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PDF TXC101 Data sheet ( Hoja de datos )
| Número de pieza | TXC101 | |
| Descripción | Multi-channel High data rate Programmable | |
| Fabricantes | RFM | |
| Logotipo |  |
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Complies with Directive 2002/95/EC (RoHS)
Product Overview
TXC101 is a highly integrated single chip, multi-channel, low power, high
data rate RF transmitter designed to operate in the unlicensed 315/433/868
and 915 MHz frequency bands. All critical RF and baseband functions are
completely integrated in the chip, thus minimizing external component
count and simplifying design-ins. Its small size with low power
consumption makes it ideal for various short range radio applications.
The TXC101 is a dual mode solution. In the Micro controller mode, a
generic 10MHz crystal and a low-cost microcontroller are the only
requirements to create a complete Transmitter link.
In the EEPROM mode, the TXC101 can function as a complete data
transmitter with any SPI compatible EEPROM and does not need a micro
controller. This makes it an ideal solution for a variety of simple short
range radio applications.
Key Features
• Modulation: OOK/FSK
• Frequency Hopping Spread Spectrum capability
• Operating frequency: 315/433/868/915 MHz
• Low current consumption (TX current ~ 10mA)
• Wide Operating supply voltage: 2.2 to 5.4V
• Low standby current (0.2uA)
• OOK Data rate up to 512kbps
• FSK Data rate up to 256kbps
• Support for Multiple Channels
• [315/433 Bands]: 380 Channels (25kHz)
• [868 Band]: 761 Channels (25kHz)
• [915 Band]: 1040 Channels (25kHz)
• Generic 10MHz Xtal reference
• Processor or EEPROM Mode Operation
• Integrated PLL, IF & Baseband Circuitry
• Programmable Push Button Control
• Programmable Output RF Power
• Programmable, Positive/Negative FSK Deviation
• Programmable Clock Output Frequency
• Standard SPI interface
• Integrated, Programmable Low Battery Voltage Detector
• External Wake-up Events
• TTL/CMOS Compatible I/O pins
• Automatic Antenna tuning circuit
• Very few external components requirement
• No Manual Adjustment Needed for Production
• Small size plastic package: 16-pin TSSOP
• Standard 13 inch reel, 2000 pieces.
16-TSSOP package
Popular applications
• Remote control applications
• Active RFID tags
• Wireless PC Peripherals
• Automated Meter reading
• Home & Industrial Automation
• Security systems
• 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
rev01
(800) 704-6079 toll-free in U.S. and Canada
www.rfm.com Email: [email protected]
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2.0 Functional Description
The TXC101 is a low power, frequency agile, multi-channel OOK/FSK transmitter for use in the 315, 433,
868, and 916 MHz bands. All RF transmit functions are completely integrated requiring only a single
10MHz crystal as a reference source. The TXC101 has two modes of operation: EEPROM mode and
Processor mode. EEPROM mode is fully compatible with any standard SPI interface EEPROM.
Functions include:
• PLL synthesizer
• Power Amp
• Crystal oscillator
• Sleep Timer
• OOK/FSK Modulation
• 4 Key/Switch Functions
The TXC101 is ideal for Frequency Hopping Spread Spectrum (FHSS) applications requiring frequency
agility to meet FCC and ETSI requirements. Use of a low-cost microcontroller or SPI compatible
EEPROM is all that is needed to create a complete transmitter. The TXC101 also incorporates different
sleep modes to reduce overall current consumption and extend transmitter battery life. It is ideal for
applications operating from typical lithium coin cells.
2.1 TXC101 Processor Mode and Application Circuit
Figure 1. Typical Processor Mode Application Circuit for 50 Ohm Load
The TXC101 may be used with a typical low-cost microcontroller. All internal functions are accessible
through the SPI interface. Figure 1 shows a typical connection for using a microcontroller to control the
TXC101 functions.
RF Transmitter Matching
The RF pins are high impedance and differential. The optimum differential load for the RF port at a given
frequency band is shown in Table 1.
TABLE 1.
315 MHz
433 MHz
868 MHz
916 MHz
Admittance [S]
9.4e-4 – j4.5e-3
8.4e-4 – j6.25e-3
1.15e-3 – j1.2e-2
1.2e-3 – j1.25e-2
Impedance [Ohm]
43 + j214
21 + j157
7.9 + j83
7.6 + j79
Lantenna (nH)
112
59
15.3
13.9
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3.0 TXC101 Functional Characteristics
RF_P
RF_N
PA
VCO
PLL
/N
OSC
BATT DET
CONTROL
LOGIC
Wake-up
SDI
SCK
nCS
nIRQ/nBD
SW1
SW2
SW3
SW4
MODE
CLKOUT/SDO
XTAL/REF
VDD GND
Figure 3. Functional Block Diagram
MOD
Output Power Amplifier
The power amplifier is an open-collector, differential output with programmable output power which can
directly drive a loop or dipole antenna, and with proper matching may also drive a monopole antenna.
Incorporated in the power amplifier is an automatic antenna tuning circuit to avoid manual tuning during
production and to offset “hand effects”. Registers common to the Power Amplifier are:
• Power Management Register
• Transmit Power Configuration Register
Phase Lock Loop (PLL)
The PLL synthesizer is the heart of the operating frequency. It is programmable and completely
integrated, providing all functions required to generate the carriers and tunability for each band. The PLL
requires only a single 10MHz crystal reference source. RF stability is controlled by choosing a crystal
with the particular specifications to satisfy the application.
The PLL is able to perform manual and automatic calibration to compensate for changes in temperature
or operating voltage. When changing band frequencies, re-calibration must be performed. This can be
done by disabling the synthesizer and re-enabling again through the Power Management Register.
Registers common to the PLL are:
• Power Management Register
• Configuration Register
• Frequency Setting Register
• Automatic Frequency Adjust Register
• Transmit Configuration Register
Transmit Register
The transmit register is configured as two 8-bit shift registers connected in series to form a single 16-bit
shift register. On POR the registers are filled with the value AAh. This can be used to generate a
preamble before sending actual data. When the transmitter is enabled through the Power Management
Register, transmission begins immediately and the value in the transmit register begins to be sent out. If
there is nothing written to the register, it will send out the default value of AAh. The next data byte can be
loaded via the SPI bus to the Transmit Register by monitoring the SDO pin for a logic ‘1’ or waiting for an
active low interrupt output from the nIRQ pin. After data has been loaded to the Transmit Register, the
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TXC101.PDF ] | |
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