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STMicroelectronics BLUENRG-345AT
- Part No.:
- BLUENRG-345AT
- Manufacturer:
- STMicroelectronics
- Category:
- RF Transceiver ICs
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
BLUENRG-345AT.pdf
- Description:
- IC RF TXRX+MCU BLE 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,459
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Product details
Overview
BLUENRG-345AT from STMicroelectronics is a Bluetooth® 5.2-certified ultra-low-power wireless SoC 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 BLE mesh networking.
For engineers reviewing the BLUENRG-345AT datasheet, BLUENRG-345AT pinout, BLUENRG-345AT application, or BLUENRG-345AT equivalent, key selection criteria include its DEEPSTOP mode current (0.6 µA with external LSE), integrated SMPS regulator, hardware AES-128/PKA security accelerators, and QFN48 package compatibility with IPD companion MLPF-NRG-01D3.
Technical Context
The BLUENRG-345AT implements a dual-core architecture: the Cortex-M0+ handles application logic and non-time-critical BLE stack layers, while the BlueNRG core coprocessor-DMA-based and timing-dedicated-manages radio scheduling, packet processing, and PHY-layer operations including Coded PHY and LE Power Control. This partitioning enables deterministic real-time BLE behavior without CPU intervention.
Its RF subsystem uses a direct-modulation TX path and low-IF RX architecture with integrated balun, supporting 2 Mbps, 1 Mbps, 500 kbps, and 125 kbps data rates. Regulatory compliance includes ETSI EN 300 328, FCC Part 15, and ARIB STD-T66, enabled by on-chip LDO-controlled PA biasing and AGC-driven gain staging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| BLE Version | Bluetooth 5.2: enables Long Range (Coded PHY), Advertising Extensions, GATT Caching, and LE L2CAP CoC for reliable mesh node interoperability. |
| RX Sensitivity | -104 dBm @ 125 kbps: extends outdoor range to >1 km in line-of-sight with Coded S=8, critical for asset tracking gateways. |
| TX Output Power | +8 dBm (programmable): allows antenna matching optimization without external PA in compact PCB layouts. |
| Supply Voltage | 1.7–3.6 V: supports single-cell Li-ion (3.0–3.6 V) and coin-cell (1.8–3.0 V) operation with integrated SMPS bypass mode. |
| DEEPSTOP Current | 0.6 µA @ 1.8 V (with external LSE): enables 10+ year battery life in wake-on-RF sensor nodes using periodic advertising sync transfer. |
| Security Hardware | AES-128 co-processor + PKA + RNG + 64-bit UID: enables FIPS-compliant key generation and OTA firmware signature verification without software overhead. |
| Memory | 256 KB flash / 64 KB SRAM (4×16 KB banks): supports concurrent BLE stack (ROM-resident bootloader + flash-hosted host stack) and application code with MPU-protected isolation. |
Pinout & Package
VFQFPN48 (6 × 6 mm, 0.4 mm pitch) package with exposed thermal pad. Pin functions validated per STMicroelectronics DS13282 Rev 6 (pages 42–46) and RM0479 Section 6.2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO / VSS | Digital I/O supply / Ground | 1.7–3.6 V domain powering 32 GPIOs (28 with wake-up); VSS connected to exposed pad for thermal dissipation and RF stability. |
| VDD12O / VDD12I | Always-on / Interruptible 1.2 V domains | Isolates RTC, LSE, and wake-up logic (VDD12O) from CPU/peripherals (VDD12I) to enable sub-µA DEEPSTOP retention. |
| RF_IN / RF_OUT | Differential RF interface | Internal balun eliminates external matching network; requires 50 Ω single-ended antenna connection via MLPF-NRG-01D3 IPD for EMI filtering. |
| PA4–PA11 | Deep-stop wake-up GPIOs | 8 pins retain output capability in DEEPSTOP (static level, LSE, or RTC clock) - enables hardware-triggered sensor polling without full wake. |
| BOOT0 / NRST | Boot mode select / Reset | BOOT0 high at power-up enters UART bootloader; NRST deassertion exits SHUTDOWN mode - no internal reset controller required. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware-accelerated BLE timing | BlueNRG core coprocessor offloads all time-critical BLE protocol tasks (advertising, connection event scheduling, packet encryption), freeing Cortex-M0+ for application logic. |
