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BH1750FVI Datasheet(PDF) 12 Page - Rohm

Part # BH1750FVI
Description  Digital 16bit Serial Output Type Ambient Light Sensor IC
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BH1750FVI Datasheet(HTML) 12 Page - Rohm

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BH1750FVI
Technical Note
12/17
www.rohm.com
2009.04- Rev.B
© 2009 ROHM Co., Ltd. All rights reserved.
H-Resolution Mode2
H-resolution mode2 is 0.5lx ( typ. ) resolution mode. It is suitable if under less than 10 lx measure ment 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
0001_0001
Start measurement at 0.5lx resolution.
Measurement Time is typically 120ms.
One Time H-Resolution Mode2
0010_0001
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' )
Send "Continuously H-resolution mode2 " instruction
ST
0100011
0
Ack
00010001
Ack
SP
Wait to complete 1st H-resolution mode2 measurement.( max. 180ms. )
Read measurement result.
ST
0100011
1
Ack
High Byte [15:8]
2
14 213 212 211 210 29 28 27
Ack
Low Byte [7:0]
2
6
2
5
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+ 20 ) / 1.2 ≒ 7.5 [ lx ]
from Master to Slave
from Slave to Master


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