VEML7700
www.vishay.com
Vishay Semiconductors
High Accuracy Ambient Light Sensor with I2C Interface
FEATURES
• Package type: surface mount
• Package form: side view
• Dimensions (L x W x H in mm): 6.8 x 2.35 x 3
• Integrated modules: ambient light sensor (ALS)
• Supply voltage range VDD: 2.5 V to 3.6 V
• Communication via I2C interface
• Floor life: 72 h, MSL 4, according to J-STD-020
4
• Low shut down current consumption: typ. 0.5 μA
3
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
2
1
AMBIENT LIGHT FUNCTION
Pinning
• FiltronTM technology adaption: close to real human eye
response
1: SCL
• O-TrimTM technology adoption: ALS output tolerance
≤ 10 %
2: VDD
3: GND
• 16-bit dynamic range for ambient light detection from
0 lx to about 167 klx with resolution down to 0.005 lx/ct,
supports low transmittance (dark) lens design
4: SDA
DESCRIPTION
VEML7700 is a high accuracy ambient light digital 16-bit
resolution sensor in a miniature transparent 6.8 mm x
3.0 mm x 2.5 mm package. It includes a high sensitive photo
diode, a low noise amplifier, a 16-bit A/D converter and
supports an easy to use I2C bus communication interface.
• 100 Hz and 120 Hz flicker noise rejection
The ambient light result is as digital value available.
APPLICATIONS
• Excellent temperature compensation
• High dynamic detection resolution
• Software shutdown mode control
• Ambient light sensor for backlight dimming of e.g. TV
displays, smart phones, touch phones, PDA, GPS
• Ambient light sensor for industrial on- / off-lighting
operation
• Optical switch for consumer, computing, and industrial
devices and displays
PRODUCT SUMMARY
PART NUMBER
VEML7700
OPERATING
RANGE
(mm)
OPERATING
VOLTAGE
RANGE
(V)
I2C BUS
VOLTAGE
RANGE
(V)
AMBIENT
LIGHT RANGE
(lx)
AMBIENT
LIGHT
RESOLUTION
(lx)
OUTPUT
CODE
ADC RESOLUTION
PROXIMITY /
AMBIENT LIGHT
n/a
2.5 to 3.6
1.7 to 3.6
0 to 167 000
0.005
16 bit, I2C
- / 0.005
ORDERING INFORMATION
ORDERING CODE
PACKAGING
VOLUME (1)
REMARKS
VEML7700-TR
Tape and reel
MOQ: 2300 (MOQ is one reel)
Side view
VEML7700-TT
Tape and reel
MOQ: 2200 (MOQ is one reel)
Top view
Note
(1) MOQ: minimum order quantity
Rev. 1.0, 19-Nov-15
Document Number: 84286
1
For technical questions, contact: sensorstechsupport@vishay.com
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ABSOLUTE MAXIMUM RATINGS (Tamb = 25 °C, unless otherwise specified)
PARAMETER
SYMBOL
MIN.
MAX.
UNIT
Supply voltage
TEST CONDITION
VDD
0
4
V
Operation temperature range
Tamb
-25
+85
°C
Storage temperature range
Tstg
-25
+85
°C
Ptot
-
50
mW
Tj
-
100
°C
Tamb ≤ 25 °C
Total power dissipation
Junction temperature
BASIC CHARACTERISTICS (Tamb = 25 °C, unless otherwise specified)
PARAMETER
TEST CONDITION
SYMBOL
MIN.
TYP.
MAX.
VDD
2.5
3.3
3.6
V
VDD is 3.3 V
Isd
-
0.5
-
μA
VDD is 3.3 V, PSM = 11, refresh time 4100 ms
IDD
-
2
-
μA
VDD is 3.3 V, PSM = 00, refresh time 600 ms
IDD
-
μA
VDD is 3.3 V, PSM_EN = 0, refresh time 100 ms
IDD
Supply voltage
Shut down current (rem_2)
Operation mode current (rem_2)
I2C clock rate range
fSCL
10
UNIT
8
-
45
-
μA
-
400
kHz
I2C bus input H-level range
VDD is 3.3 V
Vih
1.3
-
3.6
V
I2C bus input L-level range
VDD is 3.3 V
Vil
-
-
0.4
V
Iol
3
-
?
mA
lx/step
Digital current out
(low, current sink)
Digital resolution (LSB count)
with ALS_SM = “01”
-
0.005
-
Detectable minimum illuminance
with ALS_SM = “01”
EV min.
-
0.01
-
lx
Detectable maximum illuminance
with ALS_SM = “10”
EV max.
