VEML3235
www.vishay.com
Vishay Semiconductors
Low Power, High Sensitivity, I2C Ambient Light Sensor
FEATURES
• Package type: surface-mount
• Dimensions (L x W x H in mm): 2 x 2 x 0.87
• Integrated modules: ambient light sensor (ALS)
• Supply voltage range VDD: 2.6 V to 3.6 V
• Communication via I2C interface
• I2C bus H-level range: 1.7 V to 3.6 V
• Floor life: 168 h, MSL 3, according to J-STD-020
• Low stand by current consumption: typ. 1 μA
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
APPLICATIONS
DESCRIPTION
• Handheld device
VEML3235 is an advanced ambient light sensor with I2C
protocol interface and is designed by the CMOS process. It
is easy to operate via a simple I2C command.
VEML3235 incorporates a photodiode, amplifiers, and
analog circuits in a single chip. The best spectral sensitivity
is used to closely capture real human eye responses.
VEML3235 has excellent temperature compensation and
the robust refresh rate setting does not need an external
RC low pass filter. Software shutdown mode is provided,
which reduces power consumption to be less than 1 μA.
VEML3235’s operating voltage ranges from 2.6 V to 3.6 V.
VEML3235 can detect a wide range of ambient light power.
• Notebook
• Consumer device
• Industrial and medical application
• Computing, and industrial devices and displays
AMBIENT LIGHT FUNCTION
• High ALS sensitivity with minimum detectable intensity of
0.0021 lx/cnt supports low transmittance lens design
• Excellent temperature compensation
• High dynamic detection resolution
• Software shutdown mode control
PRODUCT SUMMARY
PART NUMBER
VEML3235
OPERATING
VOLTAGE
RANGE
(V)
I2C BUS
VOLTAGE
RANGE
(V)
AMBIENT LIGHT
RANGE
(lx)
AMBIENT LIGHT
RESOLUTION
(lx)
OUTPUT
CODE
ADC RESOLUTION
PROXIMITY /
AMBIENT LIGHT
2.6 to 3.6
1.7 to 3.6
0.0021 to 17 867
0.0021
16 bit, I2C
- / 16 bit
ORDERING INFORMATION
ORDERING CODE
PACKAGING
VOLUME (1)
REMARKS
VEML3235
Tape and reel
MOQ: 3000
2.00 mm x 2.00 mm x 0.87 mm
Note
(1) MOQ: minimum order quantity
Rev. 1.3, 29-Mar-2023
Document Number: 80131
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
BASIC CHARACTERISTICS (Tamb = 25 °C, unless otherwise specified)
PARAMETER
TEST CONDITION
SYMBOL
MIN.
TYP.
MAX.
VDD
2.6
3.3
3.6
V
Isd
-
1
-
μA
Supply voltage
Shut down current (1)
VDD is 3.3 V
Supply current (1)
VDD is 3.3 V
IDD
-
250
-
μA
fSCL
10
-
400
kHz
VDD is 3.3 V
Vih
1.2
-
-
V
Vil
0
-
0.4
V
-
0.0021
-
lx/step
I2C clock rate range
I2C bus input H-level range
I2C
UNIT
bus input L-level range
VDD is 3.3 V
Digital resolution (LSB count) (2)
With DG = x 2, Gain = x 4
Detectable minimum illuminance (2)
With DG = x 2, Gain = x 4
EV min.
-
0.0021
-
lx
Detectable maximum illuminance (3)
With DG = x 1, Gain = x 1
EV max.
