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STMicroelectronics STM32L552RET6P
- Part No.:
- STM32L552RET6P
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM32L552RET6P.pdf
- Description:
- IC MCU 32BIT 512KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,330
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Product details
Overview
STM32L552RET6P from STMicroelectronics is an ultra-low-power Arm® Cortex®-M33 32-bit microcontroller with TrustZone® security, integrated FPU, 512 KB dual-bank Flash, 256 KB SRAM, and embedded SMPS step-down converter. It delivers 165 DMIPS at up to 110 MHz and achieves 370 ULPMark-CP® in battery-powered edge nodes requiring secure firmware updates and real-time sensor processing.
For engineers reviewing the STM32L552RET6P datasheet, STM32L552RET6P pinout, STM32L552RET6P application, or STM32L552RET6P equivalent, key selection criteria include TrustZone-enforced memory isolation, sub-100 nA standby current with RTC, 5 µs wakeup from Stop mode, and support for USB Type-C™ Power Delivery via dedicated UCPD peripheral.
Technical Context
The STM32L552RET6P implements a dual-core security architecture: the Cortex-M33 core executes secure/non-secure code in separate 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 dynamic voltage scaling between LDO and SMPS modes, achieving 62 µA/MHz at 3 V in SMPS mode.
It integrates three PLLs - one for system clock (up to 110 MHz), one for USB/SAI audio, and one for ADC sampling - alongside ART Accelerator with 8 KB instruction cache enabling zero-wait-state execution from Flash. The device supports dual-bank read-while-write Flash for seamless over-the-air firmware updates without interruption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M33 with TrustZone, FPU, MPU, 110 MHz max frequency |
| Flash Memory | 512 KB dual-bank Flash with read-while-write and ECC |
| SRAM | 256 KB total, including 64 KB with hardware parity check |
| Ultra-Low-Power Modes | 17 nA Shutdown, 108 nA Standby, 3.16 µA Stop2 with RTC |
| Security Features | TrustZone, RDP, HDP, SFI, active tamper detection, NIST SP800-90B TRNG |
| Analog Peripherals | 2×12-bit ADC (5 Msps), 2×12-bit DAC, 2×OPAMP, 2×comparator, DFSDM |
| Communication Interfaces | 1×UCPD, 1×USB FS, 4×I²C, 6×USART, 3×SPI, 2×SAI, 1×FDCAN, 1×SDMMC |
Pinout & Package
LQFP48 package (7 × 7 mm, 0.5 mm pitch), RoHS-compliant, with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main digital power supply | 1.71–3.6 V input; powers core, SRAM, and most peripherals |
| VSS | Digital ground reference | Common return path for digital circuitry; requires low-impedance connection to PCB ground plane |
| VBAT | Backup power supply | Supplies RTC and 32×32-bit backup registers during main power loss; operates down to 1.0 V |
| NRST | Active-low reset input | Asynchronous reset signal; internal pull-up; triggers system reset and clears security state |
| PA0 | General-purpose I/O / ADC1_IN0 / TIM2_CH1 | 5 V-tolerant; configurable as analog input for 12-bit ADC or timer capture channel |
| PA13 | SWDIO debug interface | Serial Wire Debug data I/O; used for programming and real-time debugging via SWD protocol |
| PA14 | SWCLK debug interface | Serial Wire Debug clock input; synchronous timing reference for SWD communication |
| PC13 | RTC oscillator input (LSE) | Connects to 32.768 kHz crystal; enables calendar RTC with alarm and calibration functions |
| PF0 | UCPD_CC1 (Type-C CC line) | Dedicated UCPD peripheral pin for USB Type-C cable orientation and power role detection |
| PF1 | UCPD_CC2 (Type-C CC line) | Second UCPD control channel pin; supports USB Power Delivery negotiation and VCONN switching |
Key Features
| Feature | Design Value |
|---|---|
| TrustZone-enforced memory partitioning | Hardware-isolated secure/non-secure memory regions with SAU configuration and GTZC enforcement |
| SMPS + LDO dual-regulator system | Configurable power delivery: SMPS achieves 62 µA/MHz @ 3 V; LDO supports noise-sensitive analog operation |
| ART Accelerator with 8 KB cache | Enables zero-wait-state execution from Flash at 110 MHz, eliminating CPU stalls during code fetch |
| Batch Acquisition Mode (BAM) | Permits autonomous peripheral operation (ADC, timers) while CPU remains in low-power mode, reducing system wakeups |
| Secure Firmware Installation (SFI) | Uses embedded Root Secure Services (RSS) to validate and install signed firmware images without external host |
Applications
| Wearable Health Monitor | Industrial Wireless Sensor Node |
|---|---|
Use Scenario: Continuous ECG/PPG signal acquisition with BLE transmission and on-device anomaly detection. IC Role / Device Role / Timing Role: Main controller executing secure sensor fusion algorithms, managing ultra-low-power ADC sampling in BAM, and handling encrypted BLE stack via TrustZone-protected memory. Use Value: 17 nA Shutdown mode extends coin-cell life beyond 5 years; 5 µs wakeup ensures timely response to arrhythmia events. | Use Scenario: Battery-powered vibration/temperature monitoring node transmitting data via LoRaWAN or NB-IoT. IC Role / Device Role / Timing Role: Host MCU coordinating multi-sensor polling, cryptographic signing of telemetry, and deterministic low-power scheduling using LPTIM3 and RTC alarms. Use Value: 108 nA Standby with 5 wakeup pins enables event-driven operation; SMPS efficiency reduces average current by 41% vs LDO-only mode. |
| Smart Building Access Terminal | Medical IoT Gateway |