-
167 000
-
lx
Dark offset (rem_2)
with ALS_SM = “01”
-
3
-
step
Note
• rem_1: light source: white LED
rem_2: light conditions: dark
CIRCUIT BLOCK DIAGRAM
VEML7700
SCL 1
Temperature
sensor
2
GND 3
Low pass
filter
Timing
controller
Output buffer
I2C interface
ALS-PD
VDD
Oscillator
SDA 4
Fig. 1 - Block Diagram
Rev. 1.0, 19-Nov-15
Document Number: 84286
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VEML7700
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BASIC CHARACTERISTICS (Tamb = 25 °C, unless otherwise specified)
120
100
100
Normalized Responsivity
Normalized Responsivity
120
VEML7700
80
60
V(λ)
40
20
80
60
40
20
0
0
400
500
600
700
800
900
1000
250 350 450 550 650 750 850 950 1050
λ - Wavelength (nm)
λ - Wavelength (nm)
Fig. 2 - Spectral Response
Fig. 3 - White Channel Sensitivity Spectrum
ALS sensitivity spectrum close to human eye photopic curve v(λ). Human eye curve adaption achieved by FiltronTM technology.
20°
1.0
0.9
40°
0.8
0.7
60°
0.6
ϕ - Angular Displacement
Srel - Relative Sensitivity
0°
80°
0.5 0.4 0.3 0.2 0.1 0
22308
Fig. 4 - Relative Radiant Sensitivity vs. Angular Displacement
120
nom. -10 %
nom.
Reading of ALS (klx)
100
80
nom. +10 %
60
40
20
0
0
20
40
60
80
100
120
Brightness Acc. Calibrated Luxmeter (klx)
Fig. 5 - ALS measurement deviation between different light sources: ≤ 10 %
Rev. 1.0, 19-Nov-15
Document Number: 84286
3
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APPLICATION INFORMATION
VEML7700 is a cost effective solution of ambient light sensor with I2C bus interface. The standard serial digital interface is easy
to access “Ambient Light Signal” without complex calculation and programming by external controller.
1. Application Circuit
2.5 V to 3.6 V
R3
10R
10 μF
1.7 V to 3.6 V
C1
C2
100 nF
R1
R2
VDD (2)
C1 and R3
are optional
for very
disturbed
supply
Host
Micro Controller
VEML7700
SDA (4)
I2C bus sata SDA
SCL (1)
I2C bus clock SCL
GND (3)
Fig. 6 - Application Diagram
Notes
• Proposed values for the pull-up resistor R1 and R2 should be > 1 kΩ, e.g. 2.2 kΩ to 4.7 kΩ.
For detailed description about set-up and use as well as more application related information see AN: “Designing VEML7700 into an
Application”.
2. I2C Interface
The VEML7700 contains actual six 16 bit command codes for operation control, parameter setup, and result buffering. All
registers are accessible via I2C communication. Figure 7 shows the basic I2C communication with VEML7700.
The built in I2C interface is compatible with I2C modes “standard” and “fast”: 10 kHz to 400 kHz.
I2C H-level range = 1.3 V to 3.6 V.
Please refer to the I2C specification from NXP for details.
Send byte
S
Write command to VEML7700
Slave address
Receive byte
S
Wr
A
Command code
A
Data byte (LSB)
A
Data byte (MSB)
A
P
Read data from VEML7700
Slave address
S = start condition
P = stop condition
A = acknowledge
N = no acknowledge
Wr
A
A
Command code
S
Slave address
Rd
A
Data byte (LSB)
A
Data byte (MSB)
N
P
Host action
VEML7700 response
Fig. 7 - Send Byte / Receive Byte Protocol
Register Addresses
VEML7700 has actual six user accessible 16 bit command
codes.
The addresses are 00h to 06h (03h not defined / reserved).
Device Address
The VEML7700 has a fix slave address for the host
programming and accessing selection.
The slave address (7 bit) is set to 0010000 = 0x10.
The least significant bit (LSB) defines read or write mode.
According 8 bit the bus address is then 0010 0000 = 20h for
write and 0010 0001 = 21h for read.
Rev. 1.0, 19-Nov-15
Auto-Memorization
VEML7700 can memorize the last ambient data before
shutdown and keep this data before waking up.
When VEML7700 is in shutdown mode, the host can freely
read this data via read command directly.
When VEML7700 wakes up, the data will be refreshed by
new detection.