-
17 867
-
lx
Notes
(1) V
DD = 3.3 V, temperature: 25 °C
(2) IT = 800 ms
(3) IT = 50 ms
CIRCUIT BLOCK DIAGRAM
VEML3235
Temperature
compensation
WHITE
Integrating
ADC
Logic and timing
controller
VDD 6
2 SDA
I2C Interface
Integrating
ADC
Data
registers
SCL 5
ALS
3 NC
Command
registers
NC 4
1 GND
Oscillator
Fig. 1 - Block Diagram
Rev. 1.3, 29-Mar-2023
Document Number: 80131
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I2C TIMING CHARACTERISTICS (Tamb = 25 °C, unless otherwise specified)
PARAMETER
SYMBOL
Clock frequency
STANDARD MODE (1)
MIN.
MAX.
f(SMBCLK)
10
t(BUF)
4.7
t(HDSTA)
Repeated start condition setup time
Stop condition setup time
Data hold time
Data setup time
UNIT
MAX.
100
10
400
kHz
-
1.3
-
μs
4.0
-
0.6
-
μs
t(SUSTA)
4.7
-
0.6
-
μs
t(SUSTO)
4.0
-
0.6
-
μs
t(HDDAT)
-
3450
-
900
ns
Bus free time between start and stop condition
Hold time after (repeated) start condition;
after this period, the first clock is generated
FAST MODE (1)
MIN.
t(SUDAT)
250
-
100
-
ns
I2C clock (SCL) low period
t(LOW)
4.7
-
1.3
-
μs
I2C clock (SCL) high period
t(HIGH)
4.0
-
0.6
-
μs
Clock / data fall time
t(F)
-
300
-
300
ns
Clock / data rise time
t(R)
-
1000
-
300
ns
Note
(1) Data based on standard I2C protocol requirement, not tested in production
t(LOW)
2
t(R)
t(F)
VIH
I C bus
clock
(SCL)
VIL
t(HDSTA)
t(HIGH)
t(SUSTA)
t(SUSTO)
t(BUF)
t(HDDAT)
I2C bus
data
(SDA)
t(SUDAT)
VIH
Start
{
S
Start condition
{
P
Stop condition
{
{
VIL
S
P
Stop
t(LOSEXT)
SCLACK
t(LOWMEXT)
SDAACK
t(LOWMEXT)
t(LOWMEXT)
2
I C bus
clock
(SCL)
I2C bus
data
(SDA)
Fig. 2 - I2C Timing Diagram
Rev. 1.3, 29-Mar-2023
Document Number: 80131
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PARAMETER TIMING INFORMATION
I2C bus
clock
(SCL)
I2C bus
data
(SDA)
SA7
SA6
SA5
SA4
SA3
SA2
W
SA1
SA7
SA6
SA5
SA4
SA3
SA2
SA1
SA0
ACK
Start by
master
ACK
I2C bus slave address byte
Command code
I2C bus
clock
(SCL)
I2C bus
data
(SDA)
SA7
SA6
SA5
SA4
SA3
SA2
SA1
SA0
SA6
SA7
SA5
SA4
SA3
SA2
SA1
SA0
ACK
ACK
Data byte low
Stop by
master
Data byte high
Fig. 3 - I2C Bus Timing for Sending Word Command Format
I2C bus
clock
(SCL)
I2C bus
data
(SDA)
SA7
SA6
SA5
SA4
SA3
SA2
W
SA1
SA7
SA6
SA5
SA4
SA3
SA2
SA1
SA0
ACK
Start by
master
ACK
I2C bus slave address byte
Command code
I2C bus
clock
(SCL)
I2C bus
data
(SDA)
SA7
SA6
SA5
SA4
SA3
SA2
R
SA1
SA7
SA6
SA5
SA4
SA3
ACK
Start by
master
SA2
SA1
SA0
ACK by
master
I2C bus slave address byte
Data byte low
I2C bus
clock
(SCL)
I2C bus
data
(SDA)
SA7
SA6
SA5
SA4
SA3
SA2
SA1
SA0
NACK by
master
Stop by
master
Data byte high
Fig. 4 - I2C Bus Timing for Receive Word Command Format
Rev. 1.3, 29-Mar-2023
Document Number: 80131
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BASIC CHARACTERISTICS (Tamb = 25 °C, unless otherwise specified)
275
0.8
IDD - Supply Current, Active (µA)
Srel. - Relative Sensitivity
1.0
W
0.6
ALS
0.4
0.2
270
265
260
255
250
245
240
235
230
0
300
400
500
600
700
800
900 1000
-40
-20
0
20
40
60
80
100
Tamb - Ambient Temperature (°C)
λ - Wavelength (nm)
Fig. 5 - Relative Spectral Sensitivity vs. Wavelength
Fig. 7 - Supply Current vs. Ambient Temperature
1.1
Srel. - Relative Sensitivity
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-90
-60
-30
0
30
60
90
φ - Angular Displacement (°)
Fig. 6 - Relative Sensitivity vs. Angular Displacement
Rev. 1.3, 29-Mar-2023
Document Number: 80131
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APPLICATION INFORMATION
1. Pin Connection With the Host
VEML3235 is a cost effective solution with I2C interface. The standard serial digital interface easily accesses “light intensity”
without using complex calculations and programming by an external controller.
