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STMicroelectronics STM8S208RBT3
- Part No.:
- STM8S208RBT3
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM8S208RBT3.pdf
- Description:
- IC MCU 8BIT 128KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,920
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Product details
Overview
STM8S208RBT3 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 for real-time sensor fusion and actuator coordination.
For engineers reviewing the STM8S208RBT3 datasheet, STM8S208RBT3 pinout, STM8S208RBT3 application, or STM8S208RBT3 equivalent, key selection considerations include CAN bus integration capability, SWIM single-wire debug support, 68 I/O count in LQFP80, low-power active-halt mode (0.7 µA typical), and 96-bit unique ID for secure firmware binding.
Technical Context
The STM8S208RBT3 implements a 3-stage pipelined Harvard-architecture core with extended instruction set and nested interrupt controller supporting 32 interrupts and up to 37 external IRQs across 6 vectors. Its clock system integrates user-trimmable 16 MHz RC, low-power 128 kHz RC, and crystal oscillator with clock security monitor.
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), beCAN 2.0B controller operating at 1 Mbit/s, and dual UARTs with LIN 2.1 master/slave auto-resynchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8 8-bit Harvard core with 3-stage pipeline; enables deterministic 20 MIPS @ 24 MHz without wait states below 16 MHz. |
| Flash Memory | 128 KB program Flash with 20-year data retention at 55 °C after 10 kcycles; supports in-application programming (IAP) and option byte protection. |
| Data EEPROM | 2 KB true data EEPROM with 300 kcycle endurance; independent from Flash, enabling robust parameter storage in automotive environments. |
| CPU Clock Speed | Up to 24 MHz fCPU; achieves zero-wait-state operation ≤16 MHz, critical for deterministic real-time control loops. |
| ADC Resolution & Channels | 10-bit SAR ADC with up to 16 input channels and hardware-accelerated scan mode; supports differential inputs and analog watchdog. |
| Communication Peripherals | beCAN 2.0B (1 Mbit/s), 2x UART (UART1 + UART3 with LIN 2.1), SPI (10 Mbit/s), I²C (400 Kbit/s); all with independent clock gating for power optimization. |
| Supply Voltage Range | 2.95 V to 5.5 V; supports direct connection to automotive battery rails and industrial 3.3 V/5 V systems without level-shifting. |
| Operating Temperature | –40 °C to +85 °C; qualified for extended industrial and under-hood automotive applications per AEC-Q100 stress test requirements. |
Pinout & Package
LQFP80 (14 × 14 mm, 0.5 mm pitch) package with 68 user-configurable I/Os including 18 high-sink outputs (20 mA), SWIM debug interface on pin 12, NRST on pin 1, VCAP capacitor pad on pin 7, and dedicated CANH/CANL pins (67/68).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NRST) | Active-low reset input | Asynchronous reset with internal pull-up; accepts 100 ns minimum pulse width; supports external reset supervisor ICs. |
| 12 (SWIM) | Single Wire Interface Module | Dedicated debug port for programming and real-time debugging using ST-LINK; requires no additional UART pins or JTAG header. |
| 67 (CANH) | CAN bus high differential output | Direct connection to ISO 11898-2 transceiver; supports 1 Mbit/s bit rate with built-in CAN protocol engine and message filtering. |
| 68 (CANL) | CAN bus low differential output | Complementary to CANH; enables robust noise-immune differential signaling over automotive harnesses. |
| 7 (VCAP) | Voltage regulator decoupling | Connects to 1 µF ceramic capacitor to stabilize internal 1.8 V regulator; mandatory for reliable operation above 16 MHz. |
Key Features
| Feature | Design Value |
|---|---|
| SWIM single-wire debug | Enables full flash programming, breakpoint setting, and register inspection using only one I/O pin - reduces PCB footprint and BOM cost vs. JTAG. |
| beCAN 2.0B controller | Integrated CAN protocol engine with 16 message objects, automatic retransmission, and error confinement - eliminates need for external CAN controller. |
| 96-bit unique ID | Factory-programmed read-only identifier used for device authentication, license binding, and secure boot key derivation in OTA update systems. |
| Low-power modes | Wait (1.5 µA), active-halt (0.7 µA), and halt (0.35 µA) modes with selective peripheral clock gating - extends battery life in always-on telematics nodes. |
| High-sink I/O capability | 18 pins rated for 20 mA sink current; directly drives LEDs, relays, and small solenoids without external drivers in body electronics. |
| Internal trimmable RC oscillator | 16 MHz RC with ±1% accuracy after user trimming; eliminates external crystal for cost-sensitive applications while maintaining UART timing tolerance. |
Applications
| Automotive Body Control Unit (BCU) | Industrial Motor Drive Interface |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, mirror adjustment, and interior lighting in 12 V vehicle platforms. IC Role / Device Role / Timing Role: Main MCU executing LIN slave communication with sensors/actuators, managing PWM for motor speed control, and monitoring CAN bus diagnostics. Use Value: Integrated CAN + LIN + high-sink I/Os reduce component count by 3–5 discrete drivers and transceivers per node. |
Use Scenario: Closed-loop speed and position control of BLDC motors in HVAC blowers and conveyor systems. IC Role / Device Role / Timing Role: Real-time execution of FOC algorithms via TIM1 complementary PWM outputs with dead-time insertion and ADC-triggered sampling. Use Value: Hardware-accelerated ADC scan and synchronized PWM generation enable 20 kHz switching frequency with <1 µs jitter. |
| Smart Energy Meter Communication Hub | Medical Infusion Pump Controller |
