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Texas Instruments TRF5901PTR
- Part No.:
- TRF5901PTR
- Manufacturer:
- Texas Instruments
- Category:
- RF Transceiver ICs
- Package:
- 48-LQFP
- Datasheet:
-
TRF5901PTR.pdf
- Description:
- IC RF TXRX ISM<1GHZ 48LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TRF5901PTR from Texas Instruments is a single-chip 915-MHz ISM band RF transceiver supporting FM/FSK modulation, featuring a 24-bit direct digital synthesizer (DDS) with 11-bit DAC, on-chip VCO and PLL, integrated LNA and power amplifier, and 48-pin PQFP packaging. It delivers typical output power of 4.5 dBm, 230 Hz frequency resolution, and operates from 3 V to 3.6 V for low-power wireless sensor and telemetry links.
For engineers reviewing the TRF5901PTR datasheet, TRF5901PTR pinout, TRF5901PTR application, or TRF5901PTR equivalent, this page provides verified technical context, validated pin functions, confirmed RF performance parameters (902–928 MHz operation, RSSI response <5 µs, 200 µs RX/TX turnaround), and real-world alternative selection guidance for narrow-band FSK systems interfacing with MSP430 microcontrollers.
Technical Context
The TRF5901PTR implements a single-conversion FSK receiver architecture with integrated LNA, mixer, dual-stage IF amplification (first IF gain 7 dB, second IF gain ~80 dB), quadrature demodulator using external LC tank, and adaptive data slicer with learning-mode AFC. Its transmitter integrates DDS-based frequency synthesis, programmable PA attenuation (0/10/20 dB), and open-collector PA_OUT driving 50-Ω loads.
It supports two fully programmable operational modes (Mode0/Mode1) for rapid frequency switching between preconfigured TX/RX settings without serial reprogramming, and features flexible baseband interface via 3-wire SPI-compatible control (DATA/CLOCK/STROBE) plus asynchronous TX_DATA and DATA_OUT signals - all optimized for TI MSP430 ultralow-power MCU integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Band | 902–928 MHz ISM band - enables license-free operation in North America for SRD applications. |
| Modulation Support | FM and FSK - no external modulator required; frequency deviation set via 8-bit register in DDS. |
| Output Power | Typical 4.5 dBm at 0-dB PA attenuation - sufficient for short-range (<100 m) telemetry without external PA. |
| Frequency Resolution | 230 Hz typical - enables narrow-channel spacing for high spectral efficiency in multi-channel systems. |
| Supply Voltage | 3.0–3.6 V - compatible with standard lithium coin-cell or 3.3-V logic rails, minimizing external regulation. |
| RSSI Response Time | 1–5 µs step response - supports OOK/ASK demodulation up to 100 kbps without external circuitry. |
| Serial Interface Speed | Up to 20 MHz CLOCK - allows fast register configuration during mode transitions or channel hopping. |
| Power Consumption (RX) | Typical 35 mA active - balances sensitivity and battery life in intermittent-receive sensor nodes. |
Pinout & Package
TRF5901PTR is housed in a 48-pin Low-Profile Plastic Quad Flat Package (PQFP), measuring 10 mm × 10 mm × 1.4 mm, with 0.5-mm lead pitch and exposed thermal pad (not electrically connected). Pin numbering follows standard TQFP top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PA_OUT (Pin 5) | Power amplifier output | Open-collector RF output; requires external 50-Ω matching network and DC blocking before antenna. |
| LNA_IN (Pin 2) | Low-noise amplifier input | RF input port with 50-Ω matched impedance; connects directly to antenna or front-end filter. |
| DATA_OUT (Pin 28) | Digital baseband output | CMOS-compatible logic-level FSK/OOK data output; drives MSP430 GPIO or UART RX directly. |
| TX_DATA (Pin 19) | Transmit modulation input | Asynchronous digital input for FSK/FM carrier modulation; active-high, synchronized internally to DDS clock. |
| MODE (Pin 17) | Operational mode select | Hardware-selectable toggle between Mode0 and Mode1 register sets - enables zero-latency frequency switching. |
| STDBY (Pin 16) | Standby control | Active-low enable; reduces current to 0.5–5 µA while preserving register contents for fast wake-up. |
| LOCKDET (Pin 11) | PLL lock indicator | Active-high open-drain signal confirming stable VCO/DDS lock - used for timing-critical TX/RX handshaking. |
| RSSI_OUT (Pin 33) | Analog receive strength output | 0.44–2.6 V analog voltage proportional to limiter input level (–80 to –10 dBm); slope 19 mV/dB. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DDS + VCO + PLL | Enables 230-Hz frequency resolution and ultrafast lock times (<30 µs hop time) without external synthesizer ICs. |
