General; Rfm Block Schematic - Texas Instruments 2000 Series Reference Manual

General

1.1 General
CARE MUST BE TAKEN WHEN HANDLING THE RFM. HIGH
VOLTAGE ACROSS THE ANTENNA TERMINALS, ALL ANTENNA
COMPONENTS AND SOME PARTS OF THE PRINTED CIRCUIT
BOARD (PCB) COULD BE HARMFUL TO YOUR HEALTH. IF THE
ANTENNA INSULATION IS DAMAGED, THE ANTENNA SHOULD
NOT BE CONNECTED TO THE RFM.
This product may be subject to damage by electrostatic discharge (ESD). It
should be handled by ESD protected personnel at ESD secured workplaces
only. The transmitter power output stage can only operate with a limited duty
cycle. Please pay attention to this whilst performing antenna tuning procedures.
Ground pins GND and GNDP must be connected externally to avoid damage to
the unit.
The RFM is an integral part of the TI-RFid system. Coupled with a Control Module and an antenna, it is
used for wireless identification of TI-RFid transponders. A block schematic is shown in
TXCT-
RXDT
RXCK
6
ATI
Interface
RXSS-
The RFM contains all the analogue functions of a TI-RFid reading unit needed to send an energizing
signal via the antenna to initialize a TI-RFid transponder, to demodulate the received identification signal
and to send the received data together with clock signals to a Control Module.
The RFM also sends the necessary programming and addressing signals to Read/Write and Multipage
transponders.
8 Product Description
CPS
PWM
TX
Oscillator
RX
demodulator
Demodulator
ATI
Int
RXSS
threshold
Threshold
Figure 1-1. RFM Block Schematic
WARNING
CAUTION
PWM Control Input
Overvoltage Protection
TX Power
Stage
RX
Amplifier
www.ti.com
Figure 1-1.
Antenna
Circuit
TX/RX
Antenna
SCBU022 – November 2002
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