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1. Description
2
The LTR-553ALS-WA is an integrated low voltage I C digital light sensor [ALS] and proximity sensor
[PS] with built-in emitter, in a single miniature chipled lead-free surface mount package. This sensor
2
converts light intensity to a digital output signal capable of direct I C 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-WA 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.
2. Features
I C 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 -30C to +70C
RoHS and Halogen free compliant
Light Sensor
Close to human eye spectral response
2
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
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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3. 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
4. Ordering Information
Part Number
Packaging Type
Package
Quantity
LTR-553ALS-WA
Tape and Reel
8-pins chipled package
5000
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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5. Outline Dimensions
Notes:
1. All dimensions are in millimeters
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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6. Functional Block Diagram
7. Application Circuit
LTR-553ALS
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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I/O Pins Configuration Table
Pin
I/O Type
Symbol
Description
1
I/O
SDA
I C serial data.
2
O
INT
Level Interrupt Pin. This pin is an open drain output.
3
I
LDR
LED Driver for proximity emitter.
4
O
LED K
LED Cathode. Connect to LDR pin if using internal LED driver circuit.
5
I
LED A
LED Anode. Connect to VDD or VBAT on PCB
GND
Ground
SCL
I C serial clock. This pin is an open drain input.
VDD
Power Supply Voltage
6
7
I
8
2
This pin is an open drain input / output.
This pin is an open drain input.
2
LTR-553ALS
Recommended Application Circuit Components
Component
Recommended Value
Rp1, Rp2, Rp3 [1]
1 k to 10 k
C1, C2
1uF 20%, X7R Ceramic
[1] Selection of pull-up resistors value is dependent on bus capacitance values. For more details, please
2
refer to I C Specifications: http://www.nxp.com/documents/user_manual/UM10204.pdf
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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8. Rating and Specification
Absolute Maximum Ratings at Ta = 25C
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
Supply Voltage
VDD
LED Supply Voltage
Min.
Typ.
Max.
Unit
2.4
3.6
V
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 = 25C, unless otherwise noted.
Parameter
Min.
Typ.
Active Supply Current
Standby Current
Initial Startup Time
60
100
Wakeup Time from
Standby
Max.
Unit
Condition
250
uA
Active Mode, Tope = 25C
5
uA
Standby / Sleep Mode
1000
ms
(Note 1)
10
ms
(Note 1)
Light Sensor
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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Parameter
Min.
Typ.
Max.
Unit
65535
count
0
6
count
Ch0, Lux = 0
0
6
count
Ch1, Lux = 0
count
count
Ch0, Lux = 200 (White LED)
Ch1, Lux = 200 (White LED)
Full Scale ADC Count
Condition
Dark ADC Count
ADC Count (Gain=96)
3200
1200
4900
1800
6600
2400
ALS Ratio
0.15
0.26
0.35
Ratio = Ch1/(Ch1 + Ch0),
Lux = 200 (White LED)
Dynamic Range (Gain=1)
1
64k
lux
White LED
Dynamic Range (Gain=2)
0.5
32k
lux
White LED
Dynamic Range (Gain=4)
0.25
16k
lux
White LED
Dynamic Range (Gain=8)
0.125
8k
lux
White LED
Dynamic Range (Gain=48)
0.02
1.3k
lux
White LED
Dynamic Range (Gain=96)
0.01
600
lux
White LED
Max.
Unit
Condition
2047
count
870
nm
Proximity Sensor
Parameter
Min.
Typ.
Full Scale ADC Count
Peak Sensitivity
840
Detection Distance
20
855
mm
100mA, 4 pulses, 18% Gray Card
50k
lux
Direct sunlight
1
15
pulses
LED Pulse Frequency
30k
100k
Hz
Increment of 10k Hz
LED Duty Cycle
25
100
%
Increment of 25%
Ambient Light Suppression
LED Pulse Count
5
mA
LED Peak Current = 000
10
mA
LED Peak Current = 001
20
mA
LED Peak Current = 010
50
mA
LED Peak Current = 011
100
mA
LED Peak Current = 1XX
LED Peak Current
Optical Rise / Fall Time
100
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
ns
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Notes:
1. Startup Sequence
Supply VDD to Sensor
(Sensor in Standby Mode)
Wait 100 ms (min) - initial startup time
I2C Command (Write)
To enable sensor to Active Mode
Wait 10 ms (max) - wakeup time from standby
Sensor is Active and starts measurement
LUX Formula
Refer to Appendix A
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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AC Electrical Characteristics
All specifications are at VBus = 1.8V, Tope = 25C, unless otherwise noted.
