STMicroelectronics STM8L151C4U6TR

Overview

STM8L151C4U6TR 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, two ultra-low-power comparators, RTC with BCD calendar, and up to 41 I/Os - deployed in battery-powered industrial sensors and portable medical monitors.

For engineers reviewing the STM8L151C4U6TR datasheet, STM8L151C4U6TR pinout, STM8L151C4U6TR application, or STM8L151C4U6TR equivalent, key selection criteria include active-halt current (1.3 µA), Halt mode leakage (350 nA), 1.65–3.6 V operating range, 48-pin UFQFPN package, and SWIM-based debugging support.

Technical Context

The STM8L151C4U6TR 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 or 16 MHz factory-trimmed RC) and low-speed (32 kHz LSE or 38 kHz RC), managed by a clock security system with fail-safe detection.

Its power architecture supports five distinct low-power modes - including Active-halt with full RTC operation (1.3 µA) and Halt (350 nA) - enabled by programmable voltage detector (PVD), ultra-low-power POR/PDR, and BOR with five selectable thresholds. The 12-bit ADC includes internal temperature sensor and reference voltage, while the DAC features buffered output on PB4–PB6.

Key Specifications

Pinout & Package

STM8L151C4U6TR is housed in a 48-pin Ultra Thin Fine Pitch Quad Flat No-lead (UFQFPN48) package, 7 × 7 mm body, 0.5 mm pitch, exposed thermal pad, RoHS-compliant and ECOPACK® certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L151C4U6TR, STM8L051F3P6 trades memory and analog capability for lower cost and size, while STM32L011K4U6 offers 32-bit architecture at higher active power - making the STM8L151C4U6TR optimal for deeply embedded, battery-constrained designs requiring balanced analog integration and sub-microamp sleep.

Availability

STM8L151C4U6TR is available at Aetrix Electronics and suitable for smart utility metering, portable medical monitoring, and industrial wireless sensor nodes requiring stable component supply across long-lifecycle deployments.

Supply support for STM8L151C4U6TR 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 energy-constrained applications such as battery-powered meters, wearables, and IoT edge nodes - emphasizing sub-µA sleep, integrated analog, and robust development tools like SWIM.

FAQ

What is the maximum operating frequency and corresponding power consumption of STM8L151C4U6TR?

The STM8L151C4U6TR operates at up to 16 MHz using its internal 16 MHz RC oscillator or external crystal. At 16 MHz and 3.0 V, typical active-mode current is 195 µA/MHz + 440 µA - totaling approximately 3.56 mA. This includes core, flash, and peripheral operation, verified per DS6372 Rev 17 Table 20.

Does STM8L151C4U6TR support hardware-based capacitive touch sensing?

Yes - it integrates a dedicated Capacitive Sensing GPIO (CSG) peripheral supporting up to 16 channels. It enables touchkey, proximity, linear, and rotary touch without external components, with built-in charge transfer and filtering logic. Configuration and calibration are handled via dedicated registers per RM0031 Section 13.

Can the 12-bit DAC output drive external loads directly?

The DAC features an integrated output buffer enabling direct driving of moderate-impedance loads (e.g., op-amp inputs, filter networks). It is routed exclusively to PB4, PB5, and PB6. Output swing is rail-to-rail (0–VDD), with specified linearity error ±4 LSB and settling time 6 µs - confirmed in DS6372 Rev 17 Table 50 and Figure 132.

Is SWIM debugging supported in all low-power modes?

SWIM debugging remains functional in Run, Wait, and Low Power Run modes. It is disabled in Low Power Wait, Active-halt, and Halt modes - consistent with power gating of the debug interface. Wakeup from Halt requires external event or RTC alarm before SWIM re-engagement, as documented in Section 3.19 of DS6372 Rev 17.