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STMicroelectronics STM8AF6246TASSSY
- Part No.:
- STM8AF6246TASSSY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM8AF6246TASSSY.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,353
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Product details
Overview
STM8AF6246TASSSY 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 STM8AF6246TASSSY datasheet, STM8AF6246TASSSY pinout, STM8AF6246TASSSY application, or STM8AF6246TASSSY equivalent, key selection criteria include AEC-Q100 Grade 0 qualification, VFQFPN32 (5×5 mm) package compatibility, LIN 2.2 compliance, 10-bit ADC with scan mode, and dual 16-bit PWM timer support for motor control timing.
Technical Context
The STM8AF6246TASSSY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and average 1.6 cycles/instruction throughput, delivering 10 MIPS at 16 MHz. Its clock system integrates user-trimmable 16 MHz HSI and 128 kHz LSI RC oscillators plus external crystal support with clock security monitoring.
Peripheral integration includes a LINUART compliant with LIN 2.2 (master/slave, auto-resync), two general-purpose 16-bit timers with CAPCOM channels, one advanced control timer with dead-time insertion and complementary outputs, and a 10-bit ADC with up to 10 multiplexed inputs, individual data buffers, and analog watchdog capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic real-time execution in safety-critical automotive functions. |
| Max fCPU | 16 MHz at 3–5.5 V supply; supports high-speed control loops without external PLL. |
| Flash Memory | 16 Kbyte program Flash with 20-year data retention at 55 °C after 1 kcycle; suitable for field-updatable firmware in harsh environments. |
| Data EEPROM | 1 Kbyte true data EEPROM with 300 kcycle endurance; retains calibration data and configuration parameters across power cycles. |
| ADC Resolution | 10-bit SAR ADC with ±2 LSB total unadjusted error and scan mode; provides accurate sensor signal digitization for temperature/pressure monitoring. |
| LIN Interface | LINUART compliant with LIN 2.2 specification, supporting master/slave modes and automatic resynchronization; eliminates need for external LIN transceiver in cost-sensitive nodes. |
| Operating Temp | −40 to +150 °C ambient; validated for under-hood applications including engine management and transmission control. |
| Supply Voltage | 3.0 to 5.5 V; compatible with 5 V legacy automotive systems and 3.3 V modern subsystems without level-shifting. |
Pinout & Package
STM8AF6246TASSSY is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) thermally enhanced package with exposed thermal pad, optimized for compact automotive PCB layouts and high-reliability solder joints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 3–5.5 V supply rail; requires local 100 nF ceramic decoupling near pin for stable core operation. |
| VSS | Ground reference | Digital ground return; must be connected to low-impedance PCB plane to minimize noise coupling into analog peripherals. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts external reset supervisor or manual reset button. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with HS capability; supports alternate functions including TIM1/2 channels and ADC inputs. |
| PB0–PB7 | General-purpose I/O port B | 8-bit bidirectional port; includes LINUART TX/RX, SPI SCK/MOSI/MISO, and I²C SCL/SDA pins. |
| PC0–PC7 | General-purpose I/O port C | 8-bit bidirectional port; provides additional ADC channels, timer CAPCOM inputs, and external interrupt sources. |
| PD0–PD7 | General-purpose I/O port D | 8-bit bidirectional port; supports advanced timer complementary outputs and dead-time control signals. |
| VCAP | Internal voltage regulator capacitor connection | Must connect 2.2 µF X7R ceramic capacitor between VCAP and VSS to stabilize internal 1.8 V regulator for core logic. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for −40 to +150 °C operation per Rev G; meets automotive reliability requirements without derating. |
| Integrated LIN 2.2 interface | Hardware-accelerated LINUART with automatic baud rate resynchronization; reduces CPU overhead in networked body control modules. |
| Advanced control timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time insertion; enables precise 3-phase motor gate drive timing. |
| True data EEPROM | 1 Kbyte on-chip EEPROM with 300 kcycle endurance and byte-level erase; stores adaptive learning values in engine control without external nonvolatile memory. |
| Low-power operating modes | Wait, Auto-wakeup, and Halt modes with configurable clock gating; achieves sub-µA current in Halt mode for battery-sensitive telematics nodes. |
| Analog watchdog & scan mode | ADC monitors up to 10 channels in sequence with automatic threshold violation detection; triggers interrupt on out-of-range sensor readings without CPU polling. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Real-time monitoring of crankshaft position, throttle angle, and coolant temperature in gasoline engine management. IC Role / Device Role / Timing Role: Primary MCU executing fuel injection timing, spark advance calculation, and OBD-II diagnostics via LIN bus. Use Value: 16 MHz deterministic execution and 10-bit ADC with analog watchdog ensure precise closed-loop combustion control under thermal stress. |
Use Scenario: Centralized control of door locks, window lifts, interior lighting, and mirror adjustment in mid-tier vehicles. IC Role / Device Role / Timing Role: LIN slave node coordinating with master ECU; manages GPIO-driven actuators and interprets LIN command frames. Use Value: Integrated LINUART and 38 HS I/Os eliminate external transceivers and reduce BOM count while maintaining AEC-Q100 compliance. |
