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參數(shù)資料
| 型號(hào)： | ST24LC21 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 1Kb x8 DUAL MODE SERIAL EEPROM for VESA Plug&Play |
| 中文描述： | 1kB的x8串行EEPROM的雙模式為韋莎插頭 |
| 文件頁數(shù)： | 4/18頁 |
| 文件大?。?/td> | 149K |
| 代理商： | ST24LC21 |
Transmit Only Mode
After a Power-up, the device is in the Transmit Only
mode. A proper initialization sequence must supply
nine clock pulses on the VCLK pin (in order to
internally synchronize the device). During this in-
itialization sequence, the SDA pin is in high imped-
ance. On the rising edge of the tenth pulse applied
on VCLK pin, the device will output the first bit of
byte located at address 00h (most significant bit
first).
A byte is clocked out (on SDA pin) with nine clock
pulses on VCLK: 8 clock pulses for the data byte
and one extra clock pulse for a Don’t Care bit.
As long as the SCL pin is held high, each byte of
the memory array is transmitted serially on the SDA
pin with an automatic address increment.
When the last byte is transmitted, the address
counter will roll-over to location 00h.
I
2
C Bidirectional Mode
The device 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 device is in the I2C Bidirectional mode,
the VCLK input enables (or inhibits) the execution
of any write instruction: if VCLK = 1, write instruc-
tions are executed; if VCLK = 0, write instructions
are not executed.
The device is compatible with the I
2
C standard, two
wire serial interface which uses a bi-directional data
bus and serial clock. The device carries a built-in 4
bit, unique device identification code (1010) corre-
sponding to the I
2
C bus definition.
The device behaves as a slave device in the I
2
C
protocol with all memory operations synchronized
by the serial clock. Read and write operations are
initiated by a START condition generated by the
bus master. The START condition is followed by a
stream of 7 bits (identification code 1010XXX), plus
one read/write bit and terminated by an acknow-
ledge bit.
When writing data to the memory it responds to the
8 bits received by asserting an acknowledge bit
during the 9th bit time. When data is read by the
bus master, it acknowledges the receipt of the data
bytes in the same way. Data transfers are termi-
nated with a STOP condition.
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, the
internal reset is active, all operations 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.
AI01502
SCL
SDA
VCLK
Bi-Directional Mode
Transmit Only Mode
Figure 4. Transition Mode Waveforms
4/18
ST24LC21
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST24LC21B1TR | Controller IC; Package/Case:14-DIP; Leaded Process Compatible:Yes; Peak Reflow Compatible (260 C):No; Mounting Type:Through Hole |
| ST24LC21M1TR | Pulse Width Modulation (PWM) Controller IC; Topology:Push Pull; Control Mode:Current; Number of PWM Outputs:1; Input Voltage Primary Min:10V; Input Voltage Primary Max:120V; Duty Cycle Max:50%; Oscillator Frequency Max, Fosc:1MHz |
| ST2600C | MOSFET, N, SO-8; Transistor type:MOSFET; Current, Id cont:13.4A; Resistance, Rds on:0.009R; Voltage, Vgs Rds on measurement:4.5V; Case style:SO-8 PowerPak; Charge, gate n-channel:50nC; Current, Idm pulse:50A; Depth, external:5.26mm; RoHS Compliant: Yes |
| ST280S04P1V | PHASE CONTROL THYRISTORS Stud Version |
| ST280S06P1V | PHASE CONTROL THYRISTORS Stud Version |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST24LC21B | 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 |
| ST24LC21B1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:I2C Serial EEPROM |
| ST24LC21B1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1Kb x8 DUAL MODE SERIAL EEPROM for VESA Plug&Play |
| ST24LC21BB1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:I2C Serial EEPROM |
| ST24LC21BB1TR | 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 |
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