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STMicroelectronics STM32L151CBT6ATR
- Part No.:
- STM32L151CBT6ATR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM32L151CBT6ATR.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:5,316
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Product details
Overview
STM32L151CBT6ATR from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller featuring 128 KB Flash, 32 KB SRAM, 4 KB EEPROM with ECC, 12-bit ADC (1 Msps, 24 channels), and dual 12-bit DACs - deployed in battery-powered medical sensors, portable industrial loggers, and smart utility meters requiring sub-µA standby operation.
For engineers reviewing the STM32L151CBT6ATR datasheet, STM32L151CBT6ATR pinout, STM32L151CBT6ATR application, or STM32L151CBT6ATR equivalent, key selection criteria include verified 0.28 µA Standby current, USB 2.0 full-speed interface with internal 48 MHz PLL, 73 I/Os (5V-tolerant), LCD driver exclusion (per device variant), and -40°C to +105°C extended temperature grade.
Technical Context
This MCU implements dynamic voltage scaling and multiple low-power modes (Standby, Stop, Low-power Run) with hardware-accelerated wake-up from any mode in under 8 µs. Its memory protection unit (MPU), ECC-protected Flash/SRAM/EEPROM, and dual independent watchdogs (IWDG + WWDG) support functional safety requirements in certified embedded systems.
The analog subsystem integrates two ultra-low-power comparators with window mode and wake-up capability, a calibrated temperature sensor, VREFINT reference, and a 12-bit ADC with up to 24 external channels - all operable down to 1.8 V supply, enabling direct sensor interfacing without external signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit, up to 32 MHz - delivers 1.25 DMIPS/MHz for deterministic real-time control in resource-constrained edge nodes. |
| Memory | 128 KB Flash (ECC), 32 KB SRAM, 4 KB EEPROM (ECC) - enables robust firmware storage, data logging, and parameter retention across power cycles. |
| Power Consumption | 0.28 µA Standby (3 wakeup pins), 1.38 µA Stop + RTC - extends coin-cell battery life to >10 years in always-on sensing applications. |
| Analog Peripherals | 12-bit ADC (1 Msps, 24 ch), 2×12-bit DACs (buffered), 2×ultra-low-power comparators - supports closed-loop analog control and precision sensor readout. |
| Communication | 1×USB 2.0 FS, 3×USART (ISO 7816/IrDA), 2×SPI (16 Mbit/s), 2×I²C (SMBus/PMBus) - enables secure wired connectivity and legacy protocol interoperability. |
| Timers & Control | 10 timers: 6×16-bit GP (4×PWM/OC/IC), 2×basic, 2×watchdogs (IWDG/WWDG) - provides flexible timing, motor control, and system supervision. |
| Operating Range | 1.65 V to 3.6 V supply, -40°C to +105°C ambient - qualified for industrial and extended-temperature deployments without derating. |
Pinout & Package
LQFP48 package (7 × 7 mm, 0.5 mm pitch), 48-pin quad flat lead-free package with exposed thermal pad - optimized for compact PCB layouts and thermal management in space-constrained modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD powers core/peripherals; VSS provides low-noise return path for analog/digital sections. |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD2 | General-purpose I/O | 73 total I/Os (5V-tolerant on most); all mappable to 16 external interrupt vectors - enables flexible peripheral routing and board-level noise isolation. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; supports external reset button or supervisor IC integration for fail-safe startup. |
| BOOT0 | Boot mode selection | High at reset selects system memory bootloader (USART-based firmware update); low selects user Flash execution. |
| USB_DP / USB_DM | USB 2.0 full-speed differential pair | Integrated transceiver with internal 1.5 kΩ pull-up on DP - eliminates external USB PHY and reduces BOM count for plug-and-play connectivity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power architecture | 0.28 µA Standby (3 wakeup pins), <8 µs wake-up time - enables energy harvesting and multi-year battery operation in intermittent-sensing nodes. |
| ECC-protected memories | Flash, SRAM, and EEPROM with error correction - prevents silent data corruption in long-life industrial deployments and meets IEC 61508 SIL-2 requirements. |
| Multi-source clock system | HSI (16 MHz ±1%), LSE (32.768 kHz RTC), MSI (65 kHz–4.2 MHz), PLL (48 MHz USB) - ensures precise timing across operating modes without external crystals. |
| Capacitive touch sensing | Up to 20 channels supporting touchkey, linear, and rotary sensors - enables intuitive HMI in handheld devices without dedicated touch controller IC. |
| Programmable voltage detector (PVD) | Configurable threshold monitoring of VDD - triggers interrupt or reset before brownout, protecting firmware integrity during battery sag. |
Applications
| Wearable Health Monitor | Smart Gas Meter |
|---|---|
|
Use Scenario: Continuous ECG/PPG signal acquisition powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Primary MCU executing sensor fusion, real-time filtering, and BLE packet formatting; RTC maintains accurate timestamping between wake-ups. Use Value: 0.44 µA Stop mode + 12-bit ADC (1 Msps) enables 30-day runtime per battery charge while maintaining clinical-grade sampling fidelity. |
Use Scenario: Battery-operated ultrasonic gas flow measurement with hourly wireless reporting. IC Role / Device Role / Timing Role: System controller managing ultrasonic transducer drivers, temperature compensation, and LoRaWAN stack; PVD monitors battery health. Use Value: 1.38 µA Stop + RTC and 4 KB EEPROM allow 15-year meter lifetime with tamper-proof calibration storage and event logging. |
| Industrial Data Logger | Portable Diagnostic Tool |
|
