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STMicroelectronics STM8AF52AATCY
- Part No.:
- STM8AF52AATCY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 80-LQFP
- Datasheet:
-
STM8AF52AATCY.pdf
- Description:
- IC MCU 8BIT 128KB FLASH 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:372
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Product details
Overview
STM8AF52AATCY 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 STM8AF52AATCY datasheet, STM8AF52AATCY pinout, STM8AF52AATCY application, or STM8AF52AATCY equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and power specifications, and confirmed alternative options for ECU and body control module 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; clock management includes trimmable 16 MHz HSI, 128 kHz LSI, and external crystal oscillator with clock security system (CSS) monitoring.
Analog and communication subsystems include a 10-bit ADC (2 LSB TUE, 16-channel multiplexing), dual USARTs (one LIN 2.2-compliant with auto-resynchronization), SPI (up to 10 Mbit/s), I²C (400 Kbit/s), and a dedicated beCAN controller supporting full CAN 2.0B protocol with message filtering and FIFO buffering.
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 - supports real-time control loops with sub-100 ns instruction timing at full voltage range (3–5.5 V). |
| Flash Memory | 128 Kbyte Flash with 20-year data retention at 55 °C - suitable for field-updatable ECU firmware requiring long-term reliability. |
| Data EEPROM | 2 Kbyte true data EEPROM, 300 kcycle endurance - stores calibration parameters, odometer values, and fault logs without external NV memory. |
| CAN Interface | High-speed CAN 2.0B compliant, 1 Mbit/s operation - meets ISO 11898-2 physical layer requirements for powertrain and chassis networks. |
| ADC Resolution | 10-bit SAR ADC with 2 LSB total unadjusted error (TUE) and 1 LSB integral nonlinearity - provides sufficient accuracy for throttle position and temperature sensing. |
| Operating Temp | −40 °C to +150 °C ambient - qualified per AEC-Q100 Grade 0 for under-hood deployment in engine control modules. |
Pinout & Package
LQFP64 package (7 mm × 7 mm, 0.5 mm pitch), thermally enhanced for automotive under-hood environments; 64-pin layout supports full peripheral routing including dual CAN/USART, 16-channel ADC inputs, and high-sink I/Os (11 pins rated ≥20 mA sink).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual VDD/VSS pairs ensure low-noise analog/digital domain separation; VCAP capacitor required for internal regulator stability. |
| PX0–PX7 (X=A–E) | General-purpose I/O | Up to 68 user pins; 11 high-sink I/Os support direct LED/relay driving; all pins immune to current injection per AEC-Q100. |
| PD0/PD1 | CAN_H/CAN_L | Dedicated differential transceiver pins compliant with ISO 11898-2; integrated bus fault protection and slew-rate control. |
| PA0–PA3 | ADC_IN0–ADC_IN3 | Analog input channels with programmable sampling time; share pins with GPIO and timers for flexible signal routing. |
| PC3/PC4 | USART1_TX/USART1_RX | Full-duplex UART with LIN master capability; supports synchronous clock output for daisy-chain sensor interfaces. |
| PE0/PE1 | SPI1_NSS/SPI1_SCK | Master/slave SPI interface with hardware NSS control; supports up to 10 Mbit/s for fast flash programming or sensor streaming. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for −40 °C to +150 °C operation with extended life testing - eliminates need for additional thermal derating in engine bay designs. |
| 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 without external logic. |
| Single-wire interface module (SWIM) | On-chip debug interface using single pin (SWIM) - allows full in-circuit programming and real-time variable inspection without JTAG overhead. |
| Low-power modes (Wait/Halt) | User-definable clock gating across peripherals; <1 μA halt current with RTC active - extends battery life in always-on vehicle modules. |
| LINUART peripheral | Hardware LIN 2.2 compliance with automatic resynchronization and master/slave mode - reduces CPU load for body electronics communication (e.g., door modules, seat controls). |
Applications
| Engine Control Unit (ECU) | Transmission Control Module (TCM) |
|---|---|
Use Scenario: Real-time acquisition of crankshaft position, throttle angle, and coolant temperature; 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 and synchronized PWM output for injector drivers. Use Value: Integrated CAN and LIN reduce external transceiver count; 150 °C rating enables placement near engine block without heatsink. | Use Scenario: Monitoring gear selector position, turbine speed, and hydraulic pressure; managing solenoid valve sequencing and clutch engagement timing. IC Role / Device Role / Timing Role: Safety-critical controller with watchdog supervision and memory ECC; executes transmission shift logic with <50 μs jitter tolerance. Use Value: 2 Kbyte EEPROM stores adaptive learning parameters (e.g., clutch wear compensation); CAN interface enables seamless integration into vehicle CAN backbone. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
