BH1750FVI(2009) Ver la hoja de datos (PDF) - ROHM Semiconductor

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Fabricante

BH1750FVI
(Rev.:2009)

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

ROHM Semiconductor 

BH1750FVI

Technical Note

●I2C Bus Access

1 ) I2C Bus Interface Timing chart

Write measurement command and Read measurement result are done by I2C Bus interface. Please refer the formally

specification of I2C Bus interface, and follow the formally timing chart.

SDA

tf

tLOW

tr

tSU ; DAT

tf

SCL

tHD ; STA

S

tHD ; DAT

tHtIGH

tSU ; STA

Sr

S

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“

tHtHD ;DSTA

tr

tBUF

tSU;STO

P

SS

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]

215 214 213 212 211 210 29 28

Ack

Low Byte [7:0]

27 26 25 24 23 22 21 20

Ack SP

from Master to Slave

ex )

High Byte = "1000_0011"

Low Byte = "1001_0000"

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

* I2C BUS is trademark of Phillips Semiconductors. Please refer formality specification.

from Slave to Master

www.rohm.com

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

10/17

2009.04- Rev.B

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