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STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48
STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48
STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48
STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48
STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48
STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48
STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48
STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48
STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48
STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48
STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48
STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48
STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48
STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48
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STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48

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STM32L151CCU6 Product Overview

STM32L151CCU6 is an Arm Cortex-M3 MCU at 32 MHz, UFQFPN-48. The STM32L151CCU6 features 256 KB Flash, 32 KB SRAM, 8 KB EEPROM, 12-bit ADC (14 ch), two 12-bit DACs, two comparators, capacitive touch channels, LP timers, RTC, 3×USART, 2×SPI, 2×I2C. The STM32L151CCU6 offers up to 37 x 5 V-tolerant I/Os and operates from 1.8–3.6 V, -40–85 °C. Compared to the LQFP-48 STM32L151CCT6, the STM32L151CCU6 uses an ultra-compact UFQFPN-48 package, saving PCB space while retaining the same powerful 256 KB Flash, 32 KB SRAM, and rich analog peripherals, making the STM32L151CCU6 a top-tier ultra-low-power platform for space-constrained battery-powered sensors, portable meters, and industrial measurement applications.


STM32L151CCU6 Core Features

Core: The STM32L151CCU6 features an Arm Cortex-M3 core at 32 MHz, with low-power design

Memory: The STM32L151CCU6 provides 256 KB Flash, 32 KB SRAM, and 8 KB EEPROM

Analog: The STM32L151CCU6 includes a 12-bit ADC (14 ch), 2×12-bit DACs, 2×Comparators, and capacitive touch

Connectivity: The STM32L151CCU6 supports 3×USART, 2×SPI, and 2×I2C

Timers: The STM32L151CCU6 features LP Timer, GP Timers, and RTC

I/Os: The STM32L151CCU6 provides 37 (5 V-tolerant)

Package: The STM32L151CCU6 comes in UFQFPN-48

Temperature Range: The STM32L151CCU6 operates from -40°C to 85°C


STM32L151CCU6 Applications

Battery-Powered Sensors: The STM32L151CCU6 excels in wireless sensor nodes needing complex data processing and large code space

Portable Devices: The STM32L151CCU6 is ideal for high-performance wearables and portable medical devices

Industrial Metering: The STM32L151CCU6 is used in water, gas, and electricity meters

Consumer Electronics: The STM32L151CCU6 supports advanced remote controls, e-labels, and smart cards

Energy Harvesting Applications: The STM32L151CCU6 is suitable for self-powered sensor nodes and energy harvesting systems


STM32L151CCU6 Key Advantages

256 KB Flash + 32 KB SRAM: The STM32L151CCU6's top-tier storage comfortably handles complex algorithms and protocol stacks

Dual DACs & Comparators: The STM32L151CCU6 offers flexible analog output and signal threshold detection without external chips

Capacitive Touch Sensing: The STM32L151CCU6 easily implements touch buttons and sliders for enhanced HMI

8 KB EEPROM: The STM32L151CCU6 provides more generous data storage for safely preserving critical parameters

Ultra-Compact UFQFPN-48 Package: The STM32L151CCU6 dramatically reduces PCB area while retaining all 37 I/Os

Cortex-M3 Ultra-Low Power: The STM32L151CCU6 achieves a perfect balance of excellent processing and long battery life

5 V-tolerant I/Os: The STM32L151CCU6's enhanced noise immunity simplifies external circuit design

Full Ecosystem Compatibility: The STM32L151CCU6 ensures easy development with STM32CubeIDE/HAL/LL libraries


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STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48STM32L151CCU6 ST Mainstream Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator Capacitive Touch UFQFPN-48 STM32L151CCU6 ST Arm Cortex-M3 Ultra-Low-Power 32-bit MCU 256KB Flash 32KB SRAM EEPROM Dual DAC Comparator UFQFPN-48





FAQ

1. What is STM32L151CCU6?
The STM32L151CCU6 is an ultra-low-power 32-bit MCU from STMicroelectronics' STM32L1 series, based on an Arm® Cortex®-M3 core in a UFQFPN-48 package (7 mm × 7 mm). Running at up to 32 MHz, the STM32L151CCU6 provides 256 KB Flash and 32 KB SRAM, along with a 12-bit ADC, 12-bit DAC, capacitive touch sensing (TSC), and a USB device interface. In an extremely compact 48‑pin QFN package, the STM32L151CCU6 offers a highly integrated single‑chip solution for space‑constrained, battery‑powered devices that need rich analog features and USB communication without a segment display.

2. What are the key specifications of STM32L151CCU6?

  • Core: The STM32L151CCU6 features an Arm® Cortex®-M3 core, up to 32 MHz, 1.25 DMIPS/MHz

  • Memory: The STM32L151CCU6 provides 256 KB Flash and 32 KB SRAM

  • Operating Voltage: The STM32L151CCU6 operates from 1.65 V to 3.6 V

  • Temperature Range: The STM32L151CCU6 covers -40 °C to +85 °C (industrial grade)

  • I/O Count: The STM32L151CCU6 provides up to 37

  • Package: The STM32L151CCU6 comes in UFQFPN-48 (7 mm × 7 mm)

3. How does STM32L151CCU6 differ from STM32L152CCU6? Why doesn't it have a segment LCD driver?
This reflects the core positioning of the two product lines: the STM32L151CCU6 omits the segment LCD driver, focusing on essential peripherals such as ADC, DAC, USB, and touch sensing at a lower cost. The L152 series additionally integrates a segment LCD controller for applications needing a segment display. If your design uses an OLED, TFT, or no local display, the STM32L151CCU6 delivers identical processing performance and analog capabilities in a compact package at a more cost‑effective price.

