Si1102-A-GMR Silicon Laboratories Inc, Si1102-A-GMR Datasheet - Page 9

• Manufacturer Part Number: Si1102-A-GMR
• Description: Proximity Sensors Optical Proximity Detector
• Manufacturer: Silicon Laboratories Inc
• Series: -r

Specifications of Si1102-A-GMR

• Maximum Operating Temperature: + 85 C
• Supply Voltage: 5.25 V
• Supply Current: 10 uA
• Operating Supply Voltage: 2 V to 5.5 V
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 25 C
• Maximum Output Current: 100 mA
• Featured Product: QuickSenseâ„¢ Portfolio
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 336-1826 - BOARD EVAL FOR SI1102

For applications where R1 resistance values are small, the proximity range can vary as a function of the ambient IR
condition. A product cover, which limits the visible light intensity, is helpful in reducing this range variation. It is
recommended that the Si1102 be evaluated and tested in-product under the various light conditions it will
encounter under normal product usage. Setting the potentiometer R1 = 0 is not recommended unless the ambient
light condition is known and relatively constant.
At any given R1 threshold setting, there are many factors that determine the precise distance that the Si1102
reports. These factors include object reflectivity, object size, ambient light type and ambient light intensity. When
used in applications where the ambient light is variable, it is recommended the Si1102 optical window be IR
transmissive but visible light opaque.
*Note: Detection range measured using Kodak Gray cards (18% reflectance), no IR filter under dark ambient conditions (<1 lx).
Notes:
50 k 
50 k 
15 k 
30 k 
1. Distance measured with SFH4650 IR LED, with an IR filter, targeting an 18% gray card, 300 lux (Incandescent or CFL)
2. Average current consumption at VDD = 3.3 V, 25 °C and dark ambient conditions (<100 lx).
R1
Figure 3. Proximity Detection Distance vs. R1 (SFH4650 IR LED 850 nm/40 mW)*
Table 4. Summary of External Component Values and Operating Conditions
Open
R2
0
0
0
50
45
40
35
30
25
20
15
10
5
10
Strobe Frequency
20
250 Hz
250 Hz
250 Hz
2.0 Hz
30
40
12 to 22 cm
12 to 22 cm
40 to 50 cm
17 to 33 cm
Detection Distance
Distance
Rev. 1.0
50
R1(kohm)
1
60
70
IDD Average Current Consumption
80
100 µA
100 µA
100 µA
90
5 µA
100
Si1102
2
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