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STMicroelectronics STM8AF528ATCY
- Part No.:
- STM8AF528ATCY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 80-LQFP
- Datasheet:
-
STM8AF528ATCY.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,982
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Product details
Overview
STM8AF528ATCY 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 STM8AF528ATCY datasheet, STM8AF528ATCY pinout, STM8AF528ATCY application, or STM8AF528ATCY equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and power specifications, and confirmed drop-in alternatives for ECU and body control module design.
Technical Context
The STM8AF528ATCY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6 cycles/instruction average, achieving 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 failover detection.
Its peripheral set includes an advanced control timer (TIM1) with 4 CAPCOM channels, 3 complementary outputs, dead-time insertion, and synchronization logic; a 10-bit ADC with ±2 LSB total unadjusted error and up to 16 multiplexed inputs; and LINUART compliant with LIN 2.2 for master/slave auto-resynchronization.
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 at VDD = 3–5.5 V; supports real-time control loops with sub-42 ns instruction cycle time. |
| Flash Memory | 128 Kbyte on-chip Flash with 20-year data retention at 55 °C; supports field firmware updates without external memory. |
| Data EEPROM | 2 Kbyte true data EEPROM with 300 kcycle endurance; stores calibration parameters and fault logs across vehicle lifetime. |
| CAN Interface | High-speed CAN 2.0B compliant up to 1 Mbit/s; meets ISO 11898-1 for robust in-vehicle network communication. |
| ADC Resolution | 10-bit SAR ADC with ±2 LSB TUE and 1 LSB linearity; provides accurate analog sensor readings (e.g., throttle position, coolant temp). |
| Operating Temp | -40 °C to +150 °C ambient; qualified per AEC-Q100 Grade 0 for under-hood deployment without derating. |
| Supply Voltage | 3.0 V to 5.5 V; compatible with 5 V automotive battery systems and tolerant of load-dump transients. |
Pinout & Package
LQFP64 package: 64-pin, 10 × 10 mm, 0.5 mm pitch, exposed thermal pad (EP), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual VDD/VSS pairs ensure stable core and I/O domain operation under high-current switching noise. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7, PF0–PF7 | General-purpose I/O ports | 68 total user pins; 11 high-sink I/Os drive LEDs or relays directly; current injection immunity prevents latch-up in noisy environments. |
| NRST | Active-low reset input | Internal pull-up with Schmitt trigger; supports external reset supervision and brown-out detection. |
| OSC_IN / OSC_OUT | Crystal oscillator terminals | Supports 1–24 MHz external crystal; low-power resonator mode enables precise timing for CAN bit sampling. |
| CAN_RX / CAN_TX | CAN physical layer interface | Differential pair routed to external CAN transceiver; complies with ISO 11898-2 electrical requirements. |
| SWIM | Single-wire interface for programming/debug | Enables in-system programming and real-time debugging using one pin - no JTAG header required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for continuous operation at 150 °C ambient - suitable for engine bay ECUs without heatsinking. |
| Integrated CAN 2.0B controller | Hardware mailbox management, 16 message objects, automatic retransmission - reduces CPU overhead in multi-node networks. |
| True data EEPROM | Independent 2 Kbyte block with separate erase/write cycles; eliminates need for external serial EEPROM in cost-sensitive modules. |
| Advanced control timer (TIM1) | 3 complementary PWM outputs with programmable dead-time - enables direct driving of 3-phase motor gate drivers. |
| LIN 2.2-compliant LINUART | Automatic baud rate detection, sync field handling, and checksum generation - simplifies slave node implementation in body electronics. |
| Low-power modes (Wait/Halt/Active-halt) | Sub-1 µA halt current with RAM retention; wake-up via CAN, LIN, or external interrupt - extends battery life in always-on modules. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time acquisition of crankshaft position, oxygen sensor voltage, and throttle angle; closed-loop fuel injection timing control. IC Role / Device Role / Timing Role: Primary MCU executing control algorithms, managing CAN diagnostics, and synchronizing PWM outputs to injector drivers. Use Value: 24 MHz fCPU and deterministic interrupt latency enable 1° crankshaft resolution timing; CAN interface supports UDS diagnostic sessions over vehicle network. |
Use Scenario: Centralized management of door locks, window lifts, interior lighting, and mirror adjustment via LIN sub-nodes. IC Role / Device Role / Timing Role: Master node coordinating LIN slaves using hardware-assisted LINUART with auto-resync; handles CAN gateway functions to main bus. Use Value: Integrated LIN 2.2 compliance eliminates external protocol translator IC; 2 Kbyte EEPROM stores user preferences and fault history across ignition cycles. |
| Transmission Control Unit (TCU) | Heating/Ventilation Control |
