STMicroelectronics STM32L151C6U6

Overview

STM32L151C6U6 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 STM32L151C6U6 datasheet, STM32L151C6U6 pinout, STM32L151C6U6 application, or STM32L151C6U6 equivalent, key selection criteria include ultra-low-power mode timing (0.28 µA Standby), USB 2.0 full-speed support with internal 48 MHz PLL, LCD driver exclusion (per device variant), and 48-pin UFQFPN package thermal performance.

Technical Context

The STM32L151C6U6 implements dynamic voltage scaling and multiple low-power modes (Stop, Standby, Low-power Run) with hardware-accelerated wakeup (< 8 µs). Its Cortex-M3 core runs at up to 32 MHz with 1.25 DMIPS/MHz and includes a memory protection unit for secure embedded execution.

On-chip clocking 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 USB PLL generating 48 MHz from HSE or HSI - enabling precise timing control without external oscillators in many configurations.

Key Specifications

Pinout & Package

STM32L151C6U6 uses the UFQFPN48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are validated per STMicroelectronics DocID024330 Rev 5, Section 4 ("Pin descriptions") and Table 9 ("STM32L151x6/8/B-A and STM32L152x6/8/B-A pin definitions").

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051C6T6, the STM32L151C6U6 adds USB, dual DACs, and ECC memory at modest power cost; versus STM32L431CCU6, it trades FPU and Flash size for significantly lower active and standby currents - making it optimal for long-life, analog-rich, USB-configurable edge devices.

Availability

STM32L151C6U6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial data loggers, and wireless sensor nodes requiring stable component supply across multi-year production cycles.

Supply support for STM32L151C6U6 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 analog components for industrial, automotive, and consumer markets.

The STM32L1 series targets ultra-low-power embedded applications - emphasizing sub-µA standby operation, integrated analog peripherals, and ECC memory for reliability in battery-critical systems.

FAQ

Does STM32L151C6U6 include an integrated LCD controller?

No. The STM32L151C6U6 does not include an LCD driver - this feature is exclusive to STM32L152x6/8/B-A variants per ST's device summary (Table 1) and Section 3.9 of the datasheet. The 'C6' suffix denotes the base configuration without LCD support.

What is the maximum operating temperature for STM32L151C6U6?

The STM32L151C6U6 is rated for operation from –40°C to +105°C ambient temperature, as specified in the "Features" section and confirmed in Section 6.3.1 ("General operating conditions") of the official datasheet (DocID024330 Rev 5).

Can STM32L151C6U6 operate from a single 1.8 V supply?

No. The minimum VDD supply voltage is 1.65 V, but analog peripherals (ADC, DAC, comparators) require ≥1.8 V to function per Table 3 ("Functionalities depending on the operating power supply range") and Section 6.3.1. Full specification compliance requires 1.65–3.6 V, with analog features enabled only above 1.8 V.

Is the USB interface on STM32L151C6U6 compliant with USB Battery Charging v1.2?

No. The USB peripheral supports USB 2.0 Full-Speed (12 Mbps) device mode only, with internal transceiver and 48 MHz PLL - but lacks dedicated BC1.2 detection circuitry or dedicated D+/D− charging port identification logic. External ICs are required for BC1.2-compliant charging port negotiation.