STMicroelectronics STM32L151RCT6A

Overview

STM32L151RCT6A from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M3 microcontroller featuring 256 KB Flash, 32 KB SRAM, 8 KB EEPROM with ECC, 12-bit ADC (1 Msps, up to 40 channels), and dual 12-bit DACs with output buffers. It operates from 1.65 V to 3.6 V across –40°C to +105°C and targets battery-powered IoT sensors, portable medical devices, and smart metering endpoints requiring sub-µA stop mode (0.475 µA) and fast 8 µs wakeup.

For engineers reviewing the STM32L151RCT6A datasheet, STM32L151RCT6A pinout, STM32L151RCT6A application, or STM32L151RCT6A equivalent, key selection criteria include verified ultra-low-power mode current consumption (e.g., 0.475 µA stop mode), integrated analog peripherals (dual DACs, 2 op-amps, 2 comparators), LCD driver exclusion (confirmed for RCT6A variant), USB 2.0 full-speed support with internal 48 MHz PLL, and LQFP64 package compatibility with 5V-tolerant I/Os.

Technical Context

The STM32L151RCT6A implements dynamic voltage scaling and multiple low-power modes (Stop, Standby, Low-power Run) governed by an ultrasafe BOR with five thresholds and programmable voltage detector (PVD). Its clock system integrates a 16 MHz HSI RC (+/−1%), 32 kHz LSE for RTC calibration, and a PLL supporting both CPU and USB 48 MHz clocks.

Analog subsystem includes two rail-to-rail operational amplifiers, a 12-bit ADC with hardware oversampling and temperature sensor, dual buffered 12-bit DACs, and two ultra-low-power comparators with window mode and wake-up capability - all functional down to 1.8 V supply.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant, with exposed thermal pad. Pin count: 64 terminals; 51 general-purpose I/Os (49 5V-tolerant), including dedicated SWD/JTAG debug pins (PA13/PA14), USB D+/D−, and multiple alternate-function remappable signals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power ARM Cortex-M3 microcontroller applications.

Compared with STM32L152RCT6, the STM32L151RCT6A removes LCD circuitry to reduce cost and static power, while retaining identical analog and communication peripherals; versus STM32L431RCT6, it trades DSP capability for lower active/standby current and integrated op-amps - making it optimal for battery-constrained analog-centric designs.

Availability

STM32L151RCT6A is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, and industrial wireless sensor nodes requiring stable component supply across multi-year production cycles.

Supply support for STM32L151RCT6A 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 products for industrial, automotive, and consumer markets.

The STM32L1 series targets ultra-low-power embedded applications, emphasizing sub-µA sleep modes, integrated analog peripherals, and ECC-protected memories for long-life, maintenance-free operation in energy-constrained systems.

FAQ

Does STM32L151RCT6A support USB device mode without external PHY?

Yes. The STM32L151RCT6A integrates a full-speed USB 2.0 transceiver with internal pull-up resistors and 48 MHz PLL clock generation. It supports USB device mode (HID, CDC, MSC) directly via PA11 (DM) and PA12 (DP) pins - no external PHY or crystal required beyond the standard 32.768 kHz LSE for RTC synchronization.

What is the maximum number of ADC channels usable simultaneously with hardware oversampling?

The 12-bit ADC supports hardware oversampling up to 8× on any single channel, improving effective resolution to 14 bits. Simultaneous sampling across multiple channels is not supported in oversampled mode; however, up to 40 channels can be scanned sequentially in regular or injected group mode at 1 Msps aggregate rate, with configurable sampling time per channel.

Is the 8 KB EEPROM truly wear-levelled and endurance-rated?

Yes. The 8 KB true EEPROM is implemented in dedicated Flash memory with built-in wear leveling and error correction (ECC). ST specifies 400,000 write/erase cycles and 20-year data retention at 55°C - validated per JEDEC standards and documented in Section 6.3.9 of DS10262 Rev 8.

Can the two operational amplifiers be configured as instrumentation amplifiers?

No. The two rail-to-rail op-amps are standalone units with fixed gain configurations (non-inverting only) and no internal resistor network for instrumentation amplifier topology. They support unity-gain buffer, voltage follower, or external feedback networks - but achieving high CMRR requires discrete external resistors and careful layout, not integrated IA functionality.