BH1750FVI

Technical Note

7/17

www.rohm.com

2009.04- Rev.B

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

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

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

①

Send "Continuously H-resolution mode " instruction

ST

0100011

0

Ack

00010000

Ack

SP

②

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

③

Read measurement result.

ST

0100011

1

Ack

High Byte [ 15:8 ]

Ack

Low Byte [ 7:0 ]

Ack

SP

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

( 2

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

Ack

SP

②

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

③

Read measurement result

ST

1011100

1

Ack

High Byte [ 15:8 ]

Ack

Low Byte [ 7:0 ]

Ack

SP

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

( 2

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

then please resend measurement instruction.

from Master to Slave

from Slave to Master