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Recycle ST STM8 8-Bit MCU Series:STM8AF,STM8AL,STM8L,STM8S,STM8T

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I. STM8AF Series: Automotive-grade General-purpose 8-bit Microcontrollers

The STM8AF series is ST’s automotive-grade 8-bit microcontroller designed specifically for automotive electronics applications. Its core objective is to meet the stringent requirements of automotive electronic systems regarding reliability, stability and immunity to interference. It fully complies with the AEC-Q100 certification standard and can withstand extreme operating conditions in automotive environments, such as high temperatures, high voltages and strong electromagnetic interference, providing a cost-effective solution for automotive electronic control units (ECUs).

In terms of core features, the STM8AF series is based on the STM8 advanced core, utilising a Harvard architecture and a 3-stage pipeline design. It achieves a maximum clock speed of 16 MHz, delivering 10 MIPS of processing performance at 16 MHz, with an average of just 1.6 cycles per instruction, balancing processing efficiency with power consumption control. The series integrates a wealth of peripheral resources, including multi-channel 10-bit or 12-bit ADCs, multiple 16-bit timers, LIN interfaces, SPI interfaces and I²C interfaces. It also features an integrated true data EEPROM with an erase/write endurance of up to 300,000 cycles, capable of retaining data for 20 years at 55°C, eliminating the need for external memory chips and effectively reducing system costs. Furthermore, the series features comprehensive power management and reset mechanisms, incorporating a low-power crystal resonator, a user-tunable 16 MHz RC oscillator and a low-power 128 kHz RC oscillator. These are complemented by a clock security system and an independent watchdog (with a dedicated clock source), ensuring stable operation even under fluctuating automotive power supply conditions.

In terms of key parameters, the STM8AF series operates within a voltage range of 2.95V to 5.5V, making it suitable for automotive power supply systems; its operating temperature range spans from -40°C to +125°C, meeting the temperature requirements of various automotive locations such as the engine compartment and body; Flash program memory capacities range from 8KB to 128KB, RAM capacities from 1KB to 6KB, and EEPROM capacities from 0.5KB to 2KB, allowing users to select the appropriate model based on specific control requirements; package options include TSSOP and LQFP, providing up to 36 programmable I/O pins to support flexible circuit design.

Typical applications are primarily concentrated in the automotive electronics sector, including body control modules (BCM), door control modules, seat control, window control, automotive lighting systems, windscreen wiper control, sensor interfaces, infotainment system accessory control, as well as automotive diagnostic systems, on-board charging control and on-board network communication modules; they are also suitable for industrial auxiliary applications with high reliability requirements.

II. STM8AL Series: Automotive-grade ultra-low-power 8-bit microcontrollers

The STM8AL series is an automotive-grade, ultra-low-power sub-series within the STM8 family. Building upon the automotive-grade reliability of the STM8AF series, it focuses on optimising power consumption and is specifically designed for power-sensitive applications in automotive electronics. It is also AEC-Q100 certified, balancing ultra-low power consumption, high performance and high safety, making it the preferred solution for low-power control applications in the automotive sector.

In terms of core features, the STM8AL series utilises the STM8 enhanced core, featuring a Harvard architecture and a 3-stage pipeline. With a maximum clock frequency of 16 MHz, it delivers peak processing performance of up to 16 MIPS and supports up to 40 external interrupt sources, ensuring rapid response times to meet the demands of complex control scenarios. The standout feature of this series is its ultra-low-power design, offering five low-power modes: wait mode, low-power run mode (5.1μA), low-power wait mode (3μA), active sleep mode with full RTC (1.3μA) and sleep mode (400nA). Operating power consumption is as low as 195 μA/MHz (Flash operation) and 90 μA/MHz (RAM operation), with a leakage current of just 50 nA per I/O pin. It also supports rapid wake-up from sleep mode in 4.7 μs, significantly extending the battery life of automotive battery-powered devices. Furthermore, the series integrates a rich array of high-performance peripherals, including a 12-bit ADC (up to 1 MSPS sampling rate, up to 28 channels), a 12-bit DAC (with output buffering), multiple 16-bit timers (supporting motor control), communication interfaces such as SPI, I²C and USART, as well as a built-in low-power RTC (BCD calendar with alarm interrupts and calibration accuracy of up to ±0.5 ppm), an AES encryption hardware accelerator and a DMA controller (4 channels, supporting data transfer between peripherals and memory, and between memory and memory). Some models also support LCD drivers (up to 4x44 segments), meeting diverse automotive low-power control requirements.

