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STMicroelectronics STM8AF52AATCX
- Part No.:
- STM8AF52AATCX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 80-LQFP
- Datasheet:
-
STM8AF52AATCX.pdf
- Description:
- IC MCU 8BIT 128KB FLASH 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,071
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Product details
Overview
STM8AF52AATCX 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, LIN, USART, SPI, I²C, and 10-bit ADC. It operates from 3 to 5.5 V across –40 °C to 150 °C and targets engine control units, body electronics, and powertrain sensors.
For engineers reviewing the STM8AF52AATCX datasheet, STM8AF52AATCX pinout, STM8AF52AATCX application, or STM8AF52AATCX equivalent, key selection criteria include CAN/LIN coexistence, high-temperature operation up to 150 °C, Flash/E²PROM endurance specs, and AEC-Q100 Grade 0 qualification for under-hood deployment.
Technical Context
The device implements a Harvard-architecture STM8A core with 3-stage pipeline and average 1.6 cycles/instruction throughput, delivering 10 MIPS at 16 MHz. Its clock system integrates trimmable 16 MHz HSI and 128 kHz LSI RC oscillators plus external crystal support, all monitored by a dedicated clock security system (CSS).
Peripheral integration includes a CAN 2.0B controller compliant with ISO 11898-1, LINUART supporting LIN 2.2 master/slave with automatic resynchronization, and a 10-bit ADC with 2 LSB total unadjusted error and up to 16 multiplexed channels - all operating reliably within the extended automotive temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic real-time response in safety-critical automotive functions. |
| Max CPU Frequency | 24 MHz; supports time-critical control loops such as fuel injection timing or motor phase commutation. |
| Flash Memory | 128 Kbyte; retains firmware for 20 years at 55 °C, suitable for long-lifecycle vehicle platforms. |
| Data EEPROM | 2 Kbyte true EEPROM; withstands 300,000 write/erase cycles for odometer, calibration, or fault log storage. |
| CAN Interface | High-speed 1 Mbit/s CAN 2.0B; enables robust communication with ECUs in distributed automotive networks. |
| Operating Temperature | –40 °C to +150 °C; certified per AEC-Q100 Grade 0, validated for under-hood placement near engines or transmissions. |
| ADC Resolution | 10-bit with 2 LSB TUE; provides sufficient accuracy for analog sensor inputs like throttle position or coolant temperature. |
| Supply Voltage Range | 3.0 V to 5.5 V; accommodates wide battery voltage swings in 12 V automotive systems during cranking or load dump. |
Pinout & Package
LQFP64 package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 3–5.5 V supply rail; requires local 100 nF ceramic decoupling adjacent to pin. |
| VSS | Ground reference | Digital ground return; must be connected to low-impedance PCB plane for noise immunity. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts 1.2 V logic threshold for compatibility with 3.3 V or 5 V systems. |
| PA0–PA7 | General-purpose I/O port A | Up to 8 configurable pins with high-sink capability (20 mA); support alternate functions including TIM1, ADC, and SPI. |
| PB0–PB7 | General-purpose I/O port B | Includes CAN_RX (PB0) and CAN_TX (PB1); supports remappable peripheral functions via option bytes. |
| PC0–PC7 | General-purpose I/O port C | Hosts LINUART TX/RX (PC3/PC4), I²C SCL/SDA (PC5/PC6), and ADC channel inputs. |
| PD0–PD7 | General-purpose I/O port D | Provides USART1 TX/RX (PD5/PD6), SPI NSS/SCK/MOSI/MISO (PD3–PD0), and timer capture/compare signals. |
| PE0–PE7 | General-purpose I/O port E | Supports advanced timer complementary outputs (TIM1 CH1–CH3), PWM generation, and dead-time insertion control. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for continuous operation at 150 °C ambient; eliminates derating requirements in high-temp zones. |
| Integrated CAN 2.0B + LIN 2.2 | Single-chip dual-bus support enables cost-effective gateway or node functionality without external transceivers beyond physical layer. |
| True data EEPROM (2 Kbyte) | Eliminates need for external serial EEPROM in applications requiring frequent nonvolatile parameter updates (e.g., adaptive learning). |
| Advanced control timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and hardware dead-time insertion - ideal for 3-phase motor control. |
| Low-power modes with clock gating | Wait, auto-wakeup, and Halt modes reduce current to <1 μA (Halt) while preserving RAM and register state for fast wake-up. |
| SWIM single-wire debug interface | Enables full in-circuit debugging and programming using only one pin - simplifies PCB layout and reduces test point count. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Real-time management of fuel injection timing, ignition spark advance, and air-fuel ratio feedback using analog sensor inputs and PWM-driven actuators. IC Role / Device Role / Timing Role: Primary controller executing closed-loop combustion control algorithms with sub-millisecond interrupt latency and deterministic CAN message scheduling. Use Value: Integrated 10-bit ADC with 16-channel mux and advanced timer with dead-time insertion directly support precise injector driver timing and knock detection signal conditioning. |
Use Scenario: Centralized control of door locks, window lifts, lighting sequences, and HVAC fan speed in passenger compartments. IC Role / Device Role / Timing Role: System coordinator interfacing with LIN slave nodes (e.g., mirror controls, seat modules) and managing local I/O via high-sink GPIOs. Use Value: On-chip LINUART with automatic resynchronization tolerates bus timing drift across multiple slaves, reducing software overhead and improving network reliability. |
