AT24C02A/04A/08A EEPROM: 256-8192位I2C存储器特性与应用
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更新于2024-07-28
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ATC4C02是一款由Atmel公司生产的高性能I2C接口电可擦除可编程只读存储器(EEPROM)，特别适用于工业和商业领域，具有多种特性使其在数据存储和保护方面表现出色。
首先，AT24C02A/04A/08A系列提供了256x8位（2K）、512x8位（4K）或1024x8位（8K）的内部组织，能够存储大量数据，满足不同应用场景的需求。该设备采用2线串行接口，使得通信效率高且连线简单，适合资源受限的系统。
写保护功能是该产品的一大亮点，通过WriteProtectPin，硬件数据保护得以实现，与AT24C02/04/08的传统阵列保护机制有所区别，确保了数据的安全性。它支持低电压和标准电压操作，包括5V、4.5V到5.5V、2.7V到5.5V、2.5V到5.5V和1.8V到5.5V的工作范围，适应各种电源环境。
通信方面，AT24C02采用施密特触发器和滤波输入，有助于抑制噪声，提供稳定的信号传输。其采用双向数据传输协议，兼容100kHz（在1.8V、2.5V和2.7V供电下）和400kHz（5V供电）的通信速度，支持灵活的数据交换。
写入模式多样，包括8字节/页（2K）、16字节/页（4K和8K），允许部分页面写入，节省时间和存储空间。此外，设备具备自我定时写周期功能，最大可达10ms，提高了数据写入的效率。对于可靠性，ATC4C02具有高耐用性，可以承受100万次写入循环，数据保留时间长达100年，同时提供超过3000伏的ESD防护，确保在严苛的工业环境下仍能稳定工作。
这款产品还针对汽车级应用和扩展温度范围进行了优化，提供8引脚JEDC SOIC、8引脚PDIP和8引脚TSSOP等多种封装选项，方便用户根据项目需求选择合适的封装形式。
ATC4C02是一款适用于工业控制、自动化设备、消费电子等多个领域的高效、可靠的EEPROM解决方案，其丰富的特性使其在低成本、高可靠性和多功能性上有着显著的优势。
AT24C02A/04A/08A
4
Note: 1. This parameter is characterized and is not 100% tested.
Device Operation
CLOCK and DATA TRANSITIONS:
The SDA pin is nor-
mally pulled high with an external device. Data on the SDA
pin may change only during SCL low time periods (refer to
Data Validity timing diagram). Data changes during SCL
high periods will indicate a start or stop condition as
defined below.
START CONDITION:
A high-to-low transition of SDA with
SCL high is a start condition which must precede any other
command (refer to Start and Stop Definition timing dia-
gram).
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 (refer to Start and Stop Definition timing diagram).
ACKNOWLEDGE:
All addresses and data words are seri-
ally transmitted to and from the EEPROM in 8 bit words
.
The
EEPROM sends a zero to acknowledge that it has
received each word. This happens during the ninth clock
cycle.
STANDBY MODE:
The AT24C02A/04A/08A 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.
MEMORY RESET:
After an interruption in protocol, power
loss or system reset, any 2-wire part can be reset by follow-
ing these steps:(a) Clock up to 9 cycles, (b) look for SDA
high in each cycle while SCL is high and then (c) create a
start condition as SDA is high.
AC Characteristics
Applicable over recommended operating range from T
A
= -40
°
C to +85
°
C, V
CC
= +1.8V to +5.5V, CL = 1 TTL Gate and
100 pF (unless otherwise noted).
Symbol Parameter
2.7-, 2.5-, 1.8-volt 5.0-volt
UnitsMin Max Min Max
f
SCL
Clock Frequency, SCL 100 400 kHz
t
LOW
Clock Pulse Width Low 4.7 1.2
µ
s
t
HIGH
Clock Pulse Width High 4.0 0.6
µ
s
t
I
Noise Suppression Time
(1)
100 50 ns
t
AA
Clock Low to Data Out Valid 0.1 4.5 0.1 0.9
µ
s
t
BUF
Time the bus must be free before
a new transmission can start
(1)
4.7 1.2
µ
s
t
HD.STA
Start Hold Time 4.0 0.6
µ
s
t
SU.STA
Start Set-up Time 4.7 0.6
µ
s
t
HD.DAT
Data In Hold Time 0 0
µ
s
t
SU.DAT
Data In Set-up Time 200 100 ns
t
R
Inputs Rise Time
(1)
1.0 0.3
µ
s
t
F
Inputs Fall Time
(1)
300 300 ns
t
SU.STO
Stop Set-up Time 4.7 0.6
µ
s
t
DH
Data Out Hold Time 100 50 ns
t
WR
Write Cycle Time 10 10 ms
Endurance
(1)
5.0V, 25
°
C, Page Mode 1M 1M
Write
Cycles
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