BR24T04FVJ-WG_ 查看數據表（PDF） - ROHM Semiconductor

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BR24T04FVJ-WG_

High Reliability Serial EEPROMs I2C BUS BR24□□□□ family

ROHM Semiconductor 

BR24T□□□□Series

Technical Note

○Notes on page write cycle

List of numbers of page write

Number of Pages

8Byte

16Byte

Product number

BR24T01-W

BR24T02-W

BR24T04-W

BR24T08-W

BR24T16-W

The above numbers are maximum bytes for respective types.

Any bytes below these can be written.

32Byte

64Byte

128Byte

256Byte

BR24T32-W

BR24T64-W

BR24T128-W

BR24T256-W

BR24T512-W

BR24T1M-W

In the case BR24T256-W, 1 page=64bytes, but the page

write cycle time is 5ms at maximum for 64byte bulk write.

It does not stand 5ms at maximum × 64byte=320ms(Max.)

○Internal address increment

Page write mode (in the case of BR24T16-W)

WA7

WA4 WA3 WA2 WA1 WA0

0

00000

0

00001

Increment

0

00010

0Eh 0

0

0

01110

01111

00000

Significant bit is fixed.

No digit up

For example, when it is started from address 0Eh,

therefore, increment is made as below,

0Eh→0Fh→00h→01h･･･ which please note.

※0Eh･･･0E in hexadecimal, therefore,

00001110 becomes a binary number.

○Write protect (WP) terminal

・Write protect (WP) function

When WP terminal is set Vcc (H level), data rewrite of all addresses is prohibited. When it is set GND (L level), data

rewrite of all address is enabled. Be sure to connect this terminal to Vcc or GND, or control it to H level or L level. Do

not use it open.

In the case of use it as an ROM, it is recommended to connect it to pull up or Vcc.

At extremely low voltage at power ON / OFF, by setting the WP terminal 'H', mistake write can be prevented.

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

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2011.03 - Rev.A

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