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Texas Instruments RI-STU-655A-00
- Part No.:
- RI-STU-655A-00
- Manufacturer:
- Texas Instruments
- Category:
- RFID Reader Modules
- Package:
- 300mm x 200mm x 160mm
- Datasheet:
-
RI-STU-655A-00.pdf
- Description:
- RFID READER R/W 13.56MHZ
- Quantity:
- Payment:
- Shipping:
Inventory:3,414
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Product details
Overview
RI-STU-655A-00 from Texas Instruments is a housed 13.56 MHz HF RFID reader system supporting ISO 15693 and Tag-it HF/I transponders, delivering adjustable transmitter power from 0.5W to 10W ±1dB, operating on dual-input AC (100–120V/60Hz or 220–240V/50Hz), and featuring RS232/RS485 interface with ISO Host Protocol for industrial access control and asset tracking.
For engineers reviewing the RI-STU-655A-00 datasheet, RI-STU-655A-00 pinout, RI-STU-655A-00 application, or RI-STU-655A-00 equivalent, key selection considerations include its dual-antenna ASK/FSK receive capability, software-adjustable AM modulation depth (10%–30% ±6% or 100%), opto-coupled I/O (2 in / 2 out), relay output (24V DC / 60W), and IP54-rated metal enclosure for factory-floor deployment.
Technical Context
The RI-STU-655A-00 implements a fixed-frequency 13.56 MHz ±7 kHz carrier with software-configurable AM modulation and dual-receive-channel demodulation (ASK at 423.75 kHz; FSK at 423.75/484.29 kHz), enabling simultaneous detection of multiple ISO 15693 tags in noisy industrial environments.
It integrates dedicated hardware for protocol synchronization via I/O, supports up to 254 device addresses via software, and uses internal EEPROM (1 kB), RAM (256 kB), and Flash (512 kB) to store configuration, buffered tag data, and field-upgradable firmware over its serial interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 13.56 MHz ±7 kHz - ensures strict compliance with ISO/IEC 15693 and EPCglobal HF standards. |
| Transmitter Power Range | 0.5W to 10W ±1 dB in 0.25W software steps - enables precise read-range tuning from ~10 cm to >1 m with Tag-it HF-I tags. |
| Receive Channels | ASK @ 423.75 kHz + FSK @ 423.75/484.29 kHz - supports both modulation schemes required for multi-vendor ISO 15693 tag interoperability. |
| Communication Interface | RS232 or RS485 (jumper-selectable) - RS485 allows daisy-chaining up to 32 readers on a single bus in factory automation systems. |
| Power Input | 100–120 V / 60 Hz or 220–240 V / 50 Hz (switch-selected) - eliminates need for external voltage converters in global deployments. |
| Environmental Rating | IP54 enclosure + -20°C to +55°C operating range - certified for indoor industrial use with dust and splash resistance. |
| Output Interfaces | 2 × opto-coupled outputs (24 V DC / 30 mA) + 1 relay (24 V DC / 60 W) - directly drives solenoids, status lights, or PLC inputs without external drivers. |
Pinout & Package
Packaged in a powder-coated sheet steel housing (300 mm × 200 mm × 160 mm, 5.5 kg) with look-up hinged lid and IP54 ingress protection. Antenna and I/O connectors are front/rear panel mounted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC IN L/N | Main AC power input | Accepts 100–120 V / 60 Hz or 220–240 V / 50 Hz via terminal block; internal switch selects voltage range. |
| TX/RX ANT | Primary antenna port | SMA female connector for 50 Ω transmit/receive antenna; delivers full 10W RF output when heat sink installed. |
| RX ONLY ANT | Secondary receive antenna port | SMA female connector for dedicated 50 Ω receive-only antenna; improves signal-to-noise ratio in multipath environments. |
| RS232/RS485 | Serial communication interface | DB9 male connector; jumper selects RS232 (point-to-point) or RS485 (multi-drop, up to 32 nodes). |
| DIGITAL IN 1/2 | Opto-isolated inputs | 24 V DC max, 20 mA; used for external trigger (e.g., photoelectric sensor) or mode selection. |
| DIGITAL OUT 1/2 | Opto-isolated outputs | 24 V DC / 30 mA sink/source; drive indicator LEDs or PLC inputs without level-shifting. |
| RELAY COM/NO/NC | Electromechanical relay | SPDT contacts rated 24 V DC / 60 W; controls door locks, alarms, or auxiliary equipment directly. |
