BR24A□□-WM series

Technical Note

4/17

www.rohm.com

2009.08 - Rev.C

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

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Block diagram

Fig.2 Block diagram

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Pin assignment and description

Terminal

name

Input /

output

Function

BR24A01A-WM BR24A02-WM BR24A04-WM BR24A08-WM BR24A16-WM BR24A32-WM BR24A64-WM

A0

Input

Slave address setting

Not connected

Slave address setting

A1

Input

Slave address setting

Not connected

Slave address setting

A2

Input

Slave address setting

Not used

Slave address setting

GND

-

Reference voltage of all input / output, 0V

SDA

Input /

output

Slave and word address, Serial data input serial data output

SCL

Input

Serial clock input

WP

Input

Write protect terminal

Vcc

-

Connect the power source.

1Kbit~64Kbit EEPROM array

Control circuit

High voltage

generating circuit

Power source

voltage detection

7bit

8bit

9bit

10bi

t

11bit

12bit

13b

it

Address

decoder

Slave - word

address register

Data

register

8bit

7bit

8bit

9bit

10bi

t

11bit

12bit

13b

it

START

STOP

ACK

*1

*1

1

2

3

4

8

7

6

5

SDA

SCL

WP

Vcc

A1

A0

A2

GND

*2

*2

*2

7bit : BR24A01A-WM

8bit : BR24A02-WM

9bit : BR24A04-WM

10bit : BR24A08-WM

11bit : BR24A16-WM

12bit : BR24A32-WM

13bit : BR24A64-WM

: BR24A04-WM

A0, A1=N.C.

: BR24A08-WM

A0, A1= N.C. A2=Don’t Use

: BR24A16-WM

1

2

3

4

8

6

5

BR24A01A-WM

BR24A02-WM

BR24A04-WM

BR24A08-WM

BR24A16-WM

BR24A32-WM

BR24A64-WM

A0

7

A1

A2

GND

Vcc

WP

SCL

SDA