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參數(shù)資料
| 型號(hào)： | BU9881F |
| 英文描述： | I2C Serial EEPROM |
| 中文描述： | I2C串行EEPROM的 |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 142K |
| 代理商： | BU9881F |
5
Standard ICs
BU9881 / BU9881F
Circuit operation
s
Basic operation
The BU9881 / BU9881F is equipped with two modes, a normal I
2
C bus mode (bi-directional mode) and a transmit-
only mode.
The transmit-only mode can be accessed by turning on the power supply to the IC, or by using the software to
control the mode. In this mode, operation is synchronized to the clock input to VCLK, and it is possible to read
the contents of the EEPROM memory from the SDA pin.
To switch from the transmit-only mode to the I
2
C bus mode, the clock signal that recognizes the switching of
HIGH to LOW is input to the SCL pin. The I
2
C bus mode is effective following the edge of that clock.
To switch from the I
2
C bus mode to the transmit-only mode, the software can be used to control the mode, or
the power supply to the IC can be turned off and then on again. This switches back to the transmit-only mode.
(1) Description of mode pin functions
As shown in the illustration below, the software can be used to control the mode pin, enabling switching from the
I
2
C bus mode to the transmit-only mode.
1)Transmit-only mode
This command causes all of the data written to the EEPROM to be read. After the transmit-only mode is
entered, inputting the VCLK clock causes the data to be read from the SDA pin.
The SDA pin is in the "Hi-Z" state for the first nine clock signals input, and data is output sequentially, timed to
the rise of the clock starting with the tenth clock.
Addresses are incremented automatically as clock pulses continue to be input to VCLK, with the data from the
next address being read in sequence. While this is being done, the null bit (HIGH data) is output between the
data of one address and that of the next address.
When the power supply is turned on, and when the mode is switched from the I
2
C bus mode to the transmit-only
mode, the output data for the transmit-only mode is synchronized to VCLK as follows:
Last address data
→
0h address data
→
1h address data
→→→
and is incremented in sequence.
(Following the last address, processing shifts to the 0h address.)
Note: Reading in the transmit-only mode should not be done until the power supply has stabilized. When switch-
ing from the transmit-only mode to the I
2
C bus mode, assure the TVHZ time before beginning communica-
tions.
Set LOW for 2
μ
s or longer
Set HIGH for 2
μ
s or longer
TRANSMIT ONLY MODE
MODE
SCL
I
2
C MODE
I
2
C MODE
Fig. 5
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BU9882FV-W | 制造商:ROHM 制造商全稱:Rohm 功能描述:EDID Memory (For display) |
| BU9882FV-WE2 | 功能描述:電可擦除可編程只讀存儲(chǔ)器 2K BIT 128 X 8 X 2 3.3V/5V 14PIN RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| BU9882F-W | 制造商:ROHM 制造商全稱:Rohm 功能描述:EDID Memory (For display) |
| BU9882F-WE2 | 功能描述:電可擦除可編程只讀存儲(chǔ)器 2K BIT 128 X 8 X 2 3.3V/5V 14PIN RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| BU9882-W | 制造商:ROHM 制造商全稱:Rohm 功能描述:EDID Memory (For display) |
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