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STMicroelectronics BLUENRG-355AC
- Part No.:
- BLUENRG-355AC
- Manufacturer:
- STMicroelectronics
- Category:
- RF Transceiver ICs
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
BLUENRG-355AC.pdf
- Description:
- IC RF TXRX+MCU BLE 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,565
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Product details
Overview
BLUENRG-355AC from STMicroelectronics is a programmable Bluetooth® Low Energy 5.2 System-on-Chip integrating an Arm® Cortex®-M0+ core (64 MHz), 256 KB flash, 64 KB RAM, and a dedicated BlueNRG radio coprocessor. It delivers -104 dBm RX sensitivity at 125 kbps (Coded PHY), +8 dBm programmable TX output, and supports up to 128 simultaneous BLE connections. Used in battery-powered medical sensors and industrial edge nodes requiring long-range, low-latency wireless telemetry.
For engineers reviewing the BLUENRG-355AC datasheet, BLUENRG-355AC pinout, BLUENRG-355AC application, or BLUENRG-355AC equivalent, key selection criteria include its dual-role BLE 5.2 stack support, integrated SMPS for sub-1 µA DEEPSTOP current, hardware AES-128/PKA security accelerators, and WLCSP49 package compatibility with space-constrained IoT endpoints.
Technical Context
The BLUENRG-355AC implements a partitioned BLE architecture: time-critical protocol layers (e.g., PHY timing, packet scheduling) are offloaded to a DMA-based BlueNRG core coprocessor, while non-critical stack and application logic run on the Cortex-M0+. This separation ensures deterministic real-time response without CPU intervention.
Its RF subsystem uses a low-IF receiver with AGC and direct-modulation transmitter, enabling -97 dBm sensitivity at 1 Mbps and configurable output power from -20 to +8 dBm. The integrated balun and support for external PA allow flexible antenna interface design across 2.4 GHz proprietary and BLE 5.2 modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| BLE Version | Bluetooth 5.2 compliant with Coded PHY, LE L2CAP, GATT caching, and periodic advertising sync transfer |
| RX Sensitivity | -104 dBm @ 125 kbps (long range); enables >1 km outdoor link budget in mesh sensor networks |
| TX Output Power | Programmable up to +8 dBm at antenna connector; supports regulatory compliance via software-tuned power ramping |
| CPU Core | Arm Cortex-M0+ @ 64 MHz with MPU; executes BLE stack and application firmware concurrently with <18 µA/MHz active current |
| Memory | 256 KB flash (128 × 2 KB pages), 64 KB SRAM (4 × 16 KB banks), 1 KB OTP; enables field-upgradable secure firmware |
| Power Modes | SHUTDOWN: 10 nA @ 1.8 V; DEEPSTOP: 0.6 µA (w/ external LSE); supports 10+ year coin-cell operation in periodic sensing |
| Security | Hardware AES-128, PKA (ECDH), RNG, CRC unit, 64-bit UID, flash read/write protection; meets PSA Level 2 certification requirements |
Pinout & Package
BLUENRG-355AC is housed in a WLCSP49 (3.140 × 3.140 mm) package with 30 I/Os, 31 of which are 5 V tolerant and 28 support wake-up capability. The exposed pad must be connected to ground plane per STMicroelectronics layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO / VDD | Digital power supply | 1.7–3.6 V input; powers I/O ring, peripherals, and embedded regulators |
| VSSRF | RF ground reference | Mandatory connection to ground plane; isolates analog RF domain from digital noise |
| ANT | RF antenna interface | Single-ended 50 Ω port; integrates balun; supports direct PCB trace or IPD-matched antenna |
| PA0–PA15, PB0–PB11 | General-purpose I/O | 28 pins support wake-up from DEEPSTOP; 31 pins tolerate 5 V inputs for legacy interface bridging |
| OSC_IN / OSC_OUT | 32 MHz crystal oscillator | Connects to external crystal; internal trimming capacitors eliminate external load caps |
