Technical Note

BR24C21,BR24C21F,BR24C21FJ,BR24C21FV,

BU9882-W,BU9882F-W,BU9882FV-W

10/22

www.rohm.com

2011.08 - Rev.C

© 2011 ROHM Co., Ltd. All rights reserved.

Fig.15 Block Diagram

Fig.16 Pin Layout

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Block diagram

●

Pin layout diagram

●

Pin description

Pin Name

I/O

Functions

-

Power Supply

GND

-

Ground (0V)

N.C.

-

No Connection

SCL_PC0

IN

Serial Clock Input, Access to BANK0 at DUAL PORT mode

Access to BANK0 or to BANK1 at SINGLE PORT mode

SDA_PC0

IN/OUT

Slave and Word Address Serial Data Input, Serial Data Output

Access to BANK0 at DUAL PORT mode, Access to BANK0 or to BANK1 at SINGLE PORT mode

SCL_PC1

IN

Serial Clock Input

Access to BANK1 at DUAL PORT mode, Don't Care at SINGLE PORT mode

SDA_PC1

IN/OUT

Slave and Word Address Serial Data Input, Serial Data Output

Access to BANK1 at DUAL PORT mode, Don't Care at SINGLE PORT mode

SCL_MON

OUT

Serial Clock Output

Connected to SCL_PC0/1 at DDCENA="High", "Hi-Z" output at DDCENA="Low"

SDA_MON

OUT

Slave and Word Address Serial Data Output

Connected to SCL_PC0/1 DDCENA="High", "Hi-Z" output at DDCENA="Low"

DDCENA

IN

Control of SCL_MON, SDA_MON

BANKSEL

IN

Select a SCL/SDA_MON Connected Port at DUAL PORT mode

Selected a BANK at SINGLE PORT mode

DUALPCB

IN

Control of DUAL PORT/SINGLE PORT mode

wp

―――

IN

Write Protect Control

An open drain output requires a pull-up resistor.

BU9882-W

BU9882F-W

BU9882FV-W

SCL_PC0 SDA_PC0

N.C.

SCL_PC1 SDA_PC1

N.C.

GND

WP

DUALPCB BANKSEL DDCENA SCL_MON SDA_MON

1Kbit