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STMicroelectronics STM8AF6246TCSSSX
- Part No.:
- STM8AF6246TCSSSX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM8AF6246TCSSSX.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:7,185
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Product details
Overview
STM8AF6246TCSSSX from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 16 Kbyte Flash memory, 1 Kbyte data EEPROM, 10-bit ADC with 10 multiplexed channels, and LINUART, SPI, and I²C interfaces. 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 STM8AF6246TCSSSX datasheet, STM8AF6246TCSSSX pinout, STM8AF6246TCSSSX application, or STM8AF6246TCSSSX equivalent, key selection criteria include automotive-grade temperature range (−40 to 150 °C), LIN 2.2 compliance, 300 kcycle EEPROM endurance, and VFQFPN32 package compatibility with space-constrained PCB layouts.
Technical Context
The STM8AF6246TCSSSX 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 5 vectors. Analog subsystem includes a 10-bit ADC with 2 LSB TUE accuracy, scan mode, analog watchdog, and individual channel data buffers - enabling precise sensor signal acquisition in harsh automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic real-time execution for safety-critical automotive firmware. |
| Max Clock Frequency | 16 MHz fCPU; supports 10 MIPS performance at full speed for responsive control loop timing. |
| Flash Memory | 16 Kbyte program Flash with 20-year data retention at 55 °C after 1 kcycle; suitable for long-life vehicle ECUs. |
| Data EEPROM | 1 Kbyte true data EEPROM rated for 300 kcycles endurance; stores calibration data and fault logs without external NV memory. |
| ADC Resolution & Channels | 10-bit ADC with ±2 LSB total unadjusted error and up to 10 multiplexed inputs; provides sufficient precision for throttle position, coolant temp, and pressure sensing. |
| Operating Temperature | −40 to +150 °C ambient; validated per AEC-Q100 Grade 0 for under-hood applications including transmission control and battery management. |
| Supply Voltage Range | 3.0 to 5.5 V; accommodates wide automotive battery transients and direct connection to 5 V or 3.3 V domains without level-shifting. |
Pinout & Package
STM8AF6246TCSSSX is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with wettable flank leads for automated optical inspection. This thermally enhanced, space-efficient package supports high-density automotive PCB layouts and meets reflow profile requirements for lead-free assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Main 3–5.5 V supply rail; decoupled via external 100 nF capacitor near VCAP pin for stable core operation. |
| VSS | Ground reference | Digital ground return path; separate analog/digital grounding not required due to integrated noise suppression design. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts 1.2–5.5 V logic levels and supports external watchdog reset injection. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with HS capability; supports alternate functions including TIM1/2 channels, ADC inputs, and SPI/I²C signals. |
| PB0–PB7 | General-purpose I/O port B | 8-bit bidirectional port; includes LINUART TX/RX, SPI SCK/MOSI/MISO, and I²C SCL/SDA remappable pins. |
| PC0–PC7 | General-purpose I/O port C | 8-bit port with 10 HS pins across ports A/B/C; robust against current injection per ISO 10605 ESD testing. |
| PD0–PD7 | General-purpose I/O port D | 8-bit port supporting advanced timer complementary outputs (TIM1), CAPCOM inputs, and auto-wakeup timer trigger. |
| VCAP | Internal regulator bypass | Connects to 1 µF ceramic capacitor to stabilize internal 1.8 V core voltage; mandatory for reliable 16 MHz operation. |
Key Features
| Feature | Design Value |
|---|---|
| LIN 2.2-compliant UART | Integrated LIN master/slave with automatic resynchronization; eliminates need for external LIN transceiver in basic node designs. |
| Advanced Control Timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time insertion; enables 3-phase motor gate drive without external logic. |
| Low-power modes | Wait, Auto-wakeup, and Halt modes with configurable clock gating; reduces active current to 230 µA typical in Wait mode @ 16 MHz. |
| Flash & EEPROM protection | Read-out protection (ROP), write protection (WP), and user boot code (UBC) locking; prevents unauthorized firmware access or overwrite in field-deployed units. |
| Robust I/O design | I/Os withstand >200 mA current injection per pin per ISO 11452-4; ensures EMC resilience in noisy engine bay environments. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time monitoring of crankshaft position, throttle angle, and intake air temperature in gasoline direct injection systems. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop fuel injection and spark timing algorithms with sub-millisecond interrupt latency. Use Value: 16 MHz deterministic execution and 10-bit ADC with analog watchdog enable accurate combustion control under transient load conditions. |
Use Scenario: Centralized management of door locks, window lifts, interior lighting, and mirror adjustment in premium vehicles. IC Role / Device Role / Timing Role: LIN master coordinating communication with slave nodes (e.g., seat controllers, mirror modules) over single-wire bus. Use Value: Integrated LINUART with automatic resync maintains bus integrity during voltage dips and EMI events common in 12 V vehicle networks. |
