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BH1771GLC データシート(PDF) 26 Page - Rohm |
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BH1771GLC データシート(HTML) 26 Page - Rohm |
26 / 33 page Technical Note 26/32 BH1771GLC www.rohm.com 2011.06 - Rev.B © 2011 ROHM Co., Ltd. All rights reserved. ●ALS Measurement mode explanation Measurement Mode Measurement Time Resolution H-Resolution mode typ. 100ms. 1 Lx M-Resolution mode typ.16ms. 4 Lx We recommend to use H-Resolution Mode. Measurement time ( integration time ) of H-Resolution mode is so long that some kind of noise( including in 50Hz / 60Hz noise ) is rejected. And H-Resolution mode is 1 l x resolution so that it is suitable for darkness. ● Regarding ALS measurement result ALS measurement result is registered as following format ALS DATA LSB ( 4Ch ) 7 6 5 4 3 2 1 0 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 ALS DATA MSB ( 4Dh ) 7 6 5 4 3 2 1 0 2 15 2 14 2 13 2 12 2 11 2 10 2 9 2 8 ALS Lux calculation example ALS DATA LSB = ” 1001_0000 ” ALS DATA MSB = ” 1000_0011 ” ( 2 15 + 29 + 28 + 27 + 24 ) ≒ 33680 [ lx ] ● Regarding PS measurement result PS measurement result is converted to logarithm 8bit data and is registered as following format PS_DATA_LED1 ( 4Fh ), PS_DATA_LED2 ( 50h ), PS_DATA_LED3 ( 51h ) 7 6 5 4 3 2 1 0 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 The data seeing above registers are possible to change the irradiance. Approximation formula is seeing in below. Irradiance : 10 ^ (PS_DATA_LED * 0.0197) [μW/cm^2] PS irradiance calculation example PS_DATA_LED1 = ” 1000_0101 ” 10 ^ ( (2 7 + 22 + 20 ) x 0.0197) = 10^(133 x0.0197) ≒ 417 [μW/cm^2 ] |
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同様の説明 - BH1771GLC |
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