Item specifics
Description
STM32L151C8T6 Product Overview
The STM32L151C8T6 is an Arm Cortex-M3 MCU at 32 MHz, LQFP-48. 64 KB Flash, 10 KB SRAM, 4 KB EEPROM, 12-bit ADC (16 ch), 12-bit DAC, two comparators, capacitive touch channels, LP timers, RTC, 3×USART, 2×SPI, 2×I2C. Up to 37 x 5 V-tolerant I/Os. 1.8–3.6 V, -40–85 °C. Compared to the STM32L152C8T6 (with LCD driver), the STM32L151C8T6 omits the segment display while retaining the same outstanding ultra-low-power performance and rich analog peripherals, making it a highly competitive low-power platform for battery-powered sensors, portable meters, and industrial measurement applications that do not require a display.
STM32L151C8T6 Core Features
Core: The STM32L151C8T6 features an Arm Cortex-M3 core at 32 MHz with low-power design.
Memory: The STM32L151C8T6 provides 64 KB Flash, 10 KB SRAM, and 4 KB EEPROM.
Analog: The STM32L151C8T6 integrates a 12-bit ADC (16 channels), a 12-bit DAC, two comparators, and capacitive touch sensing.
Connectivity: The STM32L151C8T6 includes 3×USART, 2×SPI, and 2×I2C interfaces.
Timers: The STM32L151C8T6 features LP timers, general-purpose timers, and an RTC.
I/Os: The STM32L151C8T6 offers 37 I/O pins, all 5 V-tolerant.
Package: The STM32L151C8T6 comes in an LQFP-48 package.
Temperature Range: The STM32L151C8T6 operates over a temperature range of -40°C to 85°C.
STM32L151C8T6 Applications
Battery-Powered Sensors: The STM32L151C8T6 is ideal for IoT wireless sensors and environmental monitoring nodes.
Portable Devices: The STM32L151C8T6 is suitable for wearables and portable medical devices.
Industrial Metering: The STM32L151C8T6 enables water, gas, and electricity meter applications.
Consumer Electronics: The STM32L151C8T6 can be used in remote controls, e-labels, and smart cards.
Energy Harvesting Applications: The STM32L151C8T6 supports self-powered sensor nodes and energy harvesting systems.
STM32L151C8T6 Key Advantages
Cortex-M3 Core + Ultra-Low Power: The STM32L151C8T6's Cortex-M3 core delivers stronger processing capability than M0+ while maintaining extremely low power consumption.
On-Chip DAC & Comparators: The STM32L151C8T6 provides analog output and signal threshold detection without external components.
Capacitive Touch Sensing: The STM32L151C8T6 enables easy implementation of touch buttons and sliders for enhanced HMI.
4 KB EEPROM: The STM32L151C8T6's on-chip 4 KB EEPROM safely stores critical configuration parameters and operational data.
5 V-tolerant I/Os: The STM32L151C8T6's 5 V-tolerant I/Os enhance system noise immunity and simplify external level-shifting circuitry.
Full Ecosystem Compatibility: The STM32L151C8T6 is fully compatible with STM32CubeIDE/HAL/LL libraries for easy development.
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FAQ
1. What is STM32L151C8T6?
The STM32L151C8T6 is an ultra-low-power 32-bit MCU from STMicroelectronics' STM32L1 series, based on an Arm® Cortex®-M3 core in an LQFP-48 package (7 mm × 7 mm). Running at up to 32 MHz, the STM32L151C8T6 offers 128 KB Flash and 32 KB SRAM, along with a 12-bit ADC, 12-bit DAC, capacitive touch sensing (TSC), and a USB device interface. Without a segment LCD driver, the STM32L151C8T6 concentrates on core analog features, USB connectivity, and touch interaction, providing a compact, easy‑to‑solder, and cost‑competitive solution for battery‑powered devices with moderate storage requirements.
