SI1141-A10-GM View Datasheet(PDF) - Silicon Laboratories
Part Name
Description
Manufacturer
SI1141-A10-GM Datasheet PDF : 66 Pages
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Si1141/42/43
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.
50
45
40
35
30
25
20
15
10
5
0
47%, Hand, 1 Lux
47%, Hand, 300 Lux Fluorescent
47%, Hand, 300 Lux Incandescent
18% Gray Card, 1 Lux
92% White Card, 1 Lux
5000
10000
15000
PSLEDx_DATA
20000
25000
30000
25
23
47%, Hand, 1 Lux
21
47%, Hand, 300 Lux Fluorescent
47%, Hand, 300 Lux Incandescent
19
18% Gray Card, 1 Lux
92% White Card, 1 Lux
17
15
13
11
9
7
5
0
500
1000
1500
2000
2500
3000
3500
4000
4500
PSLEDx_DATA
Figure 3. Typical Proximity Sense Performance Curves
Preliminary Rev. 0.5
9
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