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CAT28LV65
Software Data Protection
To activate the software data protection, the device must
be sent three write commands to specific addresses with
specific data (Figure 10). This sequence of commands
(along with subsequent writes) must adhere to the page write
timing specifications (Figure 12). Once this is done, all
subsequent byte or page writes to the device must be
preceded by this same set of write commands. The data
protection mechanism is activated until a deactivate
sequence is issued regardless of power on/off transitions.
This gives the user added inadvertent write protection on
power ? up in addition to the hardware protection provided.
To allow the user the ability to program the device with an
EEPROM programmer (or for testing purposes) there is a
software command sequence for deactivating the data
protection. The six step algorithm (Figure 11) will reset the
internal protection circuitry, and the device will return to
standard operating mode (Figure 13 provides reset timing).
After the sixth byte of this reset sequence has been issued,
standard byte or page writing can commence.
DATA
ADDRESS
CE
AA
1555
55
0AAA
A0
1555
BYTE OR
PAGE
t WC
t WP
t BLC
WRITES
ENABLED
WE
Figure 12. Software Data Protection Timing
DATA
ADDRESS
AA
1555
55
0AAA
80
1555
AA
1555
55
0AAA
20
1555
t WC
SDP
RESET
CE
DEVICE
UNPROTECTED
WE
Figure 13. Resetting Software Data Protection Timing
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相关代理商/技术参数
CAT28LV65WI-25
制造商:Catalyst Semiconductor 功能描述:
CAT28LV65WI-25T
功能描述:电可擦除可编程只读存储器 64K-Bit CMOS PARA 电可擦除可编程只读存储器 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
CAT28LV65XI-15
制造商:Rochester Electronics LLC 功能描述: 制造商:Catalyst Semiconductor 功能描述:
CAT30/41316L
制造商:MISCELLANEOUS 功能描述:
CAT-3000-01
制造商:Samtec Inc 功能描述:CAT - Bulk
CAT-3000-02
制造商:Samtec Inc 功能描述:CAT - Bulk
CAT310
制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:10 Channel Automotive LED Display Driver
CAT310_07
制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:10 Channel Automotive LED Display Driver
