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STMicroelectronics STM32L552RET6
- Part No.:
- STM32L552RET6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM32L552RET6.pdf
- Description:
- IC MCU 32BIT 512KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:644
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Product details
Overview
STM32L552RET6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M33 32-bit microcontroller with TrustZone® security, FPU, and integrated SMPS. It delivers 165 DMIPS at up to 110 MHz, features 512 KB dual-bank Flash with read-while-write, 256 KB SRAM (64 KB with hardware parity), and operates from 1.71 V to 3.6 V across –40 °C to 125 °C. It targets secure, battery-constrained IoT edge nodes requiring cryptographic integrity and sub-μA standby operation.
For engineers reviewing the STM32L552RET6 datasheet, STM32L552RET6 pinout, STM32L552RET6 application, or STM32L552RET6 equivalent, key selection criteria include TrustZone-enabled peripheral isolation, SMPS efficiency in Run mode (62 μA/MHz @ 3 V), ULPMark-CP® score of 370, and LQFP64 package compatibility with industrial sensor hubs and secure wearable gateways.
Technical Context
The STM32L552RET6 implements a dual-core security architecture: the Cortex-M33 core executes secure/non-secure code in isolated memory regions enforced by SAU and GTZC, while TrustZone-aware peripherals (e.g., AES, HASH, RNG) are dynamically assigned to secure or non-secure worlds. Its FlexPowerControl system enables fine-grained power gating per peripheral domain.
It integrates three PLLs (system, USB/audio, ADC), ART Accelerator with 8-KB instruction cache for zero-wait-state Flash execution, and dual 12-bit ADCs sampling at 5 Msps with hardware oversampling up to 16-bit resolution. The embedded SMPS supports external inductor-based step-down conversion with <62 μA/MHz efficiency in active mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M33 with TrustZone, FPU, MPU - enables secure firmware partitioning and deterministic real-time control. |
| Max Clock Frequency | 110 MHz - supports high-throughput sensor fusion and TLS stack execution without external clock sources. |
| Flash Memory | 512 KB dual-bank - allows seamless firmware updates via bank swapping without application interruption. |
| SRAM | 256 KB total, including 64 KB with hardware parity - ensures data integrity for critical runtime variables and crypto keys. |
| Ultra-Low-Power Modes | 17 nA Shutdown, 222 nA Standby with RTC - extends coin-cell battery life to >10 years in maintenance-free remote sensors. |
| Analog Peripherals | 2×12-bit ADC (5 Msps), 2×12-bit DAC, 2×OPAMP, 2×comparator - enables local signal conditioning and closed-loop control without external ICs. |
| Security Features | TrustZone, 96-bit unique ID, NIST SP800-90B TRNG, HASH accelerator, SFI with RSS - meets PSA Level 3 and SESIP certification prerequisites. |
Pinout & Package
LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, industrial temperature grade (–40 °C to 125 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main digital supply input | Accepts 1.71–3.6 V; powers core, SRAM, and most peripherals; requires local 100 nF + 4.7 µF decoupling. |
| VSS | Digital ground reference | Must be connected to low-impedance PCB ground plane; separate analog/digital ground routing recommended. |
| VBAT | Backup power supply | Supplies RTC and 32×32-bit backup registers during main power loss; supports coin-cell or supercap connection. |
| NRST | Active-low reset input | Asynchronous reset pin; internal pull-up; compatible with open-drain reset supervisors and push-button debouncing. |
| PA0–PA15 | General-purpose I/O bank A | Up to 114 fast I/Os total; most 5 V-tolerant; support 14 I/Os with independent 1.08–3.6 V supply for mixed-voltage interfacing. |
| PC13–PC15 | RTC oscillator inputs | Connects to 32.768 kHz crystal; internal load capacitors configurable; supports calibration for ±1 ppm accuracy. |
| PF0–PF1 | SMPS control outputs | Drive external PMOS/NMOS in buck converter topology; enable dynamic voltage scaling between 0.9 V and 1.2 V core domains. |
Key Features
| Feature | Design Value |
|---|---|
| TrustZone-enforced peripheral isolation | GTZC controller assigns peripherals (e.g., AES, RNG, GPIO banks) to secure/non-secure worlds at boot time - prevents side-channel leakage of crypto keys. |
| ART Accelerator with 8-KB cache | Enables 0-wait-state execution from Flash at 110 MHz - eliminates performance penalty of on-chip code storage vs. external XIP. |
| Embedded SMPS with dynamic scaling | Reduces active-mode current to 62 μA/MHz @ 3 V - cuts power by ~42% versus LDO-only operation in battery-powered applications. |
| ULPMark-CP® score of 370 | Industry-standard benchmark confirming lowest energy per cycle among Cortex-M33 MCUs - validates efficiency claims across sleep/wake transitions. |
| Secure firmware installation (SFI) | Uses embedded Root Secure Services (RSS) to validate and install signed firmware images - eliminates need for external secure element in OTA update paths. |
Applications
| Industrial Wireless Sensor Node | Secure Wearable Health Monitor |
|---|---|
Use Scenario: Battery-powered vibration/temperature node transmitting encrypted telemetry via LoRaWAN every 15 minutes. IC Role / Device Role / Timing Role: Main MCU executing sensor fusion, AES-GCM encryption, and low-power scheduler; RTC triggers periodic wake-up and timestamping. Use Value: 17 nA Shutdown mode extends CR2032 life beyond 7 years; dual-bank Flash enables field-upgradable firmware without downtime. |
Use Scenario: ECG patch with real-time arrhythmia detection, Bluetooth LE connectivity, and tamper-resistant health data logging. IC Role / Device Role / Timing Role: Secure host processor running TF-M compliant trusted firmware; OPAMPs condition analog ECG signals; TRNG seeds session keys. Use Value: TrustZone isolates BLE stack and health algorithms from untrusted apps; 222 nA Standby with RTC preserves state during sleep cycles. |
| Smart Utility Meter Interface | Asset Tracking Gateway |