4. What kind of applications can the STM32L151CCU6's 256 KB Flash and 32 KB SRAM combination support? Is it sufficient?
The STM32L151CCU6's 256 KB Flash comfortably accommodates a lightweight RTOS (e.g., FreeRTOS), USB device stacks (CDC/HID), and typical sensor drivers and control algorithms. The STM32L151CCU6's 32 KB SRAM requires careful planning—use static memory allocation, compact task stacks, and DMA to handle background data transfers. This memory configuration is well‑suited for relatively fixed‑function devices such as wearable medical patches, wireless sensor nodes, USB dongles, and compact industrial data loggers.

5. What can the built‑in 12‑bit DAC of the STM32L151CCU6 do? Can it output analog signals directly?
The STM32L151CCU6 provides two independent 12‑bit DAC channels capable of outputting 0–3.3 V DC levels. With DMA, the STM32L151CCU6 can generate smooth low‑frequency arbitrary waveforms, commonly used to produce control voltages for 4–20 mA transmitters, supply programmable excitation to external sensors, or drive analog panel meters. This integrated capability eliminates the need for an external DAC chip, making the STM32L151CCU6 highly practical in handheld and portable devices requiring analog outputs.

6. How does the STM32L151CCU6 perform in terms of low power consumption? What are the typical currents in different modes?

  • Temperature Range: The STM32L151CCU6 operates from -40 °C to +85 °C

  • Ultra‑low‑power modes of the STM32L151CCU6:

    • Standby mode: ~0.3 µA (no RTC) for the STM32L151CCU6

    • Stop mode: ~0.5 µA (no RTC), ~1.3 µA with RTC for the STM32L151CCU6

    • Low‑power Run mode: ~10 µA/MHz for the STM32L151CCU6

    • Run mode: ~230 µA/MHz for the STM32L151CCU6

7. How does the capacitive touch sensing (TSC) work on the STM32L151CCU6? Is an external touch IC required?
No external touch IC is needed for the STM32L151CCU6. The TSC controller uses standard GPIOs and copper pads on the PCB as sensing electrodes, supporting up to 24 channels on the STM32L151CCU6. Based on the charge‑transfer principle, the STM32L151CCU6 provides robust touch detection with good moisture and noise immunity. ST provides a ready‑to‑use software library for the STM32L151CCU6; you simply design the touch‑pad geometry and call the API, significantly reducing BOM cost.

8. Can the USB device interface of the STM32L151CCU6 emulate a serial port or a flash drive? What are the clock requirements?
The STM32L151CCU6's on‑chip USB 2.0 full‑speed device controller can be configured as a CDC virtual COM port, an HID device, or an MSC mass storage device. USB communication demands extremely tight clock accuracy (≤0.25% tolerance), so an external 8 MHz or 16 MHz high‑precision crystal is mandatory for the STM32L151CCU6. The internal RC oscillator alone cannot guarantee stable USB operation, making the external crystal essential for the STM32L151CCU6.

9. What can I do if 32 KB SRAM on the STM32L151CCU6 turns out to be insufficient later in the project?
First, optimize firmware to free up memory—disable unused protocol stack modules, adopt more compact data structures, and increase DMA usage on the STM32L151CCU6. If additional SRAM is still needed, you can add an external SPI or parallel SRAM/PSRAM, or upgrade to the pin‑compatible STM32L151RET6 (512 KB Flash / 80 KB SRAM), which offers more generous storage in the same package footprint as the STM32L151CCU6.

10. What peripheral changes should I be aware of when migrating from the STM32L151CCU6 to the STM32L4 series?
The L4 series upgrades to a Cortex®‑M4 core (with FPU and DSP) at up to 80 MHz, delivering a significant computing boost compared to the STM32L151CCU6. However, most L4 devices no longer integrate a DAC or segment LCD driver, and the capacitive touch module may differ. If your product heavily relies on DAC analog output and touch sensing, the STM32L151CCU6 remains a mature and cost‑effective choice. For future designs that need more complex algorithms or color TFT displays, migrating to the L4 series is straightforward, with high HAL code reusability from the STM32L151CCU6—but the analog and display circuitry will need to be redesigned.

Property:
Specification
Product Type:
Arm Cortex-M3 Ultra-Low-Power 32-bit MCU
Brand:
STMicroelectronics
Core:
Cortex-M3 32 MHz
Package:
UFQFPN-48
Memory:
256 KB Flash, 32 KB SRAM, 8 KB EEPROM
Analog:
12-bit ADC, 2×12-bit DACs, 2×Comparators, Capacitive Touch
Connectivity:
USART, SPI, I2C
I/Os:
37
Voltage:
1.8V–3.6V
Temperature:
-40°C to 85°C
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