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STMicroelectronics STM8AF52A8TDX
- Part No.:
- STM8AF52A8TDX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM8AF52A8TDX.pdf
- Description:
- IC MCU 8BIT 128KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,844
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Product details
Overview
STM8AF52A8TDX 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 STM8AF52A8TDX datasheet, STM8AF52A8TDX pinout, STM8AF52A8TDX application, or STM8AF52A8TDX equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and I/O specifications, and confirmed drop-in alternatives for ECU and body electronics design.
Technical Context
The device implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6 cycles/instruction average, delivering 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 automatic failover detection.
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 across 16 channels, and LINUART supporting LIN 2.2 master/slave with automatic resynchronization - all operating within -40 °C to +150 °C ambient temperature range.
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 VDD = 3–5.5 V; supports real-time control loops with sub-μs instruction timing in engine management applications. |
| Flash Memory | 128 Kbyte on-chip Flash with 20-year data retention at 55 °C; allows field-upgradable firmware without external memory in telematics modules. |
| Data EEPROM | 2 Kbyte true data EEPROM with 300 kcycle endurance; stores calibration parameters and fault logs across vehicle lifetime without wear leveling. |
| CAN Interface | CAN 2.0B compliant, 1 Mbit/s max bit rate; meets ISO 11898-1 for robust communication in powertrain networks with bus fault tolerance. |
| ADC Resolution | 10-bit SAR ADC with ±2 LSB TUE and 1 LSB linearity; provides sufficient accuracy for throttle position and coolant temperature sensing. |
| Operating Temp | -40 °C to +150 °C ambient; certified for under-hood deployment in gasoline/diesel ECUs per AEC-Q100 Grade 0 requirements. |
Pinout & Package
LQFP64 package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant, with exposed thermal pad for enhanced heat dissipation in high-temperature automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual VDD pins (Pins 1, 64) and multiple VSS (Pins 2, 3, 63) ensure stable core voltage under load transients in ignition systems. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7 | General-purpose I/O ports | 64 total I/Os including 11 high-sink (20 mA) pins; support direct LED drive and relay control without external buffers. |
| PD0/PD1 | CAN TX/RX | Dedicated differential CAN transceiver interface pins; internally routed to beCAN peripheral with slew-rate control for EMC compliance. |
| PA3/PA4 | USART1 TX/RX | Full-duplex asynchronous serial interface supporting bootloader updates via diagnostic port (K-Line compatible). |
| PC3/PC4 | LINUART TX/RX | Single-wire LIN physical layer interface with automatic baud rate resynchronization for body control modules. |
| PF0–PF3 | ADC input channels | Four dedicated analog inputs (ADC1_IN0–ADC1_IN3); support multiplexed sampling of up to 16 channels via internal routing. |
| NRST | Active-low reset | Asynchronous reset pin with internal pull-up; accepts external watchdog or power monitor assertion for fail-safe shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for continuous operation at 150 °C junction temperature - required for engine bay MCU placement without heatsinking. |
| Embedded CAN 2.0B controller | Hardware message filtering, 16 message objects, and automatic retransmission reduce CPU overhead in multi-node powertrain networks. |
| True data EEPROM | Independent 2 Kbyte nonvolatile memory block with separate erase/write cycles - eliminates need for external 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 3-phase inverter control in electric power steering. |
| SWIM debug interface | Single-wire in-circuit debugging using only NRST pin; supports full-speed halt, step, and memory inspection without dedicated debug pins. |
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 spark timing calculation. IC Role / Device Role / Timing Role: Primary MCU executing deterministic control algorithms with sub-100 μs interrupt response; synchronizes PWM outputs to ignition coils and injectors. Use Value: Integrated 10-bit ADC with hardware oversampling and CAN interface enable precise combustion optimization while meeting ISO 26262 ASIL-B functional safety requirements. |
Use Scenario: Monitoring gear selector position, turbine speed, and hydraulic pressure; managing solenoid valve sequencing and torque converter lockup. IC Role / Device Role / Timing Role: Central controller coordinating shift logic, PID-based pressure regulation, and CAN-based communication with ECU and ABS modules. Use Value: 128 Kbyte Flash supports dual-bank firmware for safe over-the-air updates; high-temp rating ensures reliability in transmission oil-cooled mounting locations. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