Use Scenario: Sub-metering module interfacing with PLC or RF mesh networks, storing billing data in encrypted EEPROM emulation. IC Role / Device Role / Timing Role: Trusted execution environment for secure metering firmware; CRC unit validates firmware integrity on boot. Use Value: 512-byte OTP stores device-specific keys; RDP level 2 prevents flash readout; HDP protects bootloader from modification. |
Use Scenario: GPS-enabled logistics tracker with cellular fallback, motion-triggered reporting, and geo-fence alerts. IC Role / Device Role / Timing Role: Central controller managing GNSS acquisition, LTE modem handshaking, and low-power motion detection via LPTIM3. Use Value: 5 µs wakeup from Stop mode enables immediate response to accelerometer interrupts; FDCAN supports CAN bus diagnostics in fleet vehicles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power secure MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32U575RIT6 | Higher max frequency (160 MHz), larger Flash (2 MB), enhanced SMPS with integrated inductor driver - but no LQFP64 option; only UFBGA132/WLCSP81. | Better suited for complex RTOS-based edge AI inference; less suitable for legacy LQFP64 PCB footprints. | Select when needing >110 MHz throughput or >512 KB Flash; avoid if board layout is fixed to LQFP64. |
| NXP LPC55S69JBD100 | Arm Cortex-M33 with TrustZone, 320 KB Flash, 256 KB SRAM, but lacks embedded SMPS and has higher 110 μA/MHz Run current. | Stronger DSP acceleration via HiFi4 DSP core; weaker ultra-low-power profile - not viable for >5-year battery life designs. | Prefer for audio-centric applications requiring DSP offload; reject for sub-μA standby-critical deployments. |
Compared with STM32U575RIT6, the STM32L552RET6 offers proven LQFP64 compatibility and lower static power in deep-sleep modes; versus LPC55S69JBD100, it delivers superior energy efficiency (370 vs. 240 ULPMark-CP®) and integrated power conversion - making it optimal for cost-sensitive, long-life industrial sensor nodes.
Availability
STM32L552RET6 is available at Aetrix Electronics and suitable for industrial wireless sensor nodes, secure wearable health monitors, smart utility meter interfaces, and asset tracking gateways requiring stable component supply and long-term lifecycle assurance.
Supply support for STM32L552RET6 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 management ICs, MEMS, and automotive semiconductors since 1987.
The STM32L5 series targets ultra-low-power, security-critical embedded applications - combining Arm TrustZone with flexible power architectures to serve industrial IoT, medical wearables, and smart infrastructure markets.
FAQ
What is the maximum operating temperature range for STM32L552RET6?
The STM32L552RET6 is qualified for industrial operation from –40 °C to +125 °C ambient temperature. This rating applies to all LQFP64 variants and is verified per JEDEC JESD22-A108. Thermal derating begins above 105 °C ambient when operating at full 110 MHz clock with all peripherals active.
Does STM32L552RET6 support USB Type-C Power Delivery?
Yes - it integrates a dedicated USB Type-C™/Power Delivery controller (UCPD) compliant with USB PD 3.0 specification. The UCPD block handles BMC physical layer signaling, PD protocol stack offload, and VCONN switching without CPU intervention, enabling compact, single-chip USB-C charger negotiation.
How does the embedded SMPS differ from using an external DC-DC converter?
The integrated SMPS replaces external buck regulators by embedding control logic, PWM drivers, and feedback circuitry. It reduces BOM count by ≥3 components, improves transient response via direct VDDCORE monitoring, and enables dynamic voltage scaling synchronized with CPU frequency - achieving 62 μA/MHz versus typical 90–110 μA/MHz with discrete solutions.
Can STM32L552RET6 execute code directly from external OCTOSPI memory?
No - the OCTOSPI interface supports XIP (execute-in-place) only when paired with the ART Accelerator's instruction cache and specific memory-mapped configuration. Code must first be loaded into internal Flash or SRAM; OCTOSPI serves as high-bandwidth data storage (e.g., firmware images, logs) with up to 133 MHz DDR timing.
STM32L552RET6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-LQFP
- Series:
- STM32L5
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M33
- Core Size:
- 32-Bit Single-Core
- Speed:
- 110MHz
- Connectivity:
- CANbus, I2C, IrDA, LINbus, MMC/SD, QSPI, SAI, SPI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, WDT
- Number of I/O:
- 52
- Program Memory Size:
- 512KB (512K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 256K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- A/D 16x12b; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L552RET6 FAQ
1.How can I place an order for STM32L552RET6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L552RET6 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 STM32L552RET6 reliable?
The price and inventory of STM32L552RET6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L552RET6 is usually 5 days.
3.What payment methods are accepted for STM32L552RET6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L552RET6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L552RET6?
STM32L552RET6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L552RET6 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 STM32L552RET6?
For technical support, including STM32L552RET6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L552RET6 requirements.
6.How does Aetrix verify that STM32L552RET6 is sourced from the original manufacturer or authorized distributors?
All STM32L552RET6 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 STM32L552RET6 meets industry standards.
7.What is the process for return or replacement of STM32L552RET6?
All STM32L552RET6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L552RET6, 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 STM32L552RET6 part is unused and in its original packaging.
Return procedure for STM32L552RET6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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