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PDF TRC102 Data sheet ( Hoja de datos )
| Número de pieza | TRC102 | |
| Descripción | RF Transceiver | |
| Fabricantes | RF Monolithics | |
| Logotipo |  |
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Product Overview
TRC102 is a highly integrated single chip, zero-IF, multi-channel, low
power RF transceiver. It is an ideal fit for low cost, high volume, two way
short-range wireless applications for use in the unlicensed 400-1000 MHz
frequency bands. The TRC102 is FCC & ETSI certifiable and improves
upon the TRC101 with improved phase noise and is capable of higher
output power. All critical RF and baseband functions are completely
integrated in the chip, thus minimizing external component count and
simplifying and speeding design-ins. Use of a low cost, generic 10MHz
crystal and a low-cost microcontroller is all that is needed to create a
complete link. The TRC102 also incorporates different sleep modes to
reduce overall current consumption and extend battery life. Its small size
with low power consumption makes it ideal for various short range radio
applications.
Key Features
• Modulation: FSK (Frequency Hopping Spread Spectrum
capability)
• Frequency range: 400-1000 MHz
• High sensitivity: (-112 dBm)
• High data rate: Up to 256 kbps
• Low current consumption
(RX current ~11mA)
• Operating supply voltage: 2.2 to 3.8V
• Low standby current (0.3uA)
• Programmable Synch Byte
• Integrated PLL, IF, Baseband Circuitry
• Automatic Frequency Adjust(TX/RX frequency alignment)
• Programmable Analog/Digital Baseband Filter
• Programmable Output RF Power
• Programmable Input LNA Gain
• Internal Valid Data Recognition
• Transmit/Receive FIFO
• Standard SPI Interface
• TTL/CMOS Compatible I/O pins
• Programmable CLK Output Freq
• Automatic Antenna tuning circuit
• Low cost, generic 10MHz Xtal reference
• Integrated, Programmable Low Battery Voltage Detector
• Programmable Wake-up Timer with programmable Duty Cycle
• Integrated Selectable Analog/Digital RSSI
• Integrated Crystal Oscillator
• External Processor Interrupt pin
• Programmable Crystal Load Capacitance
• Programmable Data Rate
• Integrated Clock & Data Recovery
• Programmable FSK Deviation Polarity
• External Wake-up Events
16-TSSOP package
• Support for Multiple Channels
• [433 Bands] 95 Channels (100kHz)
• [868 Band] 190 Channels (100kHz)
• [915 Band] 285 Channels (100kHz)
• Power-saving sleep mode
• Very few external components requirement
• Small size plastic package: 16-pin TSSOP
• Standard 13 inch reel, 2000 pieces.
Popular applications
• Active RFID tags
• Automated Meter reading
• Home & Industrial Automation
• Security systems
• Two way Remote keyless entry
• Automobile Immobilizers
• Sports & Performance monitoring
• Wireless Toys
• Medical equipment
• Low power two way telemetry systems
• Wireless mesh sensors
• Wireless modules
RF Monolithics, Inc.
4441 Sigma Road
Dallas, Texas 75244 (800) 704-6079 toll-free in U.S. and Canada www.rfm.com
Email: [email protected]
Rev04
1
1 page  
These values are what the RF port pins want to “see” as an antenna load for maximum power transfer.
Antennas ideally suited for this would be a Dipole, Folded Dipole, and Loop. For all transmit antenna
applications a bias or “choke” inductor must be included since the RF outputs are open-collector type.
The TRC102 may also drive a single ended 50 Ohm load, such as a monopole antenna, using the
matching circuit as shown in Figure 1. Use of a balun would provide an optimum power transfer, but the
matching circuit of Figure 1 has been optimized for use with discrete components, reducing the cost
associated with use of a balun. The matching component values for a 50 Ohm load for each band are
given in Table 2.
Table 2.
Ref Des 433 868 916
C1 5.1pF 2.7pF 2.7pF
C2 2.7pF 1.2pF 1.2pF
C4 .1uF .1uF .1uF
C7 100pF 100pF 100pF
L1 36nH 8.7nH 8.7nH
L2 390nH 100nH 100nH
L3 47nH 22nH 22nH
Antenna Design Considerations
The TRC102 was designed to drive a differential output such as a Dipole antenna or a Loop. The loop
antenna is ideally suited for applications where compact size is required. The dipole is typically not an
attractive option for compact designs due to its inherent size at resonance and distance needed away
from a ground plane to be an efficient antenna. A monopole antenna can be used with the addition of a
balun or by using the matching circuit in Figure 1.
PCB Layout Considerations
Optimal PCB layout is very critical. For optimal transmit and receive performance, the trace lengths at the
RF pins must be kept as short as possible. Using small, surface mount components, like 0402 or 0603,
will yield the best performance as well as keep the RF port compact. Make all RF connections short and
direct. A good rule of thumb to adhere to is add 1nH of series inductance for every 0.1” of trace length.
The crystal oscillator is also affected by additional trace length as it adds parasitic capacitance to the
overall load of the crystal. To minimize this effect place the crystal as close as possible to the chip and
make all connections short and direct. This will minimize the effects of “frequency pulling” that stray
capacitance may introduce and allows the internal load capacitance of the chip to be more effective in
properly loading the crystal oscillator circuit.
If using an external processor, the TRC102 provides an on-chip clock for that purpose. Even though this
is an integrated function, long runs of the clock signal may radiate and cause interference. This can
degrade receiver performance as well as add harmonics or unwanted modulation to the transmitter.
Keep clock connections as short as possible and surround the clock trace with an adjacent ground plane
pour where needed. This will help in reducing any radiation or crosstalk due to long runs of the clock
signal.
Good power supply bypassing is also essential. Large decoupling capacitors should be placed at the
point where power is applied to the PCB. Smaller value decoupling capacitors should then be placed at
each power point of the chip as well as bias nodes for the RF port. Poor bypassing lends itself to
conducted interference which can cause noise and spurious signals to couple into the RF sections,
significantly reducing performance.
5
5 Page 
Low Battery Detector
The integrated low battery detector monitors the voltage supply against a preprogrammed value and
generates an interrupt when the supply voltage falls below the programmed value. The detector circuit
has 50mV of hysteresis built in.
SPI Interface
The TRC102 is equipped with a standard SPI bus that is compatible to almost all SPI devices. All
functions and status of the chip are accessible through the SPI bus. Typical SPI devices are configured
for byte write operations. The TRC102 uses word writes so the nCS pin(3) should be pulled low for 16
bits.
Figure 3. SPI Interface Timing
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TRC102.PDF ] | |
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