BH1750FVI(2009) データシートの表示（PDF） - ROHM Semiconductor

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BH1750FVI
(Rev.:2009)

Ambient Light Sensor IC Series Digital 16bit Serial Output Type Ambient Light Sensor IC

ROHM Semiconductor 

BH1750FVI

Technical Note

●Measurement sequence example from "Write instruction" to "Read measurement result"

ex1) Continuously H-resolution mode ( ADDR = 'L' )

from Master to Slave

from Slave to Master

① Send "Continuously H-resolution mode " instruction

ST

0100011

0 Ack

00010000

② Wait to complete 1st H-resolution mode measurement.( max. 180ms. )

③ Read measurement result.

ST

0100011

1 Ack

High Byte [ 15:8 ]

Low Byte [ 7:0 ]

Ack SP

Ack SP

Ack

How to calculate when the data High Byte is "10000011" and Low Byte is "10010000"

( 215 + 29 + 28 + 27 + 24 ) / 1.2 ≒ 28067 [ lx ]

The result of continuously measurement mode is updated.( 120ms.typ at H-resolution mode, 16ms.typ at L-resolution

mode )

ex2 ) One time L-resolution mode ( ADDR = 'H' )

① Send "One time L-resolution mode " instruction

ST

1011100

0 Ack

00100011

② Wait to complete L-resolution mode measurement.( max. 24ms. )

③ Read measurement result

ST

1011100

1 Ack

High Byte [ 15:8 ]

Ack SP

Ack

Low Byte [ 7:0 ]

Ack SP

How to calculate when the data High Byte is "00000001" and Low Byte is "00010000"

( 28 + 24 ) / 1.2 ≒ 227 [ lx ]

In one time measurement, Statement moves to power down mode after measurement completion.If updated result is need

then please resend measurement instruction.

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© 2009 ROHM Co., Ltd. All rights reserved.

7/17

2009.04- Rev.B

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