LTR-303ALS-01 - Lite-On - Datasheet.Live

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BNS-OD-C131/A4 - Rev 1.1

Part Number

Packaging Type

Package

Quantity

LTR-303ALS-01

Tape and Reel

6-pin chipled package

2500

Description

The LTR-303ALS-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.

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-303ALS-01

Digital Ambient Light Sensor

Features

 I2C interface (Fast Mode @ 400kbit/s)

 Ultra-small 6-pin ChipLED package

2.0mm(L), 2.0mm(B), 0.7mm(H)

 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

 Full dynamic range from 0.01 lux to 64k lux

 16-bit effective resolution

Applications

 Back-lighting Control in mobile/portable devices

 Touch Panel Control in mobile/portable devices

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BNS-OD-C131/A4 - Rev 1.1

1. Outline Dimensions

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BNS-OD-C131/A4 - Rev 1.1

2. Functional Block Diagram

3. Application Circuit

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BNS-OD-C131/A4 - Rev 1.1

I/O Pins Configuration Table

I/O Type

Symbol

Description

1

VDD

Power Supply Voltage

2

NC

No connection to this pin

3

GND

Ground

4

I

SCL*

I2C serial clock. This pin is an open drain input.

5

O

INT*

Level Interrupt Pin. This pin is an open drain output.

6

I/O

SDA*

I2C serial data. This pin is an open drain input / output.

* Note: For noisy environment, add 10pF capacitor from signal to GND for additional noise filtering.

Recommended Application Circuit Components

Component

Recommended Value

Rp1, Rp2, Rp3 [1]

1 k to 10 k

C1

1uF 20%, X7R / X5R Ceramic

[1] Selection of pull-up resistors value is dependent on bus capacitance values. For more details, please

refer to I2C Specifications: http://www.nxp.com/documents/user_manual/UM10204.pdf

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BNS-OD-C131/A4 - Rev 1.1

4. Rating and Specification

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

Interface Bus Power Supply

Voltage

VIO

1.7

3.6

V

I2C Bus Input Pin High

Voltage

VIH SCL,

VIH SDA

1.2

V

I2C Bus Input Pin Low Voltage

VIL SCL,

VIL SDA

0.6

V

Operating Temperature

Tope

-30

70

C

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BNS-OD-C131/A4 - Rev 1.1

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

220

uA

Active Mode

Tope = 25C, VDD=3.6V

Integration Time : 100ms

Measurement rate : 200ms

Standby Current

5

uA

Standby / Sleep Mode

Initial Startup Time

100

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

Dark ADC Count

0

6

count

Ch0, Lux = 0

0

6

count

Ch1, Lux = 0

ADC Count (Gain = 96X)

@200Lux

3250

6100

count

Ch0

(see note 2)

white LED 200 Lux

Integration Time : 50ms

Measurement Time : 100ms

1050

1950

count

Ch1

(see note 2)

White LED 200 Lux

Integration Time : 50ms

Measurement Time : 100ms

0.15

0.35

Ratio

Ch1/(Ch0 + Ch1)

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BNS-OD-C131/A4 - Rev 1.1

Notes:

1. Startup Sequence

2. LiteOn white LED color temperature 10000K.

Supply VDD to Sensor

(Sensor in Standby Mode)

I2C Command (Write)

To enable sensor to Active Mode

Wait at least 100 ms - initial startup time

Sensor is Active and starts measurement

Wait at least 10 ms - wakeup time from standby

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BNS-OD-C131/A4 - Rev 1.1

Typical Performance Curve

All specifications are at VDD = 3.0V, Tope = 25C, unless otherwise noted.