The additional capacitor near the VDD pin in the circuit is used for power supply noise rejection. The value is recommended at
0.1 μF. The pull-high resistors for the I2C bus design are recommended to be 2.2 kΩ.
1.7 V to 3.6 V
R1
R2
GND (1)
R4
2.6 V to 3.6 V
C1
10R
C2
VDD (6)
Host
micro controller
10 µF 100 nF
VEML3235
C1 and R4 are optional
for very disturbed supply
NC (3)
SDA (2)
I2C bus data SDA
SCL (5)
I2C bus clock SCL
NC (4)
Fig. 8 - Hardware Pin Connection Diagram (Slave Address 0x10)
Digital Interface
VEML3235 contains a command register written via the I2C bus. All operations can be controlled by the command register. The
simple command structure allows the user to easily program the operation setting and latch the light data from VEML3235.
VEML3235’s I2C command format description for read and write operations between VEML3235 and the host is shown in
Fig. 9. The white areas indicate the host activity and the gray areas indicate VEML3235’s acknowledgement of the host access
activity.
Send byte → write command to sensor
1
7
1
1
8
1
8
1
8
1
1
S
Slave address
Wr
A
Command code
A
Data byte low
A
Data byte high
A
P
Receive byte → read data from VEML3235
1
7
1
1
8
1
1
7
1
1
8
1
8
1
1
S
Slave address
Wr
A
Command code
A
S
Slave address
Rd
A
Data byte low
A
Data byte high
N
P
S = start condition
P = stop condition
A = acknowledge
N = not acknowledge
Host action
Sensor acknowledge
Fig. 9 - Command Protocol Format
Rev. 1.3, 29-Mar-2023
Document Number: 80131
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Command Register Format
VEML3235 uses 0x10 slave address for 7-bit I2C addressing protocol. VEML3235 has 16-bit resolution for each channel (ALS
and W).
TABLE 1 - COMMAND CODE DESCRIPTION
COMMAND
CODE
REGISTER NAME
DATE BYTE
LOW / HIGH
Reserved
7
0x04
0x05
0x09
Rev. 1.3, 29-Mar-2023
R/W
Set 0
6:4
Reserved
3:1
Set 0
SD
0
Shutdown BG and LDO with SD = 1 (default)
SD0
7
Shutdown ALS and white channel with SD0 = 1
(default)
Reserved
6
Set 0
DG
5
0 = x 1, 1 = x 2
L
Gain
4:3
(0 : 0) = x 1
(0 : 1) = x 2
(1 : 0) = reserved
(1 : 1) = x 4
Reserved
2:1
Set 0
Reserved
0
Set 1
H
0x02
FUNCTION DESCRIPTION
ALS/W integration time setting
(0 : 0 : 0) = 50 ms
(0 : 0 : 1) = 100 ms
(0 : 1 : 0) = 200 ms
(0 : 1 : 1) = 400 ms
(1 : 0 : 0) = 800 ms
ALS/W_IT
0x00
BIT
Reserved
L
7:0
Set 0
Reserved
H
7:0
Set 0
W_LSB
L
7:0
W LSB data
W_MSB
H
7:0
W MSB data
ALS_LSB
L
7:0
ALS LSB data
ALS_MSB
H
7:0
ALS MSB data
ID_L
L
7:0
ID part number: 3235 = 0011 0101
Reserved
H
7:0
Reserved
R/W
R
Document Number: 80131
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Data Access
VEML3235 has 16-bit high resolution sensitivity for each channel. To represent the 16-bit data, it has to apply two bytes. One
byte is for LSB and the other byte is for MSB. The host needs to follow the read word protocol. The data format shows as below.
