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TSL25711 Datasheet(PDF) 7 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS |
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TSL25711 Datasheet(HTML) 7 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS |
7 / 24 page TSL2571 LIGHT-TO-DIGITAL CONVERTER TAOS117A − FEBRUARY 2011 7 The LUMENOLOGY r Company r r Copyright E 2011, TAOS Inc. www.taosinc.com PRINCIPLES OF OPERATION System State Machine The device provides control of ALS and power management functionality through an internal state machine (Figure 5). After a power-on-reset, the device is in the sleep mode. As soon as the PON bit is set, the device will move to the start state. It will then continue through the Wait and ALS states. If these states are enabled, the device will execute each function. If the PON bit is set to 0, the state machine will continue until all conversions are completed and then go into a low power sleep mode. Sleep Start Wait ALS PON = 1 (r 0:b0) PON = 0 (r 0:b0) Figure 5. Simplified State Diagram NOTE: In this document, the nomenclature uses the bit field name in italic followed by the register number and bit number to allow the user to easily identify the register and bit that controls the function. For example, the power on (PON) is in register 0, bit 0. This is represented as PON (r0:b0). Photodiodes Conventional silicon detectors respond strongly to infrared light, which the human eye does not see. This can lead to significant error when the infrared content of the ambient light is high (such as with incandescent lighting) due to the difference between the silicon detector response and the brightness perceived by the human eye. This problem is overcome through the use of two photodiodes. The channel 0 photodiode, referred to as the CH0 channel, is sensitive to both visible and infrared light, while the channel 1 photodiode, referred to as CH1, is sensitive primarily to infrared light. Two integrating ADCs convert the photodiode currents to digital outputs. The ADC digital outputs from the two channels are used in a formula to obtain a value that approximates the human eye response in units of lux. |
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