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Texas Instruments CC2531F256RHAR
- Part No.:
- CC2531F256RHAR
- Manufacturer:
- Texas Instruments
- Category:
- RF Transceiver ICs
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
CC2531F256RHAR.pdf
- Description:
- IC RF TXRX+MCU 802.15.4 40VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,185
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Product details
Overview
CC2531F256RHAR from Texas Instruments is a USB-enabled 2.4-GHz IEEE 802.15.4 and ZigBee system-on-chip (SoC) integrating an enhanced 8051 MCU, 256-KB flash, 8-KB RAM, 2.4-GHz RF transceiver, AES coprocessor, and full-speed USB 2.0 interface. It delivers –92 dBm receiver sensitivity, programmable +4.5 dBm output power, and supports RF4CE remote control targets in TV/STB systems.
For engineers reviewing the CC2531F256RHAR datasheet, CC2531F256RHAR pinout, CC2531F256RHAR application, or CC2531F256RHAR equivalent, this page provides verified technical context, validated pin functions, real-world ZigBee USB dongle and firmware-upgradable node use cases, and two confirmed alternative SoCs with documented functional and integration differences.
Technical Context
The CC2531F256RHAR implements a fully integrated 2.4-GHz IEEE 802.15.4 PHY/MAC SoC with hardware-accelerated CSMA/CA, digital RSSI/LQI, and on-chip frequency synthesizer supporting 2394–2507 MHz operation at 250 kbps. Its dual-oscillator architecture combines a 32-MHz crystal oscillator for RF timing and a 32.768-kHz crystal for sleep timer accuracy.
USB functionality is implemented as a certified full-speed (12 Mbps) device with 1-KB dedicated FIFO, DMA access, and no external 48-MHz crystal required. Power management includes four low-power modes-Power Mode 1 (0.2 mA), Mode 2 (1 mA), Mode 3 (0.4 mA), and active RX/TX states-with sub-millisecond wake-up times.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Standard | IEEE 802.15.4-2003 compliant transceiver; enables ZigBee and RF4CE protocol stack implementation |
| Flash Memory | 256-KB in-system programmable flash; supports field firmware upgrades via USB without external programmer |
| RAM | 8-KB SRAM with retention in all power modes; sufficient for Z-Stack™ or RemoTI™ stack execution and application buffers |
| Receiver Sensitivity | –92 dBm at 1% PER; ensures robust link budget in interference-prone 2.4-GHz ISM band environments |
| USB Interface | USB 2.0 full-speed (12 Mbps) certified device with 1-KB FIFO and DMA support; eliminates need for external USB controller |
| Supply Voltage | 2.0 V–3.6 V operation; compatible with single-cell Li-ion, coin-cell, or regulated 3.3-V rails in portable USB dongles |
| Operating Temperature | –40°C to +125°C; qualified for industrial and consumer electronics deployment including set-top boxes and lighting controls |
Pinout & Package
CC2531F256RHAR uses a 40-pin QFN package (6 mm × 6 mm, RHA suffix) with exposed thermal pad requiring solid ground plane connection per TI design guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF_P / RF_N | Differential RF I/O | 50-Ω single-ended output via internal balun; connects directly to matching network and antenna |
| USB_P / USB_N | Full-speed USB differential pair | Compliant with USB 2.0 signaling; requires 27-Ω series resistors and proper PCB routing |
| P0_0–P0_7, P1_0–P1_7, P2_0–P2_4 | General-purpose I/O | 21 configurable GPIOs (19 × 4 mA, 2 × 20 mA); support UART, SPI, I²C, PWM, and ADC input |
| XOSC_Q1 / XOSC_Q2 | 32-MHz crystal oscillator terminals | Drive external 32-MHz fundamental-mode crystal; essential for RF carrier generation and MAC timing |
| XOSC32K_Q1 / XOSC32K_Q2 | 32.768-kHz crystal oscillator terminals | Enable precise sleep timer and low-power mode wake-up; required for battery-operated sensor nodes |
| RESET_N | Active-low reset input | Minimum 1-ms low pulse required for full system reset; synchronizes all clock domains and memory state |
| AVDD1–AVDD6 / DVDD1 / DVDD2 / DVDD_USB | Analog/digital power supplies | Separate analog (AVDD) and digital (DVDD) rails reduce noise coupling; DCOUPL pin decouples internal 1.8-V regulator |
Key Features
| Feature | Design Value |
|---|---|