Use Scenario: Data aggregation and protocol translation between RS-485 (DLMS/COSEM), RF mesh, and local display in utility meters. IC Role / Device Role / Timing Role: Dual UART handling simultaneous DLMS parsing and wireless module command framing; I²C manages RTC and EEPROM logging. Use Value: 2 KB EEPROM ensures tamper-proof event logging (power loss, meter tampering) with 300 kcycle endurance over 10+ year field life. |
Use Scenario: Safety-critical delivery control of IV fluids with flow sensing, occlusion detection, and alarm management. IC Role / Device Role / Timing Role: ADC monitors pressure transducer and motor current; watchdog timers enforce fail-safe shutdown; SWIM enables post-deployment calibration updates. Use Value: Independent watchdog (IWDG) + window watchdog (WWDG) provide redundant safety monitoring compliant with IEC 62304 Class C software requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8S207R8T3 | Same LQFP80 package and pinout; 64 KB Flash, 1 KB EEPROM, no CAN interface. | Suitable for non-CAN applications like appliance control where cost reduction outweighs bus expansion needs. | Select when CAN is unnecessary and Flash/EEPROM requirements are ≤64 KB/1 KB - saves $0.35/unit at 10k volume. |
| STM32F042F6P6 | 32-bit ARM Cortex-M0 core, 48 MHz, 32 KB Flash, USB 2.0, no CAN; LQFP48 package (48 pins, smaller footprint). | Better suited for USB HID devices or applications requiring higher compute throughput but lacking CAN or high I/O count. | Choose for USB connectivity or future scalability; requires PCB redesign due to different pin count, voltage regulation, and debug interface (SWD vs SWIM). |
Compared with STM8S207R8T3, the STM8S208RBT3 adds CAN and doubles Flash/EEPROM - essential for automotive networking. Versus STM32F042F6P6, it trades 32-bit performance for proven CAN integration, lower power in halt mode, and simpler toolchain migration from legacy 8-bit designs.
Availability
STM8S208RBT3 is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor interfaces, smart energy metering, and medical infusion pump controllers requiring stable component supply across multi-year production cycles.
Supply support for STM8S208RBT3 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 CAN/LIN integration, ultra-low-power modes, and single-wire debug for rapid development and long-term maintenance.
FAQ
What is the maximum operating frequency and associated voltage requirement for stable operation?
The STM8S208RBT3 achieves 24 MHz fCPU with zero wait states only when VDD ≥ 4.5 V. At 3.3 V, maximum guaranteed frequency is 16 MHz per electrical characteristics Table 18. Operation above 16 MHz at 3.3 V risks timing violations in Flash access and peripheral synchronization - design must use VDD ≥ 4.5 V or implement dynamic clock scaling.
Does the device support in-system programming (ISP) via SWIM, and what hardware is required?
Yes, SWIM enables full in-system programming and debugging using only pin 12 (SWIM) and ground. Required hardware is ST-LINK/V2 or compatible debugger with SWIM protocol support; no external bootloader or UART pins needed. Firmware updates can be performed live without removing the MCU from the PCB.
How is CAN bus functionality implemented, and what external components are necessary?
CAN is implemented via an integrated beCAN 2.0B controller with 16 message objects, automatic retransmission, and error confinement. External components required are only a standard ISO 11898-2 CAN transceiver (e.g., TJA1042) and termination resistors (120 Ω at each bus end). No external CAN protocol logic or buffer memory is needed.
What are the key differences between the STM8S207 and STM8S208 product variants?
The STM8S208xx family includes CAN 2.0B interface and larger memory options (up to 128 KB Flash, 2 KB EEPROM), while STM8S207xx omits CAN and caps at 64 KB Flash and 1 KB EEPROM. Both share identical core, clock system, ADC, timers, and I/O architecture - making them pin-compatible in LQFP80 packages where CAN is unused.
STM8S208RBT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-LQFP
- Series:
- STM8S
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- STM8
- Core Size:
- 8-Bit
- Speed:
- 24MHz
- Connectivity:
- CANbus, I2C, IrDA, LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 52
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 6K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.95V ~ 5.5V
- Data Converters:
- A/D 16x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8S208RBT3 FAQ
1.How can I place an order for STM8S208RBT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8S208RBT3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM8S208RBT3 reliable?
The price and inventory of STM8S208RBT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8S208RBT3 is usually 5 days.
3.What payment methods are accepted for STM8S208RBT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8S208RBT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8S208RBT3?
STM8S208RBT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8S208RBT3 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM8S208RBT3?
For technical support, including STM8S208RBT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8S208RBT3 requirements.
6.How does Aetrix verify that STM8S208RBT3 is sourced from the original manufacturer or authorized distributors?
All STM8S208RBT3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM8S208RBT3 meets industry standards.
7.What is the process for return or replacement of STM8S208RBT3?
All STM8S208RBT3 units undergo pre-shipment inspection (PSI). If there is an issue with STM8S208RBT3, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM8S208RBT3 part is unused and in its original packaging.
Return procedure for STM8S208RBT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM8S208RBT3 Tags
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