STMicroelectronics STM8L151K6T6

Overview

STM8L151K6T6 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, two ultra-low-power comparators, RTC with BCD calendar and alarm, and integrated capacitive touch sensing (up to 16 channels). It operates from 1.65 V to 3.6 V across –40 °C to +85 °C and targets battery-powered metering, portable medical devices, and smart sensors.

For engineers reviewing the STM8L151K6T6 datasheet, STM8L151K6T6 pinout, STM8L151K6T6 application, or STM8L151K6T6 equivalent, key selection considerations include active-halt current (1.3 µA with full RTC), fast wakeup time (4.7 µs from Halt), SWIM debug interface, and LQFP32 package compatibility with legacy STM8L footprint constraints.

Technical Context

The STM8L151K6T6 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz max frequency and supporting up to 40 external interrupt sources. Its clock system integrates dual oscillators (1–16 MHz HSE, 32 kHz LSE), factory-trimmed 16 MHz RC, and 38 kHz low-consumption RC with clock security monitoring.

Power management includes five configurable low-power modes - including Active-halt (1.3 µA with RTC) and Halt (350 nA) - enabled by programmable voltage detector (PVD), ultra-safe BOR with five thresholds, and per-I/O leakage control (50 nA). The peripheral set is optimized for autonomous operation: DMA supports ADC, DAC, SPI, I²C, USART, and timers; RTC enables periodic wake-up; and capacitive sensing controller requires no CPU intervention during acquisition.

Key Specifications

Pinout & Package

LQFP32 (7 × 7 mm, 0.8 mm pitch) package with 29 user I/Os, all mappable to interrupt vectors. Pin functions support flexible peripheral routing, including dedicated SWIM debug, NRST, and multiple timer/ADC/DAC/USART/I²C/SPI signal assignments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L152K6T6, the STM8L151K6T6 removes LCD functionality to reduce cost and power overhead; compared with STM32L051K8U6, it trades 32-bit processing headroom for lower gate count, smaller code size, and native capacitive sensing - making it optimal for deeply embedded, cost-sensitive, battery-operated control tasks.

Availability

STM8L151K6T6 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 consistent parametric performance across production batches.

Supply support for STM8L151K6T6 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 components for industrial, automotive, and consumer markets.

The STM8L151 product line was engineered specifically for ultra-low-power, cost-sensitive embedded applications where battery life, small footprint, and integrated analog peripherals outweigh the need for 32-bit processing - targeting metering, wearables, and IoT edge nodes.

FAQ

What is the minimum operating voltage for STM8L151K6T6 in Halt mode?

The STM8L151K6T6 supports operation down to 1.65 V in all low-power modes, including Halt (350 nA typical). At VDD = 1.65 V, the internal voltage regulator remains functional, RTC continues running in Active-halt mode, and SRAM retention is guaranteed. Below 1.65 V, the BOR circuit triggers reset to prevent undefined behavior.

Does STM8L151K6T6 support in-circuit programming after soldering?

Yes - the device features SWIM (Single-Wire Interface Module), allowing full-speed programming and non-intrusive debugging via a single pin (PA1) using standard ST-LINK/V2 or compatible programmers. No bootloader or UART-based flashing is required; firmware updates can be performed directly on assembled PCBs without removing the MCU.

How many capacitive sensing channels can operate simultaneously on STM8L151K6T6?

The STM8L151K6T6 supports up to 16 capacitive sensing channels, but they operate sequentially under hardware control - not truly simultaneous. The built-in touch controller scans channels autonomously using a shared charge-transfer method, completing a full 16-channel scan in under 10 ms while consuming <1 µA average current, freeing the CPU for other tasks.

Is the 12-bit DAC output buffered, and what is its drive capability?

Yes, the integrated 12-bit DAC includes an output buffer capable of sourcing/sinking ±5 mA at VDD = 3.3 V. It drives resistive loads directly (e.g., LED bias, analog setpoint generation) without external op-amps. Output voltage range is 0 to VDD, and settling time is 5 µs to ½ LSB, verified per Table 50 and Table 52 in DS6372 Rev 17.