| Hardware AES coprocessor | Offloads encryption/decryption from CPU; enables secure ZigBee key exchange and payload protection without software overhead |
| CSMA/CA hardware accelerator | Reduces CPU load during channel access arbitration; improves packet throughput and deterministic latency in dense networks |
| Integrated USB PHY + FIFO | Eliminates external USB transceiver and buffer ICs; reduces BOM count and PCB area in USB dongle designs |
| Five-channel DMA controller | Enables zero-CPU data movement between peripherals (e.g., ADC → RAM, USB FIFO → RAM); extends battery life in sensor applications |
| Battery monitor & temperature sensor | On-die analog monitoring with 12-bit ADC; supports runtime health checks and thermal throttling in unattended devices |
Applications
| ZigBee USB Dongle | RF4CE Remote Control Target |
|---|---|
|
Use Scenario: Plug-and-play USB adapter enabling PC-based ZigBee network commissioning, monitoring, and over-the-air firmware updates. IC Role / Device Role / Timing Role: Full-featured SoC acting as coordinator node with USB HID/CDC interface; handles MAC layer, security, and host communication. Use Value: Eliminates external microcontroller and RF front-end; leverages pre-certified Z-Stack™ integration for rapid time-to-market. |
Use Scenario: Embedded target in smart TV or set-top box accepting RF4CE remote commands without Bluetooth pairing overhead. IC Role / Device Role / Timing Role: RF4CE target SoC managing secure command reception, decryption, and IR generation for legacy AV control. Use Value: Integrates IR modulation circuitry and AES engine; replaces discrete MCU + transceiver + IR driver solutions. |
| Low-Power Wireless Sensor Node | Home Automation Gateway |
|
Use Scenario: Battery-powered occupancy or temperature sensor transmitting data every 5 minutes to a central hub. IC Role / Device Role / Timing Role: Ultra-low-power endpoint node using Power Mode 2 (1 mA sleep) and hardware-accelerated wake-up on timer or RF event. Use Value: Achieves multi-year battery life via sub-1-μA deep-sleep current and fast 0.1-ms wake-up from Power Mode 3. |
Use Scenario: Central hub bridging ZigBee sensors to Wi-Fi/Ethernet cloud infrastructure in smart home deployments. IC Role / Device Role / Timing Role: Dual-role coordinator and bridge processor handling concurrent ZigBee network management and USB host-side protocol translation. Use Value: Supports simultaneous USB CDC and HID endpoints; enables direct firmware update and diagnostic access via standard PC tools. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2.4-GHz IEEE 802.15.4 SoC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CC2530F256RHAR | Lacks integrated USB PHY and 1-KB USB FIFO; requires external USB controller or UART-to-USB bridge IC | Suitable for non-USB embedded nodes where cost and PCB area are prioritized over plug-and-play connectivity | Select CC2530F256RHAR when USB host interface is unnecessary and external serial bridge is acceptable |
| CC2652R1FZVZT | ARM Cortex-M4F core, 352-KB flash, integrated DC/DC converter, and BLE 5.0 + IEEE 802.15.4 dual-mode radio | Supports multi-protocol stacks (BLE, ZigBee, Thread) and higher RF performance (–100 dBm sensitivity) | Select CC2652R1FZVZT for future-proof, multi-standard designs requiring longer range and lower active current (5.9 mA RX) |
Compared with CC2531F256RHAR, CC2530F256RHAR removes USB integration but retains identical RF and MCU capabilities, while CC2652R1FZVZT offers modern ARM architecture, multi-protocol flexibility, and superior power efficiency-making it suitable for next-generation gateways and battery-constrained edge nodes.
Availability
CC2531F256RHAR is available at Aetrix Electronics and suitable for ZigBee USB dongles, RF4CE remote control targets, and low-power wireless sensor networks requiring stable component supply across production lifecycles.
Supply support for CC2531F256RHAR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The CC2531 product line was engineered specifically for cost-sensitive, USB-upgradable 2.4-GHz wireless applications-including ZigBee coordinator nodes and RF4CE remote control targets-prioritizing integration, regulatory compliance, and development acceleration.
FAQ
What is the primary function of the CC2531F256RHAR in a ZigBee USB dongle design?
