June 21-07 revH

SP7680: Complete Backlight Solution



2007 Sipex Corporation

Page 10

APPLICATIONS INFORMATION

I

The I

data to the bus as a transmitter and any device

that reads the data as a receiver. The device

that controls the data transfer is known as the

master and the other device as the slave. The

master will always initiate a data transfer and will

provide the serial clock for synchronization.

Data input format:

S SP7680

Address

7-bit

1/0

A

Data

for

Status

8-bit

A

Data

for

CNTRL

8-bit

A

Data

for

Main

8-bit

A

Data

for

Sub

8-bit

A

Data

for

Aux

8-bit

A

SP

SP7680 I

Fuses

Device Address

Fuse1

Fuse0

A7

A6

A5

A4

A3

A2

A1

A0

0

0

0

0

1

0

1

0

0

0

0

1

0

0

1

0

0

0

0

0

1

0

0

0

1

1

1

0

0

0

1

1

0

0

1

1

0

0

0

0

I²C Serial Interface

The SP7680 has five data registers which can be

programmed serially via the I²C interface.

The

STATUS register is used to enable/disable the part

as well as for fault mode readback.

The CNTRL

register contains information regarding the state of

each of the 7 individual LEDs. The final three

registers contain information regarding the current

level for the MAIN, SUB and AUX channels.

The register bits are as follows:

Registers

STATUS Register

In the STATUS register, b7 and b6 are used to

enable/disable the SP7680. The following table

defines the states for bits WZ and WP. These bits

are used to put the SP7680 into shutdown, standby

or active mode.

Stop

condition

Start

Condition

Acknowledge,

sent by slave