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參數(shù)資料
| 型號(hào)： | ST24XY21 |
| 英文描述： | IC MAX 7000 CPLD 128 84-PLCC |
| 中文描述： | 1kB的（× 8）串行EEPROM的雙模式的韋莎插頭 |
| 文件頁(yè)數(shù)： | 14/22頁(yè) |
| 文件大?。?/td> | 159K |
| 代理商： | ST24XY21 |
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the SDA signal must be stable during the clock low
to high transition and the data must change ONLY
when the SCL line is low.
Memory Addressing.
To start communication be-
tween the bus master and the slave ST24xy21, the
master must initiate a START condition. Following
this, the master sends onto the SDA bus line 8 bits
(MSB first) corresponding to the Device Select
code (7 bits) and a READ or WRITE bit. The 4 most
significant bits of the Device Select code are the
device type identifier, corresponding to the I
2
C bus
definition. For these memories the 4 bits are fixed
as 1010b. The 8th bit sent is the read or write bit
(RW), this bit is set to ’1’ for read and ’0’ for write
operations. If a match is found, the corresponding
memory will acknowledge the identification on the
SDA bus during the 9th bit time.
Write Operations
Following a START condition the master sends a
Device Select code with the RW bit set to ’0’. The
memory acknowledges this and waits for a byte
address. After receipt of the byte address the de-
vice again responds with an acknowledge.
In I
2
C bidirectional mode, any write command with
VCLK=0 (for the ST24LC21B and ST24FC21,
ST24FC21B) or with WC=0 (for the ST24LW21 and
ST24FW21) will not modify data and will be ac-
knowledged on data bytes, as shown in Figure 12.
Byte Write
. In the Byte Write mode the master
sends one data byte, which is acknowledged by the
WRITE Cycle
in Progress
AI01099B
Next
Operation is
Addressing the
Memory
START Condition
DEVICE SELECT
with RW = 0
ACK
Returned
YES
NO
YES
NO
ReSTART
STOP
Proceed
WRITE Operation
Proceed
Random Address
READ Operation
Send
Byte Address
First byte of instruction
with RW = 0 already
decoded by ST24xxx
Figure 10. Write Cycle Polling using ACK
14/22
ST24LC21B, ST24LW21, ST24FC21, ST24FC21B, ST24FW21
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST24LW21B6TR | 1 Kbit x8 Dual Mode Serial EEPROM for VESA PLUG & PLAY |
| ST24FW21B6TR | 1 Kbit x8 Dual Mode Serial EEPROM for VESA PLUG & PLAY |
| ST24FC21 | Isolated Flyback Switching Regulator with 9V Output |
| ST24FC21B | 1 Kbit x8 Dual Mode Serial EEPROM for VESA PLUG & PLAY |
| ST24FC21BM1TR | 1 Kbit x8 Dual Mode Serial EEPROM for VESA PLUG & PLAY |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST24Z02D00 | 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 |
| ST24Z04D00 | 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 |
| ST25 AUTOPRO | 制造商:RAYTEK 功能描述:THERMOMETER INFRARED 制造商:RAYTEK 功能描述:THERMOMETER, INFRARED 制造商:DANAHER - INDUSTRIAL/SPECIALTY 功能描述:THERMOMETER, INFRARED, Temperature Measuring Range:-30C to +200C, Accuracy %:1 制造商:RAYTEK 功能描述:THERMOMETER, INFRARED, Temperature Measuring Range:-30C to +200C, Accuracy %:1%, Operating Temperature Min:0C, Operating Temperature Max:50C, SVHC:No SVHC (20-Jun-2013), Operating Temperature Range:0C to +50C |
| ST250 | 制造商:DWYER INSTRUMENTS 功能描述:Thermometer, Surface Mount, 0 to 250 Deg. F/-20 to 120 Deg. C, +/-2% Accuracy |
| ST250/69/23 | 制造商:Block 功能描述:Control panel transformer, 250VA, 230V |
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