User's Manual

TI PROPRIETARY T E X A S I N S T R U M E N T S
INFORMATION -
Revision:
INTERNAL DATA R F I D SYSTEMS 0
S P E C I F I C A T I O N
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4. TRF79x0ATB Module(s) Description
The TRF79x0ATB Evaluation Modules are intended to allow the software application
developer to get familiar with the functionalities of either of the TRF79x0A Multi-
Standard Fully Integrated 13.56 MHz NFC/RFID reader ICs with the freedom to
develop on their Texas Instruments Embedded microcontroller development platform
of choice.
The TRF79x0ATB module is also intended to allow customer driven antenna tuning
with onboard coil and customer driven antenna form factor design.
The module is hard wired for SPI communications, supports Slave Select and
TRF79x0A Direct Mode 2 (default), Direct Mode 1 and Direct Mode 0 operations.
The user also has access to and full control over the TRF79x0A EN2 and EN lines,
allowing for design and development of ultra low power NFC/HF RFID systems.
The module has an onboard boost converter (TPS61222DCKT) which boosts
+3.3VDC in to +5VDC out to TRF79x0A IC for +23dBm (full transmitter power out)
operations.
An impedance matching circuit from 4Ω to 50Ω is populated on the module and this
is connected to a tuned 50Ω antenna circuit which consists of onboard four turn coil
with series and parallel passive elements (capacitors and a resistor).
Test points are available on the board for checking firmware operations with
oscilloscope or logic analyzer, impedance matching and for attaching external antenna.
Connection to Texas Instruments Microcontroller platforms are made via Samtec EM
headers located on the underside of the board (Connectors P1/RF1 and P2/RF2).