SI1153 datasheet(7/58 Pages) SILABS

Teilenummer	SI1153

Bauteilbeschribung	Proximity/Ambient Light Sensor IC with IC Interface

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Hersteller	SILABS [Silicon Laboratories]

Direct Link	http://www.silabs.com

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To support different power usage cases dynamically, the infrared LED current of each output is independently programmable. The cur-

rent can be programmed anywhere from 5.5 to 354 mA. (See Table 8.8 Typical LED Current vs. LED Code on page 44.) Therefore,

the host can optimize for proximity detection performance or for power saving dynamically. This feature can be useful since it allows the

host to reduce the LED current once an object has entered a proximity sphere, and the object can still be tracked at a lower current

setting. Finally, the flexible current settings make it possible to control the infrared LED currents with a controlled current sink, resulting

in higher precision. The ADC properties are programmable. For indoor operation, the ADC should be configured for low signal range for

best reflectance sensitivity. When under high ambient conditions, the ADC should be configured for high signal level range operation.

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 with a value of 0xFFFF for 16-bit mode and 0x7FFFFF for 24-bit mode. The host can then 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 Si1153 can be configured with three different sizes of proximity photodiode to enable the highest sensitivity without saturation.

Proximity detection ranges beyond 50 cm can be achieved with lensing and by selecting a longer integration time. The detection range

may be increased further, even with high ambient light, by averaging multiple measurements.

The Si1153-AA09 version of the Si1153 is designed with an on die 940 nm bandpass filter. It is designed to reject sunlight and to pass

as much of the LED excitation energy as possible. 940 nm is selected as the operating wavelength since it corresponds to a dip in the

energy of the solar spectrum.

Figure 3.4. Typical Si1153-AA09 Filter Response Compared to the Sunlight Energy Spectrum

Si1153 Data Sheet

Functional Description

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Rev. 0.9 | 6

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