| Two programmable operation modes | Allows hardware-switched transition between preloaded TX/RX frequencies and configurations - eliminates serial bus latency. |
| Learning-mode AFC with S&H_CAP | Automatically calibrates external LC demodulator tank during 0-1 sequence; eliminates manual tuning and component tolerance drift. |
| Flexible baseband interface | Supports both synchronous SPI-like control (DATA/CLOCK/STROBE) and asynchronous TX_DATA/DATA_OUT - simplifies MSP430 firmware design. |
| Ultrafast RSSI response | 1–5 µs rise/fall time enables use as standalone OOK/ASK demodulator at up to 100 kbps - no external comparator needed. |
| Minimal external components | Requires only crystal, LC tank, matching networks, and decoupling caps - reduces BOM count and PCB area vs discrete RF solutions. |
Applications
| Wireless Sensor Networks | Industrial Remote Monitoring |
|---|---|
|
Use Scenario: Battery-powered temperature/humidity sensors transmitting periodic readings over 915-MHz ISM band in factory environments. IC Role / Device Role / Timing Role: TRF5901PTR serves as full-duplex-capable transceiver handling both sensor data transmission and potential command reception, with standby current <5 µA enabling multi-year battery life. Use Value: Integrated RSSI and learning-mode AFC maintain reliable link budget despite antenna detuning or environmental drift, reducing field calibration needs. |
Use Scenario: Wireless pressure and flow meters in oil/gas pipeline monitoring, operating in harsh EMI environments with limited maintenance access. IC Role / Device Role / Timing Role: TRF5901PTR acts as robust FSK transceiver with 80-dB IF gain and 4.5-dBm output, enabling >500-m range through metallic enclosures using simple wire antennas. Use Value: Dual-mode operation (Mode0/Mode1) allows seamless fallback to alternate frequency channels during interference events - no firmware update required. |
| Home Automation Systems | Asset Tracking Beacons |
|
Use Scenario: Zigbee-adjacent sub-GHz lighting and HVAC controllers communicating with central hub using proprietary FSK protocol. IC Role / Device Role / Timing Role: TRF5901PTR provides FM/FSK modulation capability and 3.3-V compatibility, interfacing directly with MSP430-based controller MCU without level-shifting. Use Value: 24-bit DDS ensures precise channel placement across 26-MHz bandwidth, avoiding adjacent-channel interference in dense residential RF environments. |
Use Scenario: GPS-denied indoor asset tags broadcasting location ID via periodic FSK bursts in warehouse logistics systems. IC Role / Device Role / Timing Role: TRF5901PTR functions as low-duty-cycle transceiver with 600-µs standby-to-transmit wake-up, minimizing average current draw per beacon. Use Value: On-chip LNA noise figure (4–5.8 dB) and RSSI-based carrier-sense support adaptive listen-before-talk, reducing packet collisions in multi-tag deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FSK transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CC1101RGPR | Higher max data rate (600 kbps vs 100 kbps), integrated packet handler, lower RX current (14 mA vs 35 mA), but no learning-mode AFC or RSSI-as-demodulator capability. | Better suited for high-throughput, packetized protocols (e.g., proprietary MAC layers); less optimal for analog OOK or tolerance-sensitive LC demodulation. | Select CC1101RGPR when system requires embedded CRC, preamble detection, or automatic whitening - not when analog RSSI or self-calibrating demodulation is critical. |
| SI4432-B1B-FMR | Wider frequency range (240–930 MHz), higher output power (+20 dBm with external PA), integrated crystal oscillator, but lacks dedicated learning-mode AFC and has slower RSSI response (>10 µs). | Preferred for global ISM band support and longer-range links; unsuitable where sub-5-µs RSSI response is needed for OOK demodulation. | Choose SI4432-B1B-FMR for multi-region deployments or when external PA integration is mandatory; avoid if TRF5901PTR's learning-mode AFC or ultrafast RSSI is leveraged in design. |
Compared with CC1101RGPR and SI4432-B1B-FMR, the TRF5901PTR offers unique analog-centric features - including learning-mode AFC for LC tank calibration and µs-scale RSSI-as-demodulator operation - making it irreplaceable in cost-sensitive, tolerance-robust FSK systems where digital packet engines add unnecessary complexity.
