MLX90109EDC Melexis Inc, MLX90109EDC Datasheet - Page 6

• Manufacturer Part Number: MLX90109EDC
• Description: IC RFID TXRX 125KHZ 8-SOIC
• Manufacturer: Melexis Inc
• Series: MLX90109r

Specifications of MLX90109EDC

• Rf Type: Read / Write
• Frequency: 125kHz
• Features: Low Power Consumption
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MLX90109EDCTR

The MODE pin allows to define whether the MLX90109 will issue directly the filtered data stream on the
DATA pin (MODE floating), or decode it in Manchester (MODE = V
two decoding modes, the MLX90109 issues the tag data on the DATA pin at the rising edge of the clock,
which is issued on the CLOCK pin. Both CLOCK and DATA are open drain outputs and require external pull-
up resistors.
(*) Internally strapped to V
The MLX90109 is a reader IC working in a frequency range of 100 to 150kHz, and designed for use with a
parallel L-C antenna. This concept requires significantly less current than traditional serial antennas, for
building up the same magnetic field strength.
The voltage on the MODU pin (V
(1)
with V
Note: In order to use the internal driver FET as an ideal current source, the voltage on the coil pin should
remain higher than its saturation voltage (typically 0.5V) for a driver current (I
can be as much as 300mV, V
By setting V
will fade to 0V. The MLX90109 powers up by pulling V
A sequence of power up / power down periods sets the antenna voltage ON and OFF. This feature allows to
simply make an ON/OFF-keying modulated signal to the transponder.
Typically, V
antenna (Q
Refer to the section “Typical operating configurations” further in this document for more detailed information
and practical hints.
3901090109
Rev 008
7.4 Digital demodulator
7.5 Antenna voltage definition
7.6 Power Down mode
7.7 Write operation
SPEED
MODE
OS
, the offset relative to the V
V
ant
MODU
MODU
ant
) and its start-up takes about 3 carrier periods.
is toggled between VDD and 0.8V. Antenna fade-out is related to the quality factor of the
higher than V
V
DD
Biphase
4kBaud
V
V
MODU
SS
DD
/2
MODU
pd
MODU
(preferably to V
V
should be higher than 0.8V for a correct operation.
OS
MODU
) controls the amplitude of the antenna voltage V
No decoding
FLOAT (*)
level.
-
Page 6 of 15
DD
) the MLX90109 goes in power down. The antenna voltage
MODU
Manchester
2kBaud
below V
V
DD
pu
SS
.
) or Biphase (MODE = V
125kHz RFID Transceiver
driver
) up to 14mA. As this offset
MLX90109
ant
, as follows:
Data Sheet
Jun/06
DD
). In these