Figure 1: Normalized Spectral Response

Figure 2 : Viewing angle

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BNS-OD-C131/A4 - Rev 1.1

Figure 3 : Vdd versus Average Idd

Figure 4 : Average Idd versus temperature

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BNS-OD-C131/A4 - Rev 1.1

Figure 5 : Output count ratio versus temperature

Lux Formula

Refer to Appendix A for the lux formula

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BNS-OD-C131/A4 - Rev 1.1

AC Electrical Characteristics

All specifications are at VBus = 1.8V, Tope = 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

STAHD

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

STASU

t;

0.6

us

Set-up time for STOP condition

STOSU

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

DATHD

t;

0.3

0.9

us

Data setup time

DATSU

t;

100

ns

Pulse width of spikes which must be suppressed by the

input filter

SP

t

0

50

ns

Definition of timing for I2C bus

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BNS-OD-C131/A4 - Rev 1.1

5. Principles of Operation

I2C Protocols

．I2C Write Protocol (type 1):

Slave address W AS Register Address A P

7 1 11 8 1 1

Slave ID (Write)

SCL

123456789

SDA S

6S

5S

4S

3S

2S

1S

0

123456789

A

7A

6A

5A

4A

3A

2A

1A

0

Slave address Register AddressA AS PW

Slave ID (Write)

．I2C Write Protocol (type 2):

Slave address W AS Register Address A P

7 1 11 8 1 1

Register Command A

8 1

Slave ID (Write)

SCL

123456789

SDA S

6S

5S

4S

3S

2S

1S

0

123456789

A

7A

6A

5A

4A

3A

2A

1A

0

Slave address Register AddressA AS

123456789

A

7A

6A

5A

4A

3A

2A

1A

0

Register Command A PW

Slave ID (Write)

．I2C Read Protocol:

S

1

Slave address R A N

7 1 1 8 1

Register Command P

1

Slave ID (Read)

SCL

123456789

SDA S

6S

5S

4S

3S

2S

1S

0

123456789

C

7C

6C

5C

4C

3C

2C

1C

0

Slave address Register CommandA NS PR

Slave ID (Read)

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BNS-OD-C131/A4 - Rev 1.1

．I2C Read (Combined format) Protocol:

Slave address W AS Register Address A Sr

7 1 11 8 1 1

Slave address R A N

7 1 1 8 1

Register Command P

1

Slave ID (Write) Slave ID (Read)

SCL

123456789

SDA S

6S

5S

4S

3S

2S

1S

0

123456789

A

7A

6A

5A

4A

3A

2A

1A

0

Slave address Register AddressA AS SrW

123456789

C

7C

6C

5C

4C

3C

2C

1C

0

Register CommandA N P

123456789

S

6S

5S

4S

3S

2S

1S

0

Slave address AR

……

Slave ID (Write) Slave ID (Read)

A

Acknowledge (0 for an ACK)

N

Non-Acknowledge(1 for an NACK)

S

Start condition

Sr

Repeated Start condition

P

Stop condition

W

Write (0 for writing)

R

Read (1 for read)

Slave-to-master

Master-to-Slave

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BNS-OD-C131/A4 - Rev 1.1

I2C Slave Address

The 7 bits slave address for this sensor is 0x29H. A read/write bit should be appended to the slave

address by the master device to properly communicate with the sensor.

I2C Slave Address

Command

Type

(0x29H)

W/R

value

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

Write

0

1

0

1

0

1

0

0x52H

Read

0

1

0

1

0

1

0x53H

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BNS-OD-C131/A4 - Rev 1.1

Register Set

Addr

R / W

Register Name

Description

Reset Value

0x80

R / W

ALS_CONTR

ALS operation mode control SW reset

0x00

0x85

R / W

ALS_MEAS_RATE

ALS measurement rate in active mode

0x01

0x86

R

PART_ID

Part Number ID and Revision ID

0xA0

0x87

R

MANUFAC_ID

Manufacturer ID

0x05

0x88

R

ALS_DATA_CH1_0

ALS measurement CH1 data, lower byte

0x00

0x89

R

ALS_DATA_CH1_1

ALS measurement CH1 data, upper byte

0x00

0x8A

R

ALS_DATA_CH0_0

ALS measurement CH0 data, lower byte

0x00

0x8B

R

ALS_DATA_CH0_1

ALS measurement CH0 data, upper byte

0x00

0x8C

R

ALS_STATUS

ALS new data status

0x00

0x8F

R / W

INTERRUPT

Interrupt settings

0x08

0x97

R / W

ALS_THRES_UP_0

ALS interrupt upper threshold, lower byte

0xFF

0x98

R / W

ALS_THRES_UP_1

ALS interrupt upper threshold, upper byte

0xFF

0x99

R / W

ALS_THRES_LOW_0

ALS interrupt lower threshold, lower byte

0x00

0x9A

R / W

ALS_THRES_LOW_1

ALS interrupt lower threshold, upper byte

0x00

0x9E

R / W

INTERRUPT PERSIST

ALS Interrupt persist setting

0x00

Notes:

