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STMicroelectronics STM8AF52AATAX
- Part No.:
- STM8AF52AATAX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 80-LQFP
- Datasheet:
-
STM8AF52AATAX.pdf
- Description:
- IC MCU 8BIT 128KB FLASH 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,694
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Product details
Overview
STM8AF52AATAX 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 STM8AF52AATAX datasheet, STM8AF52AATAX pinout, STM8AF52AATAX application, or STM8AF52AATAX equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and power specifications, and confirmed alternative MCU options for CAN-based powertrain and body electronics designs.
Technical Context
The STM8AF52AATAX 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 up to 24 MHz with clock security monitoring.
It features a nested interrupt controller with 32 vectors and up to 37 external interrupts across 5 vectors, alongside dual 16-bit general-purpose timers (each with up to 3 CAPCOM channels), an advanced control timer with dead-time insertion and complementary outputs, and a 10-bit ADC with 2 LSB total unadjusted error and up to 16 multiplexed input channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic 1.6-cycle instruction execution for hard real-time automotive control loops. |
| Max fCPU | 24 MHz; supports time-critical CAN message handling and ADC sampling at full resolution without CPU bottleneck. |
| Flash Memory | 128 Kbyte Flash with 20-year data retention at 55 °C; sufficient for complex engine calibration tables and OTA update partitions. |
| Data EEPROM | 2 Kbyte true data EEPROM with 300 kcycle endurance; retains fault logs, mileage counters, and adaptive learning parameters across vehicle lifetime. |
| CAN Interface | High-speed CAN 2.0B compliant up to 1 Mbit/s; meets ISO 11898-2 physical layer requirements for powertrain network integration. |
| ADC Resolution | 10-bit with 2 LSB TUE and 1 LSB linearity; provides ±0.2% measurement accuracy for throttle position and coolant temperature sensing. |
| Operating Temperature | −40 °C to +150 °C; qualified for under-hood deployment in engine control modules per AEC-Q100 Grade 0. |
Pinout & Package
LQFP64 package: 64-pin, 10 × 10 mm low-profile quad flat package with exposed thermal pad; RoHS-compliant, moisture sensitivity level 3 (MSL3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual 3–5.5 V supply rails with dedicated analog/digital separation; supports stable ADC reference and CAN transceiver biasing. |
| PX0–PX7 (X = A–F) | General-purpose I/O | Up to 68 user pins including 11 high-sink I/Os; robust against current injection for direct solenoid/LED driver interfacing. |
| PA0–PA7 | ADC input / TIM1/2 channel / SPI/I2C alternate function | Hardware-mapped to 10-bit ADC inputs and timer capture/compare units; enables simultaneous analog sensing and PWM generation. |
| PD0–PD1 | CAN TX/RX | Dedicated differential CAN bus interface pins compliant with ISO 11898-2; require external CAN transceiver for physical layer connection. |
| PC3–PC4 | USART1 TX/RX | Full-duplex asynchronous communication interface supporting LIN 2.2 master/slave modes with automatic resynchronization. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for −40 °C to +150 °C operation with full electrical characterization across temperature and voltage extremes. |
| Integrated CAN 2.0B controller | On-chip protocol engine with message buffering, filtering, and error handling - eliminates need for external CAN protocol IC in ECU designs. |
| True data EEPROM | 2 Kbyte nonvolatile memory with 300 kcycle write endurance and hardware write protection - replaces external serial EEPROM in cost-sensitive 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. |
| Low-power modes | Wait, auto-wakeup, and Halt modes with user-definable clock gating; reduces current consumption to <1 μA in Halt mode for battery-backed wake-on-CAN. |
Applications
| Engine Control Unit (ECU) | Transmission Control Module (TCM) |
|---|---|
Use Scenario: Real-time processing of crankshaft/camshaft position signals, fuel injection timing, and spark advance calculation. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop combustion control algorithms with sub-microsecond interrupt latency and synchronized PWM output. Use Value: 24 MHz fCPU and deterministic 1.6-cycle instruction execution ensure jitter-free ignition timing; CAN interface enables seamless coordination with other powertrain ECUs. |
Use Scenario: Monitoring gear selector position, turbine speed, and hydraulic pressure to manage shift scheduling and clutch engagement. IC Role / Device Role / Timing Role: Central controller managing solenoid drivers via advanced timer outputs and reading analog pressure sensors through 10-bit ADC. Use Value: High-sink I/Os directly drive transmission solenoids; 2 Kbyte EEPROM stores adaptive shift maps calibrated over vehicle lifetime. |
| Body Control Module (BCM) | Electric Power Steering (EPS) Assist Controller |
Use Scenario: Consolidating door lock, window lift, lighting, and HVAC fan control into a single domain controller. IC Role / Device Role / Timing Role: System-level coordinator communicating via LIN and CAN buses while managing multiple PWM-controlled loads. Use Value: Integrated LINUART supports LIN 2.2 master/slave with automatic resynchronization - simplifies wiring harness and reduces slave node BOM cost. |