| Transmission Control Unit (TCU) | Heating/Ventilation/Air Conditioning (HVAC) |
|
Use Scenario: Gear shift logic, solenoid driver timing, and torque converter clutch control in 6-speed automatic transmissions. IC Role / Device Role / Timing Role: Timing-critical actuator controller using TIM1's dead-time insertion for complementary PWM outputs to H-bridge drivers. Use Value: Advanced control timer ensures safe switching transitions and prevents shoot-through in high-current valve coil drivers. |
Use Scenario: Climate zone regulation using cabin temperature, humidity, and sunload sensor inputs with fan speed and blend door actuation. IC Role / Device Role / Timing Role: Sensor fusion processor running PID algorithms; interfaces with HVAC LIN master and drives DC brushless blower motors. Use Value: 1 Kbyte EEPROM retains user preference settings across ignition cycles; 150 °C rating supports placement near heater cores. |
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 |
|---|---|---|---|
| STM8AF6266TASSSY | 32 Kbyte Flash, 2 Kbyte RAM, identical peripherals and package; higher memory capacity. | Required when firmware exceeds 16 Kbyte or additional RAM is needed for complex diagnostics. | Select if future firmware growth or multi-tasking RTOS usage demands larger memory footprint. |
| RL78/F13-BSL3A | Renesas RL78 core, 32 Kbyte Flash, 2.7–5.5 V, −40 to +125 °C; lacks integrated LIN but offers CAN 2.0B. | Suitable for CAN-based chassis networks where LIN is not required; lower max ambient temperature rating. | Choose only if CAN interface is mandatory and 150 °C operation is not required; verify LIN replacement with external transceiver. |
Compared with STM8AF6246TASSSY, STM8AF6266TASSSY offers scalable memory within the same pinout and qualification, while RL78/F13-BSL3A trades LIN integration and extended temperature range for CAN capability-making it unsuitable for direct drop-in replacement in high-temp LIN nodes.
Availability
STM8AF6246TASSSY is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and HVAC systems requiring stable component supply across automotive production lifecycles.
Supply support for STM8AF6246TASSSY 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 technologies with over 45 years of microcontroller innovation.
The STM8A automotive MCU product line delivers cost-optimized, AEC-Q100 qualified 8-bit solutions for real-time control in engine management, body electronics, and chassis systems-designed specifically for functional safety and thermal resilience in under-hood environments.
FAQ
What is the maximum junction temperature rating for STM8AF6246TASSSY?
The device is qualified for operation up to +150 °C ambient temperature per AEC-Q100 Grade 0, with a maximum junction temperature of +175 °C under specified thermal conditions. The VFQFPN32 package's exposed thermal pad must be soldered to a dedicated copper pour for effective heat dissipation in continuous high-load scenarios.
Does STM8AF6246TASSSY require an external LIN transceiver?
No. The integrated LINUART peripheral complies fully with LIN 2.2 and supports both master and slave modes with hardware-level frame formatting and automatic resynchronization. Only a single external LIN bus driver (e.g., TLE7259-3GE) is needed for physical layer interfacing-no protocol translation or software stack overhead is required.
How is the 1 Kbyte data EEPROM organized and accessed?
The true data EEPROM is organized as 1024 bytes with byte-level erasure and programming. It is accessed via dedicated EEPROM control registers (FLASH_IAPSR, FLASH_PUKR, FLASH_DUKR) and supports read-modify-write operations without halting CPU execution. Endurance is rated at 300,000 write/erase cycles per byte under standard automotive conditions.
Can STM8AF6246TASSSY operate reliably at 5.5 V supply?
Yes. The device is fully specified for operation across 3.0–5.5 V, with all electrical characteristics-including 16 MHz maximum fCPU, ADC accuracy, and I/O drive strength-guaranteed at VDD = 5.5 V and TA = −40 to +150 °C. Internal voltage regulation ensures consistent core performance regardless of rail variation within this range.
STM8AF6246TASSSY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-LQFP
- Series:
- STM8A
- Packaging:
- Tray
- 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:
STM8AF6246TASSSY FAQ
1.How can I place an order for STM8AF6246TASSSY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6246TASSSY 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 STM8AF6246TASSSY reliable?
The price and inventory of STM8AF6246TASSSY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6246TASSSY is usually 5 days.
3.What payment methods are accepted for STM8AF6246TASSSY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6246TASSSY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6246TASSSY?
STM8AF6246TASSSY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6246TASSSY 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 STM8AF6246TASSSY?
For technical support, including STM8AF6246TASSSY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6246TASSSY requirements.
6.How does Aetrix verify that STM8AF6246TASSSY is sourced from the original manufacturer or authorized distributors?
All STM8AF6246TASSSY 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 STM8AF6246TASSSY meets industry standards.
7.What is the process for return or replacement of STM8AF6246TASSSY?
All STM8AF6246TASSSY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6246TASSSY, 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 STM8AF6246TASSSY part is unused and in its original packaging.
Return procedure for STM8AF6246TASSSY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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