TSL2560, TSL2561 LIGHT-TO-DIGITAL CONVERTER TAOS059N MARCH 2009 PACKAGE CS Approximates Human Eye Response 6-LEAD CHIPSCALE Programmable Interrupt Function with (TOP VIEW) User-Defined Upper and Lower Threshold Settings V 1 6 SDA DD 16-Bit Digital Output with SMBus (TSL2560) 2 at 100 kHz or I C (TSL2561) Fast-Mode at ADDR SEL 2 5 INT 400 kHz GND 3 4 SCL Programmable Analog Gain and Integration Time Supporting 1,000,000-to-1 Dynamic Range PACKAGE T Automatically Rejects 50/60-Hz Lighting 6-LEAD TMB Ripple (TOP VIEW) Low Active Power (0.75 mW Typical) with Power Down Mode V 1 6 SDA DD RoHS Compliant ADDR SEL 2 5 INT GND 3 4 SCL PACKAGE FN Description DUAL FLAT NO-LEAD (TOP VIEW) The TSL2560 and TSL2561 are light-to-digital converters that transform light intensity to a digital 2 V 1 6 SDA DD signal output capable of direct I C (TSL2561) or SMBus (TSL2560) interface. Each device com- ADDR SEL 2 5 INT bines one broadband photodiode (visible plus infrared) and one infrared-responding photodiode GND 3 4 SCL on a single CMOS integrated circuit capable of providing a near-photopic response over an effective 20-bit dynamic range (16-bit resolution). PACKAGE CL Two integrating ADCs convert the photodiode 6-LEAD ChipLED currents to a digital output that represents the (TOP VIEW) irradiance measured on each channel. This digital SDA 5 4 SCL output can be input to a microprocessor where illuminance (ambient light level) in lux is derived INT 6 3 ADDR SEL using an empirical formula to approximate the human eye response. The TSL2560 device V 1 2 GND permits an SMB-Alert style interrupt, and the DD TSL2561 device supports a traditional level style Package Drawings are Not to Scale interrupt that remains asserted until the firmware clears it. While useful for general purpose light sensing applications, the TSL2560/61 devices are designed particularly for display panels (LCD, OLED, etc.) with the purpose of extending battery life and providing optimum viewing in diverse lighting conditions. Display panel backlighting, which can account for up to 30 to 40 percent of total platform power, can be automatically managed. Both devices are also ideal for controlling keyboard illumination based upon ambient lighting conditions. Illuminance information can further be used to manage exposure control in digital cameras. The TSL2560/61 devices are ideal in notebook/tablet PCs, LCD monitors, flat-panel televisions, cell phones, and digital cameras. In addition, other applications include street light control, security lighting, sunlight harvesting, machine vision, and automotive instrumentation clusters. The LUMENOLOGY Company Copyright 2009, TAOS Inc. Texas Advanced Optoelectronic Solutions Inc. 1001 Klein Road Suite 300 Plano, TX 75074 (972) 673-0759 www.taosinc.com 1TSL2560, TSL2561 LIGHT-TO-DIGITAL CONVERTER TAOS059N MARCH 2009 Functional Block Diagram Channel 0 Visible and IR Integrating A/D Converter Channel 1 V = 2.7 V to 3.5 V IR Only DD Command ADC Address Select Interrupt ADDR SEL INT Register Register SCL Two-Wire Serial Interface SDA Detailed Description The TSL2560 and TSL2561 are second-generation ambient light sensor devices. Each contains two integrating analog-to-digital converters (ADC) that integrate currents from two photodiodes. Integration of both channels occurs simultaneously. Upon completion of the conversion cycle, the conversion result is transferred to the Channel 0 and Channel 1 data registers, respectively. The transfers are double-buffered to ensure that the integrity of the data is maintained. After the transfer, the device automatically begins the next integration cycle. 2 Communication to the device is accomplished through a standard, two-wire SMBus or I C serial bus. Consequently, the TSL256x device can be easily connected to a microcontroller or embedded controller. No external circuitry is required for signal conditioning, thereby saving PCB real estate as well. Since the output of the TSL256x device is digital, the output is effectively immune to noise when compared to an analog signal. The TSL256x devices also support an interrupt feature that simplifies and improves system efficiency by eliminating the need to poll a sensor for a light intensity value. The primary purpose of the interrupt function is to detect a meaningful change in light intensity. The concept of a meaningful change can be defined by the user both in terms of light intensity and time, or persistence, of that change in intensity. The TSL256x devices have the ability to define a threshold above and below the current light level. An interrupt is generated when the value of a conversion exceeds either of these limits. Available Options DEVICE INTERFACE PACKAGE LEADS PACKAGE DESIGNATOR ORDERING NUMBER TSL2560 SMBus Chipscale CS TSL2560CS TSL2560 SMBus TMB-6 T TSL2560T TSL2560 SMBus Dual Flat No-Lead 6 FN TSL2560FN TSL2560 SMBus ChipLED-6 CL TSL2560CL 2 TSL2561 I C Chipscale CS TSL2561CS 2 TSL2561 I C TMB-6 T TSL2561T 2 TSL2561 I C Dual Flat No-Lead 6 FN TSL2561FN 2 TSL2561 I C ChipLED-6 CL TSL2561CL Copyright 2009, TAOS Inc. The LUMENOLOGY Company 2 www.taosinc.com