Document Number: 84286
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Interrupt pin not available for VEML7700
COMMAND REGISTER FORMAT
COMMAND CODE
REGISTER NAME
BIT
00
reserved
15 : 13
Set 000b
W
ALS_SM
12 : 11
Sensitivity mode selection
00 = ALS sensitivity x 1
01 = ALS sensitivity x 2
10 = ALS sensitivity x (1/8)
11 = ALS sensitivity x (1/4)
W
reserved
10
R/W
Set 0b
W
9:6
ALS integration time setting
1100 = 25 ms
1000 = 50 ms
0000 = 100 ms
0001 = 200 ms
0010 = 400 ms
0011 = 800 ms
W
ALS_PERS
5:4
ALS persistence protect number setting
00 = 1
01 = 2
10 = 4
11 = 8
W
reserved
3:2
ALS_IT
Set 00b
W
W
W
ALS_INT_EN
1
ALS interrupt enable setting
0 = ALS INT disable
1 = ALS INT enable
ALS_SD
0
ALS shut down setting
0 = ALS power on
1 = ALS shut down
01
ALS_WH
02
ALS_WL
03
reserved
15 : 8
ALS high threshold window setting (MSB)
W
7:0
ALS high threshold window setting (LSB)
W
15 : 8
ALS low threshold window setting (MSB)
W
W
7:0
ALS low threshold window setting (LSB)
15 : 3
set 0000 0000 0000 0b
PSM
2:1
Power saving mode; see table “Refresh time”
00 = mode 1
01 = mode 2
10 = mode 3
11 = mode 4
W
PSM_EN
0
Power saving mode enable setting
0 = disable
1 = enable
W
15 : 8
MSB 8 bits data of whole ALS 16 bits
R
7:0
LSB 8 bits data of whole ALS 16 bits
R
15 : 8
MSB 8 bits data of whole WHITE 16 bits
R
7:0
LSB 8 bits data of whole WHITE 16 bits
R
15
ALS crossing low threshold INT trigger event
R
ALS_IF_H
14
ALS crossing high threshold INT trigger event
R
reserved
13 : 0
04
ALS
05
WHITE
ALS_IF_L
06
FUNCTION / DESCRIPTION
Note
• Command code 0 default value is 01 = devices is shut down
Rev. 1.0, 19-Nov-15
Document Number: 84286
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Command Code #0: Configuration Register
Register address = 00h
The command code #0 is for configuration of the ambient light measurements.
TABLE 1 - CONFIGURATION REGISTER #0
COMMAND CODE
REGISTER NAME
BIT
00
reserved
15 : 13
Set 000b
W
ALS_SM
12 : 11
Sensitivity mode selection
00 = ALS sensitivity x 1
01 = ALS sensitivity x 2
10 = ALS sensitivity x (1/8)
11 = ALS sensitivity x (1/4)
W
reserved
10
Set 0b
W
9:6
W
ALS_PERS
5:4
ALS persistence protect number setting
00 = 1
01 = 2
10 = 4
11 = 8
W
reserved
3:2
Set 00b
W
W
W
ALS_INT_EN
1
ALS interrupt enable setting
0 = ALS INT disable
1 = ALS INT enable
ALS_SD
0
ALS shut down setting
0 = ALS power on
1 = ALS shut down
01
ALS_WH
02
ALS_WL
15 : 8
ALS high threshold window setting (MSB)
W
7:0
ALS high threshold window setting (LSB)
W
15 : 8
ALS low threshold window setting (MSB)
W
W
7:0
ALS low threshold window setting (LSB)
15 : 8
MSB 8 bits data of whole ALS 16 bits
R
7:0
LSB 8 bits data of whole ALS 16 bits
R
reserved
3:2
Set 00b
R
ALS_IF_L
15
ALS crossing low threshold INT trigger level
R
ALS_IF_H
14
ALS crossing high threshold INT trigger level
R
reserved
13 : 0
04
ALS
06
R/W
ALS integration time setting
1100 = 25 ms
1000 = 50 ms
0000 = 100 ms
0001 = 200 ms
0010 = 400 ms
0011 = 800 ms
ALS_IT
05
FUNCTION / DESCRIPTION
Note
• Light level [lx] is (OUTPUT DATA [dec.] / ALS sensitivity) x (10 / IT [ms]). Please study also the application note.
Command Code #1: High Threshold Windows Setting
Command code address = 01h. Once enable INT function and use high / low windows threshold, bit 15:0 provides 16 bit register
for high bound threshold windows setting.
TABLE 2 - HIGH THRESHOLD WINDOWS SETTING #1
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Description
ALS high threshold window setting (15:8 MSB 8 bits of whole 16 bits)
ALS high threshold window setting (7:0 LSB 8 bits of whole 16 bits)
Rev. 1.0, 19-Nov-15
Document Number: 84286
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Command Code #2: Low Threshold Windows Setting
Command code address = 02h. Once enable INT function and use high / low windows threshold, bit 15:0 provides 16 bit register
for low bound threshold windows setting.
TABLE 3 - LOW THRESHOLD WINDOWS SETTING #2
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Description
ALS low threshold window setting (15:8 MSB 8 bits of whole 16 bits)
ALS low threshold window setting (7:0 LSB 8 bits of whole 16 bits)
Command Code #3: reserved
Command Code #4: ALS High Resolution Output Data
Command code address = 04h. To access 16 bit high resolution ALS output, it is suitable to follow read protocol to read from
command code 04 16 bits register.