In terms of key parameters, the STM8AL series operates within a voltage range of 1.8V to 3.6V, dropping as low as 1.65V in shutdown mode, making it suitable for automotive low-power power supply scenarios; the operating temperature range is -40°C to 85°C or -40°C to 125°C, accommodating various automotive application environments; Flash program memory capacity is up to 64KB, RAM capacity up to 4KB, and EEPROM capacity up to 2KB (with ECC checksum and read/write protection); package options include LQFP80, LQFP64, LQFP48 and others, providing up to 67 I/O pins with mappable interrupts, and supporting non-intrusive debugging and fast on-chip programming.

Typical applications focus on low-power automotive electronics, including automotive smart sensor nodes, in-vehicle low-power monitoring modules, automotive door lock control, window anti-pinch control, in-vehicle sleep-wake systems, tyre pressure monitoring systems (TPMS), and low-power modules for on-board diagnostic (OBD) systems. They are also suitable for low-power control applications in industrial sectors where both power consumption and reliability are subject to stringent requirements.

3. STM8L Series: General-purpose ultra-low-power 8-bit microcontrollers

The STM8L series is an ultra-low-power sub-series within the STM8 family designed for general-purpose applications. It utilises the same proprietary ultra-low-leakage current process as the STM32L series MCUs. Its core focus is to provide cost-effective solutions for power-sensitive portable devices and industrial low-power equipment, balancing ultra-low power consumption, high integration and ease of use. It is widely used in non-automotive low-power applications.

In terms of core features, the STM8L series is based on the STM8 core and is designed for ultra-low power performance. In the lowest power mode, current consumption can be as low as 0.30 μA (STM8L101 series), whilst in dynamic operation mode, current consumption is as low as 150 μA/MHz (STM8L101 series). with certain models featuring a minimum current consumption of 0.35 μA in the lowest power mode and 180 μA/MHz in dynamic operation mode. The series supports multiple low-power modes that can be flexibly switched according to the application scenario, effectively extending the service life of battery-powered devices. This series integrates a comprehensive range of peripheral resources, including commonly used peripherals such as ADCs, DACs, timers, UARTs, SPIs and I²Cs. It also features built-in RC and crystal oscillators, and supports a clock security system to ensure stable device operation. The STM8L series is divided into four distinct product lines: the Value Line, the STM8L101 series, the STM8L151/152 series and the STM8L162 series. Whilst the characteristics of each product line differ slightly, they all maintain excellent compatibility, facilitating design upgrades and product iterations.

In terms of key parameters, the STM8L series offers a wide operating voltage range to suit various power supply scenarios; its operating temperature range meets industrial-grade standards, catering to the needs of most general-purpose applications; Flash program memory capacity varies by product line, ranging from basic small capacities to medium and large capacities, whilst RAM and EEPROM capacities can also be tailored to requirements; a variety of package options are available, including compact packages suitable for the miniaturised design of portable devices.

Typical application scenarios include portable medical devices (such as blood glucose monitors and blood pressure monitors), smart wearable devices, low-power sensor nodes (such as temperature and humidity sensors, and light sensors), industrial low-power controllers, smart meters, battery-powered consumer electronics (such as remote controls and electronic scales), smart home low-power modules, and so on. Any general-purpose application requiring long-term battery operation and sensitive to power consumption falls within the scope of the STM8L series.

IV. STM8S Series: General-Purpose Mainstream 8-bit Microcontrollers

The STM8S series is the most versatile mainstream sub-series within the STM8 family. Its core focus is to meet the high-volume application demands of the industrial, consumer and computing markets, with a strong emphasis on high performance, high integration and excellent value for money. It is the most widely used sub-series within the STM8 family and is included in ST’s 10-year long-term supply guarantee programme for STM32 and STM8 microcontrollers, ensuring robust and reliable solutions for designers.

