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TSL25711 Fiches technique(PDF) 2 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS |
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TSL25711 Fiches technique(HTML) 2 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS |
2 / 24 page TSL2571 LIGHT-TO-DIGITAL CONVERTER TAOS117A − FEBRUARY 2011 2 r r Copyright E 2011, TAOS Inc. The LUMENOLOGY r Company www.taosinc.com Detailed Description The TSL2571 light-to-digital device includes on-chip photodiodes, integrating amplifiers, ADCs, accumulators, clocks, buffers, comparators, a state machine, and an I2C interface. The device combines one photodiode (CH0), which is responsive to both visible and infrared light, and one photodiode (CH1), which is responsive primarily to infrared light. Two integrating ADCs simultaneously convert the amplified photodiode currents into 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. This digital output can be read by a microprocessor through which the illuminance (ambient light level) in lux is derived using an empirical formula to approximate the human eye response. 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 digital output of the device is inherently more immune to noise when compared to an analog interface. The device 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 ALS 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. Interrupt thresholds and persistence settings are configured independently. |
Numéro de pièce similaire - TSL25711 |
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Description similaire - TSL25711 |
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