2. What are the key specifications of STM32L151C8T6?
Core: Arm® Cortex®-M3, up to 32 MHz, 1.25 DMIPS/MHz
Memory: 128 KB Flash, 32 KB SRAM
Operating Voltage: 1.65 V to 3.6 V
Temperature Range: -40 °C to +85 °C (industrial grade)
I/O Count: up to 37
Package: LQFP-48 (7 mm × 7 mm)
3. Is the LQFP-48 package easy to solder? Is it suitable for hobbyists and small teams?
Very easy. The LQFP-48 has all pins exposed with a 0.5 mm pitch and can be drag‑soldered with a standard iron and flux—no hot‑air station required. This greatly lowers the barrier for prototyping and small‑batch production, making the STM32L151C8T6 an excellent choice for hobbyists, makers, and small teams. The 7 mm × 7 mm size offers a good balance between compactness and manual handling.
4. What applications is STM32L151C8T6 suitable for?
With 128 KB Flash, a USB device interface, a DAC, and capacitive touch sensing, the STM32L151C8T6 is ideal for cost‑sensitive battery‑powered devices that do not require a segment display. Typical applications include portable medical accessories, wireless sensor nodes, USB dongles, industrial handheld data loggers, and compact IoT endpoints needing local analog output and touch keys.
5. What development tools are needed? Is there a compatible development board?
ST provides free STM32CubeMX for graphical configuration and STM32CubeIDE as an integrated development environment, along with the STM32CubeL1 firmware library. Debugging and programming are handled by ST‑Link debuggers. The NUCLEO‑L152RE board can serve as a rapid prototyping platform—though it carries an L152 chip, the peripheral architecture is highly compatible, and code can be easily ported to the STM32L151C8T6 with minor adjustments.
6. How does it perform in terms of low power consumption? What are the typical currents across its modes?
Temperature Range: -40 °C to +85 °C
Ultra‑low‑power modes of the STM32L151C8T6:
Standby mode: ~0.3 µA (no RTC)
Stop mode: ~0.5 µA (no RTC), ~1.3 µA with RTC
Low‑power Run mode: ~10 µA/MHz
Run mode: ~230 µA/MHz
7. What is the main difference between this and the STM32L152 series? Why doesn't it have a segment LCD driver?
This is the core distinction between the L151 and L152 lines: the STM32L151C8T6 omits the segment LCD driver entirely to achieve lower cost and power consumption. If your application does not need a segment display, the STM32L151C8T6 is the more economical choice; if you require a segment display (e.g., for water meters, gas meters, thermostat panels), the L152 with its built‑in LCD driver is the correct choice. All other peripherals are virtually identical.
8. Is 32 KB SRAM enough to run a USB stack? Won't it run out of memory?
The STM32L151C8T6's 32 KB SRAM can support a lightweight RTOS (e.g., FreeRTOS) and standard USB device libraries (such as CDC virtual COM port or HID keyboard/mouse) with careful memory management. Use static allocation, minimize task stack sizes, strip unused stack modules, and leverage DMA to offload background data transfers. If your application needs larger data buffers, consider upgrading to a variant with more SRAM, such as the STM32L151RET6 (80 KB SRAM).
9. Can the USB device interface emulate a serial port or a flash drive? Why must an external crystal be used?
The STM32L151C8T6'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. However, USB communication demands extremely tight clock accuracy (≤0.25% tolerance), which the internal RC oscillator cannot meet. An external 8 MHz or 16 MHz high‑precision crystal is mandatory to ensure stable connectivity and reliable data transfer with the STM32L151C8T6.
10. If I need more storage later, how can I upgrade? Will the hardware need changes?
You can upgrade the STM32L151C8T6 to the pin‑compatible STM32L151CCT6 (256 KB Flash / 32 KB SRAM) or STM32L151RET6 (512 KB Flash / 80 KB SRAM)—the latter uses an LQFP‑64 package, so a compatible PCB footprint must be designed in advance for a seamless swap. All STM32L1 devices share the same STM32Cube ecosystem, allowing extensive HAL code reuse and minimal migration effort.