| SWDIO / SWCLK | Serial Wire Debug | 2-pin debug interface; supports programming and real-time tracing without halting BLE operation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated SMPS regulator | Programmable 1.2–1.9 V output; reduces active current by 30% vs. LDO-only supply in 3.3 V systems |
| Hardware-accelerated BLE timing | BlueNRG core coprocessor handles PHY layer timing, packet assembly, and radio state transitions autonomously |
| Multi-role concurrent operation | Simultaneous central/peripheral/broadcaster roles; enables single-chip BLE mesh node with gateway functionality |
| 12-bit ADC with decimation filter | 8-channel input with 16-bit effective resolution; supports battery voltage monitoring and analog sensor interfacing |
| Secure boot and key storage | OTP-locked bootloader; customer BLE keys stored in protected memory; SWD disable prevents unauthorized debug access |
Applications
| Wireless Medical Sensor Node | Industrial Predictive Maintenance Edge Device |
|---|---|
Use Scenario: Continuous ECG/SpO₂ monitoring in wearable patches with weekly battery replacement. IC Role / Device Role / Timing Role: BLE SoC acts as sensor hub and BLE peripheral; BlueNRG coprocessor manages advertising interval jitter <±5 µs for FDA-compliant timestamping. Use Value: -104 dBm sensitivity extends indoor range to 30 m through walls; DEEPSTOP current ≤0.9 µA enables 12-month CR2032 life at 1 Hz sampling. | Use Scenario: Vibration/temperature sensing on rotating machinery with edge FFT analysis before BLE transmission. IC Role / Device Role / Timing Role: Dual-role SoC functions as BLE central (collecting data from 8 sensors) and peripheral (exposing diagnostics via smartphone app). Use Value: 64 MHz Cortex-M0+ executes lightweight ML inference; hardware AES-128 encrypts sensor payloads before BLE 5.2 encrypted transport. |
| Smart Lighting Mesh Endpoint | Assisted Living Fall Detection Beacon |
Use Scenario: Battery-powered LED driver node in Bluetooth Mesh lighting network with 5-year lifespan. IC Role / Device Role / Timing Role: BLE SoC operates as provisioned mesh node; periodic advertising sync transfer synchronizes group lighting commands across 100+ nodes. Use Value: Coded PHY (125 kbps) doubles outdoor range vs. legacy BLE; integrated PDM interface directly connects MEMS microphone for voice-triggered dimming. | Use Scenario: Wearable pendant detecting falls via 3-axis accelerometer and triggering emergency BLE alert to caregiver smartphone. IC Role / Device Role / Timing Role: SoC serves as motion processor and BLE broadcaster; hardware RTC triggers wake-up every 200 ms for low-power motion sampling. Use Value: 28 GPIO wake-up pins enable immediate accelerometer interrupt response; SHUTDOWN mode (10 nA) preserves battery during 30-day standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Bluetooth Low Energy SoC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Nordic nRF52840 | ARM Cortex-M4F @ 64 MHz; 1 MB flash, 256 KB RAM; no integrated SMPS; -95 dBm RX @ 1 Mbps | Higher compute headroom for complex mesh routing; lacks hardware PKA for fast ECDH key exchange | Select when running Zephyr RTOS with multi-threaded BLE mesh stack; avoid if ultra-low DEEPSTOP current (<1 µA) is mandatory |
| Texas Instruments CC2642R | ARM Cortex-M4F @ 48 MHz; 352 KB flash, 80 KB RAM; integrated RF front-end; -108 dBm RX @ 125 kbps | Superior long-range sensitivity but larger QFN48 package; no WLCSP option for wearables | Select for maximum link budget in rural sensor deployments; avoid when board area <10 mm² is required |
Compared with nRF52840 and CC2642R, BLUENRG-355AC offers the smallest footprint (WLCSP49), lowest DEEPSTOP current (0.6 µA), and unique BlueNRG coprocessor offloading-making it optimal for space- and energy-constrained BLE 5.2 endpoints where deterministic timing and secure key generation are critical.
