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STMicroelectronics STM8AF6246ITCX
- Part No.:
- STM8AF6246ITCX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM8AF6246ITCX.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,892
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Product details
Overview
STM8AF6246ITCX from STMicroelectronics is an AEC-Q100 qualified automotive-grade 8-bit MCU featuring a 16 MHz STM8A core, 8 Kbyte Flash memory with 20-year data retention at 55 °C, 640 byte true data EEPROM (300 kcycle endurance), and integrated 10-bit ADC with 7 muxed channels. It supports LIN 2.2 communication, SPI up to 8 Mbit/s, and I²C up to 400 Kbit/s, and operates across –40 to 150 °C for engine control unit (ECU) sensor interface applications.
For engineers reviewing the STM8AF6246ITCX datasheet, STM8AF6246ITCX pinout, STM8AF6246ITCX application, or STM8AF6246ITCX equivalent, key selection criteria include automotive temperature grade (–40 to 150 °C), LINUART compliance, high-sink I/O capability (21 pins), embedded EEPROM endurance, and AEC-Q100 qualification status.
Technical Context
The STM8AF6246ITCX implements a Harvard-architecture STM8A core with 3-stage pipeline and extended instruction set, enabling deterministic real-time execution in safety-critical automotive subsystems. Its clock system integrates trimmable 16 MHz RC and low-power 128 kHz RC oscillators, plus external crystal support and clock security monitoring.
Interrupt handling uses a nested controller supporting 32 interrupts and up to 28 external inputs on 7 vectors, while power management includes Wait, Auto-wakeup, and Halt modes with user-definable clock gating - critical for battery-sensitive body electronics and LIN node wake-up responsiveness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline and extended instruction set - enables deterministic timing for automotive control loops. |
| Max CPU Frequency | 16 MHz at VDD = 3.3–5.5 V - supports real-time LIN frame processing and ADC sampling within strict timing windows. |
| Flash Memory | 8 Kbyte program Flash with 20-year data retention at 55 °C after 1 kcycle - suitable for field-updatable ECU firmware with long service life. |
| Data EEPROM | 640 byte true data EEPROM, 300 kcycle endurance - retains calibration data, fault logs, and configuration parameters across vehicle lifetime. |
| ADC Resolution | 10-bit SAR ADC with ±1 LSB INL, 7 muxed input channels + 1 internal reference channel - enables precise analog sensor reading (e.g., coolant temp, throttle position). |
| LIN Compliance | LINUART module compliant with LIN 2.2 specification, supporting master/slave modes and automatic resynchronization - ensures interoperability in automotive sub-bus networks. |
| Operating Temperature | –40 °C to +150 °C - certified for under-hood deployment in engine management, transmission control, and exhaust systems. |
| I/O Drive Strength | Up to 21 high-sink output pins (20 mA sink per pin) - directly drives LEDs, relays, and discrete loads without external drivers in body control modules. |
Pinout & Package
LQFP32 (7 × 7 mm, 0.8 mm pitch) package with 32-pin layout optimized for automotive PCB routing and thermal dissipation in compact ECUs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains support robust noise immunity; VDD accepts 3.3–5.5 V for compatibility with legacy 5 V and modern 3.3 V automotive rails. |
| NRST | Active-low reset input | Integrated Schmitt trigger and programmable reset threshold enable reliable cold-cranking and brown-out recovery in 12 V battery environments. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7 | General-purpose I/O ports | 28 total I/Os including 21 high-sink outputs; configurable pull-ups/pull-downs and alternate functions (SPI/I²C/LIN) support flexible peripheral mapping. |
| OSC_IN / OSC_OUT | External crystal oscillator terminals | Supports 1–16 MHz crystals or external clock source - enables precise timing for LIN baud rate generation and ADC sampling synchronization. |
| SWIM | Single-wire interface for programming/debugging | Enables in-system programming and real-time debugging via single pin - reduces test fixture complexity during ECU manufacturing and validation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for operation from –40 °C to +150 °C - meets automotive powertrain reliability requirements without derating. |
| Embedded data EEPROM | 640 byte true EEPROM with 300 kcycle write endurance - eliminates need for external nonvolatile memory in cost-sensitive nodes like door modules. |
| Advanced control timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and dead-time insertion - enables direct driving of 3-phase motor gate drivers in HVAC blower control. |
| LIN 2.2 UART | Hardware-accelerated LIN transceiver with auto-resync and checksum generation - reduces CPU load and ensures protocol-compliant communication in body networks. |
| Low-power modes | Wait, Auto-wakeup, and Halt modes with clock gating - achieves sub-1 µA standby current for always-on LIN slave nodes in sleep mode. |
| Analog watchdog | Configurable threshold monitoring on ADC inputs - triggers interrupt on out-of-range sensor readings (e.g., overheating detection) without software polling. |
Applications
| Engine Coolant Temperature Monitoring | Body Control Module (BCM) Relay Driver |
|---|---|
|
Use Scenario: Real-time acquisition and linearization of NTC thermistor voltage in engine bay under thermal cycling. IC Role / Device Role / Timing Role: Primary sensor interface MCU with 10-bit ADC, internal reference, and analog watchdog - samples every 100 ms with ±1 °C accuracy over full temperature range. Use Value: Eliminates external signal conditioning and reference ICs; EEPROM stores calibration coefficients for lifetime drift compensation. |
