STMicroelectronics STM8L151C6U6TR

Overview

STM8L151C6U6TR from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 32 KB Flash, 1 KB data EEPROM with ECC, 2 KB RAM, 12-bit ADC (1 Msps, 25 channels), 12-bit DAC, RTC with BCD calendar and alarm, two ultra-low-power comparators, and up to 41 I/Os. It operates from 1.65 V to 3.6 V across –40 °C to +125 °C and targets battery-powered industrial sensors and portable medical devices requiring sub-µA halt mode (350 nA) and fast wakeup (4.7 µs).

For engineers reviewing the STM8L151C6U6TR datasheet, STM8L151C6U6TR pinout, STM8L151C6U6TR application, or STM8L151C6U6TR equivalent, key selection criteria include verified low-power mode current (1.3 µA Active-halt w/ RTC), LCD support exclusion (C6 variant has no LCD controller), UFQFPN48 package compatibility, and SWIM-based debugging support.

Technical Context

The STM8L151C6U6TR implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz max. It integrates dual clock domains: high-speed (1–16 MHz HSE or 16 MHz factory-trimmed RC) and low-speed (32 kHz LSE or 38 kHz RC), managed by a clock security system with failover detection.

Its power architecture supports five distinct low-power modes-Wait, Low Power Run (5.1 µA), Low Power Wait (3 µA), Active-Halt with full RTC (1.3 µA), and Halt (350 nA)-with per-pin leakage limited to 50 nA and guaranteed 4.7 µs wakeup from Halt. The device lacks LCD peripheral logic, distinguishing it from STM8L152 variants.

Key Specifications

Pinout & Package

STM8L151C6U6TR uses a 48-pin UFQFPN (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are validated per ST's DS6372 Rev 17, Table 5 (pin description) and Figure 3 (48-pin pinout). All 41 I/Os support interrupt mapping and capacitive sensing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L152C6U6TR, this part removes LCD logic to reduce die size and cost; compared with STM32L053R8T6, it trades 32-bit flexibility for deterministic 8-bit real-time response, simpler toolchain, and lower system-level power in deeply embedded sensing roles.

Availability

STM8L151C6U6TR is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, and industrial wireless sensor nodes requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for ISO 13485 and IEC 61508 compliance programs.

Supply support for STM8L151C6U6TR 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 STM8L ultra-low-power MCU product line targets energy-constrained applications such as battery-operated meters, wearables, and IoT edge nodes, emphasizing sub-µA sleep modes, integrated analog peripherals, and robust operation across extended temperature ranges.

FAQ

Does STM8L151C6U6TR support LCD driving?

No. The STM8L151C6U6TR belongs to the "without LCD" variant family (see Table 1 in DS6372 Rev 17). It lacks the LCD controller, step-up converter, and associated bias pins. For LCD support, select STM8L152C6U6TR, which shares identical package, core, and memory but adds full 4×28 segment LCD capability.

What debug interface does STM8L151C6U6TR use?

It uses the Single-Wire Interface Module (SWIM), a dedicated 1-pin debug interface supporting non-intrusive programming, real-time variable inspection, and breakpoint execution. SWIM requires no UART or JTAG hardware, operates at VDD = 1.65–3.6 V, and remains functional in all low-power modes except Halt.

Is the 12-bit DAC output buffered?

Yes. The integrated 12-bit DAC features an internal output buffer enabling rail-to-rail voltage output on pins PB4, PB5, and PB6. This eliminates need for external op-amps in calibration or actuator drive applications, and maintains accuracy under load currents up to ±2 mA per channel.

How many capacitive sensing channels does it support?

Up to 16 capacitive sensing channels via the hardware-accelerated CTS (Capacitive Touch Sensing) peripheral. It supports touchkey, proximity, linear touch, and rotary touch configurations with automatic baseline tracking and noise filtering - all handled autonomously without CPU intervention.