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STMicroelectronics STM32L081CZT6
- Part No.:
- STM32L081CZT6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM32L081CZT6.pdf
- Description:
- IC MCU 32BIT 192KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:5,030
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Product details
Overview
STM32L081CZT6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 192 KB Flash, 20 KB SRAM, and 6 KB EEPROM with ECC; features 12-bit ADC (1.14 Msps), AES-128 hardware encryption, and operates from 1.65 V to 3.6 V across –40 °C to 125 °C - deployed in battery-powered smart meters and wireless sensor nodes.
For engineers reviewing the STM32L081CZT6 datasheet, STM32L081CZT6 pinout, STM32L081CZT6 application, or STM32L081CZT6 equivalent, key selection criteria include standby current (0.29 µA), RTC + RAM retention in Stop mode (0.86 µA), 5 µs Flash wakeup time, and 31 I/Os with 5V tolerance - critical for energy-constrained industrial IoT endpoints.
Technical Context
The STM32L081CZT6 integrates a Cortex-M0+ core with MPU, running up to 32 MHz and delivering 0.95 DMIPS/MHz; its clock system includes factory-trimmed 16 MHz HSI (±1%), 32 kHz LSE for RTC calibration, and PLL for CPU scaling - enabling dynamic voltage/frequency management across low-power modes.
Its analog subsystem comprises two ultra-low-power comparators (wakeup capable down to 1.65 V), a 12-bit ADC with 16-channel multiplexing and 1.14 Msps sampling, and internal temperature sensor with calibrated reference - all supported by 7-channel DMA for autonomous peripheral operation without CPU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+ with MPU, 32 MHz max - enables deterministic real-time control with memory protection in resource-constrained firmware. |
| Memory | 192 KB Flash (ECC, read-while-write), 20 KB SRAM, 6 KB EEPROM (ECC) - supports robust firmware updates and nonvolatile data logging without external storage. |
| Low-Power Performance | 0.29 µA Standby (3 wakeup pins), 0.86 µA Stop + RTC + 20 KB RAM retention - extends 10-year battery life in sealed metering devices. |
| ADC | 12-bit, 1.14 Msps, 16-channel, operational down to 1.65 V - captures high-fidelity sensor data (e.g., current/voltage monitoring) under brownout conditions. |
| Crypto Engine | AES-128 hardware accelerator - offloads encryption/decryption for secure OTA firmware updates and encrypted sensor telemetry. |
| I/O Voltage Tolerance | 31 of 40 I/Os are 5V tolerant - simplifies interface with legacy 5V peripherals (e.g., RS-485 transceivers, optocouplers) without level shifters. |
| Wakeup Time | 5 µs from Flash-based Run mode - ensures rapid response to interrupts (e.g., tamper detection, pulse counting) while minimizing active time. |
Pinout & Package
STM32L081CZT6 uses a 48-pin UFQFPN package (7 × 7 mm, 0.5 mm pitch), optimized for compact PCB layouts in space-constrained modules. Pin functions align with STM32L081xx series pin compatibility across LQFP48 and UFQFPN48 variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD powers digital/analog circuits; separate VDDA ensures clean ADC reference at 1.65–3.6 V. |
| PA0–PA15, PB0–PB15 | General-purpose I/Os | 40 total I/Os; 31 support 5V tolerance - enable direct connection to industrial sensors and actuators without external buffers. |
| NRST | Active-low reset input | Internal pull-up; accepts external reset pulses ≥ 20 ns - ensures reliable recovery after brownout or ESD events. |
| BOOT0 | Boot mode selection | High at power-on selects system memory bootloader (USART/I2C/SPI) - enables field firmware recovery without debugger. |
| SWDIO / SWCLK | Serial Wire Debug interface | 2-pin debug port supporting full JTAG/SWD functionality - allows in-circuit programming and real-time trace on production boards. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power BOR | 5 selectable brownout thresholds (1.6–2.8 V) - prevents erratic operation during battery discharge without external supervisor IC. |
| RTC with calibration | 32 kHz LSE oscillator with ±1 ppm accuracy after calibration - delivers precise timekeeping for metering billing cycles over 10+ years. |
| Hardware AES-128 | Dedicated crypto engine with DMA support - achieves >10 Mbps encryption throughput while freeing CPU for sensor fusion tasks. |
| 7-channel DMA controller | Supports ADC, SPI, I2C, USART, timers, and AES - enables zero-CPU data movement (e.g., ADC → RAM → AES → USART) for continuous secure sensing. |
| Multi-speed RC oscillators | MSI (65 kHz–4.2 MHz), LSI (37 kHz), HSI16 (16 MHz ±1%) - eliminates need for external crystals in cost-sensitive designs while maintaining timing flexibility. |
Applications
| Smart Utility Metering | Wireless Sensor Node |
|---|---|
Use Scenario: Electricity/water/gas meter with metrology, tamper detection, and NB-IoT backhaul. IC Role / Device Role / Timing Role: Main MCU executing metrology algorithms, managing secure communication stack, and maintaining RTC-based billing intervals. Use Value: 0.86 µA Stop mode + RTC + full RAM retention enables accurate time-stamped event logging during mains outage without supercapacitor backup. |
Use Scenario: Battery-powered environmental monitor (temp/humidity/pressure) transmitting via BLE or LoRaWAN. IC Role / Device Role / Timing Role: System controller coordinating sensor reads, data preprocessing, radio wake/sleep, and AES-encrypted payload generation. Use Value: 0.29 µA Standby current with 3 dedicated wakeup pins allows immediate response to motion or threshold-crossing events while sustaining >10-year coin-cell life. |
| Industrial Asset Tracker | Medical Wearable Monitor |