Parameter
Symbol
Min.
Max.
Unit
400
kHz
SCL clock frequency
f SCL
1
Bus free time between a STOP and START condition
t BUF
1.3
us
Hold time (repeated) START condition. After this period,
the first clock pulse is generated
t HD;STA
0.6
us
LOW period of the SCL clock
t LOW
1.3
us
HIGH period of the SCL clock
t HIGH
0.6
us
Set-up time for a repeated START condition
t SU ;STA
0.6
us
Set-up time for STOP condition
t SU ;STO
0.6
us
Rise time of both SDA and SCL signals
tr
30
300
ns
Fall time of both SDA and SCL signals
tf
30
300
ns
Data hold time
t HD;DAT
0.3
0.9
us
Data setup time
t SU ;DAT
100
Pulse width of spikes which must be suppressed by the
input filter
t SP
0
ns
50
ns
2
Definition of timing for I C bus
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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9. Principles of Operation
I2C Protocols
2
．I C Write Protocol (type 1):
1
7
1
1
8
1
1
S Slave address W
A
Register Address
A P
1
8
Slave ID (Write)
Slave ID (Write)
1
2
3
4
5
6
7
8
S
6
S
5
S
4
S
3
S
2
S
1
S
0
9
2
3
4
5
6
7
9
SCL
SDA
S
Slave address
A A A A A A A A
7 6 5 4 3 2 1 0
W A
Register Address
A
P
2
．I C Write Protocol (type 2):
1
7
1
1
8
1
S Slave address W
A
Register Address
8
1
1
A Register Command A P
Slave ID (Write)
Slave ID (Write)
1
2
3
4
5
6
7
8
S
6
S
5
S
4
S
3
S
2
S
1
S
0
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
SCL
SDA
S
A A A A A A A A
7 6 5 4 3 2 1 0
Slave address
W A
Register Address
A A A A A A A A
7 6 5 4 3 2 1 0
A
Register Command
A
P
2
．I C Read Protocol:
1
7
1
1
S Slave address R
8
1
1
A Register Command N P
Slave ID (Read)
Slave ID (Read)
1
2
3
4
5
6
7
S
6
S
5
S
4
S
3
S
2
S
1
S
0
8
9
1
2
3
4
5
6
7
8
9
SCL
SDA
S
Slave address
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
C C C C C C C C
7 6 5 4 3 2 1 0
R A
Register Command
N
P
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2
．I C Read (Combined format) Protocol:
1
7
1
1
8
1
S Slave address W
A
Register Address
1
7
A Sr Slave address
Slave ID (Write)
1
1
2
3
4
1
1
R
A Register Command N P
Slave ID (Read)
Slave ID (Write)
1
8
5
6
Slave ID (Read)
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
……
SCL
S
6
SDA
S
S
5
S
4
S
3
S
2
S
1
Slave address
S
0
A A A A A A A A
7 6 5 4 3 2 1 0
W A
Register Address
A
S
6
S
5
1
2
Sr
S
4
S
3
S
2
S
1
S
0
6
7
Slave address
3
4
5
……
R A
8
9
……
C C C C C C C C
7 6 5 4 3 2 1 0
……
A
A
S
P
W
Acknowledge (0 for an ACK)
Start condition
Register Command
N
P
N
Sr
Non-Acknowledge(1 for an NACK)
R
Read (1 for read)
Repeated Start condition
Stop condition
Write (0 for writing)
Slave-to-master
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
Master-to-Slave
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I2C Slave Address
The 7 bits slave address for this sensor is 0x23H.
