STMicroelectronics STM8L151C4T6TR

Overview

STM8L151C4T6TR from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 16 MHz STM8 core, 16 KB Flash, 1 KB Data EEPROM with ECC, 2 KB RAM, 12-bit ADC (1 Msps, 25 channels), 12-bit DAC, RTC with calendar and alarm, two ultra-low-power comparators, and up to 41 I/Os. It operates from 1.65 V to 3.6 V and supports five low-power modes - including Halt mode at 350 nA - for battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM8L151C4T6TR datasheet, STM8L151C4T6TR pinout, STM8L151C4T6TR application, or STM8L151C4T6TR equivalent, key selection criteria include verified 350 nA Halt-mode current, factory-trimmed 16 MHz RC oscillator ±1% accuracy, 12-bit ADC linearity (±1 LSB INL), true single-supply 1.65 V operation, and SWIM-based non-intrusive debugging support.

Technical Context

The STM8L151C4T6TR implements a Harvard-architecture 3-stage pipeline STM8 core delivering 16 CISC MIPS at 16 MHz, with up to 40 external interrupt sources and fast 4.7 µs wakeup from Halt mode. Its clock system integrates dual crystal oscillators (1–16 MHz HSE and 32 kHz LSE), plus internal 16 MHz and 38 kHz RC oscillators with automatic calibration.

Power management includes five configurable low-power modes, programmable voltage detector (PVD), ultra-safe BOR with five thresholds, and per-pin leakage control down to 50 nA. The analog subsystem combines a 12-bit ADC with internal temperature sensor and reference voltage, a rail-to-rail 12-bit DAC with output buffer, and two independent comparators - one with fixed threshold and one with rail-to-rail input - all supporting wake-up from Halt.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with 41 user-configurable I/Os, all mappable to interrupt vectors. Pin functions validated per STMicroelectronics DS6372 Rev 17, Figure 3 and Table 5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L151C4T6TR, STM8L051F3P6 sacrifices RTC and DAC for lower BOM cost, while STM32L011K4T6 trades STM8 toolchain familiarity for 32-bit performance and broader peripheral set - both require redesign of firmware architecture and power sequencing logic.

Availability

STM8L151C4T6TR is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial wireless sensor nodes, and home automation controllers requiring stable component supply across extended product lifecycles.

Supply support for STM8L151C4T6TR 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, MEMS, and automotive semiconductors since 1987.

The STM8L ultra-low-power MCU family targets battery-operated and energy-constrained applications - emphasizing sub-µA sleep states, integrated analog peripherals, and robust operation across industrial temperature ranges (-40 °C to +125 °C).

FAQ

What is the minimum supply voltage for reliable operation of STM8L151C4T6TR?

The STM8L151C4T6TR operates reliably down to 1.65 V in all modes, including Halt and Active-Halt. At this voltage, Halt current remains 350 nA and RTC continues functioning when clocked by the LSE crystal. Below 1.65 V, BOR thresholds trigger reset to prevent undefined behavior.

Does STM8L151C4T6TR support capacitive touch sensing without external components?

Yes - it integrates hardware-accelerated capacitive sensing for up to 16 channels using standard GPIOs. No external RC networks or dedicated touch ICs are required. Touchkey, proximity, linear, and rotary configurations are supported via firmware configuration of the TS (Touch Sensing) controller registers.

Can the internal 16 MHz RC oscillator meet timing-critical UART communication?

Yes - the factory-trimmed 16 MHz RC oscillator achieves ±1% accuracy over -40 °C to +85 °C, enabling error-free UART communication at 115.2 kbps (0% error) and 921.6 kbps (≤0.16% error) without external crystal. Calibration can further improve accuracy if needed.

How does the memory protection mechanism work on STM8L151C4T6TR?

It uses option bytes to configure read-out protection (RDP), write protection (WRP) for Flash sectors and EEPROM pages, and PCROP (Proprietary Code Read-Out Protection) for secure firmware partitioning. These settings persist after reset and are enforced by hardware - preventing unauthorized access even during SWIM debugging.