BH1750FVI

Technical Note

10/17

www.rohm.com

2009.04- Rev.B

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

●

I

1 ) I

Write measurement command and Read measurement result are done by I

specification of I

2) Slave Address

Slave Address is 2 types, it is determined by ADDR Terminal

ADDR = ‘H’ ( ADDR ≧ 0.7VCC ) → “1011100“

ADDR = 'L' ( ADDR ≦ 0.3VCC ) → “0100011“

3 ) Write Format

BH1750FVI is not able to accept plural command without stop condition. Please insert SP every 1 Opecode.

ST

Slave Address

R/W

0

Ack

Opecode

Ack

SP

4 ) Read Format

ST

Slave Address

R/W

1

Ack

High Byte [15:8]

2

Ack

Low Byte [7:0]

2

7

2

6

2

5

2

4

2

3

2

2

2

1

2

0

Ack

SP

ex )

High Byte = "1000_0011"

Low Byte = "1001_0000"

( 2

* I

from Master to Slave

from Slave to Master

S

SDA

SCL

S

t

Sr

tHD

S

P

S