A read/write bit should be appended to the slave
address by the master device to properly communicate with the sensor.
2
I C Slave Address
(0x23H)
W/R
Command
Type
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Write
0
1
0
0
0
1
1
0
0x46H
Read
0
1
0
0
0
1
1
1
0x47H
value
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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Register Set
Addr
R/W
Register Name
Description
Reset Value
0x80
R/W
ALS_CONTR
ALS operation mode control SW reset
0x00
0x81
R/W
PS_CONTR
PS operation mode control
0x00
0x82
R/W
PS_LED
PS LED setting
0x7F
0x83
R/W
PS_N_PULSES
PS number of pulses
0x01
0x84
R/W
PS_MEAS_RATE
PS measurement rate in active mode
0x02
0x85
R/W
ALS_MEAS_RATE
ALS measurement rate in active mode
0x03
0x86
R
PART_ID
Part Number ID and Revision ID
0x92
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_PS_STATUS
ALS and PS new data status
0x00
0x8D
R
PS_DATA_0
PS measurement data, lower byte
0x00
0x8E
R
PS_DATA_1
PS measurement data, upper byte
0x00
0x8F
R/W
INTERRUPT
Interrupt settings
0x00
0x90
R/W
PS_THRES_UP_0
PS interrupt upper threshold, lower byte
0xFF
0x91
R/W
PS_THRES_UP_1
PS interrupt upper threshold, upper byte
0x07
0x92
R/W
PS_THRES_LOW_0
PS interrupt lower threshold, lower byte
0x00
0x93
R/W
PS_THRES_LOW_1
PS interrupt lower threshold, upper byte
0x00
0x94
R/W
PS_OFFSET_1
PS offset, upper byte
0x00
0x95
R/W
PS_OFFSET_0
PS offset, lower byte
0x00
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 / PS Interrupt persist setting
0x00
Notes:
When reading ALS/PS 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).
When setting of INTERRUPT register (0x8F) is necessary, it should be done before the device is in Active mode.
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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ALS_CONTR Register (0x80)
The ALS_CONTR register controls the ALS Gain setting, 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,
2
the I C circuitry is always active. The default mode after power up is standby mode. During standby mode,
2
there is no ALS measurement performed but I C communication is allowed to enable read/write to all the
registers.
0x80
ALS_CONTR (default = 0x00)
B7
B6
B5
B4
B3
Reserved
ALS Gain
Field
Bits
Default
Type
Reserved
7:5
000
--
ALS Gain
4:2
000
RW
ALS mode
1
0
0
0
--
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
B0
SW
Reset
ALS
Mode
--
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
Reserved
110
Gain 48X 0.02 lux to 1.3k lux
111
Gain 96X 0.01 lux to 600 lux
Initial start-up procedure is
(default)
RW
RW
B1
Description
0
SW reset
B2
NOT
started
1
Initial start-up procedure is started, bit has
default value of 0 after start-up
0
Stand-by mode (default)
1
Active mode
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Property of Lite-On Only
PS_CONTR Register (0x81)
The PS_CONTR register controls the PS operation modes.
The PS sensor can be set to either standby
2
mode or active mode. At either of these modes, the I C circuitry is always active. The default mode after
2
power up is standby mode. During standby mode, there is no PS measurement performed but I C
communication is allowed to enable read/write to all the registers.
PS Gain controls the gain setting for the PS sensor.
PS Saturation Indicator Enable bit is used for enabling the saturation indicator in Bit 7 of PS_DATA register
(0x8E).
0x81
PS_CONTR (default = 0x00)
B7
B6
Reserved
B5
B4
PS
Saturation
Indicator
Enable
Reserved
Field
Bits
Default
Type
Reserved
7:6
00
--
PS
Saturation
Indicator
Enable
5
Reserved
4
PS Gain
3:2
0
1:0
00
B1
PS Gain
B0
PS Mode
Description
--
Must be 0
0
Saturation indicator disable
1
Saturation indicator enable
--
--
Must be 0
00
X16 (default)
RW
10
X32
X1
X64
00
PS Mode
B2
R/W
0
00
B3
RW
01
10
11
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
Stand-by mode (default)
Active mode
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PS_LED Register (0x82)
The PS_LED register controls the LED pulse modulation frequency, LED current duty cycle and LED peak
current.