TABLE 2 - 16-BIT DATA FORMAT
VEML3235 16-BIT DATA FORMAT
Data bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Data byte low
Data byte high
Note
Slave address
S
Wr
A
Command code
A
S
Slave address
Rd
A
Data byte low
A
Data byte high
N
P
• Data byte low represents LSB and data byte high represents MSB
The table below shows these dependencies:
RESOLUTION AND MAXIMUM DETECTION RANGE AT DG = 1
GAIN: x 4
IT (ms)
GAIN: x 2
GAIN: x 1
GAIN: x 4
TYPICAL RESOLUTION (lx/cnt)
GAIN: x 2
GAIN: x 1
MAXIMUM POSSIBLE ILLUMINATION (lx)
800
0.00426
0.00852
0.01704
279
558
1117
400
0.00852
0.01704
0.03408
558
1117
2233
200
0.01704
0.03408
0.06816
1117
2233
4467
100
0.03408
0.06816
0.13632
2233
4467
8934
50
0.06816
0.13632
0.27264
4467
8934
17 867
GAIN: x 4
GAIN: x 2
GAIN: x 1
RESOLUTION AND MAXIMUM DETECTION RANGE AT DG = 2
GAIN: x 4
IT (ms)
GAIN: x 2
GAIN: x 1
TYPICAL RESOLUTION (lx/cnt)
MAXIMUM POSSIBLE ILLUMINATION (lx)
800
0.00213
0.00426
0.00852
140
279
558
400
0.00426
0.00852
0.01704
279
558
1117
200
0.00852
0.01704
0.03408
558
1117
2233
100
0.01704
0.03408
0.06816
1117
2233
4467
50
0.03408
0.06816
0.13632
2233
4467
8934
Example:
If the 16-bit word of the ALS data shows: 0000 0101 1100 1000 = 1480 (dec.), the programmed Gain = x 1, the digital gain
DG = x 1 and the integration time is 100 ms, the corresponding lux level is: light level [lx] = 1480 x 0.13632 = 202 lx.
For detailed description about set-up and more application related information see application note: “Designing VEML3235 into
an Application”.
Rev. 1.3, 29-Mar-2023
Document Number: 80131
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PACKAGE INFORMATION in millimeters
(0.6)
0.87
2
Optical center
1
NC 4
3 NC
SCL 5
2 SDA
VDD 6
1 GND
1
2
Top view pinnning
2
Recommended footprint
1.6
0.65 (4 x)
0.35 (4 x)
Pin 1
marking
0.3 (6 x)
0.55 (6 x)
2.3
0.45 (6 x)
0.4 (6 x)
Technical drawings
according to DIN
specification.
Drawing No.: AK-20.0014.00
Not indicated tolerances ± 0.1
Issue: preliminary 28.02.2019
Fig. 10 - VEML3235 A3OZ Package Dimensions
Rev. 1.3, 29-Mar-2023
Document Number: 80131
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TAPE AND REEL DIMENSIONS in millimeters
8.4 +2.5
Ø 177.8 max.
Ø 55 min.
