OPT3001

Part: OPT3001 — Texas Instruments

Type: Digital Ambient Light Sensor (ALS)

Description: Single-chip lux meter measuring 0.01 to 83k lux with human-eye spectral response, >99% (typ) IR rejection, 1.8 μA (typ) active current, and an I²C/SMBus interface, powered from 1.6–3.6 V.

Operating Conditions:

• Supply voltage: 1.6–3.6 V
• Operating temperature: -40 to +85 °C
• I²C pull-up supply: 1.6–5.5 V (VDD ≤ VI²C)

Absolute Maximum Ratings:

• Max supply voltage (VDD to GND): 6 V
• SDA, SCL, INT, ADDR to GND: -0.5 to 6 V
• Current into any pin: 10 mA
• Max junction temperature: 150 °C
• Storage temperature: -65 to +150 °C

Key Specs:

• Quiescent current (active, VDD = 3.6 V): 1.8 μA typ, 2.5 μA max
• Quiescent current (shutdown, VDD = 3.6 V): 0.3 μA typ, 0.47 μA max
• Resolution (lowest full-scale range): 0.01 lux; full-scale illuminance 83865.6 lux
• Peak spectral responsivity: 550 nm
• Integration time: 100 ms (CT = 0) or 800 ms (CT = 1), ±10%
• Linearity: 2% typ (>40 lux), 5% typ (<40 lux)
• Measurement drift across temperature: 0.01 %/°C typ (2000 lux)
• Half-power angle: 47° typ
• Dark condition output: 0 typ, 3 ADC codes max
• I²C: fast mode up to 0.4 MHz, high-speed mode up to 2.6 MHz
• Power-on-reset threshold: 0.8 V typ
• VOL (SDA, INT) at IOL = 3 mA: 0.32 V max
• RθJA: 71.2 °C/W (USON-6)

Features:

• Precision optical filtering to match the human eye; rejects >99% (typ) of IR
• Automatic full-scale setting with 23-bit effective dynamic range
• 12 binary-weighted full-scale ranges, <0.2% (typ) matching between ranges
• Continuous or single-shot measurement modes
• Flexible interrupt system with programmable window comparison
• 5.5 V tolerant I/O
• Starts up in low-power shutdown state

Applications:

• Display backlight controls
• Lighting control systems
• Tablet and notebook computers
• Thermostats and home automation appliances
• Point-of-sale terminals
• Outdoor traffic and street lights
• Cameras

Package:

• USON-6 (DNP), 2.00 mm × 2.00 mm (nominal body size)

• 1 · Precision Optical Filtering to Match Human Eye:
• -Rejects > 99% (typ) of IR
• Automatic Full-Scale Setting Feature Simplifies Software and Ensures Proper Configuration
• Measurements: 0.01 lux to 83 k lux
• 23-Bit Effective Dynamic Range With Automatic Gain Ranging
• 12 Binary-Weighted Full-Scale Range Settings: < 0.2% (typ) Matching Between Ranges
• Low Operating Current: 1.8 μA (typ)
• Operating Temperature Range: -40°C to +85°C
• Wide Power-Supply Range: 1.6 V to 3.6 V
• 5.5-V Tolerant I/O
• Flexible Interrupt System
• Small-Form Factor: 2.0 mm × 2.0 mm × 0.65 mm

• Display Backlight Controls
• Lighting Control Systems
• Tablet and Notebook Computers
• Thermostats and Home Automation Appliances
• Point-of-Sale Terminals
• Outdoor Traffic and Street Lights
• Cameras

• VDD 1

• ADDR 2

• GND 3

• SDA 6

• INT 5

SCL

4

At TA = 25°C, VDD = 3.3 V, 800-ms conversion time (CT = 1) (1) , automatic full-scale range (RN[3:0] = 1100b (1) ), white LED, and normal-angle incidence of light, unless otherwise specified.

• (5) The conversion time, from start of conversion until the data are ready to be read, is the integration time plus 3 ms.

(6) The specified leakage current is dominated by the production test equipment limitations. Typical values are much smaller.

See (1)

Ambient light sensors are used in a wide variety of applications that require control as a function of ambient light. Because ambient light sensors nominally match the human eye spectral response, they are superior to photodiodes when the goal is to create an experience for human beings. Very common applications include display optical-intensity control and industrial or home lighting control.

There are two categories of interface to the OPT3001: electrical and optical.