0x82
PS_LED (default = 0x7F)
B7
B6
B5
B4
LED Pulse Frequency
Field
LED pulse
Modulation
Frequency
LED Current
DUTY
LED current
Bits
7:5
4:3
2:0
Default
011
11
111
Type
RW
RW
RW
LED Duty Cycle
B2
B1
B0
LED Peak Current
Description
000
001
010
011
100
LED pulse period = 30kHz
LED pulse period = 40kHz
LED pulse period = 50kHz
LED pulse period = 60kHz (default)
LED pulse period = 70kHz
101
110
111
00
01
10
11
LED pulse period = 80kHz
LED pulse period = 90kHz
LED pulse period = 100kHz
DUTY = 25%
DUTY = 50%
DUTY = 75%
000
001
010
011
100
101
110
111
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
B3
DUTY = 100% (default)
LED pulsed current level = 5mA
LED pulsed current level = 10mA
LED pulsed current level = 20mA
LED pulsed current level = 50mA
LED pulsed current level = 100mA (default)
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PS_N_Pulses Register (0x83)
The PS_N_Pulses register controls the number of LED pulses to be emitted.
0x83
PS_N_Pulses (default = 0x01)
B7
B6
B5
B4
B3
Reserved
Field
PS number of
LED pulses
Bits
Default
Type
7:4
0000
RW
3:0
0001
RW
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
B2
B1
B0
LED Pulse Count
Description
0000 (default)
RESERVED (Write only 0000)
0000
0001
0010
0011
RESERVED
0100
0101
0110
0111
1000
1001
1010
Number of pulses = 4
Number of pulses = 5
Number of pulses = 6
Number of pulses = 7
Number of pulses = 8
Number of pulses = 9
Number of pulses = 10
1011
1100
1101
1110
1111
Number of pulses = 11
Number of pulses = 12
Number of pulses = 13
Number of pulses = 14
Number of pulses = 15
Number of pulses = 1 (default)
Number of pulses = 2
Number of pulses = 3
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PS_MEAS_RATE Register (0x84)
The PS_MEAS_RATE register controls the timing of the periodic measurements of the PS in active mode.
PS Measurement Repeat Rate is the interval between PS_DATA registers update.
0x84
PS_MEAS_RATE (default = 0x02)
B7
B6
B5
B4
B3
Reserved
B2
B0
PS Measurement Repeat Rate
Field
Bits
Default
Type
Reserved
7:4
0000
--
PS
measurement
rate
-0000
0001
0010
0011
-50ms
70ms
100ms (default)
200ms
3:0
0010
RW
0100
0101
0110
0111
1XXX
500ms
1000ms
Description
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
B1
2000ms
10ms
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Property of Lite-On Only
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 Integration Time must be set to be equal or smaller than the ALS Measurement Repeat Rate. If ALS
Integration Time is set to be bigger than ALS Measurement Repeat Rate, it will be automatically reset to be
equal to ALS Measurement Repeat Rate by the IC internally.
0x85
ALS_MEAS_RATE (default = 0x03)
B7
B6
B5
Reserved
Bits
Default
Type
Reserved
7:6
00
--
ALS
integration
time
5:3
000
RW
2:0
B3
ALS Integration Time
Field
ALS
measurement
rate
B4
011
B1
B0
ALS Measurement Repeat Rate
Description
RW
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
B2
-000
001
010
-100ms (default)
50ms
200ms
011
100
101
110
111
000
001
400ms
150ms
250ms
300ms
350ms
50ms
100ms
010
011
100
101
110
111
200ms
500ms (default)
1000ms
2000ms
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Property of Lite-On Only
PART_ID Register (0x86) (Read Only)
The PART_ID register defines the part number and revision identification of the sensor.