| Transmission Control Unit (TCU) | Electric Power Steering (EPS) |
|
Use Scenario: Gear shift logic, clutch engagement control, and torque converter lock-up management using CAN-based vehicle speed and throttle position inputs. IC Role / Device Role / Timing Role: Safety-relevant controller handling ASIL-B–level functions with watchdog supervision, clock monitoring, and memory ECC (via software-implemented CRC). Use Value: AEC-Q100 Grade 0 rating ensures uninterrupted operation at transmission housing temperatures exceeding 135 °C during sustained highway driving. |
Use Scenario: Torque assist calculation, motor phase commutation, and fault detection in brushless DC steering motors using Hall-effect or encoder feedback. IC Role / Device Role / Timing Role: Motor control unit generating synchronized 3-phase PWM waveforms with programmable dead time and emergency shutdown capability. Use Value: TIM1's hardware dead-time insertion prevents shoot-through in inverter bridges, eliminating risk of MOSFET short-circuit failure during rapid direction changes. |
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 |
|---|---|---|---|
| STM8AF62AATCX | No CAN interface; retains LIN, UART, SPI, I²C, 128 KB Flash, and 150 °C rating. | Suitable for LIN-only body electronics where CAN is unnecessary, reducing BOM cost and EMI complexity. | Select when CAN bus connectivity is not required and cost optimization is prioritized over protocol flexibility. |
| RL78/F13 | Renesas RL78 core; 32 MHz max, 128 KB Flash, 10-bit ADC, CAN 2.0B, but rated only to 125 °C (AEC-Q100 Grade 1). | Applicable in cabin or chassis modules where ambient temperature remains below 125 °C, such as infotainment gateways or suspension controllers. | Choose if toolchain familiarity with RL78 ecosystem outweighs need for Grade 0 thermal margin. |
Compared with STM8AF62AATCX, the STM8AF52AATCX adds essential CAN 2.0B for powertrain networking, while RL78/F13 offers higher clock speed but sacrifices 25 °C of operational margin - making STM8AF52AATCX the only choice for direct engine bay mounting.
Availability
STM8AF52AATCX is available at Aetrix Electronics and suitable for engine control units, transmission control modules, electric power steering systems, and body control modules requiring stable component supply across extended automotive lifecycles.
Supply support for STM8AF52AATCX 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 components.
The STM8A product line delivers cost-optimized, AEC-Q100 qualified 8-bit MCUs targeting resource-constrained automotive subsystems where functional safety, thermal resilience, and long-term supply stability are mandatory.
FAQ
Does STM8AF52AATCX support SWD or JTAG debugging?
No. STM8AF52AATCX uses ST's proprietary Single Wire Interface Module (SWIM) for debugging and programming, requiring only one dedicated pin (SWIM) and NRST. It does not implement ARM-standard SWD or JTAG interfaces, and ST-LINK/V2-ISO or ST-LINK/V2 programmers are required for development.
What is the maximum allowed VDD transient during load dump?
The absolute maximum rating for VDD is 6.0 V (per Section 10.2 of DocID14395 Rev 15). During ISO 7637-2 Load Dump Pulse 5a, external TVS clamping is mandatory to limit voltage at the VDD pin to ≤6.0 V; the device lacks on-chip overvoltage protection beyond this rating.
Can the internal 16 MHz RC oscillator be used for CAN bit timing?
No. CAN bit timing requires ±1% clock accuracy over temperature and voltage; the trimmed 16 MHz HSI achieves ±2% over –40 °C to 150 °C (Section 10.3.4). A crystal-based HSE or external clock source meeting ISO 11898-1 oscillator tolerance is required for reliable CAN operation.
Is the data EEPROM wear-leveling handled in hardware or software?
Wear-leveling is implemented entirely in software. The STM8AF52AATCX provides true EEPROM cells with 300 kcycle endurance per byte, but no hardware wear-leveling engine. Application firmware must manage logical-to-physical address mapping and block rotation to extend effective lifetime beyond 300 kcycles.
STM8AF52AATCX 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 ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF52AATCX FAQ
1.How can I place an order for STM8AF52AATCX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF52AATCX 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 STM8AF52AATCX reliable?
The price and inventory of STM8AF52AATCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF52AATCX is usually 5 days.
3.What payment methods are accepted for STM8AF52AATCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF52AATCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF52AATCX?
STM8AF52AATCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF52AATCX 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 STM8AF52AATCX?
For technical support, including STM8AF52AATCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF52AATCX requirements.
6.How does Aetrix verify that STM8AF52AATCX is sourced from the original manufacturer or authorized distributors?
All STM8AF52AATCX 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 STM8AF52AATCX meets industry standards.
7.What is the process for return or replacement of STM8AF52AATCX?
All STM8AF52AATCX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF52AATCX, 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 STM8AF52AATCX part is unused and in its original packaging.
Return procedure for STM8AF52AATCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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