參數(shù)資料
型號(hào)： ST24LW21M6
英文描述： Cyclone II FPGA 15K FBGA-256
中文描述： I2C串行EEPROM的
文件頁(yè)數(shù)： 5/21頁(yè)
文件大?。?/td> 152K
代理商： ST24LW21M6
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
ST24F IC CONFIG DEVICE 16MBIT 100-PQFP
ST24FC21B1 MAX II CPLD 570 LE 144-TQFP
ST24FC21B6 IC FLEX 6000 FPGA 16K 208-PQFP
ST24FC21M1 FPGA, FLEX 10K, 10K GATES, TQFP144; Logic IC family:FPGA; Logic IC Base Number:10; Logic IC function:EPF10K10; Voltage, supply:5.0V; Case style:TQFP; Gates, No. of:10000; I/O lines, No. of:102; Pins, No. of:144; Temp, op. RoHS Compliant: Yes
ST24FC21M6 IC ACEX 1K FPGA 100K 208-PQFP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST24LW21M6TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1 Kbit x8 Dual Mode Serial EEPROM for VESA PLUG & PLAY
ST24T1M5ZBE 功能描述:SWITCH TOGGLE MINI UNSELD RoHS:是 類別:開關(guān) >> 撥動(dòng)開關(guān) 系列:ST 標(biāo)準(zhǔn)包裝:1 系列:A 電路:雙刀雙擲 開關(guān)功能:開-開-開 觸點(diǎn)額定電壓:6A @ 125VAC 觸動(dòng)器類型:扁平型 觸動(dòng)器長(zhǎng)度:11.38mm 發(fā)光:不發(fā)光 安裝類型:面板安裝 端接類型:焊片 軸襯螺紋:1/4-40 包裝:散裝
ST24T3H 032397 制造商:Comair Rotron 功能描述:FAN 80MM 24VDC
ST24T3H 制造商:Comair Rotron 功能描述:FAN 80MM 24VDC
ST24W01 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SERIAL 1K 128 x 8 EEPROM
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