1) When reading ALS data registers, read sequence should always be from lower address to higher address (E.g.

For ALS data, Ch1 data should be read first followed by Ch0 data. Read sequence should be 0x88, 0x89, 0x8A,

0x8B. When 0x8B is read, all four ALS data registers will be populated with new set of data).

2) When setting of INTERRUPT register (addr 0x8F) is necessary, it should be done before the device is in Active

mode.

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BNS-OD-C131/A4 - Rev 1.1

ALS_CONTR Register (0x80)

The ALS_CONTR register controls the ALS operation modes and software (SW) reset for the sensor.

The ALS sensor can be set to either standby mode or active mode. At either of these modes, the I2C

circuitry is always active. The default mode after power up is standby mode. During standby mode,

there is no ALS measurement performed but I2C communication is allowed to enable read/write to all

the registers.

Field

Bits

Default

Type

Description

Reserved

7:5

000

RW

000

MUST write to 000 (default)

ALS Gain

4:2

000

RW

000

Gain 1X  1 lux to 64k lux (default)

001

Gain 2X  0.5 lux to 32k lux

010

Gain 4X  0.25 lux to 16k lux

011

Gain 8X  0.125 lux to 8k lux

100

Reserved

101

110

Gain 48X  0.02 lux to 1.3k lux

111

Gain 96X  0.01 lux to 600 lux

SW reset

1

0

RW

0

Initial start-up procedure is NOT started (default)

1

Initial start-up procedure is started, bit has

default value of 0 after start-up

ALS mode

0

RW

0

Stand-by mode (default)

1

Active mode

0x80

ALS_CONTR (default = 0x00)

B7

B6

B5

B4

B3

B2

B1

B0

Reserved

ALS Gain

SW

Reset

ALS

Mode

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BNS-OD-C131/A4 - Rev 1.1

ALS_MEAS_RATE Register (0x85)

The ALS_MEAS_RATE register controls the integration time and timing of the periodic measurement of

the ALS in active mode. ALS Measurement Repeat Rate is the interval between ALS_DATA registers

update. ALS Integration Time is the measurement time for each ALS cycle.

ALS Measurement Repeat Rate must be set to be equal or larger than the ALS Integration Time. If ALS

Measurement Repeat Rate is set to be smaller than ALS Integration Time, it will automatically be reset

to be equal to ALS Integration Time by the IC internally.

Field

Bits

Default

Type

Description

Reserved

7:6

00

-

--

ALS

integration

time

5:3

000

RW

000

100ms (default)

001

50ms

010

200ms

011

400ms

100

150ms

101

250ms

110

300ms

111

350ms

ALS

measurement

rate

2:0

011

RW

000

50ms

001

100ms

010

200ms

011

500ms (default)

100

1000ms

101

2000ms

110

111

0x85

ALS_MEAS_RATE (default = 0x03)

B7

B6

B5

B4

B3

B2

B1

B0

Reserved

ALS Integration Time

ALS Measurement Repeat Rate

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BNS-OD-C131/A4 - Rev 1.1

PART_ID Register (0x86) (Read Only)

The PART_ID register defines the part number and revision identification of the sensor.

Function

Bits

Default

Type

Description

Part Number ID

7:4

1010

R

1010

Part ID 0x0AH

Revision ID

3:0

0000

R

0000

Revision ID 0x00H

MANUFAC_ID Register (0x87) (Read Only)

The MANUFAC_ID register defines the manufacturer identification of the sensor.