Availability
TRF5901PTR is available at Aetrix Electronics and suitable for wireless sensor networks, industrial telemetry, home automation gateways, and asset tracking beacons requiring stable component supply and long-term obsolescence management.
Supply support for TRF5901PTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of RF IC design heritage and broad industrial qualification.
The TRF5901PTR belongs to TI's legacy sub-GHz RF transceiver product line, engineered specifically for low-cost, low-power, narrow-band FSK systems targeting battery-operated telemetry and sensor applications in the 915-MHz ISM band.
FAQ
What is the primary RF band supported by the TRF5901PTR?
The TRF5901PTR operates in the 902–928 MHz ISM band, with nominal center frequency at 915 MHz. This band is license-free in North America and supports narrow-band FSK communication for telemetry, sensor networks, and remote control applications. The device achieves this using its integrated DDS, VCO, and PLL - all calibrated for stable operation across the full 26-MHz span.
Does the TRF5901PTR require external RF matching components?
Yes, the TRF5901PTR requires external matching networks: a 50-Ω matching circuit at LNA_IN for antenna interface, an LC tank at DEM_TANK pins (34/35) for quadrature demodulation, and a 50-Ω network at PA_OUT (Pin 5) for RF output. The datasheet provides reference schematics and impedance plots (S11/S22) to guide layout - no internal matching is provided for these RF paths.
How does the learning-mode AFC function in the TRF5901PTR?
The TRF5901PTR's learning-mode AFC uses the S&H_CAP pin (29) to charge an external capacitor during a 0-1-0-1 training sequence. This establishes a DC reference voltage proportional to the demodulator's average output, which becomes the data slicer threshold. The internal variable inductor then fine-tunes the external LC tank resonance - compensating for ±5% component tolerances without manual adjustment.
Can the TRF5901PTR interface directly with the MSP430 microcontroller?
Yes, the TRF5901PTR is explicitly designed for seamless interface with TI MSP430 MCUs. Its 3-wire serial control (DATA/CLOCK/STROBE), asynchronous TX_DATA and DATA_OUT signals, and 3.0–3.6-V supply compatibility eliminate level shifters or glue logic. Figure 1 in the SWRS014 datasheet shows a complete reference connection diagram between TRF5901PTR and MSP430 family devices.
What is the significance of the MODE pin on the TRF5901PTR?
The MODE pin (Pin 17) selects between two fully programmable operational states - Mode0 and Mode1 - each storing independent register configurations for frequency, gain, PA settings, and functional block enables. This allows hardware-triggered, zero-software-latency switching between preconfigured TX/RX profiles, such as hopping between two frequency channels or toggling between sensor read and command-response modes.
TRF5901PTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Programmable:
- Not Verified
- Type:
- TxRx Only
- RF Family/Standard:
- General ISM < 1GHz
- Protocol:
- -
- Modulation:
- ASK, FSK, OOK
- Frequency:
- 902MHz ~ 928MHz
- Data Rate (Max):
- 100kbps
- Power - Output:
- 4.5dBm
- Sensitivity:
- -
- Memory Size:
- -
- Serial Interfaces:
- SPI
- GPIO:
- -
- Voltage - Supply:
- 3V ~ 3.6V
- Current - Receiving:
- 28mA
- Current - Transmitting:
- 21mA ~ 37mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-LQFP (7x7)
TRF5901PTR FAQ
1.How can I place an order for TRF5901PTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TRF5901PTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TRF5901PTR reliable?
The price and inventory of TRF5901PTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TRF5901PTR is usually 5 days.
3.What payment methods are accepted for TRF5901PTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TRF5901PTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TRF5901PTR?
TRF5901PTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TRF5901PTR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TRF5901PTR?
For technical support, including TRF5901PTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TRF5901PTR requirements.
6.How does Aetrix verify that TRF5901PTR is sourced from the original manufacturer or authorized distributors?
All TRF5901PTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TRF5901PTR meets industry standards.
7.What is the process for return or replacement of TRF5901PTR?
All TRF5901PTR units undergo pre-shipment inspection (PSI). If there is an issue with TRF5901PTR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TRF5901PTR part is unused and in its original packaging.
Return procedure for TRF5901PTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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