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參數(shù)資料
| 型號： | EM4469V3WW11 |
| 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)： | 3/11頁 |
| 文件大小： | 305K |
| 代理商： | EM4469V3WW11 |
EM4469
Copyright
2003, EM Microelectronic-Marin SA
3
www.emmicroelectronic.com
Block Diagram
Fig. 2
Functional Description
The IC builds its power supply through an integrated
rectifier. When it is placed in a magnetic field the DC
internal voltage starts to increase.
As long the power supply is lower than the power on
reset (POR) threshold, the circuit is in reset mode to
prevent unreliable operation. In this mode the Modulator
is off.
After the supply voltage cross the POR threshold, the
circuit reads configuration word and then enters in default
read mode according to configuration just read. During
the configuration word readout the Modulator is also off.
While the IC is operating in Default Read mode it checks
the coil signal to detect eventual command from reader.
In the case reader field stops for a period longer then
T
MONO
it interrupts read mode and expects reader to send
the command. In the case a valid command pattern is
detected the command is executed. After execution of
command the default read mode is entered.
Block Description
Power Supply
This block integrates an AC/DC converter, which extracts
the DC power from the incident RF field. It will also acts
as limiter, which clamps the voltage on coil terminals to
avoid chip destruction in strong RF fields.
Power On Reset (POR)
When the EM4469 with its attached coil enters an
electromagnetic field, the built in AC/DC converter will
supply the chip. The DC voltage is monitored and a
Reset signal is generated to initialise the logic. The
Power On Reset is also provided in order to make sure
that the chip will start issuing correct data.
Hysteresis is provided to avoid improper operation at the
limit level.
VPOR
t
Reset
VDD
t
Hysteresis
EM4469
Active
Fig. 3
Clock Extractor
The Clock extractor will generate a system clock with a
frequency corresponding to the frequency of the RF field
(f
RF
). The system clock is used by a sequencer to
generate all internal timings.
Data Extractor
The transceiver generated field will be amplitude
modulated (field stops) to transmit data to the EM4469.
The Data extractor detects absence of signal on coil
terminals for period longer then T
MONO
.
Modulator
The Data Modulator is driven by Logic. When Modulator
is switched ON it will draw a large current from both coil
terminals, thus amplitude modulating the RF field.
Power Check
This block is used to check whether there is enough
power available to securely write EEPROM.
Modulator
Logic
EEPROM
Clock
Extractor
Data
Extractor
V
POS
V
SS
Power
Supply
Reset
Power on
Reset
COIL1
C
R
C
buf
COIL2
Power
Check
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