- 您现在的位置：买卖IC网 > Sheet目录287 > 24LCS21A/P (Microchip Technology)IC EEPROM 1KBIT 400KHZ 8DIP
24LCS21A
3.0 BIDIRECTIONAL MODE
Before the 24LCS21A can be switched into the
Bidirectional mode (Figure 3-1), it must enter the Tran-
sition mode, which is done by applying a valid high-to-
low transition on the Bidirectional 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 con-
tents starting with the Most Significant bit in address
00h. However, if it detects the control byte on the I 2 C?
bus, (Figure 3-2) it will switch to the Bidirectional mode.
Once the device has made the transition to the Bidirec-
tional 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 Bidirectional
mode, the VCLK input is disregarded, with the
exception that a logic high level is required to enable
write capability. This mode supports a two-wire
Bidirectional 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 controlled by a master device that generates the
Bidirectional 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 Bidirectional mode, the 24LCS21A only responds
to commands for device ‘1010 000X’ .
FIGURE 3-1:
MODE TRANSITION WITH RECOVERY TO TRANSMIT-ONLY MODE
MODE
Transmit-Only
Bidirectional
TVHZ
Recovery to Transmit-Only mode
SCL
(MSB of data in 00h)
SDA
Bit 8
VCLK count =
1
2
3
4
1 2 7 1 2 8
VCLK
FIGURE 3-2:
SUCCESSFUL MODE TRANSITION TO BIDIRECTIONAL MODE
Transmit-Only
MODE
SCL
Transition mode with possibility to return to Transmit-Only mode
Bidirectional
permanently
SDA
S
1
0
1
0
0
0
0
0
ACK
VCLK count =
VCLK
1
2
n
0
n < 128
? 2007 Microchip Technology Inc.
DS21161H-page 5
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
24LCS22A-I/P
IC EEPROM 2KBIT 400KHZ 8DIP
24VL014/SN
IC EEPROM 1KBIT 400KHZ 8SOIC
24VL014H/SN
IC EEPROM 1KBIT 400KHZ 8SOIC
24VL024/SN
IC EEPROM 2KBIT 400KHZ 8SOIC
24VL024H/SN
IC EEPROM 2KBIT 400KHZ 8SOIC
25A512-I/ST
IC EEPROM 512K SPI BUS 8TSSOP
25AA020A-I/MS
IC EEPROM 2KBIT 10MHZ 8MSOP
25AA02E48-I/SN
IC EEPROM 2KBIT 10MHZ 8SOIC
相关代理商/技术参数
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:电可擦除可编程只读存储器 2.5V Dual Mode RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体: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
24LCS21A-I/P
功能描述:电可擦除可编程只读存储器 2.5V Dual Mode RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
24LCS21A-I/PG
功能描述:电可擦除可编程只读存储器 2.5V Dual Mode Lead Free Package
RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
24LCS21A-I/SN
功能描述:电可擦除可编程只读存储器 2.5V Dual Mode RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
24LCS21A-I/SNG
功能描述:电可擦除可编程只读存储器 2.5V Dual Mode Lead Free Package RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8