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STMicroelectronics STM32L151CBT6TR
- Part No.:
- STM32L151CBT6TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM32L151CBT6TR.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,300
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Product details
Overview
STM32L151CBT6TR 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 IoT sensors, portable medical monitors, and smart utility meters requiring sub-µA standby operation.
For engineers reviewing the STM32L151CBT6TR datasheet, STM32L151CBT6TR pinout, STM32L151CBT6TR application, or STM32L151CBT6TR equivalent, key selection criteria include ultra-low-power mode timing (0.28 µA Standby), integrated USB 2.0 PHY with internal 48 MHz PLL, capacitive touch sensing support (up to 20 channels), and 73 5V-tolerant I/Os with 16 external interrupt vectors.
Technical Context
The STM32L151CBT6TR implements a dual-voltage domain architecture with VDD/VDDA (1.65–3.6 V) and optional VLCD rail, enabling simultaneous analog precision and low-power digital execution. Its Cortex-M3 core operates up to 32 MHz with dynamic voltage scaling and includes a memory protection unit (MPU) for secure task isolation.
Power management integrates five BOR thresholds, programmable voltage detector (PVD), and multiple low-power modes - including Stop mode with RTC (1.38 µA) and Standby mode with 3 wakeup pins (0.28 µA) - all validated across -40°C to +105°C industrial temperature range.
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 (with ECC), 32 KB SRAM, 4 KB true EEPROM (with ECC) - enables robust firmware storage, runtime data logging, and parameter retention without external components. |
| ADC | 12-bit, 1 Msps, 24-channel SAR ADC - supports high-resolution sensor acquisition (e.g., thermistors, strain gauges) with internal reference and temperature sensor. |
| DAC | Two 12-bit buffered DACs - provide precise analog output for calibration signals, bias generation, or audio waveform synthesis in portable devices. |
| Low-Power Modes | 0.28 µA Standby (3 wakeup pins), 1.38 µA Stop + RTC - extends coin-cell battery life to >10 years in always-on monitoring applications. |
| USB Interface | Full-speed USB 2.0 with integrated PHY and 48 MHz PLL - eliminates need for external clock crystal or transceiver in host/peripheral designs. |
| I/O Count | 48-pin LQFP package with 37 I/Os (73 total available on larger variants; 37 mapped here) - 5V-tolerant inputs simplify level-shifting in mixed-voltage systems. |
Pinout & Package
LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad - optimized for compact PCB layouts and thermal dissipation in space-constrained wearable and metering designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA | Core & Analog Power Supply | 1.65–3.6 V input; separate VDDA ensures clean analog reference for ADC/DAC accuracy down to 1.8 V operation. |
| VSS, VSSA | Digital & Analog Ground | Separate ground planes reduce noise coupling between digital switching and sensitive analog conversions. |
| PA0–PA15, PB0–PB15, PC0–PC15 | General-purpose I/O | 37 GPIOs in LQFP48; all mappable to 16 external interrupt lines - enables flexible button, LED, and sensor interface routing. |
| PA1, PA2, PA3 | USART2 TX/RX/CTS | Hardware UART with ISO 7816 and IrDA support - suitable for secure element communication or IR remote control interfaces. |
| PA11, PA12 | USB_DM / USB_DP | Dedicated full-speed USB differential pair with internal pull-ups - requires no external transceiver or crystal for basic device enumeration. |
| PC13–PC15 | RTC oscillator inputs | Supports 32.768 kHz crystal with calibration - maintains accurate timekeeping during Stop/Standby modes with <1.5 ppm drift over temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power standby | 0.28 µA with 3 wakeup pins - enables immediate system wake on external event without polling overhead or power penalty. |
| Capacitive touch sensing | 20-channel CTSU supporting touchkey, linear, and rotary sensors - eliminates mechanical buttons and reduces BOM cost in HMI designs. |
| Embedded EEPROM | 4 KB true EEPROM with ECC - stores calibration data, device IDs, or usage counters with guaranteed 100k write cycles and 20-year data retention. |
| Dual 12-bit DACs | Buffered outputs with independent triggers - generate synchronized analog waveforms for sensor excitation or feedback control loops. |
| Programmable voltage detector | Configurable threshold detection (4 levels) - provides early warning of brownout conditions before system reset, enabling graceful shutdown. |
Applications
| Smart Utility Meter | Portable ECG Monitor |
|---|---|
Use Scenario: Battery-powered electricity/water/gas meter with hourly pulse counting, tamper detection, and RF upload. IC Role / Device Role / Timing Role: Main system controller managing metrology ADC sampling, LCD display refresh, real-time billing timestamping, and low-power RF wake-up coordination. Use Value: 0.28 µA Standby current enables >15-year coin-cell operation; integrated EEPROM securely stores tariff tables and consumption history without external memory. |
Use Scenario: Handheld single-lead ECG device with analog front-end, real-time QRS detection, and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Signal processor acquiring 12-bit ECG samples at 1 kSPS, executing FIR filtering, detecting R-peaks via comparator window mode, and buffering data for wireless upload. Use Value: Dual 12-bit DACs calibrate front-end gain stages; ultra-low-power Stop mode with RTC allows scheduled 5-minute measurement bursts while preserving battery for >7 days. |
| Industrial Wireless Sensor Node | Smart Thermostat Display |
