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Texas Instruments RI-TMS3705ADR
- Part No.:
- RI-TMS3705ADR
- Manufacturer:
- Texas Instruments
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
RI-TMS3705ADR.pdf
- Description:
- IC RFID READER 134.2KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,666
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Product details
Overview
RI-TMS3705ADR from Texas Instruments is a low-frequency (134.2 kHz) RFID base station IC with integrated FSK demodulator, full-bridge antenna driver, and PLL-based transponder frequency adaptation. It operates from 4.5–5.5 V, consumes 15 µA in sleep mode, and supports TI-RFid™ LF transponders in hand scanners and vehicle immobilizers.
For engineers reviewing the RI-TMS3705ADR datasheet, RI-TMS3705ADR pinout, RI-TMS3705ADR application, or RI-TMS3705ADR equivalent, key selection factors include its 15625-baud two-wire serial interface, built-in band-pass filter and limiter, short-circuit protection, and compatibility with 400–700 µH antenna inductance.
Technical Context
The RI-TMS3705ADR implements a PLL-based automatic frequency measurement and adaptation loop to maintain lock with TI-RFid™ transponders operating at 134.2 kHz. Its digital FSK demodulator processes backscattered response signals while rejecting out-of-band interference via an integrated band-pass filter and limiter.
It uses a full-bridge antenna driver capable of driving resonant LC tanks without external H-bridge components, and features a multifunctional two-wire serial interface for microcontroller control at 15625 baud - enabling configuration, diagnostics, and real-time status reporting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 134.2 kHz FSK - precisely matches TI-RFid™ LF transponder carrier for reliable communication |
| Supply Voltage | 4.5–5.5 V DC - compatible with standard 5 V logic and power rails |
| Sleep Current | 15 µA typical - enables battery-powered handheld readers with multi-year standby life |
| Antenna Inductance | 400–700 µH - defines practical range for external resonant tank design |
| Data Interface | Two-wire serial, 15625 baud - minimizes MCU GPIO usage and simplifies firmware integration |
| ESD Protection | ±2000 V HBM - meets industrial handling requirements without additional protection circuitry |
| Operating Temp | –40°C to +85°C - supports automotive immobilizer and outdoor reader deployments |
Pinout & Package
RI-TMS3705ADR is housed in a 16-pin SOIC package (10 mm × 6 mm), RoHS-compliant with green (Pb-free, no Sb/Br) finish and JEDEC MSL Level-3 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Connects to 4.5–5.5 V regulated supply; bypass capacitor required near pin |
| GND | Ground reference | Common return for analog/digital sections; separate ground plane recommended |
| ANT1 / ANT2 | Full-bridge antenna outputs | Drive complementary square waves across resonant LC tank; support bidirectional energy transfer |
| SDA / SCL | Two-wire serial interface | Bi-directional data and clock lines; require pull-up resistors to VDD |
| RESET | Active-low reset input | Hardware-initiated initialization; internal power-on reset also provided |
| DIAG | Diagnostics output | Open-drain signal indicating internal fault conditions (e.g., overtemperature, short circuit) |
| FSKOUT | Demodulated FSK data output | Provides raw digital FSK bitstream post-limiter and filtering; optional for MCU decoding |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PLL frequency adaptation | Automatically tracks and locks to transponder carrier drift without MCU intervention |
| Built-in band-pass filter & limiter | Rejects ambient RF noise and amplifies weak transponder responses before FSK demodulation |
| Full-bridge antenna driver | Eliminates need for external H-bridge MOSFETs and gate drivers in 134.2 kHz reader designs |
| Short-circuit protection | Shuts down driver outputs on antenna short detection, preventing thermal damage |
| Low-power sleep mode | Reduces system quiescent current to 15 µA, enabling energy harvesting or coin-cell operation |
Applications
| Handheld RFID Scanner | Vehicle Immobilizer System |
|---|---|
Use Scenario: Portable access control reader used by security personnel to verify credentials at entry points. IC Role / Device Role / Timing Role: Base station IC generating 134.2 kHz carrier and demodulating transponder ID response. Use Value: Sleep current of 15 µA extends battery life between charges; integrated FSK demodulator reduces external component count by 4+ discrete ICs. | Use Scenario: Embedded reader in car door handle or ignition coil verifying transponder key authenticity before engine start. IC Role / Device Role / Timing Role: Antenna driver and demodulator for ISO 11784/11785-compliant LF transponder interrogation. Use Value: Full-bridge driver delivers sufficient field strength through metal housing; short-circuit protection ensures reliability during repeated key insertion/removal. |
| Stationary Asset Tracker | Industrial Tool Authentication |
Use Scenario: Fixed-mount reader at warehouse dock doors logging tagged pallets entering/exiting. IC Role / Device Role / Timing Role: Continuous-operation LF base station interfacing with microcontroller via two-wire serial bus. Use Value: 15625-baud interface enables deterministic command-response timing; built-in diagnostics flag antenna faults before read failures occur. | Use Scenario: Power tool with embedded transponder verifying operator credential and tool calibration status. IC Role / Device Role / Timing Role: Reader subsystem providing secure, low-power authentication handshake prior to motor activation. Use Value: Integrated limiter and band-pass filter ensure robust operation in electrically noisy workshop environments; RoHS/green packaging meets industrial compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LF RFID base station applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RI-TMS3705ADRG4 | Same die, green (RoHS & no Sb/Br) finish, identical electrical specs and pinout | No functional difference; differs only in eco-plan and packaging (tape/reel vs. tube) | Select for RoHS-compliant production requiring bromine/antimony-free materials |
| RI-TMS3705AD | Same functionality, but packaged in PDIP-16; higher thermal resistance and larger footprint | Preferred for prototyping or low-volume manual assembly where SOIC reflow is impractical | Select when board-level rework or hand-soldering is required, or for legacy DIP-compatible layouts |
Compared with RI-TMS3705ADR, the RGRG4 variant offers identical performance with enhanced environmental compliance, while the PDIP version trades miniaturization for assembly flexibility - both retain full 134.2 kHz FSK base station capability and diagnostic features.
