VEML6070
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UVA Light Sensor with I2C Interface
DESCRIPTION
VEML6070 is an advanced ultraviolet (UV) light sensor with
I2C protocol interface and designed by the CMOS process.
It is easily operated via a simple I2C command. The active
acknowledge (ACK) feature with threshold windows setting
allows the UV sensor to send out a UVI alert message.
Under a strong solar UVI condition, the smart ACK signal
can be easily implemented by the software programming.
VEML6070 incorporates a photodiode, amplifiers, and
analog / digital circuits into a single chip. VEML6070’s
adoption of FiltronTM UV technology provides the best
spectral sensitivity to cover UV spectrum sensing. It has an
excellent temperature compensation and a robust refresh
rate setting that does not use an external RC low pass filter.
VEML6070 has linear sensitivity to solar UV light and is
easily adjusted by an external resistor. Software shutdown
mode is provided, which reduces power consumption to be
less than 1 μA. VEML6070’s operating voltage ranges from
2.7 V to 5.5 V.
FEATURES
Package type: surface mount
Dimensions (L x W x H in mm): 2.35 x 1.8 x 1.0
Integrated modules: ultraviolet sensor (UV), and
signal conditioning IC
Converts solar UV light intensity to digital data
Excellent UV sensitivity and linearity via FiltronTM
technology
Excellent performance of UV radiation
measurement under long time solar UV exposure
Excellent temperature compensation
High dynamic detection resolution
•Standard I
2C protocol interface
Support acknowledge feature (ACK)
Immunity on fluorescent light flicker software shutdown
mode control
Package: OPLGA
Temperature compensation: -40 °C to +85 °C
Floor life: 168 h, MSL 3, according to J-STD-020
Output type: I2C bus
Operation voltage: 2.7 V to 5.5 V
Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
APPLICATIONS
Solar UV indicator
Cosmetic / outdoor sport handheld product
Consumer products
Note
(1) Adjustable through I2C interface
Note
(1) MOQ: minimum order quantity
PRODUCT SUMMARY
PART NUMBER
OPERATING
VOLTAGE RANGE
(V)
I2C BUS
VOLTAGE RANGE
(V)
PEAK SENSITIVITY
(nm)
RANGE OF SPECTRAL
BANDWIDTH λ0.5
(nm)
OUTPUT CODE
VEML6070 2.7 to 5.5 1.7 to 5.5 355 ± 20 16 bit, I2C
ORDERING INFORMATION
ORDERING CODE PACKAGING VOLUME (1) REMARKS
VEML6070 Tape and reel MOQ: 2500 pcs 2.35 mm x 1.8 mm x 1.0 mm
ABSOLUTE MAXIMUM RATINGS (Tamb = 25 °C, unless otherwise specified)
PARAMETER TEST CONDITION SYMBOL MIN. MAX. UNIT
Supply voltage VDD 06.0V
Operation temperature range Tamb -40 +85 °C
VEML6070
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BLOCK DIAGRAM
Notes
(1) Test condition: VDD = 3.3 V, temperature: 25°C
(2) Light source: solar light source
(3) Test using 365 nm UVA LED
(4) Ambient light intensity = 500 lx
RECOMMENDED OPERATING CONDITIONS (Tamb = 25 °C, unless otherwise specified)
PARAMETER TEST CONDITION SYMBOL MIN. MAX. UNIT
Supply voltage VDD 2.7 5.5 V
Operation temperature range Tamb -40 +85 °C
I2C bus operating frequency f(I2CCLK) 10 400 kHz
PIN DESCRIPTIONS
PIN ASSIGNMENT SYMBOL TYPE FUNCTION
1 GND I Power supply ground, all voltage are reference to GND
2 ACK O (open drain) Acknowledge pin
3 SDA I / O (open drain) I2C digital serial data output to the host
4 RSET Light reading adjustment, connect a resistor to GND
5SCLII
2C digital serial clock input from the host
6V
DD I Supply voltage
