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參數(shù)資料
| 型號(hào)： | EM4550A5WS27E |
| 廠商： | EM Microelectronic |
| 英文描述： | 1 KBit Read/Write Contactless Identification Device |
| 中文描述： | 1千位讀/寫非接觸式識(shí)別裝置 |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大小： | 230K |
| 代理商： | EM4550A5WS27E |
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EM4450
EM4550
Copyright
2003, EM Microelectronic-Marin SA
9
www.emmicroelectronic.com
After reception of the command, the address, and the data, the EM4450/4550 will check the parity, the write protection
status, the Login status, and also if the available power from the RF field is sufficient. If all the conditions are satisfied, an
acknowledge pattern (ACK) will be issued afterward and the EEPROM writing process will start. At the end of programming,
the chip will send an Acknowledge pattern (ACK). If at least one of the checks fails, the chip will issue a no acknowledge
pattern (NAK) instead of ACK and return to the Standard Read Mode. The Transceiver will keep the RF field permanently
"ON" during the whole writing process time.
The Read After Write function (bit 17 of Control word) controls the mode of operation following a write operation. When
"ON" the latest written word will be read out and output next to the ACK pattern and two Listen Windows (LIW-LIW) even if
the word is read protected. When "OFF", the ACK is followed immediately by a LIW-LIW and FWR. The last written word is
not output.
If a request from the transceiver to return in receive mode (RM) is generated during the LIW, another word can be written in.
Otherwise, the EM4450/4550 will return in the Standard Read Mode.
Fig. 16
WORD n LIW
ACK LIW LIW FWR
output
input
ACK
t
wa
t
wee
TRANSCEIVER RF FIELD "ON"
WORD n LIW
output
input
RM WRITE WORD ADDRESS DATA
ACK LIW
ACK
t
wa
t
wee
TRANSCEIVER RF FIELD "ON"
Write 1 word
Write severalwords
RM WRITE WORD ADDRESS DATA
RM WRITE WORD ADDRESS DATA
WORD n LIW
ACK LIW LIW Last Written LIW LIW FWR
output
input
ACK
t
wa
t
wee
TRANSCEIVER RF FIELD "ON"
Read After Write function
RM WRITE WORD ADDRESS DATA
WORD n LIW
NACK LIW LIW FWR
output
input
t
wa
TRANSCEIVER RF FIELD "ON"
Write not allowed or wrong transmission
RM WRITE WORD ADDRESS DATA
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| EM4550A5WS6 | 1 KBit Read/Write Contactless Identification Device |
| EM4550A5WS6E | 1 KBit Read/Write Contactless Identification Device |
| EM4550A5WS7 | 1 KBit Read/Write Contactless Identification Device |
| EM4550A5WS7E | 1 KBit Read/Write Contactless Identification Device |
| EM4550A5WT11 | 1 KBit Read/Write Contactless Identification Device |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EM4550A5WS6 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:1 KBit Read/Write Contactless Identification Device |
| EM4550A5WS6E | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:1 KBit Read/Write Contactless Identification Device |
| EM4550A5WS7 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:1 KBit Read/Write Contactless Identification Device |
| EM4550A5WS7E | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:1 KBit Read/Write Contactless Identification Device |
| EM4550A5WT11 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:1 KBit Read/Write Contactless Identification Device |
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