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BH1721FVC-TR Datasheet(PDF) 5 Page - Rohm |
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BH1721FVC-TR Datasheet(HTML) 5 Page - Rohm |
5 / 19 page BH1721FVC Technical Note 5/15 www.rohm.com 2011.11 - Rev.B © 2011 ROHM Co., Ltd. All rights reserved. ● Instruction Set Architecture Instruction Opecode Comments Power Down 0000_0000 No active state. Power On 0000_0001 Waiting for measurement command. Continuously Auto-Resolution Mode 0001_0000 0010_0000 Switch measurement mode automatically by illuminance. Continuously H-Resolution Mode 0001_0010 0010_0010 Start measurement at 1lx resolution. Measurement Time is typically 120ms. Continuously L-Resolution Mode 0001_0011 0001_0110 0010_0011 0010_0110 Start measurement at 8lx resolution. Measurement Time is typically 16ms. Change Measurement time ( High bit ) 010_MT[9,8,7,6,5] Change measurement time. ※ Please refer "adjust measurement result for influence of optical window." Change Masurement time ( Low bit ) 011_MT[4]_XXXX Change measurement time. ※ Please refer "adjust measurement result for influence of optical window." ※ Don't input the other opecode. ● Measurement mode explanation Measurement Mode Measurement Time. Measurement Range. Resolution H-Resolution Mode Typ. 120ms 0 - 8191 lx 1 lx L-Resolution Mode Typ. 16ms 0 - 65528 lx 8 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 lx resolution so that it is suitable for darkness (less than 20 lx) Auto-Resolution mode selects measurement mode automatically. It is determined after 16ms (typ.) passes from measurement start. If BH1721FVC judges that current illuminance is more than 4000 lx, then Data is output at L-resolution mode, else Data is output after 120ms(typ.) from measurement start at H-resolution mode. Please refer below flow chart. Lux > 4000 Start Select mode Lux <= 4000 DATA output at L-resolution mode after 16ms.(typ.) Data output at H-resolution mode after 120ms passes from measurement start. Auto-Resolution mode measurement |
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