|
|
PDF MLX90109 Data sheet ( Hoja de datos )
| Número de pieza | MLX90109 | |
| Descripción | 125kHz RFID Transceiver | |
| Fabricantes | Melexie | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MLX90109 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
|
No Preview Available !
MLX90109
125kHz RFID Transceiver
Features and Benefits
Integrated RFID transceiver
Addressing 100kHz to 150kHz frequency range transponder.
Biphase and Manchester ASK.
ON/OFF keying modulation.
Low Power and high performance
Unique Parallel Antenna concept for maximum power efficiency.
Power down mode available.
Baud rate selectable “on-chip” filtering for maximum sensitivity.
No zero modulation problems.
Low cost and compact design
SO8 package and high level of integration for compact reader design.
No external quartz reference required, only 2 resistors plus antenna.
On chip decoding for fast system design and ease of use.
Open drain data and clock outputs for 2-wire serial communication.
Applications Examples
Car Immobilizers
Portable readers
Access control
House held appliances
Ordering Code
Product Code Temperature Code
MLX90109
E
MLX90109
E
MLX90109
C
MLX90109
C
Package Code
DC
DC
DC
DC
Option Code
AAA-000
AAA-000
AAA-000
AAA-000
Packing Form Code
RE
TU
RE
TU
Legend:
Temperature Code:
Package Code:
Packing Form:
E for Temperature Range -40°C to 85°C
C for Temperature Range 0°C to 70°C
DC for SOIC150Mil
RE for Reel, TU for Tube
Ordering example:
MLX90109EDC-AAA-000-RE
3901090109
Rev 011
Page 1 of 16
Data Sheet
Jun/12
1 page  
MLX90109
125kHz RFID Transceiver
5 MLX90109 Electrical Specifications
DC Operating Parameters TA = -40oC to 85oC, Fres = 125kHz, VDD = 3.1 to 5.5V
Antenna parameters: Lant = 73.6uH, Qant =17.3Ω, Zant=1kΩ
Parameter.
Symbol Test Conditions
Min Typ Max Units
Supply Voltage
Resonance Frequency
Frequency drift with temperature
Sensitivity (note 1)
Amplitude Offset (note 2)
Power down voltage
(on MODU pin)
Power up voltage
(on MODU pin)
Power down Current
Supply Current (excluding
antenna supply current) (note 3)
Antenna supply current (note 4)
Leakage current on pins COIL,
MODE, SPEED, MODE, DATA
Output voltage DATA and
CLOCK pin
Table 3: Electrical specifications
VDD
Fres
(Depends on the resonance
frequency of the antenna)
∆ Fres (T)
Vsens
Vos
Vpd
Vpu
IDD,pn
Fres = 125 kHz
(Depends on the application)
VDD=5V
VDD=3.1V
VDD=5V
VDD=3.1V
VMODU = VDD
IDD VDD=5V, VMODU = 0.8V
IDD,ant
(Depends on the application)
Ileak (Power down)
Vol Pull-up resistance Rpu > 2kΩ
3.1
100
-1
0
4.0
2.2
3.2
1.3
0
125
10
0.15
1.8
2.8
5.5
150
+1
30
0.35
4.9
3.0
4.3
2.4
1.5
3.0
1.0
0.4
V
kHz
%
mVpp
V
V
V
µA
mA
mA
µA
V
Note 1: The sensitivity is defined as the minimum
amplitude of the 2kHz- modulation, generated by the
transponder, demodulated and decoded by the reader.
This parameter depends on the application:
• the value of VDD
• the antenna
• the code sent to the reader
Note 2: The antenna amplitude voltage is:
Vant = VDD – VMODU + Vos
Note 3: The supply current of the device depends on the
antenna drive current IDD,ant:
Typically: IDD ≈ 1.3 mA + IDD,ant / 6.3
Note 4: The antenna supply current (called IDD,ant) is the
equivalent DC supply current driven by the chip through
the antenna.
3901090109
Rev 011
Page 5 of 16
Data Sheet
Jun/12
5 Page 
MLX90109
125kHz RFID Transceiver
VDD
C1
SPEED
VDD
Microcontroller
CD=100nF
L, C
18
2 7 DATA
3 6 CLOCK
4 5 MODE
9.3 Power consumption
If the power consumption is not critical and the reader does not have to be put in power down, the MODU
voltage can be strapped to the required level (between 0.8V and Vpd). However, the power consumption can
be reduced by controlling the voltage on VMODU pin (e.g. with an IO port of a microcontroller).
9.4 Noise cancellation
The read performance of a reader is linked with its robustness versus noise. The IC design has been
optimized to get a high signal-to-noise ratio (SNR). The resonant antenna is a natural band-pass filter, which
becomes more effective as its quality factor Qr increases.
Noise rejection could also be improved by a careful PCB design, and by adding decoupling capacitor(s) on
the supply lines. The most sensitive pins to noise injection are MODU and VDD. Since they directly determine
Vant, the noise could be considered as an amplitude modulation (AM) data from a transponder.
If the noise on both pins were identical, it would cancel out, giving a very noise-insensitive reader. Adding a
capacitor C1 between MODU and VDD, together with R1 and R2 yields a high pass filter with a cut-off
frequency at:
1
Fcut −off = 2 ⋅ π ⋅ (R1 // R2 ) ⋅ C1
Typically, such a filter should short all noise in the data spectrum, but for many cases, it might be beneficial to
set it to less than the net frequencies (50Hz, 60Hz). For example: R1=100kΩ, R2=19kΩ (to set VMODU), and
C1=220nF gives a cut off frequency of 45Hz.
9.5 Integrated decoding
The MLX90109 provides the option to have a decoded output. This significantly reduces the complexity of the
microcontroller software.
The data is available when the output clock signal is high. The clock signal has a 50% duty cycle when the
data is valid. When the noise level is stronger than the signal level, for instance when no tag is present in the
reader field, the duty cycle will be random. The microcontroller can use this feature to detect the presence of
3901090109
Rev 011
Page 11 of 16
Data Sheet
Jun/12
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MLX90109.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MLX90109 | 125kHz RFID Transceiver | Melexie |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |