BU2090F 데이터 시트보기 (PDF) - ROHM Semiconductor

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BU2090F

Serial / Parallel 2-input Drivers

ROHM Semiconductor 

BU2098F, BU2090F, BU2090FS

○Data transmission timing

Technical Note

SDA S A6 A5 A4 A3 A2 A1 A0 R/W ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK P

Slave address

Write data

Latch pulse

Output (Q7～Q0)

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

Fig.5 Timing chart for WRITE

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

Power Supply ON

LEDs all-ON with power supply ON

SDA

S

0

1

1

1

1

1

1

0 ACK 1

1

1

1

1

1

1

1 ACK P

Slave address

Write data

LEDs are all-off by this command.

・RESET CONDITION

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

・RISING TIME OF POWER SUPPLY

VDD must rise within 10ms. If the rise time would exceed 10ms, it is afraid not to reset the BU2098F.

VDD

GND

t≦10ms

Fig.6 Rising time of power supply

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

8/12

2009.06 - Rev.A

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