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STMicroelectronics STM8AF52A9TCX
- Part No.:
- STM8AF52A9TCX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM8AF52A9TCX.pdf
- Description:
- IC MCU 8BIT 128KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,611
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Product details
Overview
STM8AF52A9TCX 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 STM8AF52A9TCX datasheet, STM8AF52A9TCX pinout, STM8AF52A9TCX application, or STM8AF52A9TCX equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and power specifications, and confirmed alternative MCU options for CAN-enabled powertrain subsystems.
Technical Context
The STM8AF52A9TCX implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6 cycles/instruction average, achieving 10 MIPS at 16 MHz; its clock system integrates trimmable 16 MHz HSI and 128 kHz LSI oscillators plus external crystal support up to 24 MHz with clock security monitoring.
It integrates dual 16-bit general-purpose timers (each with up to 3 CAPCOM channels), an advanced control timer with dead-time insertion and complementary outputs, a 10-bit ADC (2 LSB TUE, 16-channel multiplexing), and LINUART supporting LIN 2.2 master/slave with automatic resynchronization - all operating across −40 °C to +150 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard CPU with 3-stage pipeline; enables deterministic interrupt latency and efficient code density for safety-critical automotive firmware. |
| Max fCPU | 24 MHz; supports real-time control loops with sub-μs instruction timing at full temperature range (−40 °C to +150 °C). |
| Flash Memory | 128 Kbyte Flash with 20-year data retention at 55 °C; allows field-upgradable firmware and robust storage of calibration tables. |
| Data EEPROM | 2 Kbyte true data EEPROM rated for 300 kcycles; provides wear-leveling-capable nonvolatile storage for runtime parameters without external components. |
| CAN Interface | CAN 2.0B compliant, 1 Mbit/s operation; meets ISO 11898-1 for high-speed communication in distributed vehicle networks. |
| ADC Resolution | 10-bit SAR ADC with 2 LSB total unadjusted error (TUE); delivers precise analog sensing for throttle position, coolant temperature, and oxygen sensors. |
| Operating Temperature | −40 °C to +150 °C; qualified per AEC-Q100 Grade 0 for under-hood engine management applications. |
Pinout & Package
LQFP80 package: 80-pin, 14 × 14 mm low-profile quad flat package with exposed thermal pad; RoHS-compliant, moisture sensitivity level (MSL) 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Supply voltage input | Primary 3–5.5 V power rail; decoupled via external 100 nF capacitor to ensure stable core and peripheral operation during transients. |
| VSS | Ground reference | Dedicated digital ground plane connection; separate from analog ground (VSSA) to minimize noise coupling into ADC and CAN PHY. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts external reset IC or microcontroller watchdog pulse for fail-safe system recovery. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with high sink capability (20 mA); configurable as ADC inputs, timer capture/compare, or LIN/CAN alternate functions. |
| PB0–PB7 | General-purpose I/O port B | 8-bit port supporting SPI MOSI/MISO/SCK, USART TX/RX, and CAN RX/TX remapping; includes Schmitt-trigger inputs for noisy environments. |
| PC0–PC7 | General-purpose I/O port C | 8-bit port with dedicated TIM1/2/3 channel mapping; enables PWM-driven motor control and synchronized capture of crankshaft/camshaft signals. |
| PD0–PD7 | General-purpose I/O port D | 8-bit port supporting I2C SDA/SCL, ADC external trigger, and auto-wakeup timer input; used for diagnostics and inter-ECU signaling. |
| PE0–PE7 | General-purpose I/O port E | 8-bit port with LINUART TX/RX and beeper output; supports LIN bus communication and audible feedback in service mode. |
| PF0–PF7 | General-purpose I/O port F | 8-bit port with CAN TX/RX and SWIM debug interface; enables in-system programming and real-time trace without dedicated JTAG pins. |
| PG0–PG7 | General-purpose I/O port G | 8-bit port supporting advanced timer complementary outputs and dead-time control; drives 3-phase inverter gate drivers directly. |
| VDDA/VSSA | Analog supply/ground | Isolated 3–5.5 V analog domain; powers ADC, internal RC oscillators, and CAN transceiver analog section to maintain signal integrity. |
| OSC_IN/OSC_OUT | Crystal oscillator terminals | Connects to 4–24 MHz quartz resonator; enables precise timing for CAN bit sampling and LIN baud rate generation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for −40 °C to +150 °C operation with extended reliability testing; eliminates need for derating in engine control modules. |
| Integrated CAN 2.0B controller | Hardware-accelerated message filtering, FIFO buffering, and error handling; reduces CPU load by >40% vs. software-implemented CAN stacks. |
| True data EEPROM | 2 Kbyte on-chip EEPROM with 300 kcycle endurance and automatic wear leveling; replaces external serial EEPROM in cost-sensitive ECUs. |
| Advanced control timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time insertion; enables direct drive of 3-phase BLDC motor inverters. |
| LIN 2.2-compliant LINUART | Hardware LIN master/slave with automatic resynchronization and checksum generation; supports diagnostic communication over single-wire bus without external transceiver. |
Applications
| Engine Control Unit (ECU) | Transmission Control Module (TCM) |
|---|---|
Use Scenario: Real-time acquisition of crankshaft position, camshaft timing, and manifold absolute pressure; closed-loop fuel injection and ignition timing calculation. IC Role / Device Role / Timing Role: Primary MCU executing ASAM-compliant control algorithms with deterministic 100 μs task scheduling and CAN-based actuator command broadcast. Use Value: 128 Kbyte Flash stores multiple calibration maps; CAN 2.0B ensures <100 μs latency for torque request synchronization between ECU and TCM. |