Use Scenario: Centralized management of lighting, window lift, mirror adjustment, and door lock actuators via LIN subnetworks. IC Role / Device Role / Timing Role: LIN master coordinating up to 16 slave nodes; handles wake-up events from key fob RF receiver and manages sleep/wake transitions. Use Value: Hardware LINUART eliminates software bit-banging; low-power Halt mode draws <1 μA during vehicle sleep state. | Use Scenario: Torque assist calculation based on steering torque sensor, vehicle speed, and motor position feedback; generation of three-phase PWM for brushless assist motor. IC Role / Device Role / Timing Role: Real-time motor controller with advanced TIM1 timer generating synchronized 3-phase PWM with dead-time control and fault shutdown. Use Value: 16-bit advanced timer with complementary outputs replaces external gate driver IC; CAN interface reports EPS status to ADAS domain controller. |
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 |
|---|---|---|---|
| STM8AF62AATCY | No CAN interface; retains LIN, SPI, I²C, 10-bit ADC, and same Flash/EEPROM/RAM resources. | Suitable for LIN-only body electronics (e.g., HVAC, lighting) where CAN connectivity is unnecessary. | Select when CAN is not required and cost optimization is prioritized without sacrificing memory or analog capability. |
| RL78/F13-BCF | Renesas RL78 core (16-bit), 32 MHz max, 128 KB Flash, 10-bit ADC, CAN 2.0B, but no LIN hardware peripheral. | Requires software LIN stack; higher code efficiency but larger footprint and different toolchain dependencies. | Choose for migration paths requiring 16-bit performance headroom or existing Renesas ecosystem alignment. |
Compared with STM8AF62AATCY, this part adds essential CAN capability for powertrain networks; versus RL78/F13-BCF, it offers native LIN support and lower interrupt latency for time-critical automotive tasks, though with 8-bit instruction set constraints.
Availability
STM8AF52AATCY is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and electric power steering systems requiring stable component supply across extended automotive lifecycles.
Supply support for STM8AF52AATCY 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 microcontroller product line targets cost-sensitive, high-reliability applications in powertrain, chassis, and body electronics - emphasizing AEC-Q100 qualification, extended temperature operation, and integrated communication peripherals to reduce system BOM count.
FAQ
What is the maximum operating junction temperature for STM8AF52AATCY?
The device is qualified for ambient temperatures from −40 °C to +150 °C per AEC-Q100 Grade 0. Its maximum junction temperature is 175 °C, validated through thermal cycling and HTOL testing. Thermal resistance θJA is 35 °C/W for LQFP64 package, requiring appropriate PCB copper area for sustained 150 °C ambient operation.
Does STM8AF52AATCY support in-application programming (IAP) of Flash memory?
Yes, the device supports full in-application programming via its embedded Flash loader. Firmware can reprogram user Flash sectors while executing from other sectors, enabling secure over-the-air updates. The Flash memory includes write protection (WP), read-out protection (ROP), and user boot code (UBC) locking features to prevent unauthorized access.
How many CAN message objects does the beCAN peripheral support?
The beCAN controller supports 16 message objects in dedicated RAM, configurable as transmit or receive buffers with individual acceptance masks and filters. It implements full CAN 2.0B protocol handling including identifier arbitration, error frame generation, and automatic retransmission - eliminating need for external CAN protocol offload.
Is the 128 kHz LSI oscillator calibrated at production?
No, the 128 kHz low-speed internal RC oscillator is not factory-calibrated; its typical accuracy is ±30% over temperature and voltage. For timekeeping applications requiring tighter tolerance, designers must use the external 32.768 kHz crystal option with RTC or perform one-time software calibration using the HSE or HSI as reference during production test.
STM8AF52AATCY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 80-LQFP
- Series:
- STM8A
- Packaging:
- Tray
- 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:
STM8AF52AATCY FAQ
1.How can I place an order for STM8AF52AATCY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF52AATCY 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 STM8AF52AATCY reliable?
The price and inventory of STM8AF52AATCY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF52AATCY is usually 5 days.
3.What payment methods are accepted for STM8AF52AATCY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF52AATCY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF52AATCY?
STM8AF52AATCY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF52AATCY 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 STM8AF52AATCY?
For technical support, including STM8AF52AATCY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF52AATCY requirements.
6.How does Aetrix verify that STM8AF52AATCY is sourced from the original manufacturer or authorized distributors?
All STM8AF52AATCY 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 STM8AF52AATCY meets industry standards.
7.What is the process for return or replacement of STM8AF52AATCY?
All STM8AF52AATCY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF52AATCY, 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 STM8AF52AATCY part is unused and in its original packaging.
Return procedure for STM8AF52AATCY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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