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Si1142-A10-GM Arkusz danych(PDF) 9 Page - Silicon Laboratories

Numer części Si1142-A10-GM
Szczegółowy opis  PROXIMITY/AMBIENT LIGHT SENSOR IC WITH I2C INTERFACE
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Producent  SILABS [Silicon Laboratories]
Strona internetowa  http://www.silabs.com
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Si11 41/42/43
Preliminary Rev. 0.5
9
When operating in the lower signal range, it is possible to saturate the ADC when the ambient light level is high.
Any overflow condition is reported in the RESPONSE register, and the corresponding data registers report a value
of 0xFFFF. The host can then adjust the ADC sensitivity. Note however that the overflow condition is not sticky. If
the light levels return to a range within the capabilities of the ADC, the corresponding data registers begin to
operate normally. However, the RESPONSE register will continue to hold the overflow condition until a NOP
command is received. Even if the RESPONSE register has an overflow condition, commands are still accepted
and processed.
Proximity detection ranges beyond 50 cm and up to several meters can be achieved without lensing by selecting a
longer integration time. The detection range may be increased further, even with high ambient light, by averaging
multiple measurements. Refer to “AN498: Designer's Guide for the Si114x” for more details.
Figure 3. Typical Proximity Sense Performance Curves
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PSLEDx_DATA
47%, Hand, 1 Lux
47%, Hand, 300 Lux Fluorescent
47%, Hand, 300 Lux Incandescent
18% Gray Card, 1 Lux
92% White Card, 1 Lux
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PSLEDx_DATA
47%, Hand, 1 Lux
47%, Hand, 300 Lux Fluorescent
47%, Hand, 300 Lux Incandescent
18% Gray Card, 1 Lux
92% White Card, 1 Lux


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