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AS7331 数据表(PDF) 33 Page - OSRAM GmbH |
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AS7331 数据表(HTML) 33 Page - OSRAM GmbH |
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33 / 72 page  Document Feedback AS7331 Functional Description Datasheet • PUBLIC DS001047 • v4-00 • 2023-Mar-24 71 │ 32 The calculation of the input light irradiance by Equation 4 is more precise than the result of Equation 3 because the tolerances of the clock frequency fCLK, are eliminated. The irradiance responsivity Re, and internal conversion time TCONV are determined by the content of register bits CREG1:GAIN and CREG1:TIME (see Figure 48). Their values directly determine the sensitivity, the LSB value, and the full-scale range (FSR) of the detectable irradiance, Ee, of the A/D conversion. Information The values in the Figure 27 up to Figure 32 are calculations based on the general sensitivity without any influences of system and opto-mechanical setup. These values are only an indication for the sensor configuration. Figure 27: UVA- Channel (λ = 315 nm – 410 nm) Programmable FSR and LSB of the Detectable Input Light Irradiance Ee TIME(1) 0 1 2 3 4 5 6 7 NCLK (1) 1024 2048 4096 8192 16384 32768 65536 131072 TCONV[ms] (1) 1 2 4 8 16 32 64 128 RESOL[bit] (1) 10 11 12 13 14 15 16 17 GAIN (1) FSR [µW/cm²] of detectable irradiance Ee (channel A) 2048x 170.000(2) 85.000 1024x 340.000 170.000 512x 680.000 340.000 256x 1360.000 680.000 128x 2720.000 1360.000 64x 5440.000 2720.000 32x 10880.000 5440.000 16x 21760.000 10880.000 8x 43520.000 21760.000 4x 87040.000 43520.000 2x 174080.000 87040.000 1x 348160.000 174080.000 GAIN (1) LSB [nW/cm²] – least significant bit of FSR (channel A) 2048x 166.02 83.01 41.50 20.75 10.38 5.19 2.59 1.30 1024x 332.03 166.02 83.01 41.50 20.75 10.38 5.19 2.59 512x 664.06 332.03 166.02 83.01 41.50 20.75 10.38 5.19 256x 1328.13 664.06 332.03 166.02 83.01 41.50 20.75 10.38 128x 2656.25 1328.13 664.06 332.03 166.02 83.01 41.50 20.75 64x 5312.50 2656.25 1328.13 664.06 332.03 166.02 83.01 41.50 32x 10625.00 5312.50 2656.25 1328.13 664.06 332.03 166.02 83.01 |
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