Use Scenario: GPS-enabled logistics tracker logging location, shock, and temperature in cold-chain shipments. IC Role / Device Role / Timing Role: Central processor managing GPS fix acquisition, accelerometer interrupt handling, and secure data upload via cellular modem. Use Value: 5 µs wakeup from Flash ensures sub-millisecond latency capturing impact events, while 5V-tolerant I/Os interface directly with GPS module's 3.3 V/5 V mixed-signal outputs. |
Use Scenario: Disposable ECG patch with single-lead acquisition, motion artifact correction, and Bluetooth LE telemetry. IC Role / Device Role / Timing Role: Signal acquisition controller driving ADC, applying digital filtering, and encrypting patient data before transmission. Use Value: 12-bit ADC operating down to 1.65 V maintains SNR during battery voltage sag, and hardware AES prevents PHI leakage in untrusted radio stacks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L071CZT6 | 192 KB Flash, 20 KB SRAM, but only 2 KB EEPROM (vs. 6 KB); no AES engine | Lacks hardware encryption - unsuitable for secure firmware updates or HIPAA-compliant medical telemetry | Select when AES is unnecessary and EEPROM size requirements are ≤2 KB; lower BOM cost. |
| STM32L431CCT6 | Cortex-M4F core, 256 KB Flash, 64 KB SRAM, 2 KB EEPROM, AES-128, but higher active current (81 µA/MHz vs. 93 µA/MHz) | Higher performance and FPU support for floating-point sensor fusion, but 3× higher Stop mode current (1.2 µA vs. 0.86 µA) | Select when real-time DSP (e.g., FFT-based vibration analysis) is required and battery life >5 years is not mandatory. |
Compared with STM32L071CZT6, the STM32L081CZT6 adds critical AES-128 and 6 KB EEPROM for secure, long-term data integrity; versus STM32L431CCT6, it trades compute headroom for 30% lower Stop-mode current - making it optimal for decade-life, security-aware edge nodes.
Availability
STM32L081CZT6 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, industrial asset tracking, and medical wearable monitors requiring stable component supply across extended product lifecycles.
Supply support for STM32L081CZT6 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, and MEMS sensors for industrial, automotive, and consumer markets.
The STM32L0 series targets ultra-low-power embedded applications where battery longevity, security, and robustness in harsh environments are primary design constraints - exemplified by the STM32L081CZT6's sub-µA Stop mode and integrated AES engine.
FAQ
What is the maximum operating frequency and core type of the STM32L081CZT6?
The STM32L081CZT6 features an Arm Cortex-M0+ core with a maximum CPU frequency of 32 MHz, delivering 0.95 DMIPS/MHz. It supports dynamic voltage scaling and multiple clock sources including HSI16 (16 MHz ±1%), MSI (65 kHz–4.2 MHz), and PLL - enabling precise trade-offs between performance and power consumption in real-time applications.
Does the STM32L081CZT6 support hardware encryption, and what algorithm is implemented?
Yes, the STM32L081CZT6 integrates a dedicated hardware AES-128 encryption engine compliant with FIPS-197. It supports ECB, CBC, CTR, and GCM modes with DMA acceleration, achieving >10 Mbps throughput while offloading cryptographic operations from the CPU - essential for secure firmware updates and encrypted sensor data transmission.
How many I/O pins are 5V tolerant, and which packages support them?
31 of the 40 general-purpose I/Os on the STM32L081CZT6 are 5V tolerant, confirmed across all package variants including UFQFPN48 (CZT6), LQFP48, UFQFPN32, and LQFP32. This eliminates level-shifting components when interfacing with 5V sensors, transceivers, or legacy industrial peripherals.
What are the lowest power consumption modes and their typical currents?
The STM32L081CZT6 achieves 0.29 µA in Standby mode (with 3 wakeup pins enabled) and 0.86 µA in Stop mode with RTC and full 20 KB SRAM retention. These values are measured at 3.0 V and 25 °C per DS10888 Rev 6, enabling multi-year operation on coin-cell batteries in always-on sensing applications.
STM32L081CZT6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-LQFP
- Series:
- STM32L0
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M0+
- Core Size:
- 32-Bit Single-Core
- Speed:
- 32MHz
- Connectivity:
- I2C, IrDA, LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
- Number of I/O:
- 40
- Program Memory Size:
- 192KB (192K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 6K x 8
- RAM Size:
- 20K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.65V ~ 3.6V
- Data Converters:
- A/D 13x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L081CZT6 FAQ
1.How can I place an order for STM32L081CZT6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L081CZT6 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 STM32L081CZT6 reliable?
The price and inventory of STM32L081CZT6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L081CZT6 is usually 5 days.
3.What payment methods are accepted for STM32L081CZT6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L081CZT6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L081CZT6?
STM32L081CZT6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L081CZT6 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 STM32L081CZT6?
For technical support, including STM32L081CZT6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L081CZT6 requirements.
6.How does Aetrix verify that STM32L081CZT6 is sourced from the original manufacturer or authorized distributors?
All STM32L081CZT6 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 STM32L081CZT6 meets industry standards.
7.What is the process for return or replacement of STM32L081CZT6?
All STM32L081CZT6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L081CZT6, 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 STM32L081CZT6 part is unused and in its original packaging.
Return procedure for STM32L081CZT6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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