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TRF7960 Datasheet(PDF) 2 Page - Texas Instruments

Part No. TRF7960
Description  Multi-Standard Fully Integrated 13.56-MHz Radio Frequency Identification (RFID) Analog Front End and Data Framing Reader System
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TRF7960 Datasheet(HTML) 2 Page - Texas Instruments

   
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DESCRIPTION (CONTINUED)
Tx_Out
Rx1_AM
Rx2_PM
VDD_X
VDD_I/O
SYS_CLK
DATA_CLK
8 (Parallel)
3(SPI)
VDD
TRF7960
MSP430
Z-Matching
Circuit
Xtal
13.56MHz
IRQ
VDD_A
VDD_RF
VDD_PA
TX_OUT
VSS_PA
VSS_RX
RX_IN1
I/O_7
I/O_6
I/O_5
I/O_4
I/O_3
I/O_2
I/O_1
I/O_0
24
23
22
21
20
19
18
17
2
3
4
5
6
7
8
1
VIN
ThermalPad
TRF796x
RHB-32
TRF7960/61
SLOS504B – AUGUST 2006 – REVISED APRIL 2007
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Figure 1. Typical Application
A parallel or serial interface can be used for
The receiver system also includes a framing system.
communication between the MCU and reader. When
This system performs the CRC and/or parity check,
hardware
encoders
and
decoders
are
used
removes the EOF and SOF settings, and organizes
(accelerators for different standards), transmission
the data in bytes. Framed data is then accessible to
and receive functions use a 12-byte FIFO register.
the MCU via a 12-byte FIFO register and MCU
For
direct
transmit
or
receive
functions,
the
interface. The framing supports ISO14443 and
encoders/decoders can be bypassed in order for the
ISO15693 protocols.
MCU to process the data in real time. The transmitter
The
TRF7960/61
supports
data
communication
has selectable output-power levels of 100 mW (20
levels between 1.8 V–5.5 V for the MCU I/O interface
dBm) or 200 mW (23 dBm) into a 50-
Ω load (at 5 -V
while also providing a data synchronization clock. An
supply) and is capable of ASK or OOK modulation.
auxiliary 20-mA regulator (pin 32) is available for
Integrated voltage regulators ensure power-supply
additional system circuits.
noise rejection for the complete reader system.
Data transmission comprises low-level encoding for
ISO15693,
modified
Miller
for
ISO14443-A,
high-bit-rate systems, Tag-it, and HF-EPC system
coding. Included with the data encoding is automatic
generation of SOF, EOF, CRC, and/or parity bits.
The
receiver
system
enables
AM
and
PM
demodulation using a dual-input architecture. The
receiver also includes an automatic gain control
option and selectable gain. Also included is a
selectable bandwidth to cover a broad range of input
subcarrier
signal
options.
The
received
signal
strength for AM and PM modulation is accessible via
the RSSI register. The receiver output is selectable
between a digitized subcarrier signal and any of
eleven
integrated
subcarrier
decoders
(two
for
ISO15693 low bit rate, two for ISO15693 high bit
rate, two for ISO14443, three for ISO14443 high bit
rates, one for Tag-it, and one for HF-EPC system).
Selected decoders also deliver bit stream and a data
clock as outputs.
Figure 2. TRF796x Pin Assignments (Top View)
2
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