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參數(shù)資料
| 型號： | EM4469V2WT7 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 512 bit Read/Write Contactless Identification Device |
| 中文描述： | 512位讀/寫非接觸式識別裝置 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 305K |
| 代理商： | EM4469V2WT7 |
EM4469
Copyright
2003, EM Microelectronic-Marin SA
7
www.emmicroelectronic.com
EM4050 Code (figure 5)
At reception of the first field stop, the chip stops
immediately the reading and expects then another bit "0"
to switch to receive mode. The transceiver and the chip
are now synchronised and further data is sent with a bit
rate of 32 periods of the RF field.
The EM4469 turns "ON" its modulator at the beginning of
each frame of 32 clock periods corresponding to one bit.
To send a logic "1" bit, the transceiver continues to send
clocks without modulation. After 16 clocks, the
modulation device of is turned "OFF" allowing recharge
of the internal supply capacitor. To send a logic "0" bit,
the transceiver stops sending clocks (100% modulation)
during the first half of a bit period (first 16 periods with
modulation device ON). In order to correctly detect the
field "OFF" the transceiver must wait that modulation
device switch ON before turning "OFF" the field. It is
recommended to turn "OFF" the field after 4 clocks of the
bit period, the minimum requirement is 1. In the
recommended case the field is stopped from clock 5 to
16 of the bit period, and then turned "ON" again for the
remaining 16 periods.
While the transceiver is sending data to the transponder,
two different modulations will be observed on both coils.
During the first 16 clocks of a bit period, the EM4469 is
switching "ON" its modulation device causing a
modulation of the RF field. This modulation can also be
observed on the transceiver's coil. To send a bit "0" the
transceiver will switch "OFF" the field, and this 100%
modulation will be observed on the transponder coil.
Transceiver
Coil
Transponder
Coil
"1"
"1"
"1"
"0"
"0"
"0"
16
16
Periods of RF field (Opt 32):
Bit Period
DATA :
Modulation induced by the Transceiver
Modulation induced by the Transponder
16
*
*
Recommended
Minimum
: 7/4 periods (Opt64/Opt32)
: 1 period
16
Periods of RF field (Opt 64):
32
32
32
32
Opt64 is the chip option with a bit period corresponding to 64 priods of the RF field
Opt32 is the chip option with a bit period corresponding to 32 priods of the RF field
Fig.5
Commands
Command structure:
All commands start by 3 bit command code, followed by
command arguments. Possible command arguments are
a word address and a 32 bit data field.
The 3 bit command code is terminated by an even parity
bit.
The address field contains 4 bit address, two bits at 0
reserved for future extension and an even parity bit.
The 32 bit data field has an even parity bit inserted every
8 data bits, data is terminated with 8 column parity bits
and a 0. The figures below represent the organisation of
command fields.
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