Use Scenario: Gear selection logic, solenoid valve PWM control, and hydraulic pressure regulation based on vehicle speed and throttle position inputs. IC Role / Device Role / Timing Role: Dedicated transmission controller interfacing with ECU via CAN and managing 6+ PWM outputs with synchronized dead-time control. Use Value: Advanced control timer (TIM1) drives 3-phase solenoid drivers directly; 10-bit ADC resolves pressure sensor signals to ±0.5% accuracy. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
Use Scenario: Centralized management of lighting, door locks, window lifts, and HVAC fan speed using LIN slave nodes and discrete I/O. IC Role / Device Role / Timing Role: System coordinator communicating with LIN slaves (e.g., mirror control, seat module) and relaying status over CAN to dashboard cluster. Use Value: LINUART hardware handles LIN 2.2 frame assembly/disassembly; 68 user I/O pins enable direct drive of 12+ relays and LEDs without glue logic. |
Use Scenario: Torque assist calculation, motor phase current sensing, and fault detection in brushless DC steering motors. IC Role / Device Role / Timing Role: Safety-oriented MCU performing ASIL-B-equivalent torque path monitoring with redundant ADC sampling and CAN fault reporting. Use Value: Dual 10-bit ADCs sample current shunts simultaneously; CAN interface reports torque assist status and faults to vehicle network within 5 ms. |
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 |
|---|---|---|---|
| STM8AF62A9TCX | No CAN interface; retains identical Flash/EEPROM, ADC, timers, and temperature rating. | Suitable for LIN-only body electronics where CAN is unnecessary. | Select when CAN bus connectivity is not required and BOM cost reduction is prioritized. |
| Infineon XC800CN-16F064L | 64 Kbyte Flash, no data EEPROM, 8-bit ADC (1 LSB INL), operates to +125 °C only. | Targeted at lower-tier BCMs with less stringent memory and temperature requirements. | Choose only if application fits reduced memory, lacks EEPROM dependency, and stays below 125 °C ambient. |
Compared with STM8AF52A9TCX, STM8AF62A9TCX removes CAN but maintains full functional parity elsewhere - ideal for LIN-centric systems - while XC800CN-16F064L trades Flash size, EEPROM, and temperature grade for lower unit cost in non-engine compartments.
Availability
STM8AF52A9TCX 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 automotive production lifecycles.
Supply support for STM8AF52A9TCX 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.
The STM8A automotive MCU product line targets cost-sensitive, high-reliability powertrain and chassis applications - delivering AEC-Q100 qualified 8-bit performance with integrated CAN, LIN, and robust analog peripherals in compact packages.
FAQ
What is the maximum operating junction temperature for STM8AF52A9TCX?
The device is qualified to AEC-Q100 Grade 0 with guaranteed operation from −40 °C to +150 °C ambient temperature. Its maximum junction temperature is 175 °C, validated under worst-case power dissipation and thermal resistance conditions (RθJA = 28 °C/W for LQFP80). Thermal design must maintain TJ ≤ 175 °C during continuous 24 MHz operation with all peripherals active.
Does STM8AF52A9TCX support in-circuit debugging without external hardware?
Yes - it features a Single Wire Interface Module (SWIM) accessible via dedicated PF0 (SWIM) and PF1 (NRST) pins. This allows full-speed debugging, flash programming, and real-time variable inspection using ST-LINK/V2 or compatible debug probes, eliminating the need for JTAG headers or additional boundary-scan circuitry.
How is CAN bus electrical compliance achieved without external transceivers?
The STM8AF52A9TCX contains only the CAN protocol controller (beCAN), not the physical layer transceiver. It requires an external CAN transceiver (e.g., TJA1042, SN65HVD230) connected to PF5 (CAN_RX) and PF6 (CAN_TX) pins. The MCU handles message filtering, arbitration, and error management; the transceiver manages differential signaling and bus termination.
Can the 2 Kbyte data EEPROM be used for storing cryptographic keys?
No - the on-chip data EEPROM is not secured against read-out or tampering. It lacks hardware encryption, write protection beyond option byte configuration, or secure boot enforcement. For key storage, external secure elements (e.g., STSAFE-A110) or flash-based encrypted storage with software obfuscation must be used instead.
STM8AF52A9TCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-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:
- 52
- 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:
STM8AF52A9TCX FAQ
1.How can I place an order for STM8AF52A9TCX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF52A9TCX 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 STM8AF52A9TCX reliable?
The price and inventory of STM8AF52A9TCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF52A9TCX is usually 5 days.
3.What payment methods are accepted for STM8AF52A9TCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF52A9TCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF52A9TCX?
STM8AF52A9TCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF52A9TCX 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 STM8AF52A9TCX?
For technical support, including STM8AF52A9TCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF52A9TCX requirements.
6.How does Aetrix verify that STM8AF52A9TCX is sourced from the original manufacturer or authorized distributors?
All STM8AF52A9TCX 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 STM8AF52A9TCX meets industry standards.
7.What is the process for return or replacement of STM8AF52A9TCX?
All STM8AF52A9TCX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF52A9TCX, 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 STM8AF52A9TCX part is unused and in its original packaging.
Return procedure for STM8AF52A9TCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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