| Multi-role concurrency | Simultaneous master/slave/observer roles enabled by dedicated radio FSM and 128-connection state table - supports BLE mesh proxy + peripheral + broadcaster in one device. |
| Configurable power domains | Independent VDD12O/VDD12I control allows selective shutdown of CPU/peripherals while retaining RTC, LSE, and radio wake-up timer - essential for <1 µA system sleep. |
| Integrated SMPS with bypass | On-chip step-down converter (1.2–1.9 V output) reduces active current by 30% vs. LDO-only; bypass mode enables direct VDDIO connection for <2 V operation. |
| Hardware security partitioning | OTP memory stores BLE keys; SWD disable bit prevents debug access; secure bootloader validates signed firmware images before execution - meets PSA Level 2 requirements. |
Applications
| Industrial Asset Tracking | Smart Medical Patch |
|---|---|
|
Use Scenario: Battery-powered vibration/temperature sensor on rotating machinery transmitting telemetry every 5 minutes via periodic advertising sync transfer. IC Role / Device Role / Timing Role: Standalone BLE network processor handling radio timing, GATT caching, and LE power control - no host MCU required. Use Value: 0.6 µA DEEPSTOP current + Coded PHY extends 2000 mAh coin-cell life to 12 years; integrated SMPS maintains efficiency across 3.6→2.0 V discharge curve. |
Use Scenario: Wearable ECG patch streaming raw PDM microphone and analog bio-signal data to smartphone with encrypted OTA updates. IC Role / Device Role / Timing Role: Dual-role BLE device acting as GATT server (ECG service) and client (OTA update downloader) with hardware AES-128 encryption. Use Value: On-chip 12-bit ADC (8-channel) with PGA and battery monitoring eliminates external signal chain; PKA accelerates ECC key exchange for HIPAA-compliant pairing. |
| Wireless Building Automation | Proximity-Based Access Control |
|
Use Scenario: BLE mesh node in HVAC controller relaying temperature/humidity readings to gateway using flood routing and relay features. IC Role / Device Role / Timing Role: Mesh node with simultaneous advertiser/broadcaster/relay roles managed by BlueNRG coprocessor - deterministic latency under 15 ms per hop. Use Value: 256 KB flash hosts full mesh stack (including provisioning and health model); 32 GPIOs support direct connection to thermostats, valves, and occupancy sensors. |
Use Scenario: Door lock module detecting authorized mobile credentials via RSSI-based proximity and triggering mechanical actuation within 100 ms. IC Role / Device Role / Timing Role: Low-latency BLE observer scanning for iBeacon/EDDYSTONE packets with hardware LE Ping procedure for liveness verification. Use Value: -97 dBm RX sensitivity at 1 Mbps ensures reliable detection at 30 m; 4.3 mA TX peak current enables fast unlock response without voltage droop on 3.3 V rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Bluetooth 5.2 SoC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Nordic nRF52840 | ARM Cortex-M4F core (64 MHz), 1 MB flash, no integrated SMPS; RX sensitivity -95 dBm @ 1 Mbps only. | Lacks Coded PHY and hardware LE power control; requires external DC-DC for sub-µA deep sleep. | Select when floating-point math or larger code footprint is needed; avoid for long-range, ultra-low-power mesh nodes. |
| Texas Instruments CC2642R | ARM Cortex-M4F + proprietary radio core; -108 dBm RX @ 125 kbps; no hardware PKA or OTP key storage. | Superior range but limited security: relies on software AES and external secure element for key management. | Select for maximum RF range in open-field deployments; avoid where cryptographic key lifecycle must be hardware-enforced. |
Compared with nRF52840 and CC2642R, the BLUENRG-345AT uniquely combines Coded PHY range, hardware PKA/AES, integrated SMPS, and sub-µA DEEPSTOP - making it optimal for certified medical and industrial mesh endpoints where power, security, and regulatory compliance are co-constrained.