BASIC CHARACTERISTICS (Tamb = 25 °C, unless otherwise specified)
PARAMETER TEST CONDITION SYMBOL MIN. TYP. MAX. UNIT
Supply operation voltage VDD 2.7 - 5.5 V
Supply current RSET = 240 kΩ (1)(2) IDD - 100 250 μA
I2C signal input Logic high (1)(2) VIH 1.5 - VDD V
Logic low VIL --0.8
Peak sensitivity wavelength λp- 355 - nm
Range of spectral sensitivity λ0.1 320 - 410 nm
UVA sensitivity RSET = 240 kΩ, IT = 1T (3) -5-μW/cm
2/step
Maximum UVA detection power RSET = 240 kΩ, IT = 1T (3) - - 328 mW/cm2
Dark offset RSET = 240 kΩ, IT = 1T (3) 015steps
Output offset RSET = 240 kΩ, IT = 1T (1)(4) -2-steps
Shutdown current Light condition = dark (1) IDD - 1 15 μA
1
2
3
VDD
SCLACK
SDA
6
5
4
GND
RSET
UV-PD
VEML6070
Output buffer
I2C interface
Low pass
lter
Temperature
sensor
Oscillator
Timing
controller
VEML6070
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Fig. 1 - I2C Timing Diagram
I2C TIMING CHARACTERISTICS (Tamb = 25 °C, unless otherwise specified)
PARAMETER SYMBOL STANDARD MODE FAST MODE UNIT
MIN. MAX. MIN. MAX.
Clock frequency f(SMBCLK) 10 100 10 400 kHz
Bus free time between start and stop condition t(BUF) 4.7 - 1.3 - μs
Hold time after (repeated) start condition;
after this period, the first clock is generated t(HDSTA) 4.0 - 0.6 - μs
Repeated start condition setup time t(SUSTA) 4.7 - 0.6 - μs
Stop condition setup time t(SUSTO) 4.0 - 0.6 - μs
Data hold time t(HDDAT) 3450 - 900 ns
Data setup time t(SUDAT) 250 - 100 - ns
I2C clock (SCK) low period t(LOW) 4.7 - 1.3 - μs
I2C clock (SCK) high period t(HIGH) 4.0 - 0.6 - μs
Detect clock / data low timeout t(TIMEOUT) 25 35 - - ms
Clock / data fall time t(F) - 300 - 300 ns
Clock / data rise time t(R) - 1000 - 300 ns
I
2
C Bus
CLOCK
(SCL)
I
2
C Bus
DATA
(SDA)
V
IH
V
IH
t
(LOW)
V
IL
t
(R)
t
(HDSTA)
t
(BUF)
V
IL
t
(HDDAT
)
t
(F)
t
(HIGH)
t
(SUSTA)
t
(SUDAT
)
t
(SUSTO)
{
{
P
Stop Condition
S
Start Condition
{
{
PS
t
(LOSEXT)
t
(LOWMEXT)
t
(LOWMEXT)
SCL
ACK
SDA
ACK
Start Stop
t
(LOWMEXT)
I
2
C Bus
CLOCK
(SCL)
I
2
C Bus
DATA
(SDA)
VEML6070
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PARAMETER TIMING INFORMATION
Fig. 2 - Timing for Send Byte Command Format
Fig. 3 - I2C Timing for Receive Byte Command Format
TYPICAL PERFORMANCE CHARACTERISTICS (Tamb = 25 °C, unless otherwise specified)
Fig. 4 - Normalized Spectral Response Fig. 5 - Normalized Output vs. View Angle
W
SA6 SA5 SA4 SA3 SA2 DA7 DA5 DA4 DA3 DA2 DA1
SA1SA7 DA0DA7
I2C Bus Slave Address Byte Command Byte
Start by
Master
ACK by
VEML6070
ACK by
VEML6070
Stop by
Master
I
2
C Bus
CLOCK
(SCL)
I
2
C Bus
DATA
(SDA)
SA6 SA5 SA4 SA3 SA2 DA6 DA5 DA4 DA3 DA2 DA1
SA1SA7 DA0DA7
R
VEML6070 Data Byte
Start by
Master
ACK by
Master
ACK by
VEML6070
Stop by
Master
I
2
C Bus
CLOCK
(SCL)
I
2
C Bus
DATA
(SDA)
I2C Bus Slave Address Byte
10
100
1000
10000
0
10
20
30
40
50
60
70
80
90
100
300 350 400 450 500 550 600
Axis Title
1st line
2nd line
2nd line
Normalized Output (%)
λ- Wavelength (nm)
2nd line
View Angle OPLGA package
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
View Angle
Normalized Output
Ideal Cosine
VEML6070
VEML6070
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Fig. 6 - IDD vs.Temperature Fig. 7 - Refresh Time
APPLICATION INFORMATION
Pin Connection with the Host
VEML6070 is a cost effective solution for ultraviolet light sensing with I2C interface. The standard serial digital interface easily
accesses “UV light intensity” digital data.