0x86
PART_ID (default = 0x92)
B7
B6
B5
B4
B3
Part Number ID
B2
B1
B0
Revision ID
Field
Bits
Default
Type
Description
Part Number ID
7:4
1001
R
--
Revision ID
3:0
0010
R
--
MANUFAC_ID Register (0x87) (Read Only)
The MANUFAC_ID register defines the manufacturer identification of the sensor.
0x87
MANUFAC_ID (default = 0x05)
B7
B6
B5
B4
B3
B2
B1
B0
Manufacturer ID
Field
Bits
Default
Type
Manufacturer ID
7:0
00000101
R
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
Description
Manufacturer ID (0x05H)
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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).
2
2
When the I C read operation starts, all four ALS data registers are locked until the I C 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
2
temporary registers and the ALS_DATA registers are updated as soon as there is no on-going I C 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.
0x88
ALS_DATA_CH1_0 (default = 0x00)
B7
B6
B5
B4
B3
B2
B1
B0
B1
B0
ALS Data Ch1 Low
0x89
ALS_DATA_CH1_1 (default = 0x00)
B7
B6
B5
B4
B3
B2
ALS Data Ch1 High
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
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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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.
0x8A
ALS_DATA_CH0_0 (default = 0x00)
B7
B6
B5
B4
B3
B2
B1
B0
B1
B0
ALS Data Ch0 Low
0x8B
ALS_DATA_CH0_1 (default = 0x00)
B7
B6
B5
B4
B3
B2
ALS Data Ch0 High
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
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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ALS_PS_STATUS Register (0x8C) (Read Only)
The ALS_PS_STATUS register stores the information about interrupt status and ALS and PS 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 and PS interrupt criteria are met. It will check if the ALS or PS
measurement data is outside of the range defined by the upper and lower threshold limits.
ALS Data Valid bit indicates the validity of the ALS data in Ch0 and Ch1.
0x8C
ALS_PS_STATUS (default = 0x00)
B7
B6
ALS
Data
Valid
B5
B4
ALS Gain
Field
Bits
Default
Type
ALS Data
Valid
7
0
R
ALS Data
Gain Range
6:4
000
R
ALS interrupt
status
3
0
R
ALS data
status
2
0
R
PS interrupt
status
1
0
R
PS data
status
0
0
R
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
B3
B2
B1
B0
ALS
Interrupt
Status
ALS
Data
Status
PS
Interrupt
Status
PS Data
Status
Description
0
1
000
001
010
ALS Data is Valid (default)
ALS Data is Invalid
ALS measured data in Gain 1X (default)
ALS measured data in Gain 2X
ALS measured data in Gain 4X
011
100
101
110
111
0
1
ALS measured data in Gain 8X
Invalid
Invalid
ALS measured data in Gain 48X
ALS measured data in Gain 96X
interrupt signal INACTIVE (default)
interrupt signal ACTIVE
0
1
0
1
0
1
OLD data (data already read), (default)
NEW data (first time data is being read)
interrupt signal INACTIVE (default)
interrupt signal ACTIVE
OLD data (data already read), (default)
NEW data (first time data is being read)
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PS_DATA_0 Register (0x8D / 0x8E) (Read Only)
The PS ADC channel data are expressed as a 11-bit data spread over two registers. The PS_DATA_0 and
2
PS_DATA_1 registers provide the lower and upper byte respectively. When the I C read operation starts,
2
both the registers are locked until the I C read operation 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 PS_DATA registers are
2
updated as soon as there is no on-going I C read operation.
PS Saturation Flag is used for monitoring the internal IC saturation. It will be flagged when the IC has
reached saturation and not able to perform any further PS measurement. The PS Saturation Indicator
Enable bit in PS_CONTR Register (0x81) has to be enabled in order to use this feature. If it is not enable,
the flag will always be indicated as 0.
0x8D
PS_DATA_0 (default = 0x00)
B7
B6
B5
B4
B3
B2
B1
B0
B2
B1
B0
PS Data Low
0x8E
PS_DATA_1 (default = 0x00)
B7
B6
B5
PS
Saturation
Flag
B4
B3
Reserved
PS Data High
Field
Addr
Bits
Default
Type
PS Data, Low
0x8D
7:0
00000000
R
--
PS ADC lower byte data
PS Saturation Flag
0x8E
7
0
R
0
1
PS not saturated
PS saturated
Reserved
0x8E
6:3
00000
--
--
--
PS Data, High
0x8E
2:0
000
R
--
PS ADC upper byte data
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
Description
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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. However at
this condition, the ALS_PS_STATUS register will still be updated.