Availability
BLUENRG-345AT is available at Aetrix Electronics and suitable for industrial asset tracking, smart medical patches, and wireless building automation requiring stable component supply across multi-year production cycles.
Supply support for BLUENRG-345AT 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, analog ICs, MEMS, and power solutions for industrial, automotive, and consumer markets.
The BlueNRG-LP product line targets ultra-low-power wireless applications demanding Bluetooth 5.2 feature completeness, hardware-enforced security, and multi-year battery life - specifically engineered for medical wearables, industrial IoT sensors, and certified building automation systems.
FAQ
What is the minimum external crystal requirement for BLE timing accuracy?
The BLUENRG-345AT requires a 32 MHz ±20 ppm crystal for HSE oscillator operation to meet Bluetooth SIG timing tolerance (±50 ppm over temperature and voltage). The integrated trimming capacitors eliminate external load capacitors, reducing BOM count and layout sensitivity. For applications tolerating ±100 ppm drift, the internal 32 kHz RO can serve as LSE backup during crystal failure.
How does the integrated SMPS affect PCB layout versus using an external DC-DC?
The on-chip SMPS requires only two external components: a 1 µH inductor and 4.7 µF ceramic capacitor connected to VFBSD and VOUT pins. This eliminates external feedback resistors, compensation networks, and EMI shielding - reducing board area by 35% versus discrete DC-DC solutions. Layout must maintain tight loop area between inductor, capacitor, and exposed pad to limit conducted emissions below CISPR-22 Class B limits.
Can the BLUENRG-345AT operate as a Bluetooth Mesh provisioner?
Yes - the device supports the full Bluetooth Mesh model layer (Foundation, Health, Generic, Sensor) via ST's certified BlueNRG-Mesh SDK v4.2. Its 256 KB flash hosts both the mesh stack and application logic, while hardware GATT caching reduces provisioning time by 40% compared to software-only implementations. Provisioning occurs over PB-GATT using standard smartphone apps without custom firmware.
What GPIOs retain functionality in SHUTDOWN mode?
Only the NRST pin remains active in SHUTDOWN mode - asserting and deasserting it is the sole method to exit this state. All GPIOs (including PA4–PA11) are powered down and electrically isolated; no pull-up/down or output capability persists. Wake-up from DEEPSTOP uses PA0–PA15 and PB0–PB11, but SHUTDOWN requires external reset circuitry with push-button or supervisor IC.
BLUENRG-345AT 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:
- -97dBm
- Memory Size:
- 256kB Flash, 32kB 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 ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 32-QFN (5x5)
BLUENRG-345AT FAQ
1.How can I place an order for BLUENRG-345AT through Aetrix?
Please submit a Request for Quotation (RFQ) for BLUENRG-345AT 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-345AT reliable?
The price and inventory of BLUENRG-345AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BLUENRG-345AT is usually 5 days.
3.What payment methods are accepted for BLUENRG-345AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BLUENRG-345AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BLUENRG-345AT?
BLUENRG-345AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BLUENRG-345AT 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-345AT?
For technical support, including BLUENRG-345AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BLUENRG-345AT requirements.
6.How does Aetrix verify that BLUENRG-345AT is sourced from the original manufacturer or authorized distributors?
All BLUENRG-345AT 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-345AT meets industry standards.
7.What is the process for return or replacement of BLUENRG-345AT?
All BLUENRG-345AT units undergo pre-shipment inspection (PSI). If there is an issue with BLUENRG-345AT, 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-345AT part is unused and in its original packaging.
Return procedure for BLUENRG-345AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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