- Approximates Human Eye Response - Programmable Analog Gain and Integration Time - 45,000,000:1 Dynamic Range - Operation to 60,000 lux in Sunlight - Very High Sensitivity Ideally Suited for Operation Behind Dark Glass - Package UV Rejection Filter Maskable Interrupt - Programmable Upper and Lower Thresholds with Persistence Filter Wait Timer and Power Management - Low Power 2.2 mA Sleep State with UserSelectable Sleep-After-Interrupt Mode 90 mA Wait State with Programmable Wait Time from > 8 seconds I C Fast Mode Compatible Interface - Data Rates to 400 kbit/s - Input Voltage Levels Compatible with VDD or 1.8-V Bus Register Set- and Pin-Compatible with the TSL2x71 Series Small 2 mm Dual Flat No-Lead (FN) Package
PACKAGE FN DUAL FLAT NO-LEAD (TOP VIEW)Applications D Display Backlight Control D Keyboard Illumination Control D Solid State Lighting Control for Daylight D
End Products and Market Segments D Mobile Handsets, Tablets, Laptops,Monitors and TVs, Portable Media Players Medical and Industrial Instrumentation White Goods Toys Industrial/Commercial Lighting Digital Signage Printers
DescriptionThe TSL2572 device family provides ambient light sensing (ALS) that approximates human eye response to light intensity under a variety of lighting conditions and through a variety of attenuation materials. Accurate ALS measurements are the result of TAOS' patented dual-diode technology and the UV rejection filter incorporated in the package. In addition, the operating range is extended to 60,000 lux in sunlight when the low-gain mode is used. While useful for general purpose light sensing, the TSL2572 device is particularly useful for display management to provide optimum viewing in diverse lighting conditions while extending battery life. The TSL2572 device family is ideally suited for use in mobile handsets, TVs, tablets, monitors, and portable media players where the display backlight may account for 70% of the system power consumption.
Interrupt Wait Control Upper Limit I2C Interface VDD CH0 ADC CH0 CH1 ADC GND CH1 Data CH0 Data Lower Limit
The TSL2572 light-to-digital device provides on-chip photodiodes, integrating amplifiers, ADCs, accumulators, clocks, buffers, comparators, a state machine, and an I2C interface. Each device combines a Channel 0 photodiode (CH0), which is responsive to both visible and infrared light, and a channel 1 photodiode (CH1), which is responsive primarily to infrared light. Two integrating ADCs simultaneously convert the amplified photodiode currents into a digital value providing 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.
TERMINAL NAME GND INT NC SCL SDA VDD NO. I I/O O TYPE DESCRIPTION Power supply ground. All voltages are referenced to GND. Interrupt open drain (active low). Do not connect. I2C serial clock input terminal clock signal for I2C serial data. I2C serial data I/O terminal serial data I/O for I2C. Supply voltage.
INTERFACE DESCRIPTION I2C Vbus = VDD Interface Vbus = VDD Interface I2C Vbus 1.8 V Interface I2C Vbus 1.8 V Interface
Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)Supply voltage, VDD (Note 3.8 V Input terminal voltage. 3.8 V Output terminal voltage. 3.8 V Output terminal current. 20 mA Storage temperature range, Tstg. to 85�C ESD tolerance, human body model. 2000 V
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
MIN Supply voltage, VDD TSL25725) (I2C Vbus = VDD) Supply voltage, VDD TSL25727) (I2C Vbus 1.8 V) Operating free-air temperature, 2.7 -30 NOM 3 MAX 3.6 70 UNIT V �C