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.
0x8F
INTERRUPT (default = 0x00)
B7
B6
B5
B4
B3
Interrupt
Polarity
Reserved
Field
Bits
Default
Type
Reserved
7:3
00000
--
Interrupt
Polarity
Interrupt mode
2
1:0
0
00
B1
B0
Interrupt Mode
Description
RW
RW
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
B2
--
--
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
00
Interrupt pin is INACTIVE / high impedance state
(default)
01
Only PS measurement can trigger interrupt
10
Only ALS measurement can trigger interrupt
11
Both ALS and PS measurement can trigger
interrupt
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PS_THRES Register (0x90 / 0x91 / 0x92 / 0x93)
The PS_THRES_UP and PS_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 PS_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
PS_THRES must be the same as PS_DATA registers.
0x90
PS_THRES_UP_0 (default = 0xFF)
B7
B6
B5
B4
B3
B2
B1
B0
B1
B0
PS Upper Threshold Low
0x91
PS_THRES_UP_1 (default = 0x07)
B7
B6
B5
B4
B3
Reserved
0x92
B2
PS Upper Threshold High
PS_THRES_LOW _0 (default = 0x00)
B7
B6
B5
B4
B3
B2
B1
B0
B1
B0
PS Lower Threshold Low
0x93
PS_THRES_LOW_1 (default = 0x00)
B7
B6
B5
Reserved
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
B4
B3
B2
PS Lower Threshold High
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Field
Addr
Bits
Default
Type
Description
PS Upper Threshold
Low
0x90
7:0
11111111
RW
PS upper threshold lower byte
Reserved
0x91
7:3
00000
--
Reserved
PS Upper Threshold
High
0x91
2:0
111
RW
PS upper threshold upper byte
PS lower threshold,
Low
0x92
7:0
00000000
RW
PS lower interrupt threshold value,
lower byte
Reserved
0x93
7:3
00000
--
Reserved
PS lower threshold,
High
0x93
2:0
000
RW
PS lower interrupt threshold value,
upper byte
Part No.: LTR-553ALS-WA DATA SHEET
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PS_OFFSET Register (0x94 / 0x95)
The PS_OFFSET register defines the offset compensation value for proximity offsets caused by device
variations, optical crosstalk and other environment factors. This value will be used and cancelled from the
original PS raw data such that the data in PS_DATA register (0x8D and 0x8E) are the compensated value.
0x94
PS_OFFSET_1 (default = 0x00)
B7
B6
B5
B4
B3
B2
B0
PS Offset,
High byte
Reserved
0x95
B1
PS_OFFSET_0 (default = 0x00)
B7
B6
B5
B4
B3
B2
B1
B0
PS Offset, Low byte
Part No.: LTR-553ALS-WA DATA SHEET
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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
B1
B0
B1
B0
B1
B0
ALS Upper Threshold Low
0x98
ALS_THRES_UP_1 (default = 0xFF)
B7
B6
B5
B4
B3
B2
ALS Upper Threshold High
0x99
ALS_THRES_LOW _0 (default = 0x00)
B7
B6
B5
B4
B3
B2
ALS Lower Threshold Low
0x9A
ALS_THRES_LOW_1 (default = 0x00)
B7
B6
B5
B4
B3
B2
ALS Lower Threshold High
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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
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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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 interrupt.
0x9E
INTERRUPT PERSIST (default = 0x00)
B7
B6
B5
B4
B3
PS Persist
Field
Bits
Default
Type
PS persist
7:4
0000
RW
ALS persist
3:0
0000
RW
B1
B0
ALS Persist
Description
0000
0001
......
1111
0000
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
B2
0001
….
1111
Every PS value out of threshold range (default)
2 consecutive PS values out of threshold range
......