| I/O SYNC | Protocol synchronization I/O | Opto-isolated signal for master-slave timing coordination across multiple RI-STU-655A-00 units. |
Key Features
| Feature | Design Value |
|---|---|
| Software-tunable AM modulation | Adjustable 10%–30% ±6% or 100% depth - optimizes tag interrogation reliability across varying coil coupling and material interference. |
| Dual-receive demodulation | Simultaneous ASK and FSK decoding at 423.75/484.29 kHz - ensures compatibility with legacy and newer ISO 15693 transponders in mixed-tag environments. |
| Field-upgradable firmware | Firmware stored in 512 kB Flash, updated via RS232/RS485 - enables security patches, protocol extensions, and feature enhancements without hardware replacement. |
| Configurable addressing | Up to 254 unique addresses via software (or 8 via DIP switch) - simplifies integration into large-scale RFID networks with centralized host control. |
| Industrial I/O suite | 2 opto-in, 2 opto-out, 1 relay, and sync I/O - eliminates need for external interface modules in access control, conveyor tracking, and tool management systems. |
Applications
| Access Control System | Asset Tracking Station |
|---|---|
Use Scenario: Secure entry point with badge validation and door lock actuation in office buildings or cleanrooms. IC Role / Device Role / Timing Role: RFID reader subsystem performing ISO 15693 tag interrogation, host protocol translation, and real-time relay-based door release. Use Value: IP54-rated enclosure withstands cleaning agents; relay output directly drives magnetic locks; dual-antenna RX improves read reliability near metal doors. | Use Scenario: Fixed-mount station on production line for scanning tools, jigs, or pallets at workstation checkpoints. IC Role / Device Role / Timing Role: Centralized HF reader collecting UID and user memory from Tag-it HF-I tags, buffering data in 256 kB RAM before host upload. Use Value: Adjustable 0.5–10W output enables consistent reads across varying tag orientations; RS485 daisy-chaining supports multi-station network topology. |
| Tool Management Kiosk | Library Media Checkout |
Use Scenario: Self-service kiosk where technicians scan tools before/after use to enforce accountability and prevent loss. IC Role / Device Role / Timing Role: Reader unit interfacing with local microcontroller to log tool UIDs, validate permissions, and trigger opto-output status indicators. Use Value: 1 kB EEPROM stores kiosk-specific settings (e.g., timeout, retry count); opto-isolated I/O safely interfaces with touchscreens and LED arrays. | Use Scenario: Patron-facing desk station scanning library books, DVDs, or ID cards compliant with ISO 15693. IC Role / Device Role / Timing Role: High-sensitivity HF reader decoding ASK/FSK signals from stacked media, communicating via RS232 to library management software. Use Value: Software-selectable modulation depth (10%–30%) minimizes false reads from adjacent items; 423.75 kHz ASK channel optimized for low-data-rate media tags. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar HF RFID reader applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RI-STU-655B-00 | Same mechanical design and firmware platform; supports additional ISO 14443 A/B transponders alongside ISO 15693. | Required where contactless smart cards (e.g., MIFARE) must coexist with ISO 15693 asset tags. | Select RI-STU-655B-00 only if dual-standard (ISO 14443 + ISO 15693) support is mandatory; otherwise RI-STU-655A-00 offers lower cost and simpler configuration. |
| SLR-655A-00 | Identical form factor and I/O but uses TI's TRF7970A analog front-end; lacks software-adjustable FSK receive bandwidth and has fixed 5W max output. | Suitable for cost-sensitive deployments where 5W output and single-modulation receive suffice. | Choose SLR-655A-00 when budget constraints outweigh need for 10W output scalability or dual-FSK demodulation flexibility. |
Compared with RI-STU-655B-00 and SLR-655A-00, the RI-STU-655A-00 uniquely balances ISO 15693 optimization, full 10W software-tuned RF power, and dual-ASK/FSK demodulation - making it the preferred choice for high-reliability industrial asset tracking where tag diversity and environmental noise are primary concerns.
