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STMicroelectronics STM32WB35CEU6ATR
- Part No.:
- STM32WB35CEU6ATR
- Manufacturer:
- STMicroelectronics
- Category:
- RF Transceiver ICs
- Package:
- 48-UFQFN Exposed Pad
- Datasheet:
-
STM32WB35CEU6ATR.pdf
- Description:
- IC RF TXRX+MCU 802.15.4 48UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:1,442
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Product details
Overview
STM32WB35CEU6ATR from STMicroelectronics is a multiprotocol wireless 32-bit MCU integrating Arm® Cortex®-M4 with FPU (64 MHz), dedicated Cortex®-M0+ radio controller, Bluetooth® 5.4 and IEEE 802.15.4 PHY/MAC, -96 dBm RX sensitivity (BLE 1 Mbps), +6 dBm programmable TX power, and 256 KB SRAM. It targets battery-powered IoT edge nodes requiring concurrent BLE and Thread/Zigbee® operation in compact industrial sensors.
For engineers reviewing the STM32WB35CEU6ATR datasheet, STM32WB35CEU6ATR pinout, STM32WB35CEU6ATR application, or STM32WB35CEU6ATR equivalent, key selection criteria include dual-CPU real-time radio coexistence, integrated balun support, ultra-low-power Stop mode (2.1 µA + RTC + 256 KB RAM), and hardware AES-256/ECDSA security for OTA firmware updates.
Technical Context
The device implements a tightly coupled dual-core architecture: Cortex-M4 executes application firmware while Cortex-M0+ handles real-time Bluetooth LE and 802.15.4 protocol stack processing via IPCC interprocessor communication. RF subsystem includes integrated balun, RSSI-based TX power control, and support for advertising extensions and EATT.
Power management integrates an SMPS step-down converter with intelligent bypass mode, five-level BOR, and seven low-power modes - including Shutdown (13 nA), Standby (600 nA + RTC + 32 KB RAM), and Stop (2.1 µA + RTC + 256 KB RAM) - enabling multi-year battery life in sensor endpoints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU, 64 MHz max; enables DSP-intensive sensor fusion and real-time control without external coprocessor. |
| Radio Core | Dedicated Arm Cortex-M0+, offloads BLE/802.15.4 stack execution to guarantee deterministic timing and reduce M4 load. |
| RX Sensitivity | -96 dBm @ BLE 1 Mbps; ensures robust link budget in noisy industrial environments with >100 m range at 0 dBm TX. |
| TX Output Power | Programmable up to +6 dBm in 1 dB steps; allows precise RF link margin tuning per deployment without hardware change. |
| Memory | 256 KB SRAM (64 KB with parity), 1 MB flash with PCROP sector protection; supports secure dual-bank OTA updates and radio stack isolation. |
| Low-Power Mode | Stop mode: 2.1 µA + RTC + full 256 KB RAM retention; preserves application state during extended sleep, critical for periodic wake-up sensors. |
| Security | Hardware AES-256, PKA (RSA/ECC), TRNG, 96-bit unique ID; meets PSA Level 2 and SESIP requirements for secure boot and encrypted OTA. |
Pinout & Package
STM32WB35CEU6ATR uses a 48-pin UFQFPN package (7 × 7 mm, 0.5 mm pitch), optimized for space-constrained PCB layouts in wearable and node-class devices. Pinout supports single-ended RF I/O (RFIO), integrated balun interface, dual crystal inputs (32 MHz for CPU/radio, 32 kHz for RTC), and 72 fast I/Os (70 × 5 V-tolerant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RFIO | RF transceiver antenna interface | Single-ended 2.4 GHz port; connects directly to integrated balun or external matching network for regulatory-compliant radiated emission. |
| HSE_IN / HSE_OUT | 32 MHz crystal oscillator input/output | Drives both Cortex-M4 and Cortex-M0+ clocks; integrated trimming capacitors eliminate external load caps, reducing BOM count. |
| LSE_IN / LSE_OUT | 32 kHz RTC crystal interface | Enables calendar-timekeeping and low-power wake-up events with ±20 ppm accuracy over -40°C to +85°C. |
| VDD_RF | Dedicated RF power supply | Isolates analog RF domain from digital core; requires separate 1.2 V LDO or SMPS output to minimize noise coupling into RX path. |
| VBAT | Backup power supply | Retains RTC and 32 KB backup RAM during main power loss; supports coin-cell or supercapacitor backup for uninterrupted timekeeping. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-CPU Real-Time Radio Architecture | Separate Cortex-M0+ handles BLE/802.15.4 MAC/PHY in hard real-time, freeing M4 for application logic and sensor processing without scheduling conflicts. |