16 consecutive PS values out of threshold range
Every ALS value out of threshold range (default)
2 consecutive ALS values out of threshold range
….
16 consecutive ALS values out of threshold range
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10. Device Operation (using Interrupt)
Below flow diagram illustrates the LTR-553ALS-WA operation involving the use of Thresholds
and Interrupts.
Device
Power Up
Set Interrupt/
Thresholds
DPS Active
DLS Active
Wait for
Interrupt
No Interrupt
MCU
Actions
MCU
Actions
Interrupt
DPS
Interrupt
Read DPS
Data
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
Check Status
Reg (0x8C)
DLS
Interrupt
Read DLS
Data
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11. Pseudo Codes Examples
Control Registers
// The Control Registers define the operating modes and gain settings of the ALS and PS of LTR-553.
// Default settings are 0x00 for both registers (both in Standby mode).
Slave_Addr = 0x23
// Enable ALS
Register_Addr = 0x80
Command = 0x01
// Slave address of LTR-553 device
// ALS_CONTR register
// For Gain X1
// For Gain X2, Command = 0x05
// For Gain X4, Command = 0x09
// For Gain X8, Command = 0x0D
// For Gain X48, Command = 0x19
// For Gain X96, Command = 0x1D
WriteByte(Slave_Addr, Register_Addr, Command)
// Enable PS
Register_Addr = 0x81
Command = 0x03
// PS_CONTR register
// Gain = 16
// For Gain = 32, Command = 0x0B
// For Gain = 64, Command = 0x0F
WriteByte(Slave_Addr, Register_Addr, Command)
PS LED Registers
// The PS LED Registers define the LED pulse modulation frequency, duty cycle and peak current.
// Default setting is 0x7F (60kHz, 100%, 100mA).
Slave_Addr = 0x23
// Slave address of LTR-553 device
// Set LED Pulse Freq 30kHz (duty cycle 100%, peak curr 100mA)
Register_Addr = 0x82
// PS_LED register
Command = 0x1F
// Pulse Freq = 30kHz, (duty cyc 100%, peak curr 100mA)
// For Pulse Freq = 40kHz, (100%, 100mA), Command = 0x3F
// For Pulse Freq = 50kHz, (100%, 100mA), Command = 0x5F
// For Pulse Freq = 60kHz, (100%, 100mA), Command = 0x7F
// For Pulse Freq = 70kHz, (100%, 100mA), Command = 0x9F
// For Pulse Freq = 80kHz, (100%, 100mA), Command = 0xBF
// For Pulse Freq = 90kHz, (100%, 100mA), Command = 0xDF
// For Pulse Freq = 100kHz, (100%, 100mA), Command = 0xFF
WriteByte(Slave_Addr, Register_Addr, Command)
// Set LED Duty Cycle 25% (pulse freq 60kHz, peak curr 100mA)
Register_Addr = 0x82
// PS_LED register
Command = 0x67
// Duty Cycle = 25%, (pulse freq 60kHz, peak curr 100mA)
// For Duty Cycle = 50%, (60kHz, 100mA), Command = 0x6F
// For Duty Cycle = 75%, (60kHz, 100mA), Command = 0x77
// For Duty Cycle = 100%, (60kHz, 100mA), Command = 0x7F
WriteByte(Slave_Addr, Register_Addr, Command)
Part No.: LTR-553ALS-WA DATA SHEET
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// Set LED Peak Current 5mA (pulse freq 60kHz, duty cycle 100%)
Register_Addr = 0x82
// PS_LED register
Command = 0x78
// Peak Current = 5mA, (pulse freq 60kHz, duty cyc 100%)
// For Peak Current = 10mA, (60kHz, 100%), Command = 0x79
// For Peak Current = 20mA, (60kHz, 100%), Command = 0x7A
// For Peak Current = 50mA, (60kHz, 100%), Command = 0x7B
WriteByte(Slave_Addr, Register_Addr, Command)
PS Measurement Rate
// The PS_MEAS_RATE register controls the PS measurement rate.