Availability
RI-STU-655A-00 is available at Aetrix Electronics and suitable for industrial access control, factory-floor asset tracking, and library media management requiring stable component supply, long-term firmware support, and IP54-rated ruggedness.
Supply support for RI-STU-655A-00 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 designing analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The RI-STU-655A-00 belongs to TI's HF Reader System Series 6000, engineered specifically for robust, long-range ISO 15693 RFID deployment in manufacturing, logistics, and secure facility environments.
FAQ
What is the maximum RF output power of the RI-STU-655A-00, and what thermal requirement applies above 4W?
The RI-STU-655A-00 delivers up to 10W ±1 dB RF output power, adjustable in 0.25W software steps. When operating above 4W, an external heat sink with thermal resistance ≤0.8 K/W must be installed to maintain safe junction temperature and ensure continuous operation within the -20°C to +55°C range. This requirement is specified in the official HF Reader System Series 6000 datasheet and verified in thermal validation reports.
Does the RI-STU-655A-00 support both ISO 14443 and ISO 15693 standards?
No, the RI-STU-655A-00 supports only ISO 15693-compliant transponders (including Tag-it HF and Tag-it HF-I). It does not implement ISO 14443 A/B protocols. For dual-standard capability, TI offers the RI-STU-655B-00 variant, which extends support to MIFARE and other contactless smart cards while retaining full ISO 15693 functionality.
How is communication interface selection (RS232 vs. RS485) configured on the RI-STU-655A-00?
Interface selection is performed via a physical jumper located inside the RI-STU-655A-00 housing near the DB9 connector. The default position configures RS232 for point-to-point connections; moving the jumper to the alternate position enables RS485 for multi-drop networks supporting up to 32 readers. No firmware change or software setting is required - the hardware jumper determines electrical layer behavior.
Can firmware updates be performed remotely on the RI-STU-655A-00, and what memory stores the firmware?
Yes, firmware updates for the RI-STU-655A-00 are performed remotely via its RS232 or RS485 interface using TI's official update utility. Firmware resides in 512 kB of on-board Flash memory, which supports field upgrades without disassembly or programming hardware. Each update preserves EEPROM-stored configuration parameters and requires no manual reset sequence.
What are the electrical ratings and isolation specifications of the digital I/O on the RI-STU-655A-00?
The RI-STU-655A-00 provides two opto-coupled digital inputs (max 24 V DC / 20 mA) and two opto-coupled digital outputs (24 V DC / 30 mA), all galvanically isolated per IEC 60747-5-5. The relay output is rated 24 V DC / 60 W (resistive load), SPDT, with mechanical life ≥100,000 cycles. Isolation voltage between I/O and logic ground exceeds 3.75 kV RMS.
RI-STU-655A-00 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 6550
- Package/Case:
- 300mm x 200mm x 160mm
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Read/Write
- Frequency:
- 13.56MHz
- Interface:
- RS 232, RS 485
- Standards:
- ISO 15693
- Supplier Device Package:
- -
RI-STU-655A-00 FAQ
1.How can I place an order for RI-STU-655A-00 through Aetrix?
Please submit a Request for Quotation (RFQ) for RI-STU-655A-00 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-STU-655A-00 reliable?
The price and inventory of RI-STU-655A-00 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RI-STU-655A-00 is usually 5 days.
3.What payment methods are accepted for RI-STU-655A-00?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RI-STU-655A-00 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RI-STU-655A-00?
RI-STU-655A-00 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RI-STU-655A-00 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-STU-655A-00?
For technical support, including RI-STU-655A-00 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RI-STU-655A-00 requirements.
6.How does Aetrix verify that RI-STU-655A-00 is sourced from the original manufacturer or authorized distributors?
All RI-STU-655A-00 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-STU-655A-00 meets industry standards.
7.What is the process for return or replacement of RI-STU-655A-00?
All RI-STU-655A-00 units undergo pre-shipment inspection (PSI). If there is an issue with RI-STU-655A-00, 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-STU-655A-00 part is unused and in its original packaging.
Return procedure for RI-STU-655A-00:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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