No-Lead 6 FN TCS3104FN Copyright 2010, TAOS Inc. The LUMENOLOGY Company 2 www.taosinc.com