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S-24CS08AFJ-TB-1G 参数 Datasheet PDF下载

S-24CS08AFJ-TB-1G图片预览
型号: S-24CS08AFJ-TB-1G
PDF下载: 下载PDF文件 查看货源
内容描述: CMOS 2线串行E2PROM [2-WIRE CMOS SERIAL E2PROM]
分类和应用: 内存集成电路光电二极管ISM频段可编程只读存储器电动程控只读存储器电可擦编程只读存储器时钟
文件页数/大小: 47 页 / 682 K
品牌: SII [ SEIKO INSTRUMENTS INC ]
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2-WIRE CMOS SERIAL E2PROM  
S-24CS01A/02A/04A/08A  
Rev.4.4_00  
6. 3 Write Protection  
Write protection is available in the S-24CS01A/02A/04A/08A. When the WP pin is connected to the VCC,  
write operation to memory area is forbidden at all.  
When the WP pin is connected to the GND, the write protection is invalid, and write operation in all  
memory area is available.  
Fix the level of the WP pin from the rising edge of SCL for loading the last write data (D0) until the end of  
the write time (10 ms max.). If the WP pin changes during this time, the address data being written at this  
time is not guaranteed.  
There is no need for using write protection, the WP pin should be connected to the GND. The write  
protection is valid in the operating voltage range.  
tWR  
SCL  
SDA  
WP  
D0  
Stop  
Start  
Condition  
Condition  
Write Data  
Acknowledge  
WP Pin Fixed Period  
Figure 15 WP Pin Fixed Period  
6. 4 Acknowledge Polling  
Acknowledge polling is used to know the completion of the write cycle in the E2PROM.  
After the E2PROM receives a stop condition and once starts the write cycle, all operations are forbidden  
and no response is made to the signal transmitted by the master device.  
Accordingly the master device can recognize the completion of the write cycle in the E2PROM by  
detecting a response from the slave device after transmitting the start condition, the device address and  
the read/write instruction code to the E2PROM, namely to the slave devices.  
That is, if the E2PROM does not generate an acknowledge, the write cycle is in progress and if the  
E2PROM generates an acknowledge, the write cycle has been completed.  
Keep the level of the WP pin fixed until acknowledge is confirmed.  
It is recommended to use the read instruction "1" as the read/write instruction code transmitted by the  
master device.  
15  
Seiko Instruments Inc.