STMicroelectronics STM8L101F1U6ATR

Overview

STM8L101F1U6ATR from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 4 KB Flash, 1.5 KB RAM, and integrated peripherals including two 16-bit timers, USART, SPI, I²C, two comparators, and infrared (IR) interface. It operates from 1.65 V to 3.6 V, supports -40 °C to 85 °C ambient temperature, and achieves 150 µA/MHz dynamic current consumption - ideal for battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM8L101F1U6ATR datasheet, STM8L101F1U6ATR pinout, STM8L101F1U6ATR application, or STM8L101F1U6ATR equivalent, key selection criteria include its 20-pin UFQFPN package, 4 KB Flash memory size, sub-1 µA Halt-mode power draw, IR remote control capability, and SWIM-based single-wire debug interface.

Technical Context

The STM8L101F1U6ATR implements the STM8 CISC core delivering up to 16 MIPS at 16 MHz, with dual internal RC oscillators: a 16 MHz high-speed oscillator (HSI) for active operation and a 38 kHz low-power oscillator (LSI) for independent watchdog and auto-wakeup unit (AWU) timing. Its nested interrupt controller supports up to 29 external sources with software-configurable priority.

Memory architecture includes ECC-protected Flash, flexible read/write protection, and data EEPROM emulation within Flash - enabling robust firmware updates and parameter storage without external nonvolatile memory. Clock tree integrates prescalers, switchable dividers, and automatic clock source fallback for fail-safe operation in energy-constrained systems.

Key Specifications

Pinout & Package

STM8L101F1U6ATR uses the 20-pin Ultra Thin Fine Pitch Quad Flat No-lead (UFQFPN20) package with exposed thermal pad, measuring 3 mm × 3 mm and 0.5 mm lead pitch. This package supports automated optical inspection and offers improved thermal performance over TSSOP alternatives.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L051F3P6 and EFM8LB12F32ES1-QFP24, the STM8L101F1U6ATR uniquely balances minimal 3×3 mm form factor, sub-1 µA Halt power, and hardware-accelerated IR - making it optimal for space- and energy-constrained remote control and sensor edge nodes where integration reduces component count and firmware overhead.

Availability

STM8L101F1U6ATR is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart utility meter interfaces, and industrial remote control receivers requiring stable component supply across long-lifecycle industrial programs.

Supply support for STM8L101F1U6ATR 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 automotive-grade components since 1987.

The STM8L series targets ultra-low-power embedded applications - specifically optimized for battery-operated devices demanding extended runtime, robust operation across wide temperature ranges, and minimal external component count.

FAQ

What is the maximum operating frequency of the STM8L101F1U6ATR?

The STM8L101F1U6ATR runs at up to 16 MHz using its internal 16 MHz RC oscillator (HSI), which features typical accuracy of ±1% over temperature and voltage. External crystal or ceramic resonator support is not provided - all timing derives from calibrated internal RC sources.

Does the STM8L101F1U6ATR support in-circuit programming after soldering?

Yes - it supports in-circuit programming via the Single Wire Interface Module (SWIM) using ST-LINK/V2 or compatible debuggers. The SWIM pin enables full flash erase, program, and verify operations without removing the device from the PCB or requiring additional pins beyond VDD, VSS, NRST, and SWIM.

Can the internal comparators be used for windowed voltage monitoring?

Yes - each of the two comparators has four selectable inputs (including VREFINT and external pins), and their outputs can be routed to timers or interrupts. By configuring one comparator for upper threshold and another for lower threshold, software can implement precise windowed voltage supervision without ADC conversion overhead.

Is there hardware support for PWM generation on this MCU?

Yes - TIM2 and TIM3 are 16-bit general-purpose timers supporting up/down counting, input capture (IC), output compare (OC), and PWM generation on multiple channels. TIM4 is an 8-bit timer with 7-bit prescaler also usable for basic PWM, enabling concurrent motor control, LED dimming, or buzzer tone generation.