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STMicroelectronics STM8AF52A8TCX
- Part No.:
- STM8AF52A8TCX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM8AF52A8TCX.pdf
- Description:
- IC MCU 8BIT 128KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,932
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Product details
Overview
STM8AF52A8TCX from STMicroelectronics is an AEC-Q100 Grade 0 qualified automotive 8-bit microcontroller featuring a 24 MHz STM8A core, 128 Kbyte Flash program memory with 20-year data retention at 55 °C, 2 Kbyte true data EEPROM (300 kcycle endurance), and integrated CAN 2.0B interface operating up to 1 Mbit/s - deployed in engine control units for real-time sensor signal acquisition and actuator command execution.
For engineers reviewing the STM8AF52A8TCX datasheet, STM8AF52A8TCX pinout, STM8AF52A8TCX application, or STM8AF52A8TCX equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and power specifications, and confirmed alternative options for CAN-enabled ECU designs.
Technical Context
The device implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6 cycles/instruction average, achieving 10 MIPS at 16 MHz. It integrates dual clock domains: a user-trimmable 16 MHz RC oscillator and a low-power 128 kHz RC oscillator, both monitored by a dedicated clock security system (CSS) with fail-safe reset.
Its peripheral set includes an advanced control timer with dead-time insertion and complementary outputs for motor gate driving, a 10-bit ADC with ±2 LSB total unadjusted error and up to 16 multiplexed inputs, and LINUART supporting automatic resynchronization in master/slave modes per LIN 2.2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic interrupt latency and efficient code density for safety-critical automotive firmware. |
| Max fCPU | 24 MHz at 3–5.5 V supply; supports real-time control loops with sub-42 ns instruction cycle time. |
| Flash Memory | 128 Kbyte on-chip Flash with 20-year data retention at 55 °C; allows field-upgradable firmware without external storage. |
| Data EEPROM | 2 Kbyte true data EEPROM with 300 kcycle endurance; stores calibration parameters and fault logs across vehicle lifetime. |
| CAN Interface | High-speed CAN 2.0B compliant up to 1 Mbit/s; meets ISO 11898-1 for robust in-vehicle network communication. |
| ADC Resolution | 10-bit SAR ADC with ±2 LSB TUE and 1 LSB linearity; provides accurate analog sensor readings (e.g., throttle position, coolant temp). |
| Operating Temp | −40 °C to +150 °C ambient; qualified for under-hood deployment in engine management systems. |
| AEC-Q100 Grade | Grade 0 per AEC-Q100 Rev H; certified for automotive applications requiring highest reliability and thermal robustness. |
Pinout & Package
LQFP64 package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant, with exposed thermal pad for enhanced heat dissipation in high-temperature engine bay environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual 3–5.5 V supply domain with dedicated VCAP decoupling capacitor support for stable core voltage regulation. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; supports external watchdog or microcontroller-initiated system recovery. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7, PF0–PF7 | General-purpose I/O ports | Up to 68 user pins with high sink capability (11 I/Os rated ≥20 mA); immune to current injection per ISO 10605. |
| CAN_RX / CAN_TX | CAN physical layer interface | Differential bus signals compliant with ISO 11898-2; require external transceiver (e.g., TJA1042) for full node implementation. |
| OSC_IN / OSC_OUT | External crystal oscillator connection | Supports 1–24 MHz crystal or ceramic resonator; enables precise timing for CAN bit rate accuracy and LIN synchronization. |
| SWIM | Single-wire interface for debug and programming | Enables in-system programming and real-time debugging via single-pin connection, reducing PCB routing complexity. |
Key Features
| Feature | Design Value |
|---|---|
| Advanced Control Timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time insertion - enables 3-phase motor control without external logic. |
| LINUART Module | Fully LIN 2.2-compliant with automatic resynchronization and master/slave mode switching - eliminates need for external LIN transceiver in slave-only nodes. |
| Low-Power Modes | Wait, Auto-Wakeup, and Halt modes with configurable clock gating; reduces current to ≤1.5 µA in Halt with RAM retention for battery-sensitive modules. |
| Flash Security | Read-out protection (ROP), write protection (WP), and user boot code (UBC) lock - prevents unauthorized firmware extraction or overwrite in production ECUs. |
| Robust I/O Design | I/Os withstand >5000 V HBM ESD and resist current injection up to 100 mA - ensures reliability in noisy automotive harness environments. |
Applications
| Engine Control Unit (ECU) | Transmission Control Module (TCM) |
|---|---|
Use Scenario: Real-time acquisition of crankshaft position, camshaft timing, and oxygen sensor signals; closed-loop fuel injection and ignition timing calculation. IC Role / Device Role / Timing Role: Primary MCU executing ASAM-defined control algorithms with deterministic 100 µs interrupt response for spark advance computation. Use Value: Integrated CAN and LIN interfaces enable direct communication with dashboard cluster and body control module without protocol bridge ICs. |
Use Scenario: Monitoring gear selector position, turbine speed, and hydraulic pressure sensors; actuating solenoid valves for shift control and torque converter lockup. IC Role / Device Role / Timing Role: Safety-critical controller managing ASIL-B-relevant functions with independent watchdog timers and clock monitoring. Use Value: 150 °C operating temperature rating permits placement inside transmission housing, eliminating remote mounting and long harness runs. |
| Electric Power Steering (EPS) | Brake-by-Wire Actuator Controller |