Field

Bits

Default

Type

Description

Manufacturer

ID

7:0

00000101

R

NA

Manufacturer ID 0x05

0x86

PART_ID (default = 0xA0)

B7

B6

B5

B4

B3

B2

B1

B0

Part Number ID

Revision ID

0x87

MANUFAC_ID (default = 0x05)

B7

B6

B5

B4

B3

B2

B1

B0

Manufacturer ID

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BNS-OD-C131/A4 - Rev 1.1

ALS_DATA_CH1 Register (0x88 / 0x89) (Read Only)

The ALS_DATA registers should be read as a group, with the lower address read back first (i.e. read

0x88 first, then read 0x89). These two registers should also be read before reading channel-0 data

(from registers 0x8A, 0x8B).

When the I2C read operation starts, all four ALS data registers are locked until the I2C read operation of

register 0x8B is completed. This will ensure that the data in the registers is from the same

measurement even if an additional integration cycle ends during the read operation. New

measurement data is stored into temporary registers and the ALS_DATA registers are updated as soon

as there is no on-going I2C read operation.

The ALS ADC channel-1 data is expressed as a 16-bit data spread over two registers. The

ALS_DATA_CH1_0 and ALS_DATA_CH1_1 registers provide the lower and upper byte respectively.

Field

Addr

Bits

Default

Type

Description

ALS Data Ch1

Low

0x88

7:0

00000000

R

ALS ADC channel 1 lower byte data

ALS Data Ch1

High

0x89

7:0

00000000

R

ALS ADC channel 1 upper byte data

0x88

ALS_DATA_CH1_0 (default = 0x00)

B7

B6

B5

B4

B3

B2

B1

B0

ALS Data Ch1 Low

0x89

ALS_DATA_CH1_1 (default = 0x00)

B7

B6

B5

B4

B3

B2

B1

B0

ALS Data Ch1 High

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BNS-OD-C131/A4 - Rev 1.1

ALS_DATA_CH0 Register (0x8A / 0x8B) (Read Only)

These two registers should be read after reading channel-1 data (from registers 0x88, 0x89). Lower

address register should be read first (i.e read 0x8A first, then read 0x8B). See ALS_DATA_CH1

register information above.

The ALS ADC channel-0 data is expressed as a 16-bit data spread over two registers. The

ALS_DATA_CH0_0 and ALS_DATA_CH0_1 registers provide the lower and upper byte respectively.

Field

Addr

Bits

Default

Type

Description

ALS Data Ch0

Low

0x8A

7:0

00000000

R

ALS ADC channel 0 lower byte data

ALS Data Ch0

High

0x8B

7:0

00000000

R

ALS ADC channel 0 upper byte data

0x8A

ALS_DATA_CH0_0 (default = 0x00)

B7

B6

B5

B4

B3

B2

B1

B0

ALS Data Ch0 Low

0x8B

ALS_DATA_CH0_1 (default = 0x00)

B7

B6

B5

B4

B3

B2

B1

B0

ALS Data Ch0 High

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BNS-OD-C131/A4 - Rev 1.1

ALS_STATUS Register (0x8C) (Read Only)

The ALS_STATUS register stores the information about interrupt status and ALS data status. New

data means data has not been read yet. When the measurement is completed and data is written to

the data register, the data status bit will be set to logic 1. When the data register is read, the data status

bit will be set to logic 0.

Interrupt status determines if the ALS interrupt criteria are met. It will check if the ALS measurement

data is outside of the range defined by the upper and lower threshold limits.

Field

Bits

Default

Type

Description

ALS Data

Valid

7

0

R

0

ALS Data is Valid (default)

1

ALS Data is Invalid

ALS Data

Gain Range

6:4

000

R

000

ALS measured data in Gain 1X (default)

001

ALS measured data in Gain 2X

010

ALS measured data in Gain 4X

011

ALS measured data in Gain 8X

100

Invalid

101

Invalid

110

ALS measured data in Gain 48X

111

ALS measured data in Gain 96X

ALS interrupt

status

3

0

R

0

interrupt signal INACTIVE (default)

1

interrupt signal ACTIVE

ALS data

status

2

0

R

0

OLD data (data already read), (default)

