BD2802GU データシートの表示（PDF） - ROHM Semiconductor

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BD2802GU

System LED Drivers for Mobile phones 6LEDs Illumination

ROHM Semiconductor 

BD2802GU

Technical Note

●I2C BUS format

The writing operation is based on the I2C slave standard.

・Slave address

A7 A6 A5

A4

A3

A2

A1 R/W

ADDSEL=L

0

0

1

1

0

1

0

0

ADDSEL=H

0

0

1

1

0

1

1

0

Slave address can be changed with the external terminal ADDSEL.

・Bit Transfer

SCL transfers 1-bit data during H. SCL cannot change signal of SDA during H at the time of bit transfer. If SDA changes

while SCL is H, START conditions or STOP conditions will occur and it will be interpreted as a control signal.

SDA

SCL

SDA a state of stability： SDA

Data are effective It can change

・START and STOP condition

When SDA and SCL are H, data is not transferred on the I2C- bus. This condition indicates, if SDA changes from H to L

while SCL has been H, it will become START (S) conditions, and an access start, if SDA changes from L to H while SCL

has been H, it will become STOP (P) conditions and an access end.

SDA

SCL

S

START condition

P

STOP condition

・Acknowledge

It transfers data 8 bits each after the occurrence of START condition. A transmitter opens SDA after transfer 8bits data, and

a receiver returns the acknowledge signal by setting SDA to L.

DATA OUTPUT

BY TRANSMITTER

DATA OUTPUT

BY RECEIVER

SCL

S

1

START condition

not acknowledge

acknowledge

2

8

9

clock pulse for

acknowledgement

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7/27

2011.04 - Rev.A

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