8.4 +0.15
Z
14.4 max.
Form of the leave open of the wheel is supplier specific.
Ø20.2 min.
1.5 min.
+0.5
Ø13 -0.2
Z 2:1
Technical drawings
according to DIN
specification.
Drawing-No.: 9.800-5096.01-4
Issue: 5; 20.12.2016
Fig. 11 - 7" Reel, 3000 Pieces
Rev. 1.3, 29-Mar-2023
Document Number: 80131
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100 min.
330 max.
Y
Label
Z
Form of the leave open
of the wheel is supplier specific.
unreel direction
14.4 max.
8.4 +- 2.5
0
Z(2:1)
Y(1:1)
Ø 20.2 min.
1.5
mi
n.
Ø 13 +- 0.5
0.2
Drawing-No.: 9.800-5140.01-4
Issue: prel. 1; 02.03.2016
Technical drawings
according to DIN
specification.
8.4 +- 0.15
0
Fig. 12 - 13" Reel, 10 000 Pieces
Rev. 1.3, 29-Mar-2023
Document Number: 80131
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(Ø 1.5)
(3.5)
(4)
(8)
(Ø 1)
(1.75)
Y
PIN 1
(2.3)
(2)
Reel off direction
(4)
Y
Y-Y
(2.3)
(0.25)
(1.25)
technical drawings
according to DIN
specifications
Drawing-No.: 9.700-5397.01-4
Issue: 1; 19.02.16
Fig. 13 - Taping
Rev. 1.3, 29-Mar-2023
Document Number: 80131
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RECOMMENDED STORAGE AND REBAKING CONDITIONS
PARAMETER
MIN.
MAX.
UNIT
Storage temperature
CONDITIONS
5
50
°C
Relative humidity
-
60
%
Open time
-
168
h
From the date code on the aluminized envelope (unopened)
-
12
months
Tape and reel: 60 °C
-
22
h
Tube: 60 °C
-
22
h
Total time
Rebaking
RECOMMENDED INFRARED REFLOW
Soldering conditions which are based on J-STD-020 C
IR REFLOW PROFILE CONDITION
PARAMETER
CONDITIONS
Peak temperature
TEMPERATURE
TIME
255 °C + 0 °C / - 5 °C (max.: 260 °C)
10 s
150 °C to 200 °C
60 s to 180 s
Preheat temperature range and timing
Timing within 5 °C to peak temperature
Timing maintained above temperature / time
Timing from 25 °C to peak temperature
-
10 s to 30 s
217 °C
60 s to 150 s
-
8 min (max.)
Ramp-up rate
3 °C/s (max.)
-
Ramp-down rate
6 °C/s (max.)
-
Temperature (°C)
Recommend Normal Solder Reflow is 235 °C to 255 °C
Max. Temperature
260 °C + 0 °C / - 5 °C/10 s
255
Soldering Zone
60 s to 150 s
200
150
Ramp-Down Rate
6 °C/s (max.)
Ramp-Up Rate
3 °C/s (max.)
217
Ramp-Up Rate
3 °C/s (max.)
Pre-Heating Time
t2 - t1 = 60 s to 180 s
t1
t2
Time (s)
Fig. 14 - VEML3235SL Solder Reflow Profile Chart
Rev. 1.3, 29-Mar-2023
Document Number: 80131
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DRYPACK
DRYING
Devices are packed in moisture barrier bags (MBB) to
prevent the products from moisture absorption during
transportation and storage. Each bag contains a desiccant.
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 %.
FLOOR LIFE
Floor life (time between soldering and removing from MBB)
must not exceed the time indicated on MBB label:
Floor life: 168 h
Conditions: Tamb < 30 °C, RH < 60 %
Moisture sensitivity level 3, according to J-STD-020.
Rev. 1.3, 29-Mar-2023
Document Number: 80131
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Disclaimer
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Revision: 01-Jan-2023
1
Document Number: 91000
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