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BH1751FVI
Technical Note
● H-Resolution Mode2
H-resolution mode2 is 0.5lx (typ.) resolution mode. It is suitable if under less than 10 lx measurement data is necessary.
This measurement mode supports “Adjust measurement result for influence of optical window ". Please refer it. It is possible
to detect min. 0.11 lx by using H-resolution mode2.
○ Instruction set architecture for H-resolution mode2
Instruction Opecode
Comments
Continuously H-Resolution Mode2
One Time H-Resolution Mode2
0001_0001
0010_0001
Start measurement at 0.5lx resolution.
Measurement Time is typically 120ms.
Start measurement at 0.5lx resolution.
Measurement Time is typically 120ms.
It is automatically set to Power Down mode after measurement.
○ Measurement sequence example from "Write instruction" to "Read measurement result"
ex) Continuously H-resolution mode2 ( ADDR = 'L' )
from Master to Slave
① Send "Continuously H-resolution mode2 " instruction
from Slave to Master
ST
0100011
0
Ack
00010001
Ack
SP
② Wait to complete 1st H-resolution mode2 measurement.( max. 180ms. )
③ Read measurement result.
2
ST
0100011
1
Ack
14
High Byte [15:8]
2 13 2 12 2 11 2 10 2 9 2 8 2 7
Ack
2
6
2 5
Low Byte [7:0]
2 4 2 3 2 2 2 1
2 0
2 -1
Ack
SP
How to calculate when the data High Byte is "00000000" and Low Byte is "00010010"
( 2 3 + 2 0 ) / 1.2 ≒ 7.5 [ lx ]
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? 2011 ROHM Co., Ltd. All rights reserved.
11/16
2011.11 - Rev.B
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