Use Scenario: Torque assist computation using torque sensor feedback and vehicle speed, driving three-phase motor via gate drivers. IC Role / Device Role / Timing Role: Safety-critical motor controller implementing ASIL-B functional safety logic with watchdog supervision and redundant ADC sampling. Use Value: Advanced control timer (TIM1) delivers precise dead-time controlled complementary PWM outputs; AEC-Q100 Grade 0 ensures reliability in steering column environment. |
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 |
|---|---|---|---|
| STM8AF528ATAY | Same 128 Kbyte Flash, 2 Kbyte EEPROM, and CAN interface; differs in LQFP48 (7×7 mm) package and reduced I/O count (48 pins vs. 64). | Suitable for space-constrained BCM or junction box modules where full 68-pin I/O is unnecessary. | Select when PCB area is limited and peripheral count allows reduction - no firmware change required due to identical memory map and peripheral register layout. |
| STM32F042F6P6 | 32-bit ARM Cortex-M0 core, 32 Kbyte Flash, no integrated CAN controller (requires external transceiver + software stack), operates up to 48 MHz. | Better suited for applications needing higher computational throughput or USB connectivity, but increases CAN software complexity and BOM cost. | Choose only if migrating to 32-bit architecture is justified by algorithmic complexity; not drop-in compatible - requires full HAL migration and CAN driver reimplementation. |
Compared with STM8AF52AATAX, STM8AF528ATAY offers identical functionality in smaller footprint for cost-optimized modules, while STM32F042F6P6 trades CAN hardware integration for raw performance - making the STM8AF52AATAX optimal for CAN-centric, safety-critical automotive control where deterministic timing and minimal external components are mandatory.
Availability
STM8AF52AATAX is available at Aetrix Electronics and suitable for engine control units, transmission control modules, body control modules, and electric power steering systems requiring stable component supply across extended automotive product lifecycles.
Supply support for STM8AF52AATAX 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 STM8A automotive MCU product line targets cost-sensitive, high-reliability embedded control applications - specifically engineered for AEC-Q100 compliance, extended temperature operation, and on-chip functional safety features required in powertrain and chassis systems.
FAQ
What is the maximum operating frequency and corresponding supply voltage range for STM8AF52AATAX?
The STM8AF52AATAX achieves a maximum CPU frequency of 24 MHz at VDD = 4.5–5.5 V. At lower supply voltages (3.0–4.5 V), maximum fCPU is reduced to 16 MHz per the fCPUmax vs. VDD curve in Section 10.3.1. Operation below 3.0 V is not guaranteed and may cause Flash access errors or reset instability.
Does STM8AF52AATAX include hardware support for LIN communication?
Yes - it integrates a LINUART peripheral compliant with LIN 2.2 specification, supporting both master and slave modes with automatic resynchronization. This eliminates external UART-to-LIN bridge ICs and enables direct connection to LIN transceivers such as TLE7259-3GE.
How is CAN bus physical layer interfacing implemented with STM8AF52AATAX?
The STM8AF52AATAX contains a CAN 2.0B protocol controller only - it requires an external CAN transceiver (e.g., TJA1042T/3) connected to PD0 (CAN_TX) and PD1 (CAN_RX) pins. The MCU handles message framing, filtering, and error handling; the transceiver manages differential signaling and bus arbitration.
What debug interface does STM8AF52AATAX support, and what tools are compatible?
It uses the Single Wire Interface Module (SWIM) for programming and debugging - supported by ST-LINK/V2 and ST-LINK/V2-1 debug probes, STM8 eForth IDE, and ST's Cosmic C compiler toolchain. SWIM operates over a single pin (SWIM) and requires no dedicated JTAG header, reducing PCB routing complexity.
STM8AF52AATAX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 80-LQFP
- Series:
- STM8A
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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:
- 68
- 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 16x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF52AATAX FAQ
1.How can I place an order for STM8AF52AATAX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF52AATAX 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 STM8AF52AATAX reliable?
The price and inventory of STM8AF52AATAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF52AATAX is usually 5 days.
3.What payment methods are accepted for STM8AF52AATAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF52AATAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF52AATAX?
STM8AF52AATAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF52AATAX 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 STM8AF52AATAX?
For technical support, including STM8AF52AATAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF52AATAX requirements.
6.How does Aetrix verify that STM8AF52AATAX is sourced from the original manufacturer or authorized distributors?
All STM8AF52AATAX 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 STM8AF52AATAX meets industry standards.
7.What is the process for return or replacement of STM8AF52AATAX?
All STM8AF52AATAX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF52AATAX, 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 STM8AF52AATAX part is unused and in its original packaging.
Return procedure for STM8AF52AATAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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