Os motores de busca de Datasheet de Componentes eletrônicos
  Portuguese  ▼
ALLDATASHEETPT.COM

X  

SI1133 Folha de dados(PDF) 4 Page - Silicon Laboratories

Nome de Peças SI1133
Descrição Electrónicos  UV Index/Ambient Light Sensor IC with IC Interface
Download  43 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  SILABS [Silicon Laboratories]
Página de início  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI1133 Folha de dados(HTML) 4 Page - Silicon Laboratories

  SI1133 Datasheet HTML 1Page - Silicon Laboratories SI1133 Datasheet HTML 2Page - Silicon Laboratories SI1133 Datasheet HTML 3Page - Silicon Laboratories SI1133 Datasheet HTML 4Page - Silicon Laboratories SI1133 Datasheet HTML 5Page - Silicon Laboratories SI1133 Datasheet HTML 6Page - Silicon Laboratories SI1133 Datasheet HTML 7Page - Silicon Laboratories SI1133 Datasheet HTML 8Page - Silicon Laboratories SI1133 Datasheet HTML 9Page - Silicon Laboratories Next Button
Zoom Inzoom in Zoom Outzoom out
 4 / 43 page
background image
3. Functional Description
The Si1133 is a UV and Ambient Light sensor whose operational state is controlled through registers accessible through the I2C inter-
face. The host can command the Si1133 to initiate on-demand UV or Ambient Light measurement. The host can also place the Si1133
in an autonomous operational state where it performs measurements at set intervals and interrupts the host either after each measure-
ment is completed or whenever a set threshold has been crossed. This results in an overall system power saving allowing the host
controller to operate longer in its sleep state instead of polling the Si1133.
Figure 3.1. Si1133 Basic Application
3.1 Ambient Light Sensing
The Si1133 has photodiodes capable of measuring visible and infrared light. However, the visible photodiode is also influenced by infra-
red light. The measurement of illuminance requires the same spectral response as the human eye. If an accurate lux measurement is
desired, the extra IR response of the visible-light photodiode must be compensated. Therefore, to allow the host to make corrections to
the infrared light’s influence, the Si1133 reports the infrared light measurement on a separate channel. The separate visible and IR
photodiodes lend themselves to a variety of algorithmic solutions. The host can then take these two measurements and run an algo-
rithm to derive an equivalent lux level as perceived by a human eye. Having the IR correction algorithm running in the host allows for
the most flexibility in adjusting for system-dependent variables. For example, if the glass used in the system blocks visible light more
than infrared light, the IR correction needs to be adjusted.
If the host is not making any infrared corrections, the infrared measurement can be turned off in the CHAN_LIST parameter.
By default, the measurement parameters are optimized for indoor ambient light levels, where it is possible to detect low light levels. For
operation under direct sunlight, the ADC can be programmed to operate in a high signal operation so that it is possible to measure
direct sunlight without overflowing.
For low-light applications, it is possible to increase the ADC integration time. Normally, the integration time is 24.4 µs. By increasing this
integration time, the ADC can detect light levels as low as 100 mlx. The ADC integration time for the Visible Light Ambient measure-
ment can be programmed independently of the ADC integration time of the Infrared Light Ambient measurement. The independent ADC
parameters allow operation under glass covers having a higher transmittance to Infrared Light than Visible Light.
When operating in the lower signal range, or when the integration time is increased, it is possible to saturate the ADC when the ambient
light suddenly increases. Any overflow condition will have the corresponding data registers report a value of 0xFFddFF for 16-bit mode
and 0x7FFFFF for 24-bit mode. The host can adjust the ADC sensitivity to avoid an overflow condition. If the light levels return to a
range within the capabilities of the ADC, the corresponding data registers begin to operate normally.
The Si1133 can initiate ALS measurements either when explicitly commanded by the host or periodically through an autonomous proc-
ess. Refer to Section 4. Operational Modes for additional details.
Two ADCs can be used for simultaneous readings of the visible or UV photodiode and black dark current reference photodiode. When
subtracted, these differential measurements remove dark current, reducing noise that enables lower light sensitivity.
Si1133 Data Sheet
Functional Description
silabs.com | Smart. Connected. Energy-friendly.
Rev. 0.91 | 3


Nº de peça semelhante - SI1133

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Silicon Laboratories
SI1132 SILABS-SI1132 Datasheet
703Kb / 49P
   Integrated ambient light sensor
More results

Descrição semelhante - SI1133

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Silicon Laboratories
SI1153 SILABS-SI1153 Datasheet
1Mb / 58P
   Proximity/Ambient Light Sensor IC with IC Interface
SI1141 SILABS-SI1141 Datasheet
505Kb / 66P
   PROXIMITY/AMBIENT LIGHT SENSOR IC WITH I2C INTERFACE
logo
Vishay Siliconix
VEML7700 VISHAY-VEML7700 Datasheet
204Kb / 12P
   High Accuracy Ambient Light Sensor with IC Interface
Rev. 1.0, 19-Nov-15
logo
Silicon Laboratories
SI1153-AB9X-GMR SILABS-SI1153-AB9X-GMR Datasheet
918Kb / 61P
   Proximity/Ambient Light Sensor IC with I2C Interface
Rev. 1.3
SI115X SILABS-SI115X Datasheet
1Mb / 65P
   Proximity/Ambient Light Sensor IC with I2C Interface
Rev. 1.4
SI1141-A11-GM SILABS-SI1141-A11-GM Datasheet
1Mb / 77P
   PROXIMITY/AMBIENT LIGHT SENSOR IC WITH I 2C INTERFACE
Rev. 1.42 3/21
logo
Rohm
BH1600FVC ROHM-BH1600FVC Datasheet
255Kb / 5P
   Analog Output Ambient Light Sensor IC
BH1680FVC ROHM-BH1680FVC Datasheet
265Kb / 9P
   Ambient Light Sensor ICs Analog Current Output Type Ambient Light Sensor IC
logo
ON Semiconductor
NOA1302 ONSEMI-NOA1302 Datasheet
226Kb / 9P
   Ambient Light Sensor with I2C Interface
August, 2009 ??Rev. 1
logo
TEXAS ADVANCED OPTOELEC...
TSL2550 TAOS-TSL2550 Datasheet
272Kb / 20P
   AMBIENT LIGHT SENSOR WITH SMBus INTERFACE
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43


Folha de dados Download

Go To PDF Page


Ligação URL




Privacy Policy
ALLDATASHEETPT.COM
ALLDATASHEET é útil para você?  [ DONATE ] 

Sobre Alldatasheet   |   Publicidade   |   Contato conosco   |   Privacy Policy   |   roca de Link   |   Lista de Fabricantes
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com