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PDF Si1132 Data sheet ( Hoja de datos )
| Número de pieza | Si1132 | |
| Descripción | UV INDEX AND AMBIENT LIGHT SENSOR IC | |
| Fabricantes | Silicon Laboratories | |
| Logotipo |  |
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Si1132
UV INDEX AND AMBIENT LIGHT SENSOR IC WITH I2C INTERFACE
Features
Integrated UV index sensor
Industry's lowest power
Digital UV Index register that can consumption
be read through I2C interface
1.71 to 3.6 V supply voltage
Factory calibration to address
< 500 nA standby current
part-to-part variation
Internal and external wake support
Integrated ambient light sensor
Built-in voltage supply monitor and
100 mlx resolution possible,
power-on reset controller
allowing operation under dark I2C Serial communications
glass
Up to 3.4 Mbps data rate
1 to 128 klx dynamic range
Slave mode hardware address
possible across two ADC range
decoding
settings
Small-outline 10-lead 2x2 mm
Accurate lux measurements with
QFN
IR correction algorithm
Temperature Range
–40 to +85 °C
Applications
Fitness/health electronics
Smart watches
Smartphone handsets
Description
Tablets
Portable consumer electronics
Display-backlighting control
The Si1132 is a low-power, ultraviolet (UV) index, and ambient light
sensor with I2C digital interface and programmable-event interrupt output.
This sensor IC includes an analog-to-digital converter, integrated high-
sensitivity visible and infrared photodiodes, and digital signal processor.
The Si1132 offers excellent performance under a wide dynamic range
and a variety of light sources including direct sunlight. The Si1132 can
also work under dark glass covers. The photodiode response and
associated digital conversion circuitry provide excellent immunity to
artificial light flicker noise and natural light flutter noise. The Si1132
devices are provided in a 10-lead 2x2 mm QFN package and are capable
of operation from 1.71 to 3.6 V over the –40 to +85 °C temperature range.
Pin Assignments
SDA
SCL
VDD
INT
DNC
10
1
9
28
QFN-10
37
46
5
DNC
VDD
GND
VDD
VDD
Rev. 1.2 12/14
Copyright © 2014 by Silicon Laboratories
Si1132
1 page  
Si1132
Table 2. Performance Characteristics1 (Continued)
Parameter
Symbol
Test Condition
Min Typ Max Unit
Visible Photodiode
Response
Sunlight
ALS_VIS_ADC_GAIN=0
VIS_RANGE=0
— 0.282 — ADC
counts/
lux
2500K incandescent bulb
ALS_VIS_ADC_GAIN=0
VIS_RANGE=0
— 0.319 — ADC
counts/
lux
“Cool white” fluorescent
ALS_VIS_ADC_GAIN=0
VIS_RANGE=0
— 0.146 — ADC
counts/
lux
Infrared LED (875 nm)
ALS_VIS_ADC_GAIN=0
VIS_RANGE=0
— 8.277 — ADC
counts.
m2/W
Small Infrared Photodiode
Response
Sunlight
ALS_IR_ADC_GAIN=0
IR_RANGE=0
— 2.44 — ADC
counts/
lux
2500K incandescent bulb
ALS_IR_ADC_GAIN=0
IR_RANGE=0
— 8.46 — ADC
counts/
lux
“Cool white” fluorescent
ALS_IR_ADC_GAIN=0
IR_RANGE=0
— 0.71 — ADC
counts/
lux
Infrared LED (875 nm)
ALS_IR_ADC_GAIN=0
IR_RANGE=0
— 452.38 — ADC
counts.
m2/W
Visible Photodiode Noise
All gain settings
— 7 — ADC
counts
RMS
Small Infrared Photodiode
Noise
All gain settings
— 1 — ADC
counts
RMS
Notes:
1. Unless specifically stated in "Conditions", electrical data assumes ambient light levels < 1 klx.
2. Represents the time during which the device is drawing a current equal to Iactive for power estimation purposes.
Assumes default settings.
Rev. 1.2
5
5 Page 
Si1132
2.3. Ultraviolet (UV) Index
The UV Index is a number linearly related to the intensity of sunlight reaching the earth and is weighted according
to the CIE Erythemal 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 and includes a simplified consumer UV exposure level as shown in Figures 5 and 6.
Figure 4. CIE Erythemal Action Spectrum
Figure 5. UV Index Scale
Figure 6. UV Levels
Rev. 1.2
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet Si1132.PDF ] | |
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