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参数资料
| 型号： | BR25S128F-WE2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 8/19页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM SPI 128KB 20MHZ 8-SOP |
| 标准包装： | 1 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 128K (16K x 8) |
| 速度： | 20MHz |
| 接口： | SPI 3 线串行 |
| 电源电压： | 1.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-SOP |
| 包装： | 标准包装 |
| 其它名称： | BR25S128F-WE2DKR |
BR25S □□□ Series
● Command mode
Technical Note
Command
Contents
Ope code
WREN
WRDI
READ
WRITE
RDSR
WRSR
Write enable command
Write disable command
Read command
Write command
Read status register command
Write status register command
0000
0000
0000
0000
0000
0000
0110
0100
0011
0010
0101
0001
● Timing chart
1. Write enable (WREN) / disable (WRDI) command
CSB
WREN (WRITE ENABLE): Write enable
CSB
WRDI (WRITE DISABLE): Write disable
SCK
SI
0
0
0
1
0
2
0
3
0
4
1
5
1
6
0
7
SCK
SI
0
0
0
1
0
2
0
3
0
4
1
5
0
6
0
7
SO
High-Z
SO
High-Z
Fig.33
Write enable command
Fig.34
Write disable command
This IC has write enable status and write disable status. It is set to write enable status by write enable command, and it is
set to write disable status by write disable command. As for these commands, set CSB LOW, and then input the
respective ope codes. The respective commands are accepted at the 7-th clock rise. Even with input over 7 clocks,
command becomes valid.
When to carry out write command, it is necessary to set write enable status by the write enable command. If write
command is input in the write disable status, the command is cancelled. And even in the write enable status, once write
command is executed, it gets in the write disable status. After power on, this IC is in write disable status.
2. Read command (READ)
Product
Address
CSB
～～
～～
～～
number
BR25S320-W
length
A11-A0
SCK
0
1
2
3
4
5
6
7
8
9
10
11
～～
23
24
～～
30
31
BR25S640-W
A12-A0
SI
0
0
0
0
0
0
1
1
*
A14 A13 A12
～～
A1
A0
～～
BR25S128-W
A13-A0
SO
High-Z
～～
D7
D6
～～
～～
D2
D1
D0
BR25S256-W
A14-A0
Fig.35 Read command
By read command, data of EEPROM can be read. As for this command, set CSB LOW, then input address after read ope
code. EEPROM starts data output of the designated address. Data output is started from SCK fall of 23-th clock, and
from D7 to D0 sequentially. This IC has increment read function. After output of data for 1 byte (8bits), by continuing input
of SCK, data of the next address can be read. Increment read can read all the addresses of EEPROM. After reading data
of the most significant address, by continuing increment read, data of the most insignificant address is read.
www.rohm.com
? 2010 ROHM Co., Ltd. All rights reserved.
8/18
2010.12 - Rev.B
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