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BH1715FVC
Technical Note
● 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
decimal
0001_1111
( sensitivity : default * 0.45 )
31
( sensitivity : default * 0.45 )
0100_0101
default
69
default
1111_1110
( sensitivity : default * 3.68 )
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
0001_1111
0100_0101
1111_1110
lx / count
1.85
0.83
0.23
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
11/16
2011.11 - Rev.C
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