SI1143 datasheet(9/66 Pages) SILABS

Part #	SI1143

Description	PROXIMITY/AMBIENT LIGHT SENSOR IC WITH I2C INTERFACE

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Manufacturer	SILABS [Silicon Laboratories]

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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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