1

NEW data (first time data is read)

Reserved

1:0

00

R

--

Don’t care

0x8C

ALS_STATUS (default = 0x00)

B7

B6

B5

B4

B3

B2

B1

B0

ALS

Data

Valid

ALS Gain

ALS

Interrupt

Status

ALS

Data

Status

Reserved

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BNS-OD-C131/A4 - Rev 1.1

INTERRUPT Register (0x8F)

The INTERRUPT register controls the operation of the interrupt pin and functions. When the Interrupt

Mode is set to 00, the INT output pin 2 is inactive / disabled and will not trigger any interrupt.

Note that when this register is to be set with values other than its default values, it should be set before

device is in Active mode.

Field

Bits

Default

Type

Description

RESERVED

7:3

00001

--

Must write as 00000

Bit B3 is “1” (default) but it has no impact on

performance

Interrupt

Polarity

2

0

RW

0

INT pin is considered active when it is a logic 0

(default)

1

INT pin is considered active when it is a logic 1

Interrupt

mode

1

0

RW

0

Interrupt pin is INACTIVE / high impedance state

(default)

1

ALS measurement can trigger interrupt

RESERVED

0

--

Don’t care

0x8F

INTERRUPT (default = 0x08)

B7

B6

B5

B4

B3

B2

B1

B0

Reserved

Interrupt

Polarity

Interrupt

Mode

Reserved

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BNS-OD-C131/A4 - Rev 1.1

ALS_THRES Register (0x97 / 0x98 / 0x99 / 0x9A)

The ALS_THRES_UP and ALS_THRES_LOW registers determines the upper and lower limit of the

interrupt threshold value respectively. These two values form a range and the interrupt function

compares if the measurement value in ALS_DATA registers is inside or outside the range. The interrupt

function is active if the measurement data is outside the range defined by the upper and lower limits.

The data format for ALS_THRES must be the same as ALS_DATA registers.

0x97

ALS_THRES_UP_0 (default = 0xFF)

B7

B6

B5

B4

B3

B2

B1

B0

ALS Upper Threshold Low

0x98

ALS_THRES_UP_1 (default = 0xFF)

B7

B6

B5

B4

B3

B2

B1

B0

ALS Upper Threshold High

0x99

ALS_THRES_LOW _0 (default = 0x00)

B7

B6

B5

B4

B3

B2

B1

B0

ALS Lower Threshold Low

0x9A

ALS_THRES_LOW_1 (default = 0x00)

B7

B6

B5

B4

B3

B2

B1

B0

ALS Lower Threshold High

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BNS-OD-C131/A4 - Rev 1.1

Field

Addr

Bits

Default

Type

Description

ALS upper threshold

Low

0x97

7:0

11111111

RW

--

ALS upper threshold lower byte

ALS upper threshold

High

0x98

7:0

11111111

RW

--

ALS upper threshold upper byte

ALS lower threshold

Low

0x99

7:0

00000000

RW

--

ALS lower threshold lower byte

ALS lower threshold

High

0x9A

7:0

00000000

RW

--

ALS lower threshold upper byte

INTERRUPT PERSIST Register (0x9E)

The INTERRUPT PERSIST register controls the N number of times the measurement data is outside

the range defined by the upper and lower threshold limits before asserting the INT output pin 2.

Field

Bits

Default

Type

Description

Reserved

7:4

0000

RW

Don’t care

ALS persist

3:0

0000

RW

0000

Every ALS value out of threshold range (default)

0001

2 consecutive ALS values out of threshold range

….

1111

16 consecutive ALS values out of threshold range

0x9E

INTERRUPT PERSIST (default = 0x00)

B7

B6

B5

B4

B3

B2

B1

B0

Reserved

ALS Persist

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BNS-OD-C131/A4 - Rev 1.1

6. Device Operation (using Interrupt)

Below flow diagram illustrates the LTR-303ALS operation involving the use of Thresholds and

Interrupts.

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7. Device Operation (without using Interrupt)

Below flow diagram illustrates the LTR-303ALS operation without the use of interrupts.