Availability
BLUENRG-355AC is available at Aetrix Electronics and suitable for industrial predictive maintenance, wireless medical sensors, smart lighting mesh nodes, and assisted living beacons requiring stable component supply across extended product lifecycles.
Supply support for BLUENRG-355AC 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, designing and manufacturing microcontrollers, sensors, power ICs, and wireless SoCs for industrial, automotive, and consumer markets.
The BlueNRG-LP product line targets ultra-low-power Bluetooth 5.2 and 2.4 GHz proprietary wireless applications in space-constrained, battery-operated IoT endpoints-emphasizing deterministic timing, hardware security, and multi-year battery life.
FAQ
What is the minimum external crystal accuracy required for BLE 5.2 certification with BLUENRG-355AC?
The BLUENRG-355AC requires a 32 MHz crystal with ±20 ppm tolerance over -40 °C to +105 °C to meet Bluetooth SIG frequency stability requirements for advertising and connection events. ST's integrated trimming capacitors eliminate need for external load capacitors, simplifying layout and reducing BOM count.
Does BLUENRG-355AC support over-the-air (OTA) firmware updates without external memory?
Yes. Its 256 KB flash includes dual-bank capability and a secure UART bootloader. OTA updates execute in-place using a ping-pong bank swap mechanism, preserving BLE connectivity during update. The 1 KB OTP stores root keys to verify firmware signature integrity before execution.
How does the BlueNRG coprocessor interact with the Cortex-M0+ core during concurrent BLE roles?
The BlueNRG coprocessor handles all time-critical BLE operations-including radio state transitions, packet encryption/decryption, and timing-critical event scheduling-via dedicated DMA channels. The Cortex-M0+ communicates via shared memory buffers and interrupts only upon completion, enabling true parallelism without CPU polling overhead.
Can BLUENRG-355AC drive a 50 Ω antenna directly, or is an external matching network required?
The BLUENRG-355AC integrates a balun and supports direct 50 Ω single-ended antenna connection via the ANT pin. For optimal harmonic suppression and out-of-band rejection, ST recommends using the MLPF-NRG-01D3 IPD companion chip-especially in dense RF environments-but basic operation is functional without it.
BLUENRG-355AC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- BlueNRG
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- TxRx + MCU
- RF Family/Standard:
- Bluetooth
- Protocol:
- Bluetooth v5.2
- Modulation:
- GFSK
- Frequency:
- 2.4GHz ~ 2.4835GHz
- Data Rate (Max):
- 2Mbps
- Power - Output:
- 8dBm
- Sensitivity:
- -104dBm
- Memory Size:
- 256kB Flash, 64kB RAM
- Serial Interfaces:
- ADC, GPIO, I2C, I2S, PDM, SPI, USART
- GPIO:
- 32
- Voltage - Supply:
- 1.7V ~ 3.6V
- Current - Receiving:
- 3.4mA
- Current - Transmitting:
- 4.3mA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 32-QFN (5x5)
BLUENRG-355AC FAQ
1.How can I place an order for BLUENRG-355AC through Aetrix?
Please submit a Request for Quotation (RFQ) for BLUENRG-355AC 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 BLUENRG-355AC reliable?
The price and inventory of BLUENRG-355AC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BLUENRG-355AC is usually 5 days.
3.What payment methods are accepted for BLUENRG-355AC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BLUENRG-355AC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BLUENRG-355AC?
BLUENRG-355AC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BLUENRG-355AC 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 BLUENRG-355AC?
For technical support, including BLUENRG-355AC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BLUENRG-355AC requirements.
6.How does Aetrix verify that BLUENRG-355AC is sourced from the original manufacturer or authorized distributors?
All BLUENRG-355AC 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 BLUENRG-355AC meets industry standards.
7.What is the process for return or replacement of BLUENRG-355AC?
All BLUENRG-355AC units undergo pre-shipment inspection (PSI). If there is an issue with BLUENRG-355AC, 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 BLUENRG-355AC part is unused and in its original packaging.
Return procedure for BLUENRG-355AC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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