STMicroelectronics STM8L151C8T7

Overview

STM8L151C8T7 from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 64 KB Flash, 2 KB data EEPROM, RTC with ±0.5 ppm accuracy, 12-bit ADC (1 Msps, 28 channels), dual 12-bit DACs, and LCD controller supporting 8×40 segments - deployed in battery-powered smart meters, portable medical sensors, and industrial IoT edge nodes requiring sub-µA sleep current.

For engineers reviewing the STM8L151C8T7 datasheet, STM8L151C8T7 pinout, STM8L151C8T7 application, or STM8L151C8T7 equivalent, key selection criteria include active-halt mode current (1.4 µA), fast wake-up time (4.7 µs), 67 GPIOs with capacitive touch support, and LQFP48 package compatibility for space-constrained designs.

Technical Context

The STM8L151C8T7 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. It integrates dual clock domains: high-speed (1–16 MHz HSE/16 MHz HSI) and low-power (32 kHz LSE/38 kHz LSI), managed by a Clock Security System to detect oscillator failure.

Its power architecture supports five distinct low-power modes - including Active-halt with full RTC operation and 400 nA Halt - enabled by programmable BOR thresholds, PVD, and per-pin leakage control (50 nA/I/O). The RTC includes BCD calendar, alarm interrupt, and anti-tamper detection.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad; 48-pin quad flat leaded configuration optimized for reflow assembly and thermal dissipation in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power 8-bit microcontroller applications.

Compared with STM8L152C8T7, the STM8L151C8T7 saves BOM cost and PCB area where LCD is unused; versus STM32L051K8U6, it delivers superior analog integration and lower system-level component count for metering and sensor UIs.

Availability

STM8L151C8T7 is available at Aetrix Electronics and suitable for smart metering, portable diagnostics, and industrial sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for STM8L151C8T7 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 devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STM8L ultra-low-power MCU family targets battery-operated and energy-harvesting applications demanding sub-µA sleep currents, integrated analog peripherals, and long-term supply stability - with STM8L151C8T7 optimized for cost-sensitive, space-constrained metering and sensing.

FAQ

What is the maximum operating frequency and corresponding power consumption of the STM8L151C8T7?

The STM8L151C8T7 operates at up to 16 MHz using its internal 16 MHz factory-trimmed RC oscillator or external crystal. At 16 MHz and 3.0 V, typical active-mode current is 200 µA/MHz + 330 µA (i.e., ~3.53 mA), verified per DS6948 Rev 11 Table 20. This includes core, flash, and peripheral power with all clocks enabled.

Does the STM8L151C8T7 support hardware-accelerated capacitive touch sensing?

Yes - it integrates a dedicated 16-channel capacitive sensing controller supporting touchkey, linear slider, rotary encoder, and proximity detection. Each channel uses hardware charge-transfer measurement with <5 µs conversion time and built-in noise filtering, eliminating need for external touch ICs or software-based polling.

How does the RTC maintain accuracy across temperature and voltage variations?

The RTC achieves ±0.5 ppm accuracy via digital calibration against a 32 kHz external crystal (LSE), with compensation applied in firmware using factory-stored trim values. It operates independently in Active-halt mode with full calendar/alarm functionality, and includes anti-tamper detection to invalidate timekeeping upon physical intrusion.

What debug interface does the STM8L151C8T7 use, and is JTAG supported?

The device uses SWIM (Single-Wire Interface Module) for non-intrusive debugging and programming via a single dedicated pin (PD3). JTAG is not supported; SWIM enables full flash read/write, breakpoint setting, and register inspection at run-time without halting the CPU, compatible with ST-LINK/V2 and third-party debuggers.