Integrated I2C Digital Ambient Light and Proximity Sensor - LTR-553ALS-01

Product Specification

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, T_ope= 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