STMicroelectronics STM32L151C6T6ATR

Overview

STM32L151C6T6ATR 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 IoT sensors, portable medical devices, and smart utility meters requiring sub-µA standby operation.

For engineers reviewing the STM32L151C6T6ATR datasheet, STM32L151C6T6ATR pinout, STM32L151C6T6ATR application, or STM32L151C6T6ATR 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, 73 5V-tolerant I/Os with 16 external interrupt vectors, and hardware ECC for Flash and EEPROM reliability.

Technical Context

This MCU implements a memory protection unit (MPU) and dynamic voltage scaling to sustain 32 MHz CPU operation across 1.65–3.6 V supply while maintaining real-time responsiveness in low-power modes. Its clock system integrates five independent sources: HSE (1–24 MHz), LSE (32.768 kHz RTC), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), all configurable via RCC registers.

The peripheral interconnect uses AHB/APB buses with DMA support across 7 channels, enabling concurrent ADC sampling, DAC output, and USB data transfer without CPU intervention. The analog subsystem includes two ultra-low-power comparators with window mode and wake-up capability, plus temperature sensor and VREFINT for self-calibration.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), 48-pin quad flat lead-free package with exposed thermal pad - optimized for compact PCB layouts and thermal dissipation in space-constrained modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L151C6T6ATR, STM32L431CCU6 trades ultra-low-power efficiency for computational headroom and lacks EEPROM, while EFM32PG12B500F1024GL125 achieves deeper sleep but sacrifices USB and dual DAC functionality - making STM32L151C6T6ATR optimal for USB-connected, EEPROM-reliant, analog-rich edge nodes.

Availability

STM32L151C6T6ATR is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical devices, smart utility meters, and industrial asset trackers requiring stable component supply across extended product lifecycles.

Supply support for STM32L151C6T6ATR 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 - engineered specifically for battery-operated and energy-harvesting systems where microamp-level sleep currents and fast wake-up times are mandatory design requirements.

FAQ

What is the maximum operating frequency and core type of STM32L151C6T6ATR?

The STM32L151C6T6ATR features an ARM Cortex-M3 core rated for up to 32 MHz operation. It achieves 1.25 DMIPS/MHz (Dhrystone 2.1) and includes a Memory Protection Unit (MPU) for secure task isolation. The maximum frequency is sustained across the full 1.65–3.6 V supply range using dynamic voltage scaling, with factory-trimmed 16 MHz HSI oscillator accuracy of ±1%.

Does STM32L151C6T6ATR support USB communication without external components?

Yes - it integrates a full-speed USB 2.0 transceiver with internal 48 MHz PLL, eliminating the need for an external USB PHY or crystal. PA11 (D−) and PA12 (D+) are dedicated USB pins with internal pull-ups. The device supports USB device mode only (not host), and firmware must implement CDC, HID, or MSC class stacks. No external 48 MHz crystal or termination resistors are required.

How many analog-to-digital converter (ADC) channels does this MCU provide, and what is its resolution and speed?

The STM32L151C6T6ATR includes a single 12-bit ADC with up to 24 input channels (16 external, 8 internal), capable of 1 million samples per second (1 Msps). It supports single-ended and differential conversions, programmable sampling time, and hardware oversampling. Internal channels include temperature sensor and VREFINT, enabling self-calibration without external references.

What low-power modes are available, and what are their typical current consumptions?

Five low-power modes are supported: Sleep (185 µA/MHz), Low-power Run (10.9 µA), Stop (0.44 µA, 16 wakeup lines), Standby (0.28 µA, 3 wakeup pins), and Standby + RTC (1.11 µA). All modes retain RAM content except Standby. Wake-up latency is under 8 µs from Stop/Standby, and the RTC continues running in Standby + RTC mode using the 32.768 kHz LSE oscillator.