The CC2531F256RHAR serves as the complete system-on-chip in a ZigBee USB dongle, integrating the 2.4-GHz IEEE 802.15.4 transceiver, enhanced 8051 MCU, 256-KB flash, 8-KB RAM, AES security coprocessor, and full-speed USB 2.0 interface. In the CC2531F256RHAR, USB functionality eliminates external controllers, while its Z-Stack™ compatibility enables immediate network commissioning and over-the-air updates without additional firmware layers.
Does the CC2531F256RHAR support both ZigBee and RF4CE protocols out of the box?
Yes-the CC2531F256RHAR supports both protocols via Texas Instruments' golden-unit-status protocol stacks: Z-Stack™ for ZigBee and RemoTI™ for RF4CE. The CC2531F256RHAR's hardware features-including hardware-accelerated CSMA/CA, AES encryption, and IR generation circuitry-are explicitly validated for RF4CE target implementations in TV/STB systems and ZigBee coordinator roles in USB dongles.
What are the critical power supply requirements for reliable operation of the CC2531F256RHAR?
The CC2531F256RHAR requires six analog (AVDD1–AVDD6) and three digital (DVDD1, DVDD2, DVDD_USB) supply pins, each rated for 2.0 V–3.6 V. AVDD rails must be independently decoupled with 100-nF capacitors close to the package; DVDD_USB powers the USB PHY and must be clean 3.3 V. The DCOUPL pin (Pin 40) decouples the internal 1.8-V digital regulator and must connect to a 1-μF capacitor to ground.
How does the CC2531F256RHAR achieve low-power operation in battery-powered sensor nodes?
The CC2531F256RHAR achieves ultralow power via four defined modes: Power Mode 1 (0.2 mA, 4-ms wake-up), Mode 2 (1 mA, sleep timer active), Mode 3 (0.4 mA, external interrupt wake), and active RX/TX states. Its 32.768-kHz crystal oscillator enables precise sleep timing, while hardware timers and DMA allow autonomous peripheral operation without CPU intervention-critical for extending battery life in CC2531F256RHAR-based sensor nodes.
Is the CC2531F256RHAR pin-compatible with other members of the CC253x family?
Yes-the CC2531F256RHAR shares the same RHA (QFN40) package and pinout with CC2531F128RHAR and CC2530 variants. All share identical RF_P/RF_N, USB_P/USB_N, XOSC_Q1/Q2, and GPIO assignments. However, CC2531F256RHAR requires 256-KB flash layout support in toolchains, and USB-related firmware initialization differs from non-USB CC2530 derivatives.
CC2531F256RHAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- TxRx + MCU
- RF Family/Standard:
- 802.15.4
- Protocol:
- Zigbee®
- Modulation:
- -
- Frequency:
- 2.4GHz
- Data Rate (Max):
- 250kbps
- Power - Output:
- 4.5dBm
- Sensitivity:
- -97dBm
- Memory Size:
- 256kB Flash, 8kB RAM
- Serial Interfaces:
- SPI, USART, USB
- GPIO:
- 21
- Voltage - Supply:
- 2V ~ 3.6V
- Current - Receiving:
- 20.5mA ~ 24.3mA
- Current - Transmitting:
- 28.7mA ~ 33.5mA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 40-VQFN (6x6)
CC2531F256RHAR FAQ
1.How can I place an order for CC2531F256RHAR through Aetrix?
Please submit a Request for Quotation (RFQ) for CC2531F256RHAR 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 CC2531F256RHAR reliable?
The price and inventory of CC2531F256RHAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CC2531F256RHAR is usually 5 days.
3.What payment methods are accepted for CC2531F256RHAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CC2531F256RHAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CC2531F256RHAR?
CC2531F256RHAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CC2531F256RHAR 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 CC2531F256RHAR?
For technical support, including CC2531F256RHAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CC2531F256RHAR requirements.
6.How does Aetrix verify that CC2531F256RHAR is sourced from the original manufacturer or authorized distributors?
All CC2531F256RHAR 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 CC2531F256RHAR meets industry standards.
7.What is the process for return or replacement of CC2531F256RHAR?
All CC2531F256RHAR units undergo pre-shipment inspection (PSI). If there is an issue with CC2531F256RHAR, 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 CC2531F256RHAR part is unused and in its original packaging.
Return procedure for CC2531F256RHAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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