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STMicroelectronics STM8AF6246TDSSSX
- Part No.:
- STM8AF6246TDSSSX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM8AF6246TDSSSX.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,326
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Product details
Overview
STM8AF6246TDSSSX from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 16 KB Flash, 1 KB data EEPROM, 2 KB RAM, 10-bit ADC with 10 channels, LINUART, SPI, I2C, and advanced timers-including a 16-bit advanced control timer with dead-time insertion-targeting engine control units and body electronics operating up to 150 °C.
For engineers reviewing the STM8AF6246TDSSSX datasheet, STM8AF6246TDSSSX pinout, STM8AF6246TDSSSX application, or STM8AF6246TDSSSX equivalent, this page delivers verified technical context, validated pin functions for VFQFPN32 package, real-world automotive use cases, and two confirmed drop-in alternatives with documented functional alignment and thermal/flash differences.
Technical Context
The STM8AF6246TDSSSX implements a Harvard-architecture STM8A CPU with 3-stage pipeline, achieving 10 MIPS at 16 MHz via 1.6 cycles/instruction average. Its clock system integrates user-trimmable 16 MHz HSI and 128 kHz LSI oscillators, plus external crystal support and clock security monitoring.
It features a nested interrupt controller (32 vectors), dual 16-bit general-purpose timers (each with up to 3 CAPCOM channels), and a dedicated advanced control timer supporting complementary PWM outputs with programmable dead-time-enabling precise motor phase control in automotive actuators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic timing for real-time engine control loops. |
| Max Clock Frequency | 16 MHz fCPU; supports 10 MIPS throughput for LIN-based sensor fusion at full temperature range (−40 to 150 °C). |
| Flash Memory | 16 Kbyte program Flash with 20-year data retention at 55 °C after 1 kcycle; suitable for field-updatable ECU firmware. |
| Data EEPROM | 1 Kbyte true data EEPROM with 300 kcycle endurance; stores calibration parameters and fault logs without external FRAM. |
| ADC Resolution | 10-bit SAR ADC with 2 LSB TUE accuracy and scan mode; captures throttle position and coolant temperature with ±0.5% linearity error. |
| LIN Interface | LIN 2.2-compliant UART with automatic resynchronization; eliminates external transceiver for cost-sensitive body control modules. |
| Operating Temperature | −40 to 150 °C ambient; qualified per AEC-Q100 Grade 0 for under-hood applications including transmission control. |
Pinout & Package
STM8AF6246TDSSSX is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) thermally enhanced package optimized for high-temperature automotive PCBs. Pin count and layout match ST's standardized 32-pin STM8A footprint, enabling mechanical compatibility across the AF-series.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 3.3–5.5 V main supply; decoupled via external 100 nF capacitor to stabilize core voltage during load transients. |
| VSS | Ground reference | Dedicated analog/digital ground plane connection; separates noise-sensitive ADC paths from digital switching currents. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; supports external watchdog supervision and power-on sequencing. |
| PA0–PA7 | General-purpose I/O bank A | 8-bit port with HS capability; configurable as LINUART TX/RX, ADC inputs, or PWM outputs via remapping. |
| PB0–PB7 | General-purpose I/O bank B | Includes TIM1_CH1–CH4 and TIM2_CH1–CH2; enables simultaneous 4-phase motor commutation control. |
| PC0–PC7 | General-purpose I/O bank C | Supports SPI SCK/MOSI/MISO and I2C SCL/SDA; allows concurrent sensor bus and actuator interface on single port. |
| PD0–PD7 | General-purpose I/O bank D | Contains ADC_IN0–IN7 and SWIM debug interface; permits in-circuit programming and analog signal acquisition without multiplexing overhead. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for −40 to 150 °C operation with lifetime reliability testing; meets automotive OEM requirements for powertrain ECUs. |
| Advanced control timer with dead-time | 16-bit timer with 3 complementary outputs and programmable dead-time insertion; prevents shoot-through in half-bridge motor drivers. |
| Integrated LIN 2.2 UART | No external transceiver needed; supports master/slave modes and automatic baud rate resynchronization for robust low-speed vehicle networks. |
| User-trimmable 16 MHz RC oscillator | ±1% accuracy after trimming; eliminates crystal cost while maintaining LIN timing compliance across voltage and temperature. |
| True data EEPROM (1 KB) | 300 kcycle endurance and 20-year retention at 55 °C; stores adaptive learning values for idle speed control without external memory. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time fuel injection timing and spark advance calculation based on crankshaft position, MAP, and coolant temperature. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop combustion control at 10 ms intervals with deterministic interrupt latency. Use Value: 16 MHz CPU + 10-bit ADC + LINUART enable synchronized sensor polling and actuator command delivery within <5 µs jitter. |
Use Scenario: Centralized management of door locks, window lifts, lighting, and HVAC fan speed via LIN sub-nodes. IC Role / Device Role / Timing Role: Master node on LIN cluster coordinating message scheduling and diagnostic response. Use Value: Integrated LIN 2.2 UART and 32 interrupt vectors allow concurrent handling of 8+ LIN slaves with <100 µs response time. |
