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參數(shù)資料
| 型號(hào)： | 24LCS21A |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 1K 2.5V Dual Mode I 2 C Serial EEPROM |
| 中文描述： | 一千2.5V的雙模式的I 2 C串行EEPROM |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 115K |
| 代理商： | 24LCS21A |
1996 Microchip Technology Inc.
Preliminary
DS21161C-page 5
24LCS21A
3.0
BI-DIRECTIONAL MODE
Before the 24LCS21A can be switched into the Bi-
directional Mode (Figure 3-1), it must enter the transi-
tion mode, which is done by applying a valid high to low
transition on the Bi-directional Mode Clock (SCL). As
soon it enters the transition mode, it looks for a control
byte 1010 000X on the I
2
C
bus, and starts to count
pulses on VCLK. Any high to low transition on the SCL
line will reset the count. If it sees a pulse count of 128
on VCLK while the SCL line is idle, it will revert back to
the Transmit-Only Mode, and transmit its contents start-
ing with the most significant bit in address 00h. How-
ever, if it detects the control byte on the I
2
C
bus,
(Figure 3-2) it will switch to the in the Bi-directional
Mode. Once the device has made the transition to the
Bi-directional mode, the only way to switch the device
back to the Transmit-Only Mode is to remove power
from the device. The mode transition process is shown
in detail in Figure 3-3.
Once the device has switched into the Bi-directional
Mode, the VCLK input is disregarded, with the excep-
tion that a logic high level is required to enable write
capability. This mode supports a two-wire Bi-directional
data transmission protocol (I
2
C
). In this protocol, a
device that sends data on the bus is defined to be the
transmitter, and a device that receives data from the
bus is defined to be the receiver. The bus must be con-
trolled by a master device that generates the Bi-direc-
tional Mode Clock (SCL), controls access to the bus
and generates the START and STOP conditions, while
the 24LCS21A acts as the slave. Both master and
slave can operate as transmitter or receiver, but the
master device determines which mode is activated. In
the Bi-directional mode, the 24LCS21A only responds
to commands for device 1010 000X.
FIGURE 3-1:
MODE TRANSITION WITH RECOVERY TO TRANSMIT-ONLY MODE
FIGURE 3-2:
SUCCESSFUL MODE TRANSITION TO BI-DIRECTIONAL MODE
TVHZ
SCL
SDA
VCLK
Transmit
Only
MODE
Bi-directional
Recovery to Transmit-Only Mode
Bit8
(MSB of data in 00h)
VCLK count = 1 2 3 4 127 128
Transition Mode with possibility to return to Transmit-Only Mode
Bi-directional
permanently
SCL
SDA
VCLK count = 1 2 n 0
VCLK
Transmit
Only Mode
MODE
S
1
0
1
0
0
0
0
0
ACK
n < 128
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 24LCS21 | 1K 2.5V Dual Mode I 2 C Serial EEPROM |
| 24LCS41A | 1K/4K 2.5V Dual Mode, Dual Port IIC Serial EEPROM(1K/4K位,2.5V雙模式,雙端口IIC串行EEPROM) |
| 24LCS41 | 1K/4K 2.5V Dual Mode, Dual Port IIC Serial EEPROM(1K/4K位,2.5V雙模式,雙端口IIC串行EEPROM) |
| 24LCS52 | Connectors |
| 24LC52-IP | 2K 2.5V I 2 C Serial EEPROM with Software Write Protect |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 24LCS21A/P | 功能描述:電可擦除可編程只讀存儲(chǔ)器 2.5V Dual Mode RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24LCS21A/S | 制造商:Microchip Technology Inc 功能描述:1K 2.5V DUAL MODE SERIAL EEPRO - Gel-pak, waffle pack, wafer, diced wafer on film |
| 24LCS21A/SN | 功能描述:電可擦除可編程只讀存儲(chǔ)器 2.5V Dual Mode RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24LCS21A/W | 制造商:Microchip Technology Inc 功能描述:1K 2.5V DUAL MODE SERIAL EEPROM WAFER - Gel-pak, waffle pack, wafer, diced wafer on film |
| 24LCS21A/WF | 制造商:Microchip Technology Inc 功能描述:1K 2.5V DUAL MODE SERIAL EEPRO - Gel-pak, waffle pack, wafer, diced wafer on film |
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