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EM4223V2WS11 参数 Datasheet PDF下载

EM4223V2WS11图片预览
型号: EM4223V2WS11
PDF下载: 下载PDF文件 查看货源
内容描述: 只读超高频射频识别设备 [Read-only UHF Radio Frequency Identification Device]
分类和应用: 射频
文件页数/大小: 29 页 / 426 K
品牌: EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
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R
EM4223  
Data coding  
Data transmitted by the Reader to the Tag is encoded in  
PIE format as described in 0 and 0 above. Four symbols  
are encoded; ‘0’, ‘1’, SOF and EOF. The Transponder is  
able to decode symbols having values as shown in Fig.  
10 below.  
Values  
falling  
outside  
of  
the  
limits  
in  
Table 17 will cause the received data to be rejected and  
the EM4223 to wait for an unmodulated carrier of EOF  
duration or greater before being ready to receive a new  
command.  
Symbol  
Mean  
duration  
1 Tari  
Limits  
Time interval in "Tari"  
1
2
3
4
Symbol  
'0'  
0
1
SOF  
½ Tari < ‘0’ 3/2 Tari  
3/2 Tari < ’1’ < 3 Tari  
Calibration sequence  
2 Tari  
1 Tari followed  
by 3 Tari  
'1'  
'EOF'  
'SOF'  
EOF  
4 Tari  
4 Tari  
Table 17 - PIE symbols  
Fig. 10 - PIE symbols  
Data Frame format  
The bits transmitted by the Reader to the Transponder  
are embedded in a frame as specified in Fig. 11. Before  
sending the frame, the Reader ensures that it has  
established an unmodulated carrier for duration of at  
least Taq (Quiet time) of 300µs.  
The frame consists of  
a
Start-Of-Frame (SOF),  
immediately followed by the data bits and terminated by  
an End-Of-Frame (EOF). After sending the EOF the  
Reader maintains a steady carrier for sufficient time to  
allow all Transponders present to be powered so that  
they may send their Reply.  
Taq  
3 Tari  
1Tari  
B
B
B
B
Quiet  
SOF  
EOF  
Command + Data  
Fig. 11 - Forward link frame format  
16  
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Copyright © 2005, EM Microelectronic-Marin SA  
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