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BH1715FVC Datasheet(PDF) 11 Page - Rohm |
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BH1715FVC Datasheet(HTML) 11 Page - Rohm |
11 / 17 page BH1715FVC Technical Note 11/16 www.rohm.com 2010.06 - Rev.B © 2010 ROHM Co., Ltd. All rights reserved. ● Adjust measurement result for influence of optical window. ( sensor sensitivity adjusting ) BH1715FVC is possible to change sensor sensitivity. And it is possible to cancel the optical window influence (difference with / without optical window) by using this function. Adjust is done by changing measurement time. For example, when transmission rate of optical window is 50% ( measurement result becomes 0.5 times if optical window is set ), influence of optical window is ignored by changing sensor sensitivity from default to 2 times Sensor sensitivity is shift by changing the value of MTreg ( measurement time regisiter ). MTreg value has to set 2 times if target of sensor sensitivity is 2 times. Measurement time is also set 2 times when MTreg value is changed from default to 2 times. ex) Procedure for changing target sensor sensitivity to 2 times. Please change Mtreg from ”0100_0101” ( default ) to ”1000_1010” ( default * 2 ). 1) Changing High bit of Mtreg ST Slave Address R/W 0 Ack 01000_100 Ack SP 2) Changing Low bit of Mtreg ST Slave Address R/W 0 Ack 011_01010 Ack SP 3) Input Measurement Command. ST Slave Address R/W 0 Ack 0001_0000 Ack SP ※ This example is High Resolution mode, but it accepts the other measurement. 4) After about 240ms, measurement result is registered to Data Register. (High Resolution mode is typically 120ms, but measurement time is set twice.) The below table is seeing the changable range of MTreg. Min. Typ. Max. changable range of MTreg binary 0001_1111 ( sensitivity : default * 0.45 ) 0100_0101 default 1111_1110 ( sensitivity : default * 3.68 ) decimal 31 ( sensitivity : default * 0.45 ) 69 default 254 ( sensitivity : default * 3.68 ) It is possilbe to detect 0.23lx by using this function at H-resolution mode. The below formula is to calculate illuminance per 1 count. Illuminance per 1 count ( lx / count ) = 1 / 1.2 *( 69 / X ) 1.2 : Measurement accuracy 69 : Default value of MTreg ( dec ) X : MTreg value The below table is seeing the detail of resolution. MTreg value lx / count 0001_1111 1.85 0100_0101 0.83 1111_1110 0.23 |
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