STMicroelectronics STM32L151CBT6D

Overview

STM32L151CBT6D 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 monitors, and smart utility meters requiring sub-µA standby operation.

For engineers reviewing the STM32L151CBT6D datasheet, STM32L151CBT6D pinout, STM32L151CBT6D application, or STM32L151CBT6D equivalent, key selection criteria include verified ultra-low-power mode current (0.28 µA Standby), integrated USB 2.0 PHY with internal 48 MHz PLL, LCD driver exclusion per device variant, and LQFP48 package compatibility with 48-pin footprint constraints.

Technical Context

The STM32L151CBT6D implements dynamic voltage scaling across six low-power modes (Run, Sleep, Low-power Run, Low-power Sleep, Stop, Standby), with hardware-accelerated wake-up from Stop mode in under 8 µs and RTC-backed Standby consuming just 1.11 µA. Its memory protection unit (MPU) enforces privilege separation for secure firmware execution.

Clock architecture integrates five independent sources: HSE (1–24 MHz), LSE (32.768 kHz), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), with a programmable PLL supporting CPU and USB clock generation - enabling deterministic real-time response while minimizing active power.

Key Specifications

Pinout & Package

LQFP48 package: 48-pin low-profile quad flat package, 7 × 7 mm body, 0.5 mm pitch, exposed thermal pad (EP) on underside for enhanced thermal dissipation in continuous low-power operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power ARM Cortex-M3 microcontroller applications.

Compared with STM32L151CBT6D, STM32L051K8U6 trades USB and DAC for lower cost and power in minimal-feature designs, while STM32L431RCT6 offers higher compute density at the expense of standby current and integrated EEPROM - making STM32L151CBT6D optimal for balanced ultra-low-power systems needing USB, DAC, and persistent calibrated storage.

Availability

STM32L151CBT6D is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic tools requiring stable component supply across extended product lifecycles.

Supply support for STM32L151CBT6D 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 products for industrial, automotive, and consumer markets.

The STM32L1 series targets ultra-low-power embedded applications where battery longevity, mixed-signal integration, and certified functional safety (IEC 61508 SIL2) are critical - emphasizing ECC memory, calibrated peripherals, and validated low-power mode transitions.

FAQ

Does STM32L151CBT6D include an integrated LCD controller?

No. The STM32L151CBT6D explicitly excludes the LCD driver found in STM32L152 variants. This is confirmed in Section 2.1 ("Device overview") and Table 1 of the datasheet, which states "LCD Driver (except STM32L151x6/8/B-A devices)". Designers requiring display support must select an STM32L152 part or add an external LCD controller.

What is the maximum allowed operating temperature for STM32L151CBT6D?

The STM32L151CBT6D is rated for operation from –40°C to +105°C ambient temperature, as specified in the "Features" section and Section 6.3.1 ("General operating conditions") of the datasheet. This extended range supports deployment in industrial enclosures and outdoor metering equipment without forced cooling.

Can the internal 16 MHz RC oscillator be used as the system clock source without calibration?

Yes. The high-speed internal (HSI) RC oscillator is factory-trimmed to ±1% accuracy at 16 MHz and may be used directly as the system clock source. However, for USB or precise timing applications, the datasheet recommends using the PLL with HSE or trimming HSI via the RCC_HSICALIBR register to achieve tighter tolerance.

How many I/O pins on STM32L151CBT6D are 5V-tolerant?

73 of the 83 fast I/O pins are 5V-tolerant, as stated in the "Features" section and confirmed in Section 6.3.13 ("I/O port characteristics"). This allows direct interfacing with legacy 5V logic, RS-232 level shifters, or industrial sensors without external voltage translators - simplifying design and reducing component count.