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Si1102-A-GM bảng dữ liệu(PDF) 9 Page - Silicon Laboratories |
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Si1102-A-GM bảng dữ liệu(HTML) 9 Page - Silicon Laboratories |
9 / 16 page Si1102 Rev. 1.0 9 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. Figure 3. Proximity Detection Distance vs. R1 (SFH4650 IR LED 850 nm/40 mW)* *Note: Detection range measured using Kodak Gray cards (18% reflectance), no IR filter under dark ambient conditions (<1 lx). Table 4. Summary of External Component Values and Operating Conditions R1 R2 Strobe Frequency Distance1 IDD Average Current Consumption2 50 k 0 250 Hz 12 to 22 cm 100 µA 50 k Open 2.0 Hz 12 to 22 cm 5 µA 15 k 0 250 Hz 40 to 50 cm 100 µA 30 k 0 250 Hz 17 to 33 cm 100 µA Notes: 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). Detection Distance 5 10 15 20 25 30 35 40 45 50 10 20 30 40 50 60 70 80 90 100 R1(kohm) |
Số phần tương tự - Si1102-A-GM |
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Mô tả tương tự - Si1102-A-GM |
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