STMicroelectronics STM8S208CBT6

Overview

STM8S208CBT6 from STMicroelectronics is an 8-bit high-performance microcontroller featuring a Harvard-architecture STM8 core, 24 MHz max CPU frequency, 128 KB Flash, 2 KB data EEPROM, 10-bit ADC with 16 channels, dual UARTs (including LIN-compliant UART3), SPI, I²C, and CAN 2.0B interface - deployed in automotive body control modules requiring real-time sensor fusion and actuator coordination.

For engineers reviewing the STM8S208CBT6 datasheet, STM8S208CBT6 pinout, STM8S208CBT6 application, or STM8S208CBT6 equivalent, key selection considerations include CAN bus integration capability, SWIM single-wire debug support, 16-channel analog input multiplexing, and industrial-grade operating temperature range (–40 °C to +85 °C) with robust I/O sink strength (up to 20 mA per high-sink pin).

Technical Context

The STM8S208CBT6 implements a 3-stage pipelined Harvard architecture core with extended instruction set and nested interrupt controller supporting 32 interrupts and up to 37 external interrupt sources across 6 vectors. Its clock system integrates user-trimmable 16 MHz RC, low-power 128 kHz RC, and crystal oscillator with clock security monitoring.

Peripheral subsystems include an advanced 16-bit TIM1 timer with dead-time insertion and complementary outputs for motor control, two 16-bit general-purpose timers (TIM2/TIM3), an 8-bit basic timer (TIM4), and a window watchdog plus independent watchdog - all configurable via dedicated register sets and individually gated clock domains.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch) with 48 leads; thermally enhanced for industrial ambient operation up to +85 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8S207R8T6, STM8S208CBT6 adds CAN 2.0B and doubles Flash capacity, enabling distributed automotive networking; versus STM32F042F6P6, it trades USB for CAN and retains EEPROM, simplifying data logging in resource-constrained embedded nodes.

Availability

STM8S208CBT6 is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor interfaces, smart power outlets, and home appliance control panels requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for STM8S208CBT6 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 STM8S series targets cost-sensitive, high-reliability 8-bit applications in automotive, industrial, and appliance markets - emphasizing robustness, integrated peripherals, and long-term supply assurance over raw performance.

FAQ

Does STM8S208CBT6 support in-system programming via SWIM?

Yes. The Single Wire Interface Module (SWIM) uses the NRST pin to enable full in-system programming and debugging without dedicated JTAG pins. It supports flash erase, program, and verification at full speed, with no external hardware required beyond a SWIM-compatible programmer such as ST-LINK/V2.

What is the maximum ADC sampling rate achievable with STM8S208CBT6?

The 10-bit ADC achieves up to 1 MSPS conversion rate when configured with minimum sampling time (1.5 ADC clock cycles) and driven by the system clock (24 MHz). With internal prescaler set to divide-by-1, effective sampling rate reaches 1 million conversions per second under optimal conditions.

Can the internal 16 MHz RC oscillator be calibrated for improved accuracy?

Yes. The internal high-speed RC oscillator (HSI) is user-trimmable via the CLK_HSITRIMR register, allowing ±1% frequency adjustment in 0.5% steps. Calibration can be performed during production test or field update using a known reference clock source like an external crystal or UART baud rate measurement.

Is the CAN peripheral compatible with ISO 11898-1 physical layer requirements?

No. The STM8S208CBT6 integrates only the CAN protocol controller (beCAN), not the physical transceiver. Compliance with ISO 11898-1 requires an external CAN transceiver (e.g., TJA1042, SN65HVD230) connected to PB5 (CAN_RX) and PB6 (CAN_TX) pins to handle differential signaling and bus arbitration.