In terms of core features, the STM8S series is based on the proprietary STM8 core, utilising ST’s advanced 130nm process technology and cutting-edge core architecture. With a maximum clock speed of 24 MHz and processing power of up to 20 MIPS, it far outperforms other 8-bit microcontrollers in its class, enabling efficient handling of complex control logic and data processing. The series integrates a wealth of I/O interfaces and high-performance embedded peripherals, including on-chip EEPROM, RC oscillators, multi-channel ADCs, multiple timers (supporting PWM, capture/compare functions), and communication interfaces such as UART, SPI and I²C. These peripherals represent a key advantage that sets it apart from competing products. The STM8S series is similarly divided into four product lines, each with its own distinct features whilst remaining fully compatible and upgradeable, facilitating future design changes: the Value Line offers a basic feature set at the most affordable price, with 8-pin SO package products currently available; the STM8S103/105 Basic Line provides additional features and a wide range of packaging options; the STM8S207/208 Enhanced Line is equipped with a full suite of peripherals to meet the high-performance demands of mid-to-high-end applications; The Specialised variant offers additional analogue features and dedicated firmware solutions. Furthermore, the series supports the STM8CubeMX configuration tool, which enables rapid MCU configuration via a user-friendly graphical interface, significantly reducing development complexity, shortening development cycles and controlling development costs. It is also accompanied by a comprehensive development toolchain, ranging from economical exploration kits to complex evaluation kits and third-party tools, providing great convenience for development.

In terms of key parameters, the STM8S series operates at voltages suitable for general-purpose scenarios, ensuring high stability; its operating temperature range meets both industrial and consumer-grade requirements; Flash program memory capacities cover a wide spectrum, ranging from basic small capacities to medium and large capacities, whilst RAM capacities can be tailored to different computational needs; A variety of package options are available, ranging from 8-pin SO8 packages to multi-pin packages, to suit product designs with varying size requirements. Models such as the STM8S001J3, housed in an 8-pin SO8 package, offer an outstanding combination of features, including top-tier core processing speed, system control, memory capacity, communication peripherals and analogue functionality.

Typical application scenarios are extremely diverse, covering industrial control (such as motor control, PLCs, industrial sensors and frequency converters), consumer electronics (such as home appliance control, toys and digital products), computer peripherals (such as keyboard and mouse controllers), smart meters (such as multimeters and ammeters), and security equipment (such as access control units and alarm modules). The STM8S series is the preferred choice for any high-volume, general-purpose control application requiring high performance, high reliability and cost-effectiveness.

5. STM8T Series: 8-bit Microcontrollers Dedicated to Touch Applications

The STM8T series is a dedicated sub-series within the STM8 family designed specifically for touch applications. Its core focus is to provide highly reliable, high-sensitivity touch solutions. Based on the ProxSense charge-transfer capacitive sensing principle, it supports a wide range of touch requirements, from basic single-point touch (including proximity sensing) to advanced matrix touch (up to 300 touch points or channels), whilst maintaining low power consumption and being suitable for a variety of touch scenarios.

In terms of core features, the STM8T series is designed on the STM8L ultra-low-power platform, fully leveraging the STM8L series’ low-power Flash technology advantages. It also integrates a dedicated ProxSense touch sensing module, offering robust immunity to interference and effectively resisting the effects of electromagnetic interference and environmental noise, thereby ensuring the stability and sensitivity of touch response. The series offers a proximity detection range of up to 20 cm, and the capacitive electrodes can be made from simple conductive materials (such as copper pads or conductive ITO layers), thereby reducing the design and manufacturing costs of touch panels. The STM8T141/143 models are single-channel capacitive sensors with two independent outputs, capable of directly reporting touch or proximity events; The STM8TL52/53 series, based on a combination of ProxSense technology and the STM8L platform, further optimises low-power consumption and anti-interference performance to meet the most demanding user interface requirements. Furthermore, this series integrates the basic peripherals of the STM8 core and supports low-power modes, making it suitable for battery-powered touch devices.

In terms of key parameters, the STM8T series operates at voltages suitable for low-power applications; some models feature 16KB of Flash program memory, whilst RAM capacity varies by model. The series offers comprehensive touch detection mechanisms and low-power control capabilities; its packaging is designed to accommodate the miniaturisation of touch devices, allowing for flexible integration into various touch panels.

Typical applications focus on the touch control sector, including touch panels for household appliances (such as touch buttons on air conditioners, washing machines and microwave ovens), touch-enabled consumer electronics (such as touch operation on MP3 players and Bluetooth speakers), industrial control touch interfaces, touch modules for smart wearable devices, automotive touch control panels, and proximity sensors (such as automatic sensor lights and sensor-activated door locks). The STM8T series can be used to achieve efficient and reliable control in any scenario requiring touch interaction or proximity sensing.