Use Scenario: Managing door locks, window lifters, interior lighting, and LIN-connected sensors (e.g., rain/light sensors). IC Role / Device Role / Timing Role: LIN master node polling slave devices; handles wake-up events via CAN or LIN bus activity; executes low-power sleep/wake cycles. Use Value: LINUART with automatic resynchronization tolerates voltage fluctuations on shared vehicle wiring; 68 I/Os consolidate discrete logic into single-chip solution. |
Use Scenario: Sampling torque sensor, motor phase currents, and temperature; generating space-vector PWM for brushless assist motor. IC Role / Device Role / Timing Role: Real-time motor controller with advanced timer (TIM1) generating complementary PWM with dead-time; ADC synchronized to PWM zero-crossing. Use Value: Hardware dead-time insertion prevents shoot-through in H-bridge drivers; CAN interface enables torque request coordination with vehicle stability systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8AF62A8TDX | No CAN interface; retains identical Flash/EEPROM, ADC, timers, and temperature rating. | Suitable for LIN-only or SPI/I2C-based body electronics where CAN is not required. | Select when CAN is unnecessary - reduces BOM cost and simplifies EMC layout without sacrificing compute or analog capability. |
| MC9S08DZ60CLH | Freescale S08 core (20 MHz max), 60 Kbyte Flash, no embedded EEPROM, requires external LIN transceiver. | Legacy platform with mature toolchain but limited memory scalability and no integrated EEPROM for calibration storage. | Choose only for legacy redesign continuity; lacks STM8AF52A8TDX's data retention guarantee and CAN integration. |
Compared with STM8AF62A8TDX, the STM8AF52A8TDX adds essential CAN connectivity for powertrain networks, while MC9S08DZ60CLH offers lower memory and no on-chip EEPROM - making STM8AF52A8TDX the optimal choice for new AEC-Q100 Grade 0 designs requiring integrated nonvolatile storage and CAN.
Availability
STM8AF52A8TDX 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 lifecycles.
Supply support for STM8AF52A8TDX 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 silicon for industrial and transportation markets.
The STM8A product line targets cost-sensitive, high-reliability automotive applications - delivering AEC-Q100 qualified 8-bit MCUs with integrated analog peripherals, CAN/LIN interfaces, and extended temperature operation for ECU, BCM, and EPS systems.
FAQ
What is the maximum operating junction temperature for STM8AF52A8TDX?
The device is qualified to AEC-Q100 Grade 0, specifying continuous operation up to +150 °C junction temperature. Electrical characteristics in the datasheet (Section 10.3) are guaranteed across -40 °C to +150 °C ambient, with thermal derating applied above 125 °C ambient per Table 54's θJA value of 35 °C/W for LQFP64.
Does STM8AF52A8TDX 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 baud rate resynchronization. This eliminates external LIN transceivers for basic node functionality and enables single-wire communication with sensors and actuators in body electronics.
Can the 2 Kbyte data EEPROM be used for storing cryptographic keys?
No - the data EEPROM is not secured against read-out; it lacks hardware encryption or write-protection features required for key storage. It is intended for calibration data, fault logs, and configuration parameters. For secure key storage, external secure elements or STM32-based solutions with TrustZone are recommended.
Is SWIM debugging supported in production firmware without dedicated debug pins?
Yes - SWIM (Single-Wire Interface Module) uses only the NRST pin for in-circuit programming and debugging, requiring no additional pins. This enables full-speed halt, step, memory inspection, and register access during development and field diagnostics without compromising I/O count or board layout.
STM8AF52A8TDX 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 ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF52A8TDX FAQ
1.How can I place an order for STM8AF52A8TDX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF52A8TDX 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 STM8AF52A8TDX reliable?
The price and inventory of STM8AF52A8TDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF52A8TDX is usually 5 days.
3.What payment methods are accepted for STM8AF52A8TDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF52A8TDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF52A8TDX?
STM8AF52A8TDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF52A8TDX 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 STM8AF52A8TDX?
For technical support, including STM8AF52A8TDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF52A8TDX requirements.
6.How does Aetrix verify that STM8AF52A8TDX is sourced from the original manufacturer or authorized distributors?
All STM8AF52A8TDX 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 STM8AF52A8TDX meets industry standards.
7.What is the process for return or replacement of STM8AF52A8TDX?
All STM8AF52A8TDX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF52A8TDX, 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 STM8AF52A8TDX part is unused and in its original packaging.
Return procedure for STM8AF52A8TDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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