Use Scenario: Ruggedized field instrument recording vibration, temperature, and humidity every 5 minutes. IC Role / Device Role / Timing Role: Host processor running FreeRTOS, managing SD card writes via SPI, and synchronizing multi-sensor reads using DMA-triggered ADC sequences. Use Value: 73 I/Os (5V-tolerant) interface directly with legacy 5V sensors; ECC Flash ensures firmware reliability over 100k+ power cycles. |
Use Scenario: Handheld test equipment performing impedance spectroscopy on electrochemical cells. IC Role / Device Role / Timing Role: Precision analog controller generating swept sine wave via DAC, acquiring response via ADC, and computing FFT in real time. Use Value: Dual buffered 12-bit DACs + 24-channel ADC enable simultaneous stimulus generation and high-fidelity capture - eliminating external waveform generator. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power ARM Cortex-M3 microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L051K8U6 | Lower memory (32 KB Flash, 8 KB RAM), no USB, no DAC, 12-bit ADC (1.14 Msps, 16 ch) | Suitable for simpler sensor nodes without USB or analog output needs | Select when cost and footprint are critical and USB/DAC functionality is unnecessary. |
| STM32L431CBU6 | Cortex-M4F core, 256 KB Flash, 64 KB SRAM, no EEPROM, USB OTG FS, single 12-bit DAC | Better for DSP-intensive tasks (e.g., motor control, audio preprocessing) but higher active current (80 µA/MHz) | Choose when floating-point math or higher throughput is required and power budget allows ~7× higher Run-mode consumption. |
Compared with STM32L151CBT6ATR, STM32L051K8U6 trades USB, DAC, and EEPROM for lower cost and smaller size, while STM32L431CBU6 upgrades to Cortex-M4F and larger memory at the expense of ultra-low-power efficiency - making the L151 optimal for balanced analog-rich, USB-connected, long-life applications.
Availability
STM32L151CBT6ATR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial data loggers, and portable diagnostic tools requiring stable component supply across extended product lifecycles.
Supply support for STM32L151CBT6ATR 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.
The STM32L1 series targets ultra-low-power embedded applications demanding extended battery life, robust memory integrity, and integrated analog peripherals - specifically engineered for metering, healthcare, and IoT edge nodes.
FAQ
Does STM32L151CBT6ATR support USB device mode without external crystal?
Yes. The part integrates an internal 48 MHz PLL fed by the 16 MHz HSI RC oscillator, enabling full-speed USB 2.0 device operation without an external crystal. This is confirmed in Section 3.4 (Clock management) and Table 34 (PLL characteristics) of the datasheet, where USBCLK = PLLCLK/1 is explicitly supported.
What is the maximum number of capacitive sensing channels supported?
The STM32L151CBT6ATR supports up to 20 capacitive sensing channels, compatible with touchkey, linear, and rotary touch sensor configurations. This capability is implemented via the built-in touch sensing controller (TSC) and is validated in Section 3.14 and Table 2 of the datasheet.
Is the 4 KB EEPROM truly erasable and writable during application runtime?
Yes. The 4 KB data EEPROM is organized as 128 pages of 32 bytes each and supports byte/word/quad-word erase and write operations while the CPU executes from Flash. Electrical endurance is rated at 400k cycles and data retention exceeds 20 years at 55°C - specified in Table 37 and Section 3.7 of the datasheet.
How many I/O pins are 5V tolerant, and which ones are excluded?
73 of the 83 fast I/Os are 5V tolerant, excluding only those dedicated to USB (USB_DP/USB_DM), oscillator inputs (OSC_IN/OSC_OUT), and BOOT0. Pin-by-pin tolerance is defined in Table 43 (I/O static characteristics) and Section 3.13 (Routing interface), with absolute maximum ratings confirming 5.5 V tolerance on applicable pins.
STM32L151CBT6ATR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-LQFP
- Series:
- STM32L1
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 32MHz
- Connectivity:
- I2C, IrDA, LINbus, SPI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, Cap Sense, DMA, I2S, POR, PWM, WDT
- Number of I/O:
- 37
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 4K x 8
- RAM Size:
- 32K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 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:
STM32L151CBT6ATR FAQ
1.How can I place an order for STM32L151CBT6ATR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L151CBT6ATR 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 STM32L151CBT6ATR reliable?
The price and inventory of STM32L151CBT6ATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L151CBT6ATR is usually 5 days.
3.What payment methods are accepted for STM32L151CBT6ATR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L151CBT6ATR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L151CBT6ATR?
STM32L151CBT6ATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L151CBT6ATR 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 STM32L151CBT6ATR?
For technical support, including STM32L151CBT6ATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L151CBT6ATR requirements.
6.How does Aetrix verify that STM32L151CBT6ATR is sourced from the original manufacturer or authorized distributors?
All STM32L151CBT6ATR 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 STM32L151CBT6ATR meets industry standards.
7.What is the process for return or replacement of STM32L151CBT6ATR?
All STM32L151CBT6ATR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L151CBT6ATR, 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 STM32L151CBT6ATR part is unused and in its original packaging.
Return procedure for STM32L151CBT6ATR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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