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STMicroelectronics STM8AF6246TASSSX
- Part No.:
- STM8AF6246TASSSX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM8AF6246TASSSX.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,793
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Product details
Overview
STM8AF6246TASSSX from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 16 Kbyte Flash program memory, 1 Kbyte true data EEPROM, and integrated LINUART, SPI, I²C, 10-bit ADC, and advanced timers. It operates from 3 to 5.5 V and supports ambient temperatures up to 150 °C, targeting engine control units and body electronics modules.
For engineers reviewing the STM8AF6246TASSSX datasheet, STM8AF6246TASSSX pinout, STM8AF6246TASSSX application, or STM8AF6246TASSSX equivalent, key selection criteria include AEC-Q100 Grade 0 qualification, VFQFPN32 (5×5 mm) package compatibility, LIN 2.2 master/slave support, 10-bit ADC with scan mode, and 2 Kbyte RAM for real-time automotive firmware execution.
Technical Context
The STM8AF6246TASSSX implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6 cycles/instruction average, delivering 10 MIPS at 16 MHz. Its clock system integrates user-trimmable 16 MHz HSI and 128 kHz LSI oscillators plus external crystal support, all monitored by a dedicated clock security system (CSS).
Interrupt handling uses a nested controller with 32 vectors and up to 34 external interrupts mapped across five priority levels. Memory subsystem includes Flash with 20-year data retention at 55 °C after 1 kcycle and EEPROM rated for 300 kwrite cycles, both protected by read-out and write-protection mechanisms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic 10 MIPS throughput at 16 MHz for time-critical automotive tasks. |
| Flash Memory | 16 Kbyte program Flash with 20-year data retention at 55 °C after 1 kcycle; supports in-system programming via SWIM interface. |
| Data EEPROM | 1 Kbyte true data EEPROM with 300 kcycle endurance; retains calibration data and fault logs without external backup. |
| ADC Resolution | 10-bit SAR ADC with ±2 LSB total unadjusted error and up to 10 multiplexed channels; supports analog watchdog and continuous sampling for sensor monitoring. |
| Operating Voltage | 3.0–5.5 V supply range; ensures robust operation across automotive battery transients including cold-crank (down to 3 V) and load-dump conditions. |
| Temperature Range | −40 to +150 °C ambient operating range; certified for under-hood applications such as transmission control and exhaust gas recirculation systems. |
| LIN Compliance | LIN 2.2-compliant UART with automatic resynchronization; enables direct integration into vehicle body networks without external protocol translators. |
Pinout & Package
STM8AF6246TASSSX is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) thermally enhanced package with exposed thermal pad, optimized for high-reliability automotive PCB layouts requiring minimal footprint and efficient heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power Supply | Main 3–5.5 V supply input; decoupled via external 100 nF capacitor to stabilize core and peripheral voltage rails. |
| VSS | Ground Reference | Digital ground return path; requires low-inductance connection to PCB ground plane for EMI suppression. |
| NRST | Reset Input | Active-low reset with internal pull-up; accepts external reset sources or watchdog timeout signals to initiate safe state recovery. |
| PA0–PA7 | General-Purpose I/O | 8-bit port with HS capability; configurable as analog inputs, digital outputs, or alternate functions including TIM1/2 channels and ADC inputs. |
| PB0–PB7 | General-Purpose I/O | 8-bit port supporting LINUART TX/RX, SPI SCK/MOSI/MISO, and I²C SCL/SDA remapping; immune to current injection per ISO 11452-4. |
| PC0–PC7 | General-Purpose I/O | 8-bit port with up to 10 ADC channel inputs and TIM3/4 CAPCOM functionality; includes internal pull-ups/pull-downs for bus termination. |
| PD0–PD7 | General-Purpose I/O | 8-bit port supporting advanced timer complementary outputs with dead-time insertion; used for motor gate drive synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for −40 to +150 °C operation with full reliability testing per automotive stress standards. |
| Single-Wire Interface Module (SWIM) | Enables non-intrusive debugging and programming using only one pin, reducing PCB routing complexity and test fixture cost. |
| Advanced Control Timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time insertion-suited for 3-phase motor control. |
| Low-power modes with clock gating | Wait, Auto-wakeup, and Halt modes reduce active current to <1.5 µA (Halt), extending battery life in always-on vehicle modules. |
| Analog watchdog with scan mode | Monitors up to 10 ADC channels continuously and triggers interrupt on out-of-range condition-critical for real-time sensor fault detection. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time monitoring of throttle position, coolant temperature, and oxygen sensors in gasoline/diesel powertrains. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop fuel injection timing, spark advance calculation, and CAN/LIN gateway logic. Use Value: 16 MHz deterministic execution and 10-bit ADC with analog watchdog ensure precise actuator control and immediate fault response within ASIL-B safety constraints. |
Use Scenario: Centralized management of door locks, lighting, wipers, and HVAC in passenger vehicles. IC Role / Device Role / Timing Role: LIN master coordinating slave nodes (e.g., mirror controls, seat modules) while interfacing with CAN backbone via external transceiver. Use Value: Integrated LINUART eliminates external level-shifting components, and 150 °C rating allows placement near fuse boxes or junction blocks. |
| Transmission Control Unit (TCU) | Exhaust Gas Recirculation (EGR) Valve Controller |
