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參數(shù)資料
| 型號(hào)： | ST24FC21BB1TR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 1 Kbit x8 Dual Mode Serial EEPROM for VESA PLUG & PLAY |
| 中文描述： | 1千位x8雙模式串行EEPROM的韋莎插頭 |
| 文件頁(yè)數(shù)： | 7/22頁(yè) |
| 文件大小： | 159K |
| 代理商： | ST24FC21BB1TR |
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AI01665
VCC
CBUS
SDA
RL
MASTER
RL
SCL
CBUS
100
0
4
8
12
16
20
CBUS (pF)
M
)
10
1000
fc = 400kHz
fc = 100kHz
Figure 6. Maximum R
L
Value versus Bus Capacitance (C
BUS
) for an I
2
C Bus
When the ST24FC21 (or the ST24FC21B or the
ST24FW21) first switches to the I
2
C mode (VESA
DDC2B mode), it enters a transition state which is
functionally identical to I
2
C operation. But, if the
ST24FC21 (or the ST24FC21B or the ST24FW21)
does not receive a valid I
2
C sequence, that is a
START condition followed by a valid Device Select
code (1010XXX RW for ST24FC21 and
ST24FW21; 1010000 RW for ST24FC21B), within
either 128 VCLK periods or a period of time of
t
RECOVERY
(approximately 2 seconds), the
ST24FC21 (or the ST24FC21B or the ST24FW21)
will revert to the Transmit-Only mode (VESA DDC1
mode).
If the ST24FC21 (or the ST24FC21B or the
ST24FW21) decodes a valid I
2
C Device Select
code, it will lock into I
2
C mode. Under this condition,
signals applied on the VCLK input will not disturb
READ access from the ST24FC21 (or the
ST24FC21B or the ST24FW21). For WRITE ac-
cess, refer to the Signal Description paragraph.
When in the transition state, the count of VCLK
pulses and the internal 2 seconds timer are reset
by any activity on the SCL line. This means that,
after each high to low transition on SCL, the mem-
ory will re-initialise its transition state and will switch
back to Transmit-Only mode only after 128 more
VCLK pulses or after a new t
RECOVERY
delay.
SIGNAL DESCRIPTIONS
I
2
C Serial Clock (SCL).
The SCL input pin is used
to synchronize all data in and out of the memory. A
resistor can be connected from the SCL line to V
CC
to act as a pull up (see Figure 6).
Serial Data (SDA).
The SDA pin is bi-directional
and is used to transfer data in or out of the memory.
It is an open drain output that may be wire-OR’ed
with other open drain or open collector signals on
the bus. A resistor must be connected from the SDA
bus line to V
CC
to act as pull up (see Figure 6).
Transmit Only Clock (VCLK)
. The VCLK input pin
is used to synchronize data out when the ST24xy21
is in Transmit Only mode.
For the ST24LC21B and the ST24FC21 or
ST24FC21B Only, the VCLK offers also a Write
Enable (active high) function when the ST24LC21B
and the ST24FC21 or ST24FC21B are in I
2
C bidi-
rectional mode.
Write Control (WC).
An hardware Write Control
feature (WC) is offered only on ST24LW21 and
ST24FW21 on pin 3. This feature is usefull to
protect the contents of the memory from any erro-
neous erase/write cycle. The Write Control signal
is used to enable (WC = V
IL
) or disable (WC = V
IH
)
the internal write protection. When unconnected,
the WC input is internally tied to V
SS
by a 100k ohm
pull-down resistor and the memory is write pro-
tected.
DEVICE OPERATION
7/22
ST24LC21B, ST24LW21, ST24FC21, ST24FC21B, ST24FW21
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST24LC21BB6TR | ECONOLINE: REC5-S_DRW(Z)/H4,H6 - Safety standards and approval: EN 60950 certified, rated for 250VAV (LVD test report)- Applied for Ul 1950 Component Recognised Certification- 5W DIP Package- 4kVDC & 6kVDC Isolation- Regulated Output- Continuous Short Circiut Protection Auto-Restarting |
| ST24FC21BB6TR | 1 Kbit x8 Dual Mode Serial EEPROM for VESA PLUG & PLAY |
| ST24FC21B1TR | 1 Kbit x8 Dual Mode Serial EEPROM for VESA PLUG & PLAY |
| ST24FC21B6TR | 1 Kbit x8 Dual Mode Serial EEPROM for VESA PLUG & PLAY |
| ST24FC21M1TR | 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 |
|---|---|
| ST24FC21BB6TR | 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 |
| ST24FC21BM1TR | 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 |
| ST24FC21BM6TR | 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 |
| ST24FC21M1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:I2C Serial EEPROM |
| ST24FC21M1TR | 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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