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LTR-329ALS-01 Low Voltage I2C Digital Ambient Light Sensor

Post Date:

2018/11/14 15:37:40

Expired Date:

2019/02/12 23:59:59

Trade Leads Category:


Company Info

Shenzhen Week Technology Ltd.
Contact Person: Yan Zhang
Address: 16 Floor, Building #3, Zhongke Mansion, Gaoxin South 1St Rd, Hi-Tech Park, Nanshan
State/Province: GUANGDONG
Country/Region: China (mainland)
Zip/Post Code: 518067


LTR-329ALS-01 Ambient Light Sensor Description
The LTR-329ALS-01 is a low voltage I2C digital light sensor [ALS] in a low cost miniature chipled lead-free surface mount package. This sensor converts light intensity to a digital output signal capable of direct I2C interface. It provides a linear response over a wide dynamic range from 0.01 lux to 64k lux and is well suited to applications under high ambient brightness. There are altogether six gain settings (1X, 2X, 4X, 8X, 48X and 96X) available for user to configure. 

This CMOS design and factory-set one time trimming capability ensure minimal sensor-to-sensor variations for ease of manufacturability to the end customers.

LTR-329ALS-01 Ambient Light Sensor Features
• I2C interface (Fast Mode @ 400kbit/s)
• Ultra-small ChipLED package
• Built-in temperature compensation circuit
• Low active power consumption with standby mode
• Supply voltage range from 2.4V to 3.6V capable of 1.7V logic voltage
• Operating temperature range from -30°C to +70°C
• RoHS and Halogen free compliant
•   Light Sensor 
    - Close to human eye spectral response
    - Immunity to IR / UV Light Source 
    - Automatically rejects 50 / 60 Hz lightings flicker
    - 6 dynamic range from 0.01 lux to 64k lux
    - 16-bit effective resolution

LTR-329ALS-01 Ambient Light Sensor Applications
To control display backlight in 
• Mobile Devices: Mobile phone, PDA
• Computing Devices: Notebook PC, Desktop Monitor
• Consumer Devices: LCD/PDP TV backlight systems, Cameras, Personal Navigation Device, 
• Digital Photo Frame
• Dashboard
LTR-329ALS-01 Ambient Light Sensor Ratings and Specifications
Absolute Maximum Ratings at Ta = 25°C

Parameter Symbol Rating Unit
Supply Voltage VDD 3.8 V
Digital Voltage Range SCL, SDA, INT -0.5 to 3.8 V
Digital Output Current SCL, SDA, INT -1 to 20 mA
Storage Temperature Tstg -40 to 100 °C
Note: Exceeding these ratings could cause damage to the sensor. All voltages are with respect to ground. Currents are positive into, negative out of the specified terminal.

Recommended Operating Conditions

Description Symbol Min. Typ. Max. Unit
Supply Voltage VDD 2.4   3.6 V
LED Supply Voltage VLED 2.5   4.36 V
Interface Bus Power Supply Voltage VIO 1.7   3.6 V
Operating Temperature Tope -30   70 °C

Electrical & Optical Specifications 
All specifications are at VDD = 3.0V, Tope= 25°C, unless otherwise noted.

Parameter Min. Typ. Max. Unit Condition
Active Supply Current     250 uA Active Mode, Tope= 25°C
Standby Current     5 uA Standby / Sleep Mode
Initial Startup Time 60 100 1000 ms (Note 1)
Wakeup Time from Standby     10 ms (Note 1)

Light Sensor
Parameter Min. Typ. Max. Unit Condition
Full Scale ADC Count     65535 count Full Scale ADC Count
Dark ADC Count 0   6 count Ch0, Lux = 0
0   6 count Ch1, Lux = 0
ADC Count (Gain=96)
Ch0, Lux = 200 (White LED)
Ch1, Lux = 200 (White LED)
Integration Time : 50ms
Measurement Time : 100ms
ALS Ratio 0.15   0.35 Ratio Ratio = Ch1/(Ch1 + Ch0),
Lux = 200 (White LED)

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