The additional capacitor near the VDD pin is used for power supply noise rejection. For the I2C bus design, the pull-up voltage
refers to the I/O of the baseband due to the “open drain” design. The pull-up resistors for the I2C bus design are recommended
to be 2.2 kΩ. The circuit diagram as an example is shown in figure 8.
Fig. 8 - Hardware Pin Connection Diagram
Temperature vs. IDD
75
85
95
105
115
125
10 20 30 40 50 60 70 80 90 100 110
Temperature
IDD (uA)
CM3512 Refresh Time
0
25
50
75
100
125
150
175
200
225
250
275
300
325
350
375
400
425
450
475
500
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
1050
1100
1150
1200
Rset (Kohm)
Time (ms)
I2C Bus Data SDA
I2C Bus Clock SCL
GPIO (INT)
SDA (3)
SCL (5)
ACK (2)
GND (1)
VDD (6)
C2
C1
R4
100 nF10 μF
10R
2.7 V to 5.5 V
1.7 V to 5.5 V
R2R1
RSET (4)
R3
C1 and R4
are optional
for very
disturbed
supply
R5
270K
Host
Micro Controller
VEML6070
VEML6070
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Rev. 1.7, 05-Dec-16 6Document Number: 84277
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Digital Interface
VEML6070 contains a 8-bit command register written via the I2C bus. All operations can be controlled by the command register.
The simple command structure enables users to easily program the operation setting and latch the light data from VEML6070.
In figure 9, VEML6070 I2C command format description for reading and writing operation between the host and VEML6070 are
shown. The white sections indicate host activity and the gray sections indicate VEML6070’s acknowledgement of the host
access activity.
Fig. 9 - VEML6070 Command Protocol
Slave Address and Function Description
The VEML6070 has one slave address used for write functions (command) and two slave addresses used for read functions
(UV data LSB and MSB).
The 7-bit address for write functions is 38h = 0111000x resulting in a 70h = 01110000 8-bit address. The 7-bit addresses
for read functions are 38h = 0111000x for the UV Data LSB and 39h = 0111001x for the UV data MSB. This results in a
71h = 01110001 and 73h = 01110011 8-bit address, respectively. The 7-bit address 39h should not be used for a write function.
Command Register Format
VEML6070 provides a command to set device operations and sensitivity adjustment. This command is 8-bit long and includes
4 parameter groups for programming. The command format descriptions and register setting explanations are shown in
tables 1 and 2.
TABLE 1 - COMMAND REGISTER BITS DESCRIPTION
COMMAND FORMAT
Reserved ACK ACK_THD IT Reserved SD
Bit 7Bit 6Bit 5Bit 4Bit 3Bit 2Bit 1Bit 0
00ACKTHDIT1IT01SD
DESCRIPTION
Reserved Reserved
ACK Acknowledge activity setting
ACK_THD Acknowledge threshold window setting for byte mode usage
IT Integration time setting
SD Shutdown mode setting
SSlave address Rd ALight data (1 byte) A P
SSlave address Wr ACommand (1 byte) A P
Send byte → write command to UVS
Receive byte → read data from UVS
S = start condition
P = stop condition
A = acknowledge
Shaded area = VEML6070 acknowledge
VEML6070
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Note
(1) Please refer to table 4, “Example of Refresh Time and RSET Value Relation”
Data Access
VEML6070 has 16-bit resolution to give high resolution for light intensity sensing. Examples of the application setting are shown
in table 3.
