參數(shù)資料
型號(hào)： ST24LW21
廠商： 意法半導(dǎo)體
英文描述： 1Kb (x8) Dual Mode Serial EEPROM for VESA Plug & Play(1Kb雙模式串行EEPROM)
中文描述： 1kB的（× 8）雙模式韋莎插頭串行EEPROM
文件頁(yè)數(shù)： 5/21頁(yè)
文件大?。?/td> 178K
代理商： ST24LW21
I
2
C Bidirectional Mode
The ST24xy21 can be switched from Transmit Only
mode to I
2
C Bidirectional mode by applying a valid
high to low transition on the SCL pin (see Figure 4).
– When the ST24LC21B (or the ST24FC21) is in
the I
2
C Bidirectional mode, the VCLK input
(pin 7) enables (or inhibits) the execution of
any write instruction: if VCLK = 1, write instruc-
tions are executed; if VCLK = 0, write instruc-
tions are not executed.
– When the ST24LW21 (or the ST24FW21) is in
the I
2
C Bidirectional mode, the Write Control
(WC on pin 3) input enables (or inhibits) the
execution of any write instruction: if WC = 1,
write instructions are executed;if WC = 0,
write instructions are not executed.
The ST24xy21 is compatible with the I
2
C standard,
two wire serial interface which uses a bidirectional
data bus and serial clock. The device carries a
built-in 4 bit, unique device identification code
(1010) named Device Select code corresponding
to the I
2
C bus definition.
The ST24xy21 behaves as a slave device in the
I
2
C protocol with all memory operations synchro-
nized by the serial clock SCL. Read and write
operations are initiated by a START condition gen-
erated by the bus master. The START condition is
followed by a stream of 7 bits (Device Select code
1010XXX), plus one read/write bit and terminated
by an acknowledge bit.
When data is written into the memory, the
ST24xy21 responds to the 8 bits received by as-
serting an acknowledge bit during the 9th bit time.
When data is read by the bus master, it must
acknowledges the receipt of the data bytes in the
same way. Data transfers are terminated with a
STOP condition (see READ and WRITE descrip-
tions in the following pages).
Power On Reset: V
CC
lock out write protect
In order to prevent data corruption and inadvertent
write operations during power up, a Power On
Reset (POR) circuit is implemented. Until the V
CC
voltage has reached the POR threshold value
(around 3V), the internal reset is active, all opera-
tions are disabled and the device will not respond
to any command. In the same way, when V
CC
drops
down from the operating voltage to below the POR
threshold value, all operations are disabled and the
device will not respond to any command. A stable
V
CC
must be applied before applying any logic
signal.
AI01892
SCL
SDA
VCLK
Transmit Only Mode
1
2
8
9
MSB
ACK
START
CONDITION
- Temporary Bi-Directional Mode
(ST24FC21 and ST24FW21)
- Locked Bi-Directional Mode
(ST24LC21B and ST24LW21)
- Locked Bi-Directional
Mode (ST24FC21
and ST24FW21)
Figure 4. Transition from Transmit Only (DDC1) to Bi-directional (DDC2B) Mode Waveforms
5/21
ST24LC21B, ST24LW21, ST24FC21, ST24FW21
相關(guān)PDF資料
PDF描述
ST24W04 Serial 4K (512 x 8) EEPROM(串行4K (512 x 8) EEPROM)
ST25C02 Serial 2K (256 x 8) EEPROM(串行2K (256 x 8) EEPROM)
ST25W02 Serial 2K (256 x 8) EEPROM(串行2K (256 x 8) EEPROM)
ST24W08 Serial 8K (1K x 8) EEPROM(串行8K EEPROM)
ST25C08 Serial 8K (1K x 8) EEPROM(串行8K EEPROM)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST24LW21B1 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:I2C Serial EEPROM
ST24LW21B1TR 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:1 Kbit x8 Dual Mode Serial EEPROM for VESA PLUG & PLAY
ST24LW21B6 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:I2C Serial EEPROM
ST24LW21B6TR 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:1 Kbit x8 Dual Mode Serial EEPROM for VESA PLUG & PLAY
ST24LW21M1 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:I2C Serial EEPROM
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