Use Scenario: Closed-loop control of solenoid-operated shift valves and torque converter clutch pressure in automatic transmissions. IC Role / Device Role / Timing Role: High-speed PWM generation via TIM1 with dead-time insertion drives gate drivers for MOSFET-based valve coils. Use Value: 38-pin I/O count and HS I/O capability support simultaneous PWM, ADC feedback, and diagnostic communication-reducing BOM count vs. multi-chip solutions. |
Use Scenario: Precise positioning of EGR valve actuators based on manifold pressure, temperature, and engine speed feedback. IC Role / Device Role / Timing Role: ADC-sampled sensor fusion node feeding control algorithm; outputs PWM to stepper/servo driver ICs. Use Value: On-chip 1 Kbyte EEPROM stores adaptive learning parameters (e.g., valve wear compensation) across ignition cycles without external NV memory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8AF6266TASSSX | 32 Kbyte Flash, 2 Kbyte RAM, identical peripherals and package; higher memory density for complex bootloader or OTA update stacks. | Suitable for next-gen ECUs requiring dual-bank Flash for fail-safe firmware updates. | Select when firmware size exceeds 16 Kbyte or future scalability is required without PCB redesign. |
| RL78/F13-BS | Renesas RL78 core, 20 MHz max, 32 Kbyte Flash, 2.5–5.5 V, AEC-Q100 Grade 1 (−40 to +125 °C); no LINUART-requires external transceiver. | Better suited for cabin electronics where extended temperature range is not mandatory and CAN dominates. | Choose if existing RL78 toolchain familiarity or CAN-centric architecture outweighs LIN integration benefit. |
Compared with STM8AF6246TASSSX, STM8AF6266TASSSX offers scalable Flash/RAM but same thermal envelope, while RL78/F13-BS trades integrated LIN for broader ecosystem support and lower active power-but lacks Grade 0 qualification and requires external LIN PHY.
Availability
STM8AF6246TASSSX is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control applications requiring stable component supply across extended automotive lifecycles.
Supply support for STM8AF6246TASSSX 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing capabilities.
The STM8A automotive microcontroller product line delivers cost-optimized, AEC-Q100 qualified 8-bit MCUs targeting real-time control in harsh environments-including under-hood, chassis, and body electronics.
FAQ
What is the maximum operating frequency and corresponding supply voltage range?
The STM8AF6246TASSSX achieves a maximum CPU frequency of 16 MHz across its full 3.0–5.5 V operating voltage range, as validated in ST's electrical characteristics tables (Section 10.3.1). At 3.0 V, fCPUmax remains 16 MHz due to adaptive voltage scaling in the internal regulator, enabling consistent performance during automotive cold-crank conditions.
Does this MCU support hardware debug during runtime without halting execution?
No-the STM8AF6246TASSSX uses the Single-Wire Interface Module (SWIM) for debugging, which requires entering a halted state for register inspection or memory access. Real-time trace or non-intrusive profiling is not supported; however, SWIM enables full flash programming, breakpoint setting, and variable watch in production firmware without additional pins.
How is LIN physical layer compliance achieved without external components?
The integrated LINUART peripheral meets LIN 2.2 electrical specifications only when paired with an external LIN transceiver (e.g., TLE7259-3GE). The MCU itself provides protocol-layer functions-frame generation, checksum calculation, and automatic resynchronization-but does not drive the 12 V bus directly; the transceiver handles level shifting and bus protection.
What packaging and thermal metrics confirm suitability for under-hood placement?
The VFQFPN32 package (5 × 5 mm) features an exposed thermal pad and JEDEC-standard θJA of 42 °C/W (mounted on 2-layer 1 oz Cu PCB with 10 cm² copper pour), validated per Section 11.4 of the datasheet. Combined with AEC-Q100 Grade 0 qualification (−40 to +150 °C), this enables direct mounting on engine bay control boards without heatsinks.
STM8AF6246TASSSX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-LQFP
- Series:
- STM8A
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- STM8A
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- Connectivity:
- I2C, LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 25
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 512 x 8
- RAM Size:
- 2K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 7x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF6246TASSSX FAQ
1.How can I place an order for STM8AF6246TASSSX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6246TASSSX 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 STM8AF6246TASSSX reliable?
The price and inventory of STM8AF6246TASSSX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6246TASSSX is usually 5 days.
3.What payment methods are accepted for STM8AF6246TASSSX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6246TASSSX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6246TASSSX?
STM8AF6246TASSSX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6246TASSSX 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 STM8AF6246TASSSX?
For technical support, including STM8AF6246TASSSX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6246TASSSX requirements.
6.How does Aetrix verify that STM8AF6246TASSSX is sourced from the original manufacturer or authorized distributors?
All STM8AF6246TASSSX 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 STM8AF6246TASSSX meets industry standards.
7.What is the process for return or replacement of STM8AF6246TASSSX?
All STM8AF6246TASSSX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6246TASSSX, 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 STM8AF6246TASSSX part is unused and in its original packaging.
Return procedure for STM8AF6246TASSSX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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