STMicroelectronics STM8L101G3U6TR

Overview

STM8L101G3U6TR from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 8 Kbytes Flash, 1.5 Kbytes RAM, and integrated peripherals including two 16-bit timers, USART, SPI, I²C, two comparators, infrared interface, and a beeper timer. It operates from 1.65 V to 3.6 V across –40 °C to +85 °C, with dynamic run current of 150 µA/MHz - optimized for battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM8L101G3U6TR datasheet, STM8L101G3U6TR pinout, STM8L101G3U6TR application, or STM8L101G3U6TR equivalent, key selection criteria include ultra-low-power Halt mode (0.3 µA), SWIM debug interface, UFQFPN28 package compatibility, and integrated IR transmitter capability for remote control subsystems.

Technical Context

The STM8L101G3U6TR implements the STM8 CISC core delivering up to 16 MIPS at 16 MHz, with dual internal oscillators: a 16 MHz high-speed RC (HSI) for active operation and a 38 kHz low-consumption RC (LSI) for independent watchdog and auto-wakeup unit timing. Its nested interrupt controller supports 29 external sources with software-configurable priority.

Memory architecture includes ECC-protected Flash with in-application programming, 2 Kbytes of data EEPROM, and flexible read/write protection. Low-power modes - Wait, Active-halt, and Halt - are managed via dedicated voltage regulators and POR/PDR circuitry, enabling sub-µA retention in Halt with fast 4 µs wakeup from HSI.

Key Specifications

Pinout & Package

STM8L101G3U6TR is housed in a 28-pin UFQFPN (4 × 4 mm, 0.5 mm pitch) package with exposed thermal pad. Pin assignments match the standard STM8L101G3x series layout per Figure 6 of DocID15275 Rev 16.

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, the STM8L101G3U6TR provides double Flash, integrated EEPROM, and IR capability - essential for self-contained remotes. Versus EFM8LB12F32ES1, it offers lower active current and smaller footprint but lacks USB, making it optimal for cost- and power-sensitive embedded controls.

Availability

STM8L101G3U6TR is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart home remote controls, and industrial panel indicators requiring stable component supply across multi-year production cycles.

Supply support for STM8L101G3U6TR 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 IoT endpoints and portable instrumentation - emphasizing sub-µA sleep, fast wakeup, and integrated analog/peripheral functionality.

FAQ

Does STM8L101G3U6TR support in-circuit programming via SWIM?

Yes. The device features a hardware Single Wire Interface Module (SWIM) that enables non-intrusive on-chip programming and debugging using only one dedicated pin (SWIM). It supports full flash erase/write, breakpoint setting, and register inspection without halting real-time peripheral operation.

What is the maximum operating frequency and how is it achieved?

The STM8L101G3U6TR achieves up to 16 MHz CPU frequency using its internal 16 MHz high-speed RC oscillator (HSI), which requires no external crystal. Startup time is typically 4 µs, enabling rapid transitions from ultra-low-power Halt mode into full-speed execution for burst-mode sensing.

Can PA0 drive an infrared LED directly without external components?

Yes. PA0 is configured as a high-sink LED/IR driver capable of sourcing up to 20 mA (typical) with built-in modulation logic for standard IR protocols. When paired with a series resistor and IR LED, it eliminates the need for external transistor drivers or dedicated IR encoder ICs.

Is the 2 Kbytes of data EEPROM wear-leveled or managed by hardware?

No hardware wear-leveling is implemented. The 2 Kbytes of data EEPROM supports >100,000 write/erase cycles per byte and is accessed via dedicated EEPROM control registers. Firmware must implement logical addressing and rotation if endurance beyond spec is required - ST provides EEPROM emulation libraries for this purpose.