ams TSL2740 Ambient Light Sensor

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Description

The TSL2740 includes both proximity detection and very-high sensitivity light-to-digital converter ambient light sensing (ALS) features. The proximity detection feature provides object detection using photodiode detection with reflected IR energy. The detect/release events are interrupt driven, and occur when proximity result crosses upper and/or lower threshold settings. The proximity engine features offset adjustment registers to compensate for unwanted IR energy reflection at the sensor. Proximity results are further improved by automatic ambient light subtraction. The ALS feature approximates the human eye response to light intensity under varying lighting conditions and transforms this light intensity to a digital signal output capable through a 1.8V I²C interface. The ALS sensor features 2 output channels, a visible channel and an IR channel. The visible channel has a photodiode with a photopic Interferometric UV and IR blocking filter and the IR channel has a photodiode with an IR pass filter. Each channel has a dedicated integrating data converter which converts photodiode current into a 16-bit digital output. This digital output can be interfaced with a microprocessor where illuminance in lux is derived to accurately measure ambient light to control a displays baklight.

Details

Features

  • Integrated on-chip photopic filter
  • High Sensitivity down to mLux levels
  • 0.18µm process technology with 1.8V I²C
  • 1M:1 dynamic range
  • Programmable proximity offset adjustment
  • Proximity automatic ambient light subtraction

Benefits

  • Provides near photopic responsiveness
  • Design flexibility for dark glass & placement
  • Reduces power consumption
  • Enables dark room to sunlight operation
  • Compensates for unwanted IR energy system crosstalk reflection
  • Compensates for unwanted ambient light photodiode current

Parameters

Function
ambient light sensing
proximity detection
Supply voltage
1.8 V
min.
1.7 V
max.
1.98 V
Interface
input
I²C slave (400kHz)
output
I²C slave (400kHz)
Operating ambient temperature
min.
-30 °C
max.
85 °C
Emitter quantity
external
Integrated diffuser
No
Package
QFN
Package dimension
l
2.0 mm
w
2.0 mm
h
0.5 mm
Input/Output Voltage
1.8 V

Ordering codes

Product Type Description Order No. Availability
TSL27403M
TSL27403

Downloads

Application note

Technical documents

Environmental documents

Images