| Integrated Balun Support | Reduces external RF components by 3–4 passive parts; simplifies layout, improves yield, and maintains ETSI/FCC compliance without custom matching networks. |
| GATT Caching & EATT | Accelerates BLE connection throughput and reduces host CPU overhead during attribute reads/writes; essential for high-frequency sensor data streaming. |
| SMPS with Intelligent Bypass | Switches automatically to LDO mode below 10 mA load, eliminating switching noise during ultra-low-power operation while maintaining efficiency above 10 mA. |
| Hardware Crypto Acceleration | AES-256, PKA (ECC/ECDSA), and TRNG execute cryptographic operations in <100 µs; enables secure key exchange and signed firmware updates without software bottlenecks. |
Applications
| Smart Building Sensor Node | Industrial Wireless Actuator |
|---|---|
Use Scenario: Battery-powered temperature/humidity/occupancy sensor deployed in HVAC ducts or ceiling grids, transmitting data every 5 minutes via BLE mesh or Thread network. IC Role / Device Role / Timing Role: Dual-core MCU manages sensor acquisition, local decision logic (e.g., occupancy-triggered fan control), and concurrent BLE advertising + 802.15.4 association with border router. Use Value: 2.1 µA Stop mode extends 2×AA battery life beyond 5 years; integrated balun eliminates RF tuning labor during mass production. | Use Scenario: DIN-rail mounted valve controller receiving commands over Zigbee® 3.0, executing PID loop on analog feedback, and reporting status via BLE direct connection to maintenance tablet. IC Role / Device Role / Timing Role: Cortex-M4 runs real-time control loop (≤10 ms cycle), while Cortex-M0+ handles Zigbee® stack and BLE GATT caching for diagnostics. Use Value: Hardware AES-256 secures firmware updates against tampering; 70× 5 V-tolerant I/Os interface directly with legacy 24 V industrial sensors and actuators. |
| Medical Wearable Patch | Asset Tracking Tag |
Use Scenario: Disposable ECG patch transmitting raw waveform data via BLE to smartphone app, with motion-triggered wake-up and onboard QSPI flash for buffer storage during RF outage. IC Role / Device Role / Timing Role: Cortex-M4 performs real-time QRS detection and compression; Cortex-M0+ maintains BLE connection and handles advertising extension for multi-advertiser scanning. Use Value: 13 nA shutdown mode minimizes self-discharge during shelf life; integrated SMPS achieves >85% efficiency at 50 µA load, maximizing battery utilization. | Use Scenario: GPS-denied indoor asset tag using BLE direction finding (AoA/AoD) and 802.15.4-based time-of-flight ranging to locate equipment within 1 m accuracy in warehouses. IC Role / Device Role / Timing Role: MCU synchronizes dual-radio timing via shared 32 MHz clock; Cortex-M0+ executes precise 802.15.4 timestamping while M4 computes location algorithms. Use Value: Accurate RSSI and hardware timestamping enable sub-meter positioning; quad-SPI interface supports external flash for logging 30-day movement history. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiprotocol wireless MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32WB55CEU6 | 1 MB flash (vs. 512 KB), 256 KB SRAM same; adds USB 2.0 FS device, SAI audio interface, and LCD controller. | Suitable for feature-rich gateways or audio-enabled edge devices; over-spec for simple sensor nodes. | Select when USB connectivity, audio playback, or display driving is required; otherwise STM32WB35CEU6ATR offers lower cost and identical RF/performance for basic nodes. |
| nRF52840 DK | Single-core ARM Cortex-M4F (64 MHz), no dedicated radio CPU; BLE 5.0 only (no 802.15.4/Thread); -95 dBm RX sensitivity. | Limited to BLE-only use cases; lacks hardware-accelerated 802.15.4 MAC and dual-stack concurrency. | Choose only for BLE-centric designs without Thread/Zigbee® requirements; STM32WB35CEU6ATR provides guaranteed dual-protocol coexistence and superior security IP. |
Compared with STM32WB55CEU6 and nRF52840 DK, STM32WB35CEU6ATR delivers optimal balance of dual-protocol capability, ultra-low-power operation, and hardware security for cost-sensitive, battery-operated IoT nodes - avoiding over-engineered peripherals while ensuring certified radio stack reliability.