| Transmission Control Unit (TCU) | Battery Management System (BMS) Sensor Node |
Use Scenario: Gear selection logic, solenoid driver timing, and torque converter clutch control in 6-speed automatic transmissions. IC Role / Device Role / Timing Role: High-reliability controller interfacing with PWM-driven solenoids and reading transmission fluid temperature/pressure sensors. Use Value: 150 °C operating rating and 300 kcycle EEPROM allow persistent storage of shift adaptation parameters across full vehicle lifetime. |
Use Scenario: Localized voltage, temperature, and current sensing at individual Li-ion cell groups in 12 V auxiliary battery packs. IC Role / Device Role / Timing Role: Signal conditioner and data aggregator transmitting calibrated ADC readings via I²C to main BMS host. Use Value: 10-channel 10-bit ADC with individual data buffers supports simultaneous sampling of multiple cell voltages without software overhead. |
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 |
|---|---|---|---|
| STM8AF6266TCYSSX | 32 Kbyte Flash, 2 Kbyte RAM, identical peripherals and package; higher memory for complex diagnostics or bootloader space. | Suitable for ECUs requiring dual-bank Flash for safe firmware updates or extended CAN/LIN gateway functionality. | Select when future firmware growth or ASAM-compliant diagnostic stacks demand >16 Kbyte program memory. |
| RL78/F13-BS | Renesas RL78 core, 32 Kbyte Flash, 2.7–5.5 V, −40 to 125 °C; lacks LIN 2.2 hardware but offers on-chip debug and lower active power. | Better fit for cost-sensitive cabin modules where LIN is implemented in software or omitted entirely. | Choose only if ambient temperature stays ≤125 °C and LIN hardware acceleration is non-critical. |
Compared with STM8AF6266TCYSSX, the STM8AF6246TCSSSX trades Flash capacity for smaller footprint and lower cost in fixed-function ECUs; versus RL78/F13-BS, it delivers superior high-temperature operation and integrated LIN hardware at marginally higher active current.
Availability
STM8AF6246TCSSSX is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control units requiring stable component supply across extended automotive production lifecycles.
Supply support for STM8AF6246TCSSSX 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 automotive microcontroller product line targets cost-optimized, high-reliability control applications in powertrain, chassis, and body electronics, emphasizing AEC-Q100 qualification, extended temperature operation, and functional safety readiness.
FAQ
What is the maximum junction temperature specification for STM8AF6246TCSSSX?
The device is qualified for operation at ambient temperatures from −40 to +150 °C per AEC-Q100 Grade 0. With θJA = 42 °C/W (VFQFPN32, 2-layer board), max junction temperature reaches 165 °C at 150 °C ambient and 350 mW dissipation - within absolute maximum rating of 175 °C.
Does STM8AF6246TCSSSX support in-circuit debugging via SWIM interface?
Yes, it features a Single Wire Interface Module (SWIM) compliant with ST's standard debug protocol. SWIM enables full-speed debugging, flash programming, and memory inspection using ST-LINK/V2 or compatible emulators without requiring additional pins beyond NRST and SWIM.
Can the internal 16 MHz RC oscillator be trimmed for improved accuracy?
Yes, the HSI oscillator includes a user-accessible trimming register (HSITRIM) allowing ±1% frequency adjustment in 0.5% steps. Factory-trimmed default value achieves ±2% accuracy over −40 to 125 °C, sufficient for LIN baud rate generation without external crystal.
How many I/O pins support high-speed (HS) operation and what is their drive strength?
10 I/O pins across ports A, B, and C are designated HS-capable, supporting 25 mA sink/source at VDD = 5 V with <10 ns rise/fall times. These pins are optimized for driving LEDs, small relays, or interfacing with high-speed peripherals like SPI flash.
STM8AF6246TCSSSX 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 ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF6246TCSSSX FAQ
1.How can I place an order for STM8AF6246TCSSSX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6246TCSSSX 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 STM8AF6246TCSSSX reliable?
The price and inventory of STM8AF6246TCSSSX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6246TCSSSX is usually 5 days.
3.What payment methods are accepted for STM8AF6246TCSSSX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6246TCSSSX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6246TCSSSX?
STM8AF6246TCSSSX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6246TCSSSX 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 STM8AF6246TCSSSX?
For technical support, including STM8AF6246TCSSSX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6246TCSSSX requirements.
6.How does Aetrix verify that STM8AF6246TCSSSX is sourced from the original manufacturer or authorized distributors?
All STM8AF6246TCSSSX 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 STM8AF6246TCSSSX meets industry standards.
7.What is the process for return or replacement of STM8AF6246TCSSSX?
All STM8AF6246TCSSSX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6246TCSSSX, 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 STM8AF6246TCSSSX part is unused and in its original packaging.
Return procedure for STM8AF6246TCSSSX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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