TABLE 4 - ALS HIGH RESOLUTION OUTPUT DATA #4
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Description
ALS high resolution output data (15 : 8 MSB 8 bits of whole 16 bits)
ALS high resolution output data (7 : 0 LSB 8 bits of whole 16 bits)
Command Code #5: White Channel Output Data
Command code address = 05h. To access 16 bit WHITE output, it is suitable to follow read protocol to read from command
code 05 16 bits register.
TABLE 5 - WHITE CHANNEL OUTPUT DATA #5
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Description
WHITE output data (15 : 8 MSB 8 bits of whole 16 bits)
WHITE output data (7 : 0 LSB 8 bits of whole 16 bits)
Command Code #6: Interrupt Status
Command code address = 06h. Bit 15 defines interrupt flag while trigger occurred due to data crossing low threshold windows.
Bit 14 defines interrupt flag while trigger occurred due to data crossing high threshold windows.
TABLE 6 - INTERRUPT STATUS #6
Bit 15
Bit 14
int_th_low
int_th_high
Bit 13 to 0
reserved
Description
int_th_low
R bit. Indicated a low threshold exceed
int_th_high
R bit. Indicated a high threshold exceed
Rev. 1.0, 19-Nov-15
Document Number: 84286
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REFRESH TIME DETERMINATION OF PSM
VEML7700’s refresh time can be determined by PSM and ALS_IT setting in power saving mode (PSM). Cooperating with the
command register setting, the designer has a flexible method in defining the timing, power consumption, and sensitivity for light
data collection.
REFRESH TIME, IDD, AND SENSITIVITY RELATION
ALS_SM
01
01
01
01
01
01
01
01
01
01
01
01
01
01
01
01
PSM
00
01
10
11
00
01
10
11
00
01
10
11
00
01
10
11
ALS_IT
0000
0000
0000
0000
0001
0001
0001
0001
0010
0010
0010
0010
0011
0011
0011
0011
REFRESH TIME (ms)
600
1100
2100
4100
700
1200
2200
4200
900
1400
2400
4400
1300
1800
2800
4800
IDD (μA)
8
5
3
2
13
8
5
3
20
13
8
5
28
20
13
8
SENSITIVITY (lx/bit)
0.042
0.042
0.042
0.042
0.021
0.021
0.021
0.021
0.010
0.010
0.010
0.010
0.005
0.005
0.005
0.005
PACKAGE DIMENSIONS in millimeters
Rev. 1.0, 19-Nov-15
Document Number: 84286
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3.6
0.3
TAPING SIDE VIEW (-TR VERSION) in millimeters
16
1.75
7.5
Ø 1.5
4
Direction of feed
8
2
Ø 1.5
Drawing-No.: 9.700-5342.01-4
Issue: 2; 12.06.13
Rev. 1.0, 19-Nov-15
technical drawings
according to DIN
specifications
Document Number: 84286
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TAPING TOP VIEW (-TT VERSION) in millimeters
0.3
2.7
4°
7.1
16
7.5
3.3
4°
1.75
Ø 1.5
Direction of feed
4
8
2
Ø 1.5 min.
technical drawings
according to DIN
specifications
Drawing-No.: 9.700-5341.01-4
Issue: 2: 23.03.09
21666
Rev. 1.0, 19-Nov-15
Document Number: 84286
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REEL DIMENSIONS in millimeters
16734
LEADER AND TRAILER DIMENSIONS in millimeters
Trailer
no devices
Leader
devices
no devices
End
Start
min. 200
min. 400
96 11818
Rev. 1.0, 19-Nov-15
Document Number: 84286
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REFLOW SOLDER PROFILE
DRYPACK
300
Temperature (°C)
max. 260 °C
245 °C
255 °C
240 °C
217 °C
250
FLOOR LIFE
200
max. 30 s
Floor life (time between soldering and removing from MBB)
must not exceed the time indicated on MBB label:
150
max. 100 s
max. 120 s
Floor life: 72 h
100
max. ramp down 6 °C/s
50
max. ramp up 3 °C/s
0
50
100
150
200
250
300
Time (s)
Fig. 8 - Lead (Pb)-free Reflow Solder Profile
according to J-STD-020
Rev. 1.0, 19-Nov-15
Conditions: Tamb < 30 °C, RH < 60 %
Moisture sensitivity level 4, according to J-STD-020.
0
19841
Devices are packed in moisture barrier bags (MBB) to
prevent the products from moisture absorption during
transportation and storage. Each bag contains a desiccant.
DRYING
In case of moisture absorption devices should be baked
before soldering. Conditions see J-STD-020 or label.
Devices taped on reel dry using recommended conditions
192 h at 40 °C (+ 5 °C), RH < 5 %.
Document Number: 84286
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