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LTR-553ALS-01 Integrated Low Voltage I2C Digital Light And Proximity Sensor

Post Date:

2018/12/13 17:38:03

Expired Date:

2019/03/13 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-553ALS-01 Ambient Light Sensor and Proximity Sensor Description

The LTR-553ALS-01 is an integrated low voltage I2C digital light sensor [ALS] and proximity sensor [PS] with built-in emitter, in a single 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. With built-in proximity sensor (emitter and detector), LTR-553ALS-01 offers the feature to detect object at a user configurable distance.


The sensor supports an interrupt feature that removes the need to poll the sensor for a reading which improves system efficiency. The sensor also supports several features that help to minimize the occurrence of false triggering. 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-553ALS-01 Ambient Light Sensor and Proximity 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
•   Proximity Sensor 
    - Built-in LED driver, emitter and detector
    - Programmable LED drive settings
    - 11-bit effective resolution
    - High ambient light suppression

LTR-553ALS-01 Ambient Light Sensor and Proximity 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-553ALS-01 Ambient Light Sensor and Proximity 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   4.35 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 Standb     10 ms (Note 1)

Light Sensor
Parameter Min. Min. Max. Unit Condition
Full Scale ADC Count     65535 count  
Dark ADC Count 0   6 count Ch0, Lux = 0
0   6 count Ch1, Lux = 0
ADC Count (Gain=8) 520   1070 count Ch0
White LED 200 Lux
Integration Time : 50ms
Measurement Time : 100ms
180   390 count Ch1
White LED 200 Lux
Integration Time : 50ms
Measurement Time : 100ms
ALS Ratio 0.15 0.26 0.35   Ratio = Ch1/(Ch1 + Ch0)
Lux = 200 (White LED)

Proximity Sensor
Parameter Min. Typ. Max. Unit Condition
Full Scale ADC Count     2047 count  
Peak Sensitivity 840 855 870 nm  
Detection Distance 20     nm 100mA, 4 pulses, 
18% Gray card
Ambient Light Suppression     50k Lux Direct sunlight
LED Pulse Count 1   15 Pulses  
LED Pulse Frequency 30k   100k Hz Increment of 10k Hz
LED Duty Cycle 25   100 % Increment of 25%
LED Peak Current   5   mA LED Peak Current = 000
  10   mA LED Peak Current = 001
  20   mA LED Peak Current = 010

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