STMicroelectronics STM8L151C6U6

Overview

STM8L151C6U6 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 LCD controller support (though disabled in this C6 variant). It operates from 1.65 V to 3.6 V and targets battery-powered sensor nodes and portable medical devices requiring sub-µA halt-mode operation.

For engineers reviewing the STM8L151C6U6 datasheet, STM8L151C6U6 pinout, STM8L151C6U6 application, or STM8L151C6U6 equivalent, key selection criteria include active-halt current (1.3 µA), wakeup latency (4.7 µs), 41 GPIOs with interrupt mapping, capacitive touch support (16 channels), and SWIM-based non-intrusive debugging.

Technical Context

The STM8L151C6U6 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates dual oscillators (1–16 MHz HSE, 32 kHz LSE), factory-trimmed 16 MHz RC, and 38 kHz low-consumption RC, all managed by a clock security system to prevent run-time failure.

Power management includes five configurable 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-I/O leakage limited to 50 nA and fast wake-up from Halt in 4.7 µs. The embedded reset block offers 5 selectable BOR thresholds and programmable voltage detector (PVD).

Key Specifications

Pinout & Package

STM8L151C6U6 is housed in 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, Figure 3 and Table 5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L152C6U6, the STM8L151C6U6 removes LCD circuitry to reduce cost and static power; compared with STM32L051K8U6, it offers simpler toolchain integration and deterministic 8-bit timing but lacks 32-bit compute headroom and USB.

Availability

STM8L151C6U6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial wireless sensor nodes, and home appliance control panels requiring stable component supply across multi-year production cycles.

Supply support for STM8L151C6U6 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 product line targets energy-constrained applications such as battery-operated meters, wearables, and IoT edge nodes, emphasizing sub-µA sleep modes, robust RTC functionality, and integrated analog peripherals without external support components.

FAQ

What is the minimum operating voltage for STM8L151C6U6 in Halt mode?

The STM8L151C6U6 supports Halt mode down to 1.65 V, with guaranteed 350 nA current consumption and full SRAM retention. Below 1.65 V, the device enters power-down state and loses register context; BOR thresholds can be configured to trigger reset before undervoltage corruption occurs.

Does STM8L151C6U6 support in-circuit debugging without halting program execution?

Yes. The single-wire interface module (SWIM) enables non-intrusive debugging: breakpoints, variable inspection, and memory read/write occur while the CPU continues executing background tasks. No dedicated debug port pins are required-SWIM uses the NRST pin during debug session initialization.

Can the 12-bit DAC output drive a speaker directly?

No. The DAC output (on PB4/PB5/PB6) is buffered but rated for ≤1 mA sink/source and intended for precision analog references or low-current transducer biasing. Driving a speaker requires external amplification; however, the integrated beeper timer can generate 1/2/4 kHz square waves on dedicated pins for audible alerts without DAC involvement.

How many capacitive sensing channels are available, and what electrode topologies do they support?

The STM8L151C6U6 provides hardware-accelerated support for up to 16 capacitive sensing channels. These support touchkey (single-pad press), linear touch (slider), rotary touch (encoder-style rotation), and proximity (hover detection) topologies using ST's patented AC-based charge-transfer method, with built-in de-bounce and baseline tracking.