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8. Pseudo Codes Examples

Control Registers

// The Control Register defines the operating modes and gain settings of the ALS of LTR-303.

// Default settings is 0x00 (in Standby mode).

Slave_Addr = 0x29 // Slave address of LTR-303 device

// Enable ALS

Register_Addr = 0x80 // ALS_CONTR register

Command = 0x01 // For Gain X1

// For Gain X96, Command = 0x1D

WriteByte(Slave_Addr, Register_Addr, Command)

ALS Measurement Rate

// The ALS_MEAS_RATE register controls the ALS integration time and measurement rate.

// Default setting of the register is 0x03 (integration time 100ms, repeat rate 500ms)

Slave_Addr = 0x29 // Slave address of LTR-303 device

// Set ALS Integration Time 200ms, Repeat Rate 200ms

Register_Addr = 0x85 // ALS_MEAS_RATE register

Command = 0x12 // Int time = 200ms, Meas rate = 200ms

// For Int time = 400ms, Meas rate = 500ms, Command = 0x1B

WriteByte(Slave_Addr, Register_Addr, Command)

ALS Data Registers (Read Only)

// The ALS Data Registers contain the ADC output data for the respective channel.

// These registers should be read as a group, with the lower address being read first.

Slave_Addr = 0x29 // Slave address of LTR-303 device

// Read back ALS_DATA_CH1

Register_Addr = 0x88 // ALS_DATA_CH1 low byte address

ReadByte(Slave_Addr, Register_Addr, Data0)

Register_Addr = 0x89 // ALS_DATA_CH1 high byte address

ReadByte(Slave_Addr, Register_Addr, Data1)

// Read back ALS_DATA_CH0

Register_Addr = 0x8A // ALS_DATA_CH0 low byte address

ReadByte(Slave_Addr, Register_Addr, Data2)

Register_Addr = 0x8B // ALS_DATA_CH0 high byte address

ReadByte(Slave_Addr, Register_Addr, Data3)

ALS_CH1_ADC_Data = (Data1 << 8) | Data0 // Combining lower and upper bytes to give 16-bit Ch1 data

ALS_CH0_ADC_Data = (Data3 << 8) | Data2 // Combining lower and upper bytes to give 16-bit Ch0 data

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BNS-OD-C131/A4 - Rev 1.1

ALS Status Register (Read only)

// The ALS_STATUS Register contains the information on Interrupt, ALS data availability status.

// This register is read only.

Slave_Addr = 0x29 // Slave address of LTR-303 device

// Read back Register

Register_Addr = 0x8C // ALS_STATUS register address

ReadByte(Slave_Addr, Register_Addr, Data)

Interrupt_Status = Data & 0x08 // Interrupt_Status = 8(decimal)  ALS Interrupt

NewData_Status = Data & 0x04 // NewData_Status = 4(decimal)  ALS New Data

ALS_Data_Valid = Data & 0x80 // ALS_Data_Valid = 0x00  ALS New Data is valid (usable)

// ALS_Data_Valid = 0x80  ALS New Data is invalid, discard and

wait for new ALS data

Interrupt Registers

// The Interrupt register controls the operation of the interrupt pins and function.

// The default value for this register is 0x08 (Interrupt inactive)

// Note that when this register is to be set with values other than its default values, it should be set before device is in

// active mode.

Slave_Addr = 0x29 // Slave address of LTR-303 device

// Set Interrupt Polarity for ALS Active Low trigger

Register_Addr = 0x8F // Interrupt Register address

Command = 0x0A // Interrupt is Active Low ALS trigger

// For Active High Interrupt ALS trigger, Command = 0x0E

WriteByte(Slave_Addr, Register_Addr, Command)

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BNS-OD-C131/A4 - Rev 1.1

ALS Threshold Registers

// The ALS_THRES_UP and ALS_THRES_LOW registers determines the upper and

// lower limit of the interrupt threshold value.

