BU2098F, BU2090F, BU2090FS

Technical Note

8/12

www.rohm.com

2009.06 - Rev.A

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

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Data transmission timing

Fig.5 Timing chart for WRITE

Command sample for driving LEDs. These are all off. (terminal A0～A2 is open)

・

RESET CONDITION

After reset, Q0～Q7 pins are ON. (LEDs are all ON.)

・

RISING TIME OF POWER SUPPLY

Fig.6 Rising time of power supply

VDD

GND

t≦10ms

S

A6

A5

A4

A3

A2

A1

A0

R/W ACK

D6

D5

D4

D3

D2

D1

D0

D7

ACK

P

Slave address

Write data

Output the write data to Q7～Q0 at the same time.

SDA

Latch pulse

Output (Q7～Q0)

S

0

1

1

1

1

1

1

0

ACK

1

1

1

1

1

1

1

1

ACK

P

Slave address

Write data

SDA

LEDs all-ON with power supply ON

LEDs are all-off by this command.

Power Supply ON