LTR-329

Digital Light Sensor

The LTR-329 is a digital light sensor from LITEON. View the full LTR-329 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.

Official LTR-329 datasheet (PDF) — the source this page was extracted from.

Manufacturer

LITEON

LTR-329 Key Specifications

Parameter	Value
Mounting Type	Surface Mount
Operating Temperature	-30°C ~ 70°C
Output Type	I2C
Package / Case	4-VDFN
Packaging	MouseReel
Proximity Detection	No
Standard Pack Qty	3500
Supplier Device Package	4-Pin ChipLED
Type	Ambient
Supply Voltage	2.4V ~ 3.6V

LTR-329 Overview

Part: LTR-329ALS-01 — LITE-ON DCC

Type: Digital Light Sensor (ALS)

Description: A low voltage I2C digital light sensor in a miniature chipled lead-free surface mount package, converting light intensity to a digital output signal with a linear response over a wide dynamic range from 0.01 lux to 64k lux.

Operating Conditions:

Supply voltage: 2.4V to 3.6V
Operating temperature: -30°C to +70°C
Interface Bus Power Supply Voltage: 1.7V to 3.6V

Absolute Maximum Ratings:

Max supply voltage: 3.8 V
Max digital output current: 20 mA (SCL, SDA, INT)
Max storage temperature: 100 °C

Key Specs:

Dynamic Range: 0.01 lux to 64k lux
Effective Resolution: 16-bit
I2C Clock Frequency: 1 kHz to 400 kHz
Active Supply Current: 250 μA (Max, Active Mode, T_ope = 25°C)
Standby Current: 5 μA (Max, Standby / Sleep Mode)
Initial Startup Time: 60 ms (Min) to 1000 ms (Max)
Wakeup Time from Standby: 10 ms (Max)
ALS Gain Settings: 1X, 2X, 4X, 8X, 48X, 96X

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
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

Applications:

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

Package:

4-pins chipled package

LTR-329 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-329 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-329 Electrical Characteristics

All specifications are at VBus = 1.8V, T ope = 25 C, unless otherwise noted.

Parameter	Symbol	Min.	Max.	Unit
SCL clock frequency	SCL f	1	400	kHz
Bus free time between a STOP and START condition	BUF t	1.3		us
Hold time (repeated) START condition. After this period, the first clock pulse is generated	STA HD t ;	0.6		us
LOW period of the SCL clock	LOW t	1.3		us
HIGH period of the SCL clock	HIGH t	0.6		us
Set-up time for a repeated START condition	STA SU t ;	0.6		us
Set-up time for STOP condition	STO SU t ;	0.6		us
Rise time of both SDA and SCL signals	r t	30	300	ns
Fall time of both SDA and SCL signals	f t	30	300	ns
Data hold time	DAT HD t ;	0.3	0.9	us
Data setup time	DAT SU t ;	100		ns
Pulse width of spikes which must be suppressed by the input filter	SP t	0	50	ns

Definition of timing for I 2 C bus

Definition of timing for I 2 C bus

LTR-329 Absolute Maximum Ratings

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	T stg	-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.

LTR-329 Recommended Operating Conditions

Description	Symbol	Min.	Max.	Unit
Supply Voltage	VDD	2.4	3.6	V
LED Supply Voltage	VLED	2.5	4.35	V
Interface Bus Power Supply Voltage	V IO	1.7	3.6	V
Operating Temperature	T ope	-30	70	C

LTR-329 Typical Application

LTR-329 Package Information

Variants on the same datasheet

These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.

Part Number	Manufacturer	Package
LTR-329ALS	LITEON	ChipLED-4
LTR-329ALS-01	LITEON	4-VDFN

More datasheets

All LITEON datasheets (4)

Data on this page is extracted from publicly available manufacturer datasheets using automated tools including AI. It may contain errors or omissions. Always verify specifications against the official manufacturer datasheet before making design or purchasing decisions. See our Terms of Service. Rights holders can submit a takedown request.

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