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PDF SI1133 Data sheet ( Hoja de datos )
| Número de pieza | SI1133 | |
| Descripción | UV Index/Ambient Light Sensor IC | |
| Fabricantes | Silicon Laboratories | |
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Si1133 Data Sheet
UV Index/Ambient Light Sensor IC with I2C Interface
The Si1133 is a UV Index Sensor and Ambient Light Sensor with I2C digital interface and
programmable-event interrupt output. This sensor IC includes dual 23-bit analog-to-digi-
tal converters, integrated high-sensitivity array of UV, visible and infrared photodiodes,
and digital signal processor. The Si1133 is provided in a 10-lead 2x2 mm DFN package
and capable of operation from 1.62 to 3.6 V over the –40 to +85 °C temperature range.
Applications
• Wearables
• Handsets
• Display backlighting control
• Consumer electronics
KEY FEATURES
• High accuracy UV index sensor (0 to > 20
uV)
• Matches erythermal curve
• Ambient light sensor
• <100 mlx resolution possible, allowing
operation under dark glass
• Up to 128 klx dynamic range possible
across two ADC range settings
• Industry’s lowest power consumption
• 1.62 to 3.6 V supply voltage
• <500 nA standby current
• Internal and external wake support
• Built-in voltage supply monitor and
power-on reset controller
silabs.com | Smart. Connected. Energy-friendly.
Rev. 0.91
1 page  
Si1133 Data Sheet
Functional Description
3.2 Ultraviolet (UV) Index Sensing
The UV Index is a number linearly related to the intensity of sunlight reaching the earth and is weighted according to the CIE erythema
Action Spectrum as shown in Figure 4. This weighting is a standardized measure of human skin's response to different wavelengths of
sunlight from UVB to UVA. The UV Index has been standardized by the World Health Organization as shown in the figure below.
Figure 3.2. CIE Erythemal Action Spectrum
Figure 3.3. UV Index Scale
Isolated UV photodiodes that closely match the erythema curve for accurate UV Index measurements. Matching dark current reference
photodiodes are also provided to cancel UV photodiode noise. The typical calibrated UV Index sensor response vs. calculated ideal UV
Index is shown below for several cloudy and sunny days and at various angles of the sun/time of day.
Given the possible variation of the overlay materials above the Si1133, it is generally recommended that outgoing factory calibration be
performed at the outgoing test to decrease system-to-system variation.
The performance of the Si1133 is best when under a Teflon diffuser while diffuser is within +/- 30 degrees of the sensor view angle.
See the plot below.
silabs.com | Smart. Connected. Energy-friendly.
Rev. 0.91 | 4
5 Page 
5. User to Sensor Communication
Si1133 Data Sheet
User to Sensor Communication
5.1 Basic I2C Operation
I2C operation is dependent on serial I2C reads and writes to an addressable bank of memory referred to as I2C space. The diagram
below outlines the registers used, some functionality and the direction of data flow. The I2C address is initially fixed but can be program-
med to a new value. This new value is volatile and reverts to the old value on hardware or software reset. Only 7-bit I2C addressing is
supported; 10-bit I2C addressing is not supported. The Si1133 responds to the I2C address of 0x55 or to an alternate address of 0x52.
Part and Version ID Group
PART ID
REV ID
MFR ID
INFO_0 & 1 (SPARES)
SDA
Engine
SDA
SCL
MCU
SFR
SPACE
Bit7: RUNNING
Bit6: SUSPEND
Bit5: SLEEP
5
INPUT3 -> 0
COMMAND
Sequencial Write Group
IRQ_EN
RESPONSE_1
RESPONSE_0
IRQ_STATUS
OUTPUT0 to 25
Sequencial Read Group
COMMAND_WR_INT Interrupt
Logic
6
I2C
SPACE
AND
6
OR
OD
INT
6
CR
Figure 5.1. I2C Interface Block Diagram
silabs.com | Smart. Connected. Energy-friendly.
Rev. 0.91 | 10
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SI1133.PDF ] | |
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