Use Scenario: Driving 12 V relay coils and status LEDs in door latch, window lift, and lighting control circuits. IC Role / Device Role / Timing Role: High-sink I/O controller (21 pins @ 20 mA) with LIN interface - executes local logic and reports status via LIN bus to central BCM. Use Value: Reduces BOM count by integrating driver transistors; LIN 2.2 compliance ensures plug-and-play integration into existing vehicle networks. |
| Transmission Solenoid Control Node | Exhaust Gas Recirculation (EGR) Valve Position Feedback |
|
Use Scenario: Closed-loop PWM control of hydraulic solenoids in automatic transmission valve bodies. IC Role / Device Role / Timing Role: TIM1-based advanced timer generating complementary PWM with dead-time insertion - drives half-bridge gate drivers at 20 kHz with <100 ns jitter. Use Value: On-chip dead-time prevents shoot-through; 16 MHz core ensures deterministic update of duty cycle based on CAN/LIN commands. |
Use Scenario: Reading potentiometer feedback from EGR valve actuator and transmitting position data over LIN. IC Role / Device Role / Timing Role: ADC + LINUART co-processor - performs ratiometric measurement using internal VREF and transmits validated position packets every 20 ms. Use Value: Internal reference eliminates external precision voltage source; LIN framing and checksum offload reduce CPU overhead to <5%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8AF6226TAY | LQFP32 package, identical core/peripherals, but 4 Kbyte Flash and 384 byte EEPROM - lower memory capacity. | Suitable for simpler LIN slaves (e.g., mirror control) where firmware size and data logging depth are reduced. | Select when cost sensitivity outweighs need for full 8 Kbyte Flash or 640 byte EEPROM. |
| RL78/F13-BS | Renesas RL78 core, 24 MHz max, 32 Kbyte Flash, 4 Kbyte RAM, but no native LINUART - requires software LIN stack. | Used in higher-performance body ECUs requiring more RAM and Flash, but adds software certification burden for LIN compliance. | Choose only if migrating to Renesas ecosystem and accepting LIN stack validation effort. |
Compared with STM8AF6246ITCX, STM8AF6226TAY offers identical automotive qualification and peripheral set at lower memory cost, while RL78/F13-BS trades native LIN hardware for greater memory headroom and higher clock speed - demanding additional software validation for functional safety compliance.
Availability
STM8AF6246ITCX is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control nodes, and exhaust system sensors requiring stable component supply across automotive production lifecycles.
Supply support for STM8AF6246ITCX 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 devices, sensors, and analog ICs for automotive, industrial, and consumer markets.
The STM8AF series is ST's automotive-qualified 8-bit MCU product line, engineered specifically for cost-sensitive, high-reliability body and powertrain applications requiring AEC-Q100 Grade 0 operation and embedded nonvolatile memory.
FAQ
Is STM8AF6246ITCX pin-compatible with other STM8AF62xx variants?
Yes - STM8AF6246ITCX shares the LQFP32 pinout with STM8AF6226 and STM8AF6266, including identical power, reset, SWIM, and peripheral pin assignments. However, memory size and some option byte configurations differ, requiring firmware verification during substitution.
Does STM8AF6246ITCX support debug during runtime without halting execution?
No - it uses Single-Wire Interface Module (SWIM) for in-circuit debugging, which requires entering a debug mode that pauses CPU execution. Real-time trace or non-intrusive monitoring is not supported; developers rely on SWIM breakpoints and register inspection during halted states.
What is the maximum allowed VDD slew rate during power-up?
The datasheet specifies a minimum VDD ramp time of 1 ms from 0 to 2.4 V to ensure proper POR circuit activation. Exceeding 10 V/ms slew rate risks incomplete reset assertion and undefined register states, particularly affecting Flash and EEPROM controller initialization.
Can the internal 16 MHz RC oscillator meet LIN baud rate accuracy requirements?
Yes - the factory-trimmed 16 MHz RC oscillator achieves ±2 % accuracy over –40 to 125 °C, sufficient for LIN 2.2 slave-mode operation (±1.5 % tolerance). For master-mode or tighter timing, external crystal or ceramic resonator is recommended.
STM8AF6246ITCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-LQFP
- Series:
- STM8A
- Packaging:
- Tube
- 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:
STM8AF6246ITCX FAQ
1.How can I place an order for STM8AF6246ITCX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6246ITCX 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 STM8AF6246ITCX reliable?
The price and inventory of STM8AF6246ITCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6246ITCX is usually 5 days.
3.What payment methods are accepted for STM8AF6246ITCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6246ITCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6246ITCX?
STM8AF6246ITCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6246ITCX 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 STM8AF6246ITCX?
For technical support, including STM8AF6246ITCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6246ITCX requirements.
6.How does Aetrix verify that STM8AF6246ITCX is sourced from the original manufacturer or authorized distributors?
All STM8AF6246ITCX 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 STM8AF6246ITCX meets industry standards.
7.What is the process for return or replacement of STM8AF6246ITCX?
All STM8AF6246ITCX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6246ITCX, 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 STM8AF6246ITCX part is unused and in its original packaging.
Return procedure for STM8AF6246ITCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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