Availability
RI-TMS3705ADR is available at Aetrix Electronics and suitable for handheld RFID scanners, vehicle immobilizers, and stationary asset tracking systems requiring stable component supply and long-term industrial availability.
Supply support for RI-TMS3705ADR 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 company headquartered in Dallas, Texas, delivering analog, embedded processing, and connectivity solutions since 1930.
The RI-TMS3705ADR belongs to TI's RFID product line, designed specifically for low-frequency (134.2 kHz) contactless identification systems compliant with ISO 11784/11785 and optimized for minimal external component count in reader hardware.
FAQ
What is the primary function of the RI-TMS3705ADR in an RFID system?
The RI-TMS3705ADR serves as a complete LF base station IC that generates the 134.2 kHz carrier signal, drives the antenna via its integrated full-bridge driver, and demodulates the FSK-modulated response from TI-RFid™ transponders. It handles all physical-layer functions - including PLL-based frequency adaptation, limiting, filtering, and diagnostics - reducing the need for external signal conditioning components in the reader design. The RI-TMS3705ADR is central to reliable, low-power LF RFID interrogation.
Does the RI-TMS3705ADR support automatic frequency adjustment for transponder drift?
Yes, the RI-TMS3705ADR includes an integrated PLL that performs automatic transponder frequency measurement and adaptation. This allows it to maintain lock with TI-RFid™ transponders even if their resonant frequency shifts due to temperature or aging. The adaptation occurs in real time without MCU involvement, ensuring consistent read range and reliability across varying environmental conditions. This feature is explicitly confirmed in the official TI datasheet SCBS863.
What antenna inductance range is recommended for use with the RI-TMS3705ADR?
The RI-TMS3705ADR is optimized for antenna inductance values between 400 µH and 700 µH, as specified in the TI datasheet. This range ensures proper resonance at 134.2 kHz when paired with the recommended tuning capacitance, maximizing magnetic field strength and coupling efficiency. Using inductance outside this range may degrade read range or cause instability in the oscillator loop. Designers should verify resonance with an impedance analyzer and adjust capacitance accordingly.
How does the RI-TMS3705ADR manage power consumption in portable applications?
The RI-TMS3705ADR achieves ultra-low power operation with a typical sleep current of 15 µA, enabling multi-year battery life in handheld scanners and key fobs. It supports rapid wake-up from sleep mode upon MCU command, and its internal power-on reset ensures reliable initialization without external circuitry. The device draws only 8 mA (typical) during active charge phase - significantly lower than discrete implementations - making it ideal for energy-constrained LF RFID reader designs.
Is the RI-TMS3705ADR pin-compatible with other TMS3705 variants?
Yes, the RI-TMS3705ADR is pin-compatible with RI-TMS3705ADRG4 and RI-TMS3705AD, sharing identical pin assignments and electrical behavior across all three variants. Differences are limited to package type (SOIC vs. PDIP), eco-plan (green vs. standard), and packaging format (reel vs. tube). No PCB layout changes are required when substituting between these variants, though thermal and mechanical considerations differ between SOIC and PDIP packages.
RI-TMS3705ADR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- RI-TMS3705
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- RFID Reader
- Frequency:
- 134.2kHz
- Standards:
- -
- Interface:
- SPI
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
RI-TMS3705ADR FAQ
1.How can I place an order for RI-TMS3705ADR through Aetrix?
Please submit a Request for Quotation (RFQ) for RI-TMS3705ADR 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 RI-TMS3705ADR reliable?
The price and inventory of RI-TMS3705ADR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RI-TMS3705ADR is usually 5 days.
3.What payment methods are accepted for RI-TMS3705ADR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RI-TMS3705ADR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RI-TMS3705ADR?
RI-TMS3705ADR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RI-TMS3705ADR 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 RI-TMS3705ADR?
For technical support, including RI-TMS3705ADR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RI-TMS3705ADR requirements.
6.How does Aetrix verify that RI-TMS3705ADR is sourced from the original manufacturer or authorized distributors?
All RI-TMS3705ADR 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 RI-TMS3705ADR meets industry standards.
7.What is the process for return or replacement of RI-TMS3705ADR?
All RI-TMS3705ADR units undergo pre-shipment inspection (PSI). If there is an issue with RI-TMS3705ADR, 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 RI-TMS3705ADR part is unused and in its original packaging.
Return procedure for RI-TMS3705ADR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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