BU9882F-W データシートの表示（PDF） - ROHM Semiconductor

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BU9882F-W

EDID Memory (For display)

ROHM Semiconductor 

BR24C21xxx Series (1K)

Datasheet

●Software Reset

Execute software reset in case the device is at an unexpected state after power up and/or the command input needs to be

reset. The following figures (Figure 13-(a), Figure 13-(b), Figure 13-(c))

During dummy clock, please release SDA BUS (tied to Vcc by pull up resistor).

During that time, the device may pull the SDA line Low for acknowledge or outputting read data. If the master controls the

SDA line High, it will conflict with the device output Low then it makes a current overload. It may cause instantaneous power

down and may damage the device.

SCL

SDA

Dummy Clock×14

Start×2

12

13 14

Figure 13-(a) Dummy Clock×14＋Start＋Start

COMMAND

COMMAND

SCL

SDA

Start

Dummy Clock×9

Start

12

89

COMMAND

COMMAND

Figure 13-(b) Start＋Dummy Clock×9＋Start

Start×9

SCL

1 23

789

SDA

COMMAND

COMMAND

Figure 13-(c) Start×9

●Acknowledge Polling

Since the device ignores all input commands during the internal write cycle, no ACK will be returned. When the master sends

the next command following the write command, and the device returns the ACK, it means that the program is completed. If no

ACK is returned, it means that the device is still busy. By using Acknowledge polling, the waiting time is minimized to less than

tWR=5ms. To prevent operating Write or Current Read immediately after Write, first send the slave address (R/W is "High" or

"Low"). After the device returns the ACK, continue word address input or data output, respectively.

THE FIRST WRITE COMMAND

During the internal write

cycle,

no ACK will be returned.

S

T

A

R

T

WRITE COMMAND

S

T

O

P

S

T

A

R

T

SLAVE

ADDRESS

A

C

K

H

S

T

A

R

T

SLAVE

ADDRESS

A

C

K

H

…

tWR

THE SECOND WRITE COMMAND

…

S

T

A

R

T

SLAVE

ADDRESS

A

C

K

H

tWR

S

T

A

R

T

SLAVE

ADDRESS

A

C

K

L

WORD

ADDRESS

A

C

K

L

DATA

AS

CT

KO

LP

After the internal write cycle

is completed ACK will be returned

(ACK=Low). Then input next

Word Address and data.

Figure 14. Successive Write Operation By Acknowledge Polling

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10.Jul.2012 Rev.001

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