STOP CONDITION: A low-to-high transition of SDA with SCL high is a stop condition. After a
read sequence, the Stop command will place the EEPROM in a standby power mode (see Fig-
ure 4-5 on page 8 ).
ACKNOWLEDGE: All addresses and data words are serially transmitted to and from the
EEPROM in 8-bit words. The EEPROM sends a zero during the ninth clock cycle to acknowl-
edge that it has received each word.
STANDBY MODE: The AT24C1024B features a low-power standby mode which is enabled: a)
upon power-up and b) after the receipt of the stop bit and the completion of any internal
operations.
SOFTWARE RESET: After an interruption in protocol, power loss or system reset, any 2-wire
part can be protocol reset by following these steps: (a) Create a start bit condition, (b) clock 9
cycles, (c) create another start bit followed by stop bit condition as shown below. The device is
ready for next communication after above steps have been completed.
Figure 4-1.
Software Reset
Start bit
Dummy Clock Cycles
Start bit
Stop bit
SCL
1
2
3
8
9
SDA
Figure 4-2.
Bus Timing (SCL: Serial Clock, SDA: Serial Data I/O ? )
t F
t HIGH
t R
SCL
t LOW
t LOW
t SU.STA
t HD.STA
t HD.DAT
t SU.DAT
t SU.STO
SDA IN
6
SDA OUT
AT24C1024B
t AA
t DH
t BUF
5194F–SEEPR–1/08
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AT24C1024B-W-11 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Two-wire Serial EEPROM 1M (131,072 x 8)
AT24C1024BW-SH25-B 功能描述:电可擦除可编程只读存储器 1024K 2-WIRE 131072 x 8 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
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