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參數(shù)資料
| 型號(hào)： | ST24FW21M1 |
| 英文描述： | IC ACEX 1K FPGA 50K 208-PQFP |
| 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： | ST24FW21M1 |
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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 |
|---|---|
| ST24FW21M6 | MAX II CPLD 570 LE 144-TQFP |
| ST24LC21BB1 | MAX 3000A CPLD 32 MC 44-PLCC |
| ST24LC21BB6 | IC ACEX 1K FPGA 100K 208-PQFP |
| ST24LC21BM1 | CONFIGURATION DEVICE, 440KBIT, TQFP32; Memory type:Configuration EPROM; Interface type:Serial; Memory size:430Kbit; Memory configuration:54KB; Frequency:16.7MHz; Temp, op. min:0(degree C); Temp, op. max:70(degree C); Case style:TQFP; RoHS Compliant: Yes |
| ST24LC21BM6 | IC CONFIG DEVICE 16MBIT 100-PQFP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST24FW21M1TR | 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 |
| ST24FW21M6 | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:I2C Serial EEPROM |
| ST24FW21M6TR | 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 |
| ST24GD00 | 功能描述:撥動(dòng)開(kāi)關(guān) 20A 2HPDP On-On RoHS:否 制造商:C&K Components 觸點(diǎn)形式:DPDT 開(kāi)關(guān)功能:ON - ON - ON 電流額定值: 電壓額定值 AC:20 V 電壓額定值 DC:20 V 功率額定值:0.4 VA 端接類(lèi)型:V-Bracket 安裝風(fēng)格: 端子密封:Epoxy 觸點(diǎn)電鍍:Gold 照明:Not Illuminated |
| ST24JD00 | 功能描述:撥動(dòng)開(kāi)關(guān) TOGGLE RoHS:否 制造商:C&K Components 觸點(diǎn)形式:DPDT 開(kāi)關(guān)功能:ON - ON - ON 電流額定值: 電壓額定值 AC:20 V 電壓額定值 DC:20 V 功率額定值:0.4 VA 端接類(lèi)型:V-Bracket 安裝風(fēng)格: 端子密封:Epoxy 觸點(diǎn)電鍍:Gold 照明:Not Illuminated |
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