Use Scenario: Sampling torque sensor and motor phase currents; generating PWM gate drive signals for 3-phase BLDC assist motor. IC Role / Device Role / Timing Role: Motor control MCU using TIM1's complementary outputs and dead-time insertion to prevent shoot-through in inverter stage. Use Value: On-chip 10-bit ADC with hardware-triggered sampling synchronizes current measurement precisely with PWM edges for accurate FOC. |
Use Scenario: Receiving brake pedal travel and pressure commands over CAN; validating redundancy paths and driving electro-hydraulic valve actuators. IC Role / Device Role / Timing Role: Dual-core redundant monitor (via SWIM + internal watchdog chain) ensuring fail-operational behavior per ISO 26262 ASIL-D decomposition. Use Value: AEC-Q100 Grade 0 qualification and 300 kcycle EEPROM endurance guarantee reliable storage of diagnostic trouble codes across 15+ year vehicle service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive 8-bit MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8AF62A8TCX | No CAN interface; retains identical Flash/EEPROM/RAM, 150 °C rating, and LINUART. | Suitable for LIN-only body electronics (e.g., seat control, mirror adjustment) where CAN bus integration is unnecessary. | Select when CAN PHY layer and associated EMC filtering can be omitted to reduce BOM cost and PCB area. |
| Infineon XC800CNL-16F64L | 8-bit CISC core, 26 MHz max, 64 Kbyte Flash, no integrated LINUART, requires external LIN transceiver. | Used in cost-sensitive lighting control modules with basic CAN messaging but no LIN slave functionality. | Choose only if legacy XC800 toolchain compatibility and pin-for-pin replacement in existing designs are required. |
Compared with STM8AF52A8TCX, STM8AF62A8TCX removes CAN while preserving all other automotive peripherals and temperature rating - ideal for LIN-centric subsystems; XC800CNL-16F64L offers lower Flash density and lacks LINUART, necessitating external components for LIN compliance and increasing system-level validation effort.
Availability
STM8AF52A8TCX is available at Aetrix Electronics and suitable for engine control units, transmission control modules, electric power steering systems, and brake-by-wire actuators requiring stable component supply across extended automotive product lifecycles.
Supply support for STM8AF52A8TCX 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 management ICs, sensors, and automotive-grade silicon for industrial and transportation markets.
This device belongs to the STM8A automotive MCU product line, engineered specifically for ASIL-B and ASIL-C functional safety applications in powertrain, chassis, and body electronics - emphasizing thermal resilience, on-chip diagnostics, and long-term supply assurance.
FAQ
Does STM8AF52A8TCX support bootloader updates over CAN?
Yes. The device includes a ROM-based CAN bootloader accessible via specific message IDs defined in ST Application Note AN2606. It supports reprogramming of Flash memory without external debugger, provided the application firmware reserves memory space and configures CAN RX FIFO for bootloader entry detection.
What is the maximum allowed VDD slew rate during power-up?
The datasheet specifies a minimum VDD ramp time of 1 ms from 0 V to 2.4 V to ensure proper internal power-on reset (POR) circuit operation. Exceeding 10 V/ms slew rate may cause metastability in reset assertion and lead to undefined register states or Flash corruption during initialization.
Can the 128 kHz LSI oscillator be used as the system clock source?
No. The 128 kHz LSI oscillator is restricted to use as the auto-wakeup timer clock and independent watchdog (IWDG) clock source. System clock (fCPU) must derive from HSE, HSI, or PLL output; attempting to route LSI to CLK_CMSR causes immediate clock security system (CSS) reset.
Is SWIM pin multiplexed with any GPIO function?
Yes. The SWIM pin (pin 11 in LQFP64) is shared with PA1, but only when SWIM is disabled via option byte configuration. In default state, SWIM is active and PA1 is unavailable as general-purpose I/O; enabling PA1 requires permanently disabling SWIM, forfeiting in-circuit debugging capability.
STM8AF52A8TCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-LQFP
- Series:
- STM8A
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- STM8A
- Core Size:
- 8-Bit
- Speed:
- 24MHz
- Connectivity:
- CANbus, I2C, LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 38
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 6K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 10x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF52A8TCX FAQ
1.How can I place an order for STM8AF52A8TCX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF52A8TCX 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 STM8AF52A8TCX reliable?
The price and inventory of STM8AF52A8TCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF52A8TCX is usually 5 days.
3.What payment methods are accepted for STM8AF52A8TCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF52A8TCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF52A8TCX?
STM8AF52A8TCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF52A8TCX 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 STM8AF52A8TCX?
For technical support, including STM8AF52A8TCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF52A8TCX requirements.
6.How does Aetrix verify that STM8AF52A8TCX is sourced from the original manufacturer or authorized distributors?
All STM8AF52A8TCX 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 STM8AF52A8TCX meets industry standards.
7.What is the process for return or replacement of STM8AF52A8TCX?
All STM8AF52A8TCX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF52A8TCX, 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 STM8AF52A8TCX part is unused and in its original packaging.
Return procedure for STM8AF52A8TCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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