TSL2580FN(2010) Ver la hoja de datos (PDF) - austriamicrosystems AG
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TSL2580FN Datasheet PDF : 35 Pages
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TSL2580, TSL2581
LIGHT-TO-DIGITAL CONVERTER
TAOS098 − MARCH 2010
Functional Block Diagram
Channel 0
Visible and IR
Integrating
A/D Converter
VDD = 2.7 V to 3.6 V
Channel 1
IR Only
alid ADDR SEL
Address Select
Command
Register
ADC
Register
Two-Wire Serial Interface
Interrupt
INT
SCL
SDA
v Detailed Description
ill The TSL2580 and TSL2581 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
t 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
G s integrity of the data is maintained. After the transfer, the device automatically begins the next integration cycle.
Communication to the device is accomplished through a standard, two-wire SMBus or I2C serial bus.
A t Consequently, the TSL258x 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
s n of the TSL258x device is digital, the output is effectively immune to noise when compared to an analog signal.
e The TSL258x devices also support an interrupt feature that simplifies and improves system efficiency by
m t 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
a n both in terms of light intensity and time, or persistence, of that change in intensity. The TSL258x devices have
the ability to define a threshold above and below the current light level. An interrupt is generated when the value
Technical co of a conversion exceeds either of these limits.
Copyright E 2010, TAOS Inc.
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www.taosinc.com
The LUMENOLOGY r Company
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