Use Scenario: LoRaWAN-enabled temperature/humidity/pressure node deployed in HVAC ducts or factory floors. IC Role / Device Role / Timing Role: Sensor hub aggregating I²C/BME280 data, performing dew-point calculation, scheduling periodic LoRa transmissions, and managing deep-sleep cycles. Use Value: 73 5V-tolerant I/Os simplify connection to legacy industrial sensors; 10 nA I/O leakage prevents false triggering in high-impedance sensor circuits. |
Use Scenario: Battery-operated wall-mounted thermostat with capacitive touch keys, segment LCD, ambient light sensing, and Zigbee connectivity. IC Role / Device Role / Timing Role: Human interface controller driving 8×40-segment LCD (via external driver), scanning 5-key touchpad, adjusting contrast dynamically, and managing backlight PWM. Use Value: Integrated touch sensing engine offloads CPU during continuous key monitoring; <8 µs wakeup time ensures instantaneous response to user interaction. |
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 |
|---|---|---|---|
| STM32L431CBT6 | ARM Cortex-M4F core, 200 µA/MHz Run, no EEPROM, higher performance but 2.5× higher active current | Better for DSP-intensive tasks (e.g., FFT-based vibration analysis); unsuitable where EEPROM-based calibration persistence is mandatory | Select when floating-point math or higher clock throughput outweighs EEPROM dependency and lowest standby power. |
| EFM32PG12B500F1024GL125 | ARM Cortex-M4, 1.4 µA Stop mode (no RTC), 8 kB RAM, no USB, proprietary energy mode sequencing | Optimized for sub-GHz RF SoC integration (e.g., with Si446x); lacks native USB and LCD support required for wired diagnostics or display | Prefer for RF-centric, non-USB field devices where ecosystem tooling (Simplicity Studio) and proprietary low-energy peripherals are prioritized. |
Compared with STM32L151CBT6TR, STM32L431CBT6 trades EEPROM and ultra-low standby for DSP capability and higher clock speed, while EFM32PG12B500F1024GL125 offers deeper RF integration but sacrifices USB, LCD, and EEPROM - making STM32L151CBT6TR uniquely balanced for mixed-signal, display-enabled, battery-critical applications.
Availability
STM32L151CBT6TR is available at Aetrix Electronics and suitable for smart utility meters, portable medical monitors, industrial wireless sensor nodes, and smart thermostat displays requiring stable component supply across extended product lifecycles.
Supply support for STM32L151CBT6TR 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 ICs, sensors, and automotive semiconductors since 1987.
The STM32L1 series targets ultra-low-power embedded applications - specifically engineered for battery-operated devices demanding multi-year runtime, robust analog integration, and industrial-grade reliability from -40°C to +105°C.
FAQ
Does STM32L151CBT6TR support USB device mode without an external crystal?
Yes. The part integrates a 48 MHz PLL fed by its internal 16 MHz HSI RC oscillator, enabling full-speed USB device operation without an external crystal. This is confirmed in Section 3.4 (Clock management) and Table 34 (PLL characteristics) of the datasheet, where USB clock generation is explicitly supported via HSI+PLL path.
What is the maximum number of capacitive sensing channels usable in LQFP48 package?
The STM32L151CBT6TR supports up to 20 capacitive sensing channels, but only 16 are physically accessible in the LQFP48 package due to pin count limitations. Pins TSC_G1_IO1 through TSC_G4_IO4 and TSC_G5_IO1 through TSC_G6_IO4 are routed to dedicated TSC I/Os per Table 9 (pin definitions) and Section 3.14 (Touch sensing).
Is the 4 KB EEPROM truly standalone or emulated in Flash?
It is true hardware EEPROM - not Flash-emulated - with dedicated circuitry, ECC protection, 100k write endurance, and 20-year data retention at 85°C. This is specified in Section 3.7 (Memories) and Table 36/37 (Flash and EEPROM characteristics), distinguishing it from software-emulated EEPROM solutions.
Can the 12-bit ADC operate reliably below 2.0 V supply?
Yes. The ADC functions down to 1.8 V VDDA, with guaranteed 12-bit linearity and 1 Msps sampling rate per Section 3.10 and Table 55 (ADC characteristics). Internal VREFINT (1.22 V ±2%) remains stable across the full 1.65–3.6 V VDD range, ensuring consistent conversion accuracy.
STM32L151CBT6TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-LQFP
- Series:
- STM32L1
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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:
- 16K 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:
STM32L151CBT6TR FAQ
1.How can I place an order for STM32L151CBT6TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L151CBT6TR 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 STM32L151CBT6TR reliable?
The price and inventory of STM32L151CBT6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L151CBT6TR is usually 5 days.
3.What payment methods are accepted for STM32L151CBT6TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L151CBT6TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L151CBT6TR?
STM32L151CBT6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L151CBT6TR 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 STM32L151CBT6TR?
For technical support, including STM32L151CBT6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L151CBT6TR requirements.
6.How does Aetrix verify that STM32L151CBT6TR is sourced from the original manufacturer or authorized distributors?
All STM32L151CBT6TR 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 STM32L151CBT6TR meets industry standards.
7.What is the process for return or replacement of STM32L151CBT6TR?
All STM32L151CBT6TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L151CBT6TR, 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 STM32L151CBT6TR part is unused and in its original packaging.
Return procedure for STM32L151CBT6TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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