// Following example illustrates the setting of the ALS threshold window of

// decimal values of 200 (lower threshold) and 1000 (upper threshold)

Slave_Addr = 0x29 // Slave address of LTR-303 device

// Upper Threshold Setting (decimal 1000)

ALS_Upp_Threshold_Reg_0 = 0x97 // ALS Upper Threshold Low Byte Register address

ALS_Upp_Threshold_Reg_1 = 0x98 // ALS Upper Threshold High Byte Register address

Data1 = 1000 >> 8 // To convert decimal 1000 into two eight bytes register values

Data0 = 1000 & 0xFF

WriteByte(Slave_Addr, ALS_Upp_Threshold_Reg_0, Data0)

WriteByte(Slave_Addr, ALS_Upp_Threshold_Reg_1, Data1)

// Lower Threshold Setting (decimal 200)

ALS_Low_Threshold_Reg_0 = 0x99 // ALS Lower Threshold Low Byte Register address

ALS_Low_Threshold_Reg_1 = 0x9A // ALS Lower Threshold High Byte Register address

Data1 = 200 >> 8 // To convert decimal 200 into two eight bytes register values

Data0 = 200 & 0xFF

WriteByte(Slave_Addr, ALS_Low_Threshold_Reg_0, Data0)

WriteByte(Slave_Addr, ALS_Low_Threshold_Reg_1, Data1)

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BNS-OD-C131/A4 - Rev 1.1

9. Recommended Lead-free Reflow Profile

50 100 150 200 250 300

t-TIME

(SECONDS)

25

80

120

150

180

200

230

255

0

T - TEMPERATURE (°C)

R1

R2

R3 R4

R5

217

MAX 260C

60 sec to 90 sec

Above 217 C

P1

HEAT

UP

P2

SOLDER PASTE DRY P3

SOLDER

REFLOW

P4

COOL DOWN

Process Zone

Symbol

T

Maximum T/time or Duration

Heat Up

P1, R1

25C to 150C

3C/s

Solder Paste Dry

P2, R2

150C to 200C

100s to 180s

Solder Reflow

P3, R3

P3, R4

200C to 260C

260C to 200C

3C/s

-6C/s

Cool Down

P4, R5

200C to 25C

-6C/s

Time maintained above liquidus point , 217C

> 217C

60s to 90s

Peak Temperature

260C

-

Time within 5C of actual Peak Temperature

> 255C

20s

Time 25C to Peak Temperature

25C to 260C

8mins

It is recommended to perform reflow soldering no more than twice.

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10. Moisture Proof Packaging

All LTR-303ALS-01 are shipped in moisture proof package. Once opened, moisture absorption begins.

This part is compliant to JEDEC J-STD-033A Level 3.

Time from Unsealing to Soldering

After removal from the moisture barrier bag, the parts should be stored at the recommended storage

conditions and soldered within seven days. When the moisture barrier bag is opened and the parts are

exposed to the recommended storage conditions for more than seven days, the parts must be baked

before reflow to prevent damage to the parts.

Recommended Storage Conditions

Storage Temperature

10C to 30C

Relative Humidity

Below 60% RH

Baking Conditions

Package

Temperature

Time

In Reels

60C

48 hours

In Bulk

100C

4 hours

Baking should only be done once.

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11. Recommended Land Pattern and Metal Stencil Aperture

Recommended Land Pattern

Note: All dimensions are in millimeters

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BNS-OD-C131/A4 - Rev 1.1

Recommended Metal Stencil Aperture

It is recommended that the metal stencil used for solder paste printing has a thickness (t) of 0.11mm

(0.004 inches / 4 mils) or 0.127mm (0.005 inches / 5 mils).

The stencil aperture opening is recommended to be 0.3mm x 0.65mm which has the same dimension

as the land pattern. This is to ensure adequate printed solder paste volume and yet no shorting.

Note:

1. All dimensions are in millimeters

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12. Package Dimension for Tape and Reel

Notes:

1. All dimensions are in millimeters (inches)

2. Empty component pockets sealed with top cover tape

3. 7 inch reel - 2500 pieces per reel

4. In accordance with ANSI/EIA 481-1-A-1994 specifications

Mouser Electronics

Authorized Distributor

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LTR-303ALS-01