Notes
Slave addresses (8 bits) for data read: 0x71 and 0x73
Data reading sequence for the host:
-Set read command to 0x73, read MSB 8 bits of 16 bits light data (sequence 1)
-Set read command to 0x71, read LSB 8 bits of 16 bits light data for completing data structure (sequence 2)
Initialization
VEML6070 needs to be initialized while the system’s power is on. The initialization includes two major steps: (1) clear ACK state
of UVS and (2) fill the initial value, 06 (HEX), into the 0x70 addresses. After the initialization is completed, VEML6070 can be
programmable for operation by write command setting from the host. VEML6070 initialization is recommended to be completed
within 150 ms.
Acknowledge Activity
VEML6070 provides a function for sending an acknowledge signal (ACK) to the host when the value of sensed UV light is over
the programmed threshold (ACK_THD) value. The purpose of the ACK signal is similar to the interrupt feature which informs the
host once the sensed data level goes beyond the interrupt threshold setting. VEML6070 has two ACK threshold values,
102 steps and 145 steps.
There are two methods of driving acknowledge condition and read / write command to VEML6070:
(1) If the host implements the INT function, it performs a modified received byte operation to disengage VEML6070’s
acknowledge signal and acknowledge alert response address (ARA), 0x18 (Hex). A command format for responses to an
ARA is shown in figure 10.
Fig. 10 - Command Format for Responds to an ARA
(2) If the host does not implement this feature, it should periodically access the ARA or read ARA before setting each read /
write command.
The behavior of an ACK signal is similar to the INT definition in I2C specification. For the hardware circuit design, this pin
connects to an INT pin or GPIO pin of the MCU. The threshold ACK_THD definition is based on the sensitivity setting of
TABLE 2 - REGISTER TABLE SETTING
BITS SETTING DESCRIPTION BITS SETTING DESCRIPTION
Reserved Set initial value to (0 : 0) (IT1 : IT0) (1)
(0 : 0) = ½T
(0 : 1) = 1T
(1 : 0) = 2T
(1 : 1) = 4T
ACK 0 = disable Reserved Set initial value to 1
1 = enable
ACK_THD 0 = 102 steps SD 0 = disable
1 = 145 steps 1 = enable
TABLE 3 - DATA ACCESS DESCRIPTION
VEML6070 16-BIT DATA BUFFER
Data bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Sequence 1
Sequence 2
SARA (0x18) Rd AUVS Slave Address A P
VEML6070
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VEML6070.
The ACK or UVI interrupt function allows the UVI sensing system to perform data pooling based on the interrupt event. The
system sensor manager does not need to do continual data pooling and this significantly reduced the MCU loading. The ACK
signal can also be used as a trigger event for popping up a warning UVI message.
Refresh Time Determination
VEML6070’s refresh time can be determined by the RSET value. Cooperating with the command register setting, the designer
has a flexible way of defining the timing for light data collection. The default refresh time is 1T, (IT1 : IT0) = (0 : 1). If the RSET
value is changed, the default timing changes and the other parts in the register table also change by comparing itself with the
default timing (refer to figure 7).
Table 4 is an example of two RSET resistors that show the timing table that the system designer can use a flexible way to
determine the desired refresh time.
The designer can decide the refresh timing range requirement first, then choose an appropriate RSET value for the timing range,
and then write the correct value for the system application via I2C protocol.
TABLE 4 - EXAMPLE OF REFRESH TIME AND RSET VALUE RELATION
REGISTER SETTING REFRESH TIME
RSET = 300 kΩRSET = 600 kΩ
(IT1 : IT0)
(0 : 0) = ½T 62.5 ms 125 ms
(0 : 1) = 1T 125 ms 250 ms
(1 : 0) = 2T 250 ms 500 ms
(1 : 1) = 4T 500 ms 1000 ms
VEML6070
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PACKAGE INFORMATION in millimeters
Fig. 11 - VEML6070 A3OP Package Dimensions
LAYOUT NOTICE
Fig. 12 - VEML6070 OPLGA PCB Layout Footprint
Pin 1 Marking
0.6
1.80 ± 0.15
0.3 ± 0.1
0.075 min.