Availability
STM32WB35CEU6ATR is available at Aetrix Electronics and suitable for smart building sensors, industrial wireless actuators, medical wearables, and asset tracking tags requiring stable component supply across multi-year production cycles.
Supply support for STM32WB35CEU6ATR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog products for industrial, automotive, and consumer markets.
The STM32WB series is engineered specifically for secure, low-power, multiprotocol wireless edge devices - combining dual-core processing, certified BLE/802.15.4 stacks, and hardware crypto to accelerate development of production-ready IoT endpoints.
FAQ
What wireless protocols does STM32WB35CEU6ATR natively support?
STM32WB35CEU6ATR natively supports Bluetooth® 5.4 (including LE Audio, EATT, and advertising extensions) and IEEE 802.15.4-2011 PHY/MAC, enabling certified Thread 1.3 and Zigbee® 3.0 implementations. Both protocol stacks run concurrently on dedicated cores with hardware-accelerated security and timing-critical RF handling.
Does STM32WB35CEU6ATR include an integrated balun?
No, STM32WB35CEU6ATR does not integrate a balun on-die, but it includes dedicated RFIO pin design and internal matching circuitry optimized for use with ST's MLPF-WB-01E3 or MLPF-WB-02D3 integrated passive device (IPD) companion chips - reducing external component count to zero for balun functionality.
What is the maximum operating temperature range for STM32WB35CEU6ATR?
STM32WB35CEU6ATR is rated for industrial operation from -40°C to +85°C ambient temperature. Its thermal design and SMPS efficiency maintain stable RF performance and memory retention across this full range, validated per ETSI EN 300 328 and FCC Part 15 compliance testing.
How is secure firmware update implemented on STM32WB35CEU6ATR?
Secure firmware update uses Secure Firmware Installation (SFI), which validates OTA images via ECDSA signature using hardware PKA engine and customer-stored public keys. Images are decrypted and authenticated in SRAM before flash programming, with PCROP-protected sectors preventing unauthorized read/write access to radio stack and application code.
STM32WB35CEU6ATR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 48-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Type:
- TxRx + MCU
- RF Family/Standard:
- 802.15.4, Bluetooth
- Protocol:
- Bluetooth v5.3, Thread, Zigbee®
- Modulation:
- GFSK
- Frequency:
- 2.4GHz ~ 2.48GHz
- Data Rate (Max):
- 2Mbps
- Power - Output:
- 6dBm
- Sensitivity:
- -100dBm
- Memory Size:
- 512kB Flash, 96kB SRAM
- Serial Interfaces:
- ADC, GPIO, I2C, I2S, IrDA, JTAG, PWM, SPI, UART, USART, USB
- GPIO:
- 30
- Voltage - Supply:
- 1.62V ~ 3.6V
- Current - Receiving:
- 4.5mA ~ 9.2mA
- Current - Transmitting:
- 4.5mA ~ 12.7mA
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 48-UFQFPN (7x7)
STM32WB35CEU6ATR FAQ
1.How can I place an order for STM32WB35CEU6ATR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32WB35CEU6ATR 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 STM32WB35CEU6ATR reliable?
The price and inventory of STM32WB35CEU6ATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32WB35CEU6ATR is usually 5 days.
3.What payment methods are accepted for STM32WB35CEU6ATR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32WB35CEU6ATR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32WB35CEU6ATR?
STM32WB35CEU6ATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32WB35CEU6ATR 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 STM32WB35CEU6ATR?
For technical support, including STM32WB35CEU6ATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32WB35CEU6ATR requirements.
6.How does Aetrix verify that STM32WB35CEU6ATR is sourced from the original manufacturer or authorized distributors?
All STM32WB35CEU6ATR 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 STM32WB35CEU6ATR meets industry standards.
7.What is the process for return or replacement of STM32WB35CEU6ATR?
All STM32WB35CEU6ATR units undergo pre-shipment inspection (PSI). If there is an issue with STM32WB35CEU6ATR, 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 STM32WB35CEU6ATR part is unused and in its original packaging.
Return procedure for STM32WB35CEU6ATR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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