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参数资料
| 型号： | BU9847GUL-WE2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 16/27页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 4KBIT 2WIRE VCSP50L1 |
| 标准包装： | 3,000 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 4K (512 x 8) |
| 速度： | 400kHz |
| 接口： | I²C，2 线串口 |
| 电源电压： | 1.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 6-UFBGA，CSPBGA |
| 供应商设备封装： | VCSP50L1 |
| 包装： | 带卷 (TR) |
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BU9847GUL-W (4Kbit)
Datasheet
● Software reset
Software reset is executed when to avoid malfunction after power on, and to reset during command input. Software reset
has several kinds, and 3 kinds of them are shown in the figure below. (Refer to Figure 40-(a), Figure 40-(b) and Figure
40-(c).) In dummy clock input area, release the SDA bus (“H” by pull up). In dummy clock area, ACK output and read data
“0” (both “L” level) may be output from EEPROM, therefore, if “H” is input forcibly, output may conflict and over current may
flow, leading to instantaneous power failure of system power source or influence upon devices.
Dummy clock x14
Start x2
SCL
1
2
13
14
Normal command
SDA
Normal command
Figure 40-(a) The case of dummy clock + START + START + command input
Start
Dummy clock x9
Start
SCL
1
2
8
9
Normal command
SDA
Normal command
Figure 40-(b) The case of START + 9 dummy clocks + START + command input
Start x 9
SCL
1
2
3
7
8
9
Normal command
SDA
Normal command
Figure 40-(c) START x 9 + command input
* Start normal command from START input.
● Acknowledge polling
During internal write execution, all input commands are ignored, therefore ACK is not sent back. During internal automatic
write execution after write cycle input, next command (slave address) is sent, and if the first ACK signal sends back “L”,
then it means end of write action, while if it sends back “H”, it means now in writing. By use of acknowledge polling, next
command can be executed without waiting for tWR=5ms.
When to write continuously, R / W = 0, when to carry out current read cycle after write, slave address R / W = 1 is sent,
and if ACK signal sends back “L”, then execute word address input and data output and so forth.
During internal write,
First write command
ACK = HIGH is sent back.
S
T
A
R
T
Write command
S
T
O
P
S
T
A
R
T
Slave A
C
address K
H
S
T
A
R
T
Slave
address
A
C
K
H
…
tWR
Second write command
…
S
T
A
R
T
Slave A
C
address K
H
S
T
A
R
T
Slave
address
A
C
K
L
Word
address
A
C
K
L
Data
A
C
K
L
S
T
O
P
tWR
After completion of internal write,
ACK = LOW is sent back, so input
next word address and data in
succession.
Figure 41. Case to continuously write by acknowledge polling
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
16/24
TSZ02201-0R2R0G100480-1-2
4.SEP.2012 Rev.001
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