0.45±0.1
0.4±0.1 0.15 min.
2.35 ± 0.15
0.56
0.20
1.0 ± 0.1
1
34
6
TOP VIEW BOTTOM VIEWSIDE VIEW
0.1
0.28
1 6 VDD
GND
43 RSETSDA
52 SCLACK
VEML6070 pin-out assignment
2.25 mm
0.4 mm
0.6 mm
1.0 mm 0.45 mm
VEML6070
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APPLICATION CIRCUIT BLOCK REFERENCE
Fig. 13 - VEML6070 Application Circuit
Notes
•V
DD range: 2.7 V to 5.5 V
The pull-up voltage for I2C bus is referring to the I/O specification of baseband
RECOMMENDED INFRARED REFLOW
Soldering conditions are based on J-STD-020 C definition.
1. After opening the tape and reel, IR reflow process should be done
2. IR reflow profile conditions
3. Recommend Normal Solder Reflow is 235 °C to 255 °C
RECOMMENDED STORAGE AND REBAKING CONDITIONS
PARAMETER CONDITIONS MIN. MAX. UNIT
Storage temperature 5 50 °C
Relative humidity - 60 %
Open time Rebaking process should be done when aluminized envelope reopened - -
Total time From the date code on the aluminized envelope (unopened) - 6 months
Rebaking Tape and reel: 60 °C - 22 h
Tube: 60 °C - 22 h
IR REFLOW PROFILE CONDITION
PARAMETER CONDITIONS TEMPERATURE TIME
Peak temperature 255 °C + 0 °C / - 5 °C (max.: 260 °C) 10 s
Preheat temperature range and timing 150 °C to 200 °C 60 s to 180 s
Timing within 5 °C to peak temperature - 10 s to 30 s
Timing maintained above temperature / time 217 °C 60 s to 150 s
Timing from 25 °C to peak temperature - 8 min (max.)
Ramp-up rate 3 °C/s (max.) -
Ramp-down rate 6 °C/s (max.) -
I2C Bus Data SDA
I2C Bus Clock SCL
GPIO (INT)
SDA (3)
SCL (5)
ACK (2)
GND (1)
VDD (6)
C2
C1
R4
100 nF10 μF
10R
2.7 V to 5.5 V
1.7 V to 5.5 V
R2R1
RSET (4)
R3
C1 and R4
are optional
for very
disturbed
supply
R5
270K
Host
Micro Controller
VEML6070
VEML6070
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Fig. 14 - VEML6070 A3OP Solder Reflow Profile Chart
RECOMMENDED IRON TIP SOLDERING CONDITION AND WARNING HANDLING
1. Solder the device with the following conditions:
1.1. Soldering temperature: 400 °C (max.)
1.2. Soldering time: 3 s (max.)
2. If the temperature of the method portion rises in addition to the residual stress between the leads, the possibility that an
open or short circuit occurs due to the deformation or destruction of the resin increases.
3. The following methods: VPS and wave soldering, have not been suggested for the component assembly.
4. Cleaning method conditions:
4.1. Solvent: methyl alcohol, ethyl alcohol, isopropyl alcohol
4.2. Solvent temperature < 45 °C (max.)
4.3. Time: 3 min (min.)
200
150
217
255
Temperature (°C)
Time (s)
t
2
t
1
Max. Temperature
(260 °C + 5 °C / - 5 °C)/10 s
Ramp-Down Rate
6 °C/s (max.)
Ramp-Up Rate
3 °C/s (max.)
Soldering Zone
60 s to 150 s
Ramp-Up Rate
3 °C/s (max.)
Pre-Heating Time
t2 - t1 = 60 s to 180 s
VEML6070
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TAPE PACKAGING INFORMATION in millimeters
Fig. 15 - VEML6070 A3OP Package Carrier Tape Fig. 16 - Taping Direction
Fig. 17 - Reel Dimension
PIN 1
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