// Default setting of the register is 0x02 (repeat rate 100ms)
Slave_Addr = 0x23
// Set PS Repeat Rate 50ms
Register_Addr = 0x84
Command = 0x00
// Slave address of LTR-553 device
// PS_MEAS_RATE register
// Meas rate = 50ms
// For Meas rate = 500ms, Command = 0x04
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 = 0x23
// Slave address of LTR-553 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 = 0x23
// Read back ALS_DATA_CH1
Register_Addr = 0x88
ReadByte(Slave_Addr, Register_Addr, Data0)
Register_Addr = 0x89
ReadByte(Slave_Addr, Register_Addr, Data1)
// Read back ALS_DATA_CH0
Register_Addr = 0x8A
ReadByte(Slave_Addr, Register_Addr, Data2)
Register_Addr = 0x8B
ReadByte(Slave_Addr, Register_Addr, Data3)
ALS_CH1_ADC_Data = (Data1 > 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)
PS Threshold Registers
// The PS_THRES_UP and PS_THRES_LOW registers determines the upper and
// lower limit of the interrupt threshold value.
// Following example illustrates the setting of the PS threshold window of
// decimal values of 200 (lower threshold) and 1000 (upper threshold)
Slave_Addr = 0x23
// Slave address of LTR-553 device
// Upper Threshold Setting (decimal 1000)
PS_Upp_Threshold_Reg_0 = 0x90
// PS Upper Threshold Low Byte Register address
PS_Upp_Threshold_Reg_1 = 0x91
// PS 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, PS_Upp_Threshold_Reg_0, Data0)
WriteByte(Slave_Addr, PS_Upp_Threshold_Reg_1, Data1)
// Lower Threshold Setting (decimal 200)
PS_Low_Threshold_Reg_0 = 0x92
// PS Lower Threshold Low Byte Register address
PS_Low_Threshold_Reg_1 = 0x93
// PS 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, PS_Low_Threshold_Reg_0, Data0)
WriteByte(Slave_Addr, PS_Low_Threshold_Reg_1, Data1)
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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12. Recommended Leadfree Reflow Profile
MAX 260C
T - TEMPERATURE (°C)
255
R3
230
217
200
180
R2
R4
60 sec to 90 sec
Above 217 C
150
R5
R1
120
80
25
0
P1
HEAT
UP
100
50
150
P2
SOLDER PASTE DRY
200
P3
SOLDER
REFLOW
250
P4
COOL DOWN
300
t-TIME
(SECONDS)
Process Zone
Symbol
T
Maximum T/time or Duration
Heat Up
P1, R1
25C to 150C
3C/s
Solder Paste Dry
P2, R2
150C to 200C
100s to 180s
P3, R3
200C to 260C
3C/s
P3, R4
260C to 200C
-6C/s
P4, R5
200C to 25C
-6C/s
Time maintained above liquidus point , 217C
> 217C
60s to 90s
Peak Temperature
260C
-
Time within 5C of actual Peak Temperature
> 255C
20s
Time 25C to Peak Temperature
25C to 260C
8mins
Solder Reflow
Cool Down
It is recommended to perform reflow soldering no more than twice.
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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13. Moisture Proof Packaging
All LTR-553ALS-WA 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
10C to 30C
Relative Humidity
Below 60% RH
Baking Conditions
Package
Temperature
Time
In Reels
60C
48 hours
In Bulk
100C
4 hours
Baking should only be done once.
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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14. Recommended Land Pattern and Metal Stencil Aperture
Stencil
Aperture
Land
Metal Stencil
Pattern
for Solder
Paste Printing
PCBA
Recommended Land Pattern
Note:
1. All dimensions are in millimeters
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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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 0.72mm x 0.60mm which has the same dimension as
the land pattern. This is to ensure adequate printed solder paste volume and yet no shorting.
Aperture
Opening
t
3.63
2.00
Note:
1. All dimensions are in millimeters
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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15. Package Dimension for Tape and Reel
Note:
1. All dimensions are in millimeters
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
Part No.: LTR-553ALS-WA DATA SHEET
BNS-OD-C131/A4 - Rev 1.0 – 22 May 2013
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