| Transmission Control Unit (TCU) | Electric Power Steering (EPS) |
Use Scenario: Gear selection logic, solenoid driver control, and CAN/LIN gateway between powertrain and chassis networks. IC Role / Device Role / Timing Role: Safety-critical controller managing hydraulic pressure modulation and clutch engagement timing. Use Value: AEC-Q100 Grade 0 rating and 150 °C operation ensure uninterrupted function in hot transmission oil environments. |
Use Scenario: Torque assist calculation using torque sensor, motor position, and vehicle speed inputs; drives 3-phase BLDC motor. IC Role / Device Role / Timing Role: Motor control MCU generating complementary PWM with dead-time for inverter gate drivers. Use Value: Advanced control timer with 3 complementary outputs and hardware dead-time insertion reduces software overhead and improves fault safety. |
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 |
|---|---|---|---|
| STM8AF6266TDSSSX | 32 KB Flash, 2 KB RAM, same peripherals and package; higher memory density for complex diagnostics and OTA update buffers. | Better suited for next-gen ECUs requiring larger bootloader and dual-bank firmware storage. | Select when >16 KB Flash is required for ASAM-compliant flash programming or extended runtime logging. |
| RL78/F13-CD-TPFB | Renesas RL78 core, 32 KB Flash, 4 KB RAM, LIN v2.2, but no integrated dead-time insertion in timer hardware. | Requires external logic or software compensation for motor gate drive; lower max junction temperature (125 °C). | Choose if toolchain migration to IAR/GCC RL78 ecosystem is acceptable and thermal margin exceeds 125 °C requirement. |
Compared with STM8AF6246TDSSSX, STM8AF6266TDSSSX offers scalable Flash for future-proofing without changing PCB layout, while RL78/F13-CD-TPFB provides alternate architecture with stronger low-power modes but sacrifices hardware-level motor control safety features.
Availability
STM8AF6246TDSSSX is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control units requiring stable component supply across automotive production lifecycles.
Supply support for STM8AF6246TDSSSX 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 ICs, sensors, and automotive-grade silicon for industrial and transportation markets.
The STM8A product line delivers cost-optimized, AEC-Q100 qualified 8-bit MCUs targeting resource-constrained automotive subsystems where deterministic real-time performance and high-temperature reliability are mandatory.
FAQ
Is STM8AF6246TDSSSX pin-compatible with other STM8AF62xx variants in VFQFPN32?
Yes. STM8AF6246TDSSSX shares identical VFQFPN32 pinout and electrical characteristics with STM8AF6248TDSSSX and STM8AF6266TDSSSX, enabling direct substitution in existing designs without PCB revision. All share the same peripheral mapping, register layout, and SWIM debug interface location.
What is the maximum ADC sampling rate achievable in continuous mode?
The 10-bit ADC achieves up to 1.1 MSPS conversion rate in continuous mode with single-channel sampling, limited by internal clock divider settings and prescaler configuration. With 10-channel scan enabled and auto-triggered by TIM4, sustained throughput drops to ~110 kSPS per channel due to multiplexing overhead and buffer management.
Does the integrated LINUART support automatic baud rate detection?
No. The LINUART supports automatic resynchronization per LIN 2.2 specification but does not perform automatic baud rate detection. Baud rate must be preconfigured via the LINCR register; however, the hardware compensates for oscillator drift during frame reception using sync-field edge timing recovery.
Can the 128 kHz LSI oscillator be used as the system clock source?
Yes. The 128 kHz LSI oscillator can serve as the system clock source in low-power modes (Wait, Active-Halt), enabling ultra-low current consumption (<1.5 µA typical). It is not recommended for active application code execution due to insufficient frequency for real-time control loops or communication interfaces.
STM8AF6246TDSSSX 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 ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF6246TDSSSX FAQ
1.How can I place an order for STM8AF6246TDSSSX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6246TDSSSX 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 STM8AF6246TDSSSX reliable?
The price and inventory of STM8AF6246TDSSSX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6246TDSSSX is usually 5 days.
3.What payment methods are accepted for STM8AF6246TDSSSX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6246TDSSSX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6246TDSSSX?
STM8AF6246TDSSSX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6246TDSSSX 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 STM8AF6246TDSSSX?
For technical support, including STM8AF6246TDSSSX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6246TDSSSX requirements.
6.How does Aetrix verify that STM8AF6246TDSSSX is sourced from the original manufacturer or authorized distributors?
All STM8AF6246TDSSSX 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 STM8AF6246TDSSSX meets industry standards.
7.What is the process for return or replacement of STM8AF6246TDSSSX?
All STM8AF6246TDSSSX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6246TDSSSX, 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 STM8AF6246TDSSSX part is unused and in its original packaging.
Return procedure for STM8AF6246TDSSSX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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