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參數(shù)資料
EM4450
EM4550
Copyright
2003, EM Microelectronic-Marin SA
6
www.emmicroelectronic.com
Read Sequence
POR
OUTPUT
LIW
D0-D7
P0
D8-D15
P1 D16-D23 P2 D24-D31 P3 PC0-PC7 "0"
T0 = Period of RF carrier
frequency
INIT
LIW
FWR
LIW FWR+1
LWR LIW
FWR
LIW
LIW
LIW
Coded Data
Data
1 bit = 64 T0 periods (Opt64)
32 T0 periods (Opt32)
T0 periods :
32 32
16 16
128
64
64
32
64 (Opt64)
32 (Opt32)
1 bit
1 bit
1 bit
1 bit
Fig. 7
Receive Mode
To activate the Receive Mode, the Transceiver sends to the chip the RM pattern (while in the modulated phase of a Listen
Window LIW). The EM4450/4550 will stop sending data upon reception of a valid RM. The chip then expects a command.
The RM pattern consists of 2 bits "0" sent by the transceiver. The first bit "0" transmitted is to be detected during the 64 (32
opt 32) periods where the modulation is "ON" in LIW.
Fig. 8
Commands
The commands are composed of nine bits : eight data bits and one even parity bit (total amount of "ones" is even including
the parity bit).
Fig. 9
WORD n LIW
RM COMMAND
output
input
COMMAND BITS FUNCTION
0 0 0 0 0 0 0 1 1 LOGIN
0 0 0 1 0 0 0 1 0 WRITE PASSWORD
0 0 0 1 0 0 1 0 0 WRITE WORD
0 0 0 0 1 0 1 0 0 SELECTIVE READ MODE
1 0 0 0 0 0 0 0 1 RESET
First bit Received
Parity bit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EM4550A5WW7 | 1 KBit Read/Write Contactless Identification Device |
| EM4550A5WW7E | 1 KBit Read/Write Contactless Identification Device |
| EM4550A6WS11 | 1 KBit Read/Write Contactless Identification Device |
| EM4550A6WS11E | 1 KBit Read/Write Contactless Identification Device |
| EM4550A6WS27 | 1 KBit Read/Write Contactless Identification Device |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EM4550A5WW7 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:1 KBit Read/Write Contactless Identification Device |
| EM4550A5WW7E | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:1 KBit Read/Write Contactless Identification Device |
| EM4550A6WS11 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:1 KBit Read/Write Contactless Identification Device |
| EM4550A6WS11E | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:1 KBit Read/Write Contactless Identification Device |
| EM4550A6WS27 | 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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