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TCS3471 Datasheet(PDF) 2 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS |
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TCS3471 Datasheet(HTML) 2 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS |
2 / 22 page TCS3471 COLOR LIGHT-TO-DIGITAL CONVERTER TAOS115 − MARCH 2011 2 r r Copyright E 2011, TAOS Inc. The LUMENOLOGY r Company www.taosinc.com Functional Block Diagram SDA VDD INT SCL Wait Control Clear ADC Upper Limit Lower Limit Interrupt GND Red ADC Green ADC Blue ADC Clear Data Red Data Green Data Blue Data RGBC Control Blue Green Red Clear Detailed Description The TCS3471 light-to-digital device contains a 4 × 4 photodiode array, integrating amplifiers, ADCs, accumulators, clocks, buffers, comparators, a state machine, and an I2C interface. The 4 × 4 photodiode array is composed of red-filtered, green-filtered, blue-filtered, and clear photodiodes — four of each type. Four integrating ADCs simultaneously convert the amplified photodiode currents to a digital value providing up to 16 bits of resolution. Upon completion of the conversion cycle, the conversion result is transferred to the data registers. The transfers are double-buffered to ensure that the integrity of the data is maintained. Communication to the device is accomplished through a fast (up to 400 kHz), two-wire I2C serial bus for easy connection to a microcontroller or embedded controller. The TCS3471 provides a separate pin for level-style interrupts. When interrupts are enabled and a pre-set 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 value. An interrupt is generated when the value of an RGBC conversion exceeds either an upper or lower threshold. In addition, a programmable interrupt persistence feature allows the user to determine how many consecutive exceeded thresholds are necessary to trigger an interrupt. Terminal Functions TERMINAL TYPE DESCRIPTION NAME NO. TYPE DESCRIPTION GND 3 Power supply ground. All voltages are referenced to GND. INT 5 O Interrupt — open drain. NC 4 Do not connect SCL 2 I I2C serial clock input terminal — clock signal for I2C serial data. SDA 6 I/O I2C serial data I/O terminal — serial data I/O for I2C . VDD 1 Supply voltage. |
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