STMicroelectronics STM32L151CCU6

Overview

STM32L151CCU6 from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller with 256 KB Flash, 32 KB SRAM, and 8 KB EEPROM with ECC; features USB 2.0 interface, 12-bit ADC (1 Msps, 25 channels), dual 12-bit DACs, two operational amplifiers, and LCD driver (excluded in CC variant); deployed in battery-powered medical sensors and portable industrial data loggers.

For engineers reviewing the STM32L151CCU6 datasheet, STM32L151CCU6 pinout, STM32L151CCU6 application, or STM32L151CCU6 equivalent, key selection criteria include standby current (0.29 µA), RTC-enabled Stop mode (1.4 µA), 32 MHz max CPU frequency, 70 I/Os (5V tolerant), and integrated analog peripherals operating down to 1.8 V.

Technical Context

The STM32L151CCU6 implements dynamic voltage scaling and multiple low-power modes-Standby (0.29 µA), Stop + RTC (1.4 µA), and Low-power Run (8.6 µA)-with 8 µs wakeup time from Stop. Its Cortex-M3 core runs at up to 32 MHz with 1.25 DMIPS/MHz performance and includes a memory protection unit (MPU).

Clock architecture integrates five sources: HSE (1–24 MHz), LSE (32.768 kHz RTC), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), plus a dedicated 48 MHz PLL for USB. Analog subsystem includes two rail-to-rail op-amps, two ultra-low-power comparators with window mode, and temperature sensor with calibrated output.

Key Specifications

Pinout & Package

STM32L151CCU6 is housed in a 48-pin UFQFPN package (7 × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per ST's official datasheet (DocID022799 Rev 13, Section 4).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L151CCU6, the STM32L431CCU6 trades EEPROM and analog integration for higher compute density and FPU, while the EFM32PG12B500F1024GL125 sacrifices USB and op-amps to achieve deeper sleep and native RF support-making each optimal only within distinct system architecture constraints.

Availability

STM32L151CCU6 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 multi-year production cycles.

Supply support for STM32L151CCU6 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 automotive semiconductors since 1987.

The STM32L1 series targets ultra-low-power embedded applications demanding long battery life, robust analog integration, and secure firmware execution-specifically optimized for portable medical, metering, and environmental monitoring systems.

FAQ

Does STM32L151CCU6 support USB device mode without external crystal?

Yes. The part integrates a 48 MHz PLL fed by its internal 16 MHz HSI 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 is derived from PLL output with ±0.25% tolerance meeting USB full-speed requirements.

What is the maximum number of ADC channels usable simultaneously with 1 Msps sampling?

The 12-bit ADC achieves 1 Msps only in single-channel mode. With all 25 channels enabled in sequence, the effective throughput drops to ~40 kSps per channel due to sampling capacitor settling and conversion overhead. This is specified in Table 56 (ADC characteristics) and Section 3.10, where "1 Msps" denotes maximum single-channel rate under optimal conditions (VDDA ≥ 2.4 V, ADCCLK = 14 MHz).

Can the internal op-amps drive a 10 kΩ load with rail-to-rail output swing?

Yes. Each op-amp delivers rail-to-rail output swing into loads ≥10 kΩ at VDD = 3.3 V, with typical open-loop gain >100 dB and slew rate 0.6 V/µs. These values are verified in Table 60 (Operational amplifier characteristics) and Figure 113 (Output voltage swing vs. load), confirming usability in sensor biasing and active filter stages.

Is the 8 KB EEPROM accessible concurrently with Flash program execution?

No. EEPROM and Flash share the same instruction/data bus and cannot be read/written simultaneously. During EEPROM write operations, CPU stalls until completion (typ. 3.5 ms per byte). This behavior is documented in Section 3.7 (Memories) and Table 36, where "EEPROM write time" is defined as blocking access to both memories during programming.