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參數(shù)資料
| 型號： | EM4450A6WT27E |
| 廠商： | EM Microelectronic |
| 英文描述： | 1 KBit Read/Write Contactless Identification Device |
| 中文描述： | 1千位讀/寫非接觸式識別裝置 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 230K |
| 代理商： | EM4450A6WT27E |
EM4450
EM4550
Copyright
2003, EM Microelectronic-Marin SA
4
www.emmicroelectronic.com
Timing Characteristics
V
DD
=2.5V, V
SS
=0V , f
coil
= 125 kHz Sine wave, V
coil
= 1V
pp
, T
op
= 25°C unless otherwise specified
All timings are derived from the field frequency and are specified as a number of RF periods..
Parameter
Symbol
Option : 64 clocks per bit
Opt64
Read Bit Period
t
rdb
LIW/ACK/NACK pattern duration
t
patt
Read 1 Word Duration
t
rdw
Processing Pause Time
t
pp
Write Access Time
t
wa
Initialization Time
t
init
EEPROM write time
t
wee
Option : 32 clocks per bit
Opt32
Read Bit Period
t
rdb
LIW/ACK/NACK pattern duration
t
patt
Read 1 Word Duration
t
rdw
Processing Pause Time
t
pp
Write Access Time
t
wa
Initialization Time
t
init
EEPROM write time
t
wee
Conditions
Value
Unit
64
320
3200
64
64
2112
3200
RF periods
RF periods
RF periods
RF periods
RF periods
RF periods
RF periods
including LIW
V
DD
= 3V
32
160
1600
32
32
1056
2624
RF periods
RF periods
RF periods
RF periods
RF periods
RF periods
RF periods
including LIW
V
DD
= 3V
RF periods represent periods of the carrier frequency emitted by the transceiver unit. For example, if 125 kHz is used :
The Read bit period (Opt64) would be : 1/125'000*64 = 512 μs, and the time to read 1 word : 1/125'000*3200 = 25.6 ms.
The Read bit period (Opt32) would be : 1/125'000*32 = 256 μs, and the time to read 1 word : 1/125'000*1600 = 12.8 ms.
ATTENTION
Due to amplitude modulation of the coil-signal, the clock-extractor may miss clocks or add spurious clocks close
to the edges of the RF-envelope. This desynchronisation will not be larger than ±3 clocks per bit and must be
taken into account when developing reader software.
Functional Description
General
The EM4450/4550 is supplied by means of an electromagnetic field induced on the attached coil. The AC voltage is rectified
in order to provide a DC internal supply voltage. When the DC voltage crosses the Power-On level, the chip enters the
Standard Read Mode and sends data continuously. The data to be sent in this mode is user defined by storing the first and
last addresses to be output. When the last address is sent, the chip will continue with the first address until the transceiver
sends a request. In the read mode, a Listen Window (LIW) is generated before each word. During this time, the
EM4450/4550 will turn to the Receive Mode (RM) if it receives a valid RM pattern. The chip then expects a valid command.
Mode of Operation
Fig. 4
Get Command
Standard
Read Mode
Send word
Power-On
Write Word
Write Password
Selective Read
Login
YES
NO
Receive
Mode
request
Reset
Execute Command
Init
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| EM4450A6WT7 | 1 KBit Read/Write Contactless Identification Device |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| EM4450A6WT6 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:1 KBit Read/Write Contactless Identification Device |
| EM4450A6WT6E | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:1 KBit Read/Write Contactless Identification Device |
| EM4450A6WT7 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:1 KBit Read/Write Contactless Identification Device |
| EM4450A6WT7E | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:1 KBit Read/Write Contactless Identification Device |
| EM4450A6WW11 | 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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