Use Scenario: Secure door lock controller with capacitive touch keypad, NFC reader interface, and tamper-evident logging. IC Role / Device Role / Timing Role: TrustZone-secured root-of-trust platform authenticating credentials, managing securable GPIOs for lock actuation, and detecting physical tampering via TAMP peripheral. Use Value: Active tamper detection (voltage/frequency/temp) triggers immediate erase of HDP; 96-bit unique ID enables device identity binding. | Use Scenario: Edge gateway aggregating data from multiple BLE medical devices (pulse oximeters, glucose meters) and forwarding to cloud via TLS-secured Wi-Fi/Ethernet. IC Role / Device Role / Timing Role: Secure TLS offload engine using HASH accelerator and TRNG; manages dual-bank Flash for atomic OTA updates without service interruption. Use Value: 27400 SecureMark-TLS® score validates cryptographic throughput; dual-bank Flash enables fail-safe firmware rollback. |
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 |
|---|---|---|---|
| STM32U575RIT6Q | Higher performance (220 MHz Cortex-M33), larger Flash (2 MB), no UCPD, different pinout | Better suited for complex UI or AI inference; lacks native USB Type-C PD control | Select when needing >165 DMIPS or larger code footprint; verify UCPD absence aligns with system architecture |
| RA4M3AFGB | Arm Cortex-M4F (100 MHz), Renesas TrustZone, 1 MB Flash, no SMPS, different peripheral set | Stronger DSP capability but higher active current (110 µA/MHz); no integrated SMPS or UCPD | Prefer for motor control or audio DSP workloads where analog integration outweighs ultra-low-power requirements |
Compared with STM32U575RIT6Q and RA4M3AFGB, the STM32L552RET6P uniquely balances sub-100 nA standby, integrated UCPD, and SMPS efficiency-making it optimal for compact, battery-constrained USB-C–enabled endpoints where secure boot and rapid wakeup are critical.
Availability
STM32L552RET6P is available at Aetrix Electronics and suitable for wearable health monitors, industrial wireless sensor nodes, smart building access terminals, and medical IoT gateways requiring stable component supply across long-lifecycle deployments.
Supply support for STM32L552RET6P 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, sensors, and analog components for industrial, automotive, and consumer markets.
The STM32L5 series targets secure, energy-constrained edge applications-designed to enable certified firmware updates, hardware-rooted trust, and multi-year battery operation in resource-limited environments.
FAQ
What is the maximum operating frequency and how is it achieved?
The STM32L552RET6P achieves 110 MHz maximum CPU frequency using its Arm Cortex-M33 core with ART Accelerator enabled. The 8 KB instruction cache eliminates wait states during Flash execution, and the internal multispeed oscillator-auto-trimmed by the 32 kHz LSE-ensures ±0.25% accuracy without external crystal dependency for system clock generation.
How does TrustZone implementation differ from standard Cortex-M33 deployment?
This device implements TrustZone with ST-specific enhancements: Global TrustZone Controller (GTZC) enforces peripheral security attribution, Securable I/Os allow per-pin TrustZone assignment, and Hide Protection Area (HDP) provides immutable secure boot code storage. Unlike generic M33 implementations, GTZC integrates with TZSC to dynamically lock/unlock peripherals based on secure world state.
Can the embedded SMPS replace an external DC-DC converter?
Yes-the integrated SMPS step-down converter replaces external buck regulators for core voltage supply. It supports output voltages of 0.9 V, 1.0 V, or 1.1 V with external inductor/capacitor, delivering up to 200 mA. Its efficiency (up to 92%) reduces system-level power consumption versus LDO mode, especially above 10 MHz operation.
What interfaces support secure firmware updates out-of-the-box?
The STM32L552RET6P supports secure firmware updates via its Secure Firmware Installation (SFI) feature, leveraging embedded Root Secure Services (RSS) and TF-M (Trusted Firmware-M). Updates are cryptographically verified using SHA-256/HMAC keys stored in secure memory, with dual-bank Flash enabling atomic swap and rollback-no external secure element required.
STM32L552RET6P 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:
STM32L552RET6P FAQ
1.How can I place an order for STM32L552RET6P through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L552RET6P 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 STM32L552RET6P reliable?
The price and inventory of STM32L552RET6P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L552RET6P is usually 5 days.
3.What payment methods are accepted for STM32L552RET6P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L552RET6P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L552RET6P?
STM32L552RET6P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L552RET6P 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 STM32L552RET6P?
For technical support, including STM32L552RET6P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L552RET6P requirements.
6.How does Aetrix verify that STM32L552RET6P is sourced from the original manufacturer or authorized distributors?
All STM32L552RET6P 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 STM32L552RET6P meets industry standards.
7.What is the process for return or replacement of STM32L552RET6P?
All STM32L552RET6P units undergo pre-shipment inspection (PSI). If there is an issue with STM32L552RET6P, 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 STM32L552RET6P part is unused and in its original packaging.
Return procedure for STM32L552RET6P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM32L552RET6P Tags
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