STMicroelectronics STM8L151K4T6TR

Overview

STM8L151K4T6TR 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 BCD calendar and auto-wakeup, and integrated capacitive touch sensing (16 channels). It operates from 1.65 V to 3.6 V and supports industrial temperature range (–40 °C to +85 °C), targeting battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM8L151K4T6TR datasheet, STM8L151K4T6TR pinout, STM8L151K4T6TR application, or STM8L151K4T6TR equivalent, key selection criteria include ultra-low-power operation (350 nA Halt mode), on-chip RTC with periodic wake-up, hardware capacitive touch support, and SWIM-based non-intrusive debugging for rapid firmware iteration in constrained-energy systems.

Technical Context

The STM8L151K4T6TR implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. It integrates dual clock domains: high-speed (HSE/LSE/HSI) and low-speed (LSI/38 kHz RC), managed by a Clock Security System and programmable voltage detector (PVD).

Its low-power architecture includes five distinct modes-Wait, Low Power Run (5.1 µA), Low Power Wait (3 µA), Active-Halt with RTC (1.3 µA), and Halt (350 nA)-with sub-microsecond wakeup (4.7 µs from Halt). Peripheral clock gating and independent peripheral power control enable granular energy optimization.

Key Specifications

Pinout & Package

STM8L151K4T6TR is housed in a 32-pin LQFP package (7 × 7 mm, 0.8 mm pitch) with exposed pad for thermal management. All 29 I/O pins are individually mappable to interrupt vectors and support capacitive sensing input.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L051F3P6, STM8L151K4T6TR adds RTC, DAC, and touch-critical for time-aware sensing. Versus STM32L011D4P6, it trades 32-bit flexibility for lower power and native touch, reducing firmware complexity in human-interface applications.

Availability

STM8L151K4T6TR is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial wireless sensor nodes, and home automation touch panels requiring stable component supply across long product lifecycles.

Supply support for STM8L151K4T6TR 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 analog products for industrial, automotive, and consumer markets.

The STM8L ultra-low-power MCU family targets energy-constrained applications such as battery-operated meters, wearables, and IoT edge nodes-prioritizing nanowatt sleep modes, integrated analog peripherals, and robust development tooling.

FAQ

What is the minimum operating voltage for STM8L151K4T6TR in Halt mode?

The device maintains full functionality-including RAM retention and RTC operation-at 1.65 V in Halt mode, as specified in Section 9.3.1 of DS6372 Rev 17. Below 1.65 V, the ultra-safe BOR circuit asserts reset to prevent undefined behavior, with five selectable thresholds enabling precise brownout tuning for specific battery chemistries.

Does STM8L151K4T6TR support hardware-accelerated capacitive touch on all GPIOs?

No-only 16 designated channels (mapped to specific pins across PA, PB, PC, and PD ports) are routed to the hardware touch controller. Pin assignment is fixed per device variant and documented in Table 5 of DS6372; unused GPIOs function as standard digital I/O but lack touch sensing capability.

Can the 12-bit DAC output drive a 1 kΩ load without external buffering?

Yes-the integrated output buffer supports rail-to-rail operation with ±10 mA drive capability, verified per Table 52 (DAC output on PB4–PB6) and Figure 132 in DS6372. At 3.3 V supply, it maintains monotonicity and <1 LSB INL up to 100 µA load; for heavier loads, external op-amp buffering is recommended.

Is SWIM debugging compatible with production firmware and secure boot configurations?

SWIM remains fully functional even with read-out protection (ROP) enabled at Level 1, allowing non-intrusive debugging and flash programming. However, ROP Level 2 permanently disables SWIM access after first unlock attempt-intended for final production security. Debugging must be completed before activating ROP Level 2.