Use Scenario: Monitoring transmission fluid temperature, turbine speed, and solenoid feedback; adaptive shift scheduling based on torque demand. IC Role / Device Role / Timing Role: Safety-relevant controller with watchdog supervision, ADC oversampling for thermal sensing, and CAN-based gear position reporting. Use Value: 10-bit ADC with ±2 LSB TUE ensures <±1.5 °C accuracy in fluid temp measurement; AEC-Q100 Grade 0 rating guarantees reliability at 150 °C under hood. |
Use Scenario: HVAC blower motor control, cabin temperature regulation, and air mix flap positioning using PWM and analog feedback. IC Role / Device Role / Timing Role: Dedicated motor controller interfacing with Hall-effect sensors and driving MOSFET half-bridges via TIM1 complementary outputs. Use Value: Advanced control timer with dead-time insertion prevents shoot-through in H-bridge drivers; 68 I/O pins support direct connection to multiple potentiometers and switches. |
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 |
|---|---|---|---|
| STM8AF5268TAY | 64 Kbyte Flash, same LQFP64 package, identical peripheral set except reduced Flash size and no CAN FD support. | Suitable for simpler ECUs with smaller firmware footprints; lacks margin for future OTA updates. | Select when cost optimization is critical and firmware size remains below 56 Kbyte with safety margins. |
| RL78/F13-64FB | Renesas RL78 core, 64 Kbyte Flash, CAN 2.0B, but only 10-bit ADC with ±3 LSB TUE and max 125 °C rating. | Requires external thermal derating for under-hood use above 125 °C; lower ADC accuracy impacts sensor calibration fidelity. | Choose only if existing Renesas toolchain integration outweighs STM8AF528ATCY's Grade 0 thermal advantage and higher ADC precision. |
Compared with STM8AF528ATCY, STM8AF5268TAY offers lower Flash capacity but identical CAN/LIN/ADC performance in the same footprint, while RL78/F13-64FB trades thermal robustness and ADC linearity for ecosystem compatibility - making STM8AF528ATCY optimal for new Grade 0 designs demanding long-term reliability and measurement fidelity.
Availability
STM8AF528ATCY is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and HVAC systems requiring stable component supply across extended automotive lifecycles.
Supply support for STM8AF528ATCY 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, safety-aware applications requiring AEC-Q100 qualification, extended temperature operation, and integrated communication peripherals - specifically engineered for ECU consolidation and modular vehicle architecture.
FAQ
What is the maximum operating junction temperature for STM8AF528ATCY?
The STM8AF528ATCY is rated for ambient temperatures from –40 °C to +150 °C and qualified per AEC-Q100 Grade 0. Its maximum junction temperature is 175 °C, verified under worst-case power dissipation and thermal resistance conditions (RθJA = 35 °C/W for LQFP64). This allows direct mounting on PCBs without heatsinks in under-hood locations.
Does STM8AF528ATCY support CAN FD?
No, STM8AF528ATCY implements only classical CAN 2.0B protocol with fixed 11-bit identifiers and up to 1 Mbit/s data rate. It does not support CAN FD features such as flexible data-rate switching, extended identifiers (29-bit), or payloads larger than 8 bytes. For CAN FD, ST recommends the SPC58x or STM32H7 series.
How many I/O pins support high-sink capability, and what is the rated current?
Eleven I/O pins (PA0–PA7, PB0–PB2, and PC0) are designated as high-sink I/Os, each capable of sinking up to 20 mA continuously at VDD = 5 V and TA = 25 °C. These pins meet automotive load-driving requirements for LEDs, relays, and small solenoids without external drivers.
Is SWIM debug supported in production firmware, and what security options exist?
Yes, SWIM (Single-Wire Interface Module) remains active in production firmware unless disabled via option byte configuration. Security features include read-out protection (ROP) levels 0–2, write protection (WP) for Flash and EEPROM sectors, and user boot code (UBC) lock - all configurable via dedicated option byte registers and enforced at power-on reset.
STM8AF528ATCY 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:
- 64KB (64K 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:
STM8AF528ATCY FAQ
1.How can I place an order for STM8AF528ATCY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF528ATCY 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 STM8AF528ATCY reliable?
The price and inventory of STM8AF528ATCY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF528ATCY is usually 5 days.
3.What payment methods are accepted for STM8AF528ATCY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF528ATCY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF528ATCY?
STM8AF528ATCY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF528ATCY 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 STM8AF528ATCY?
For technical support, including STM8AF528ATCY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF528ATCY requirements.
6.How does Aetrix verify that STM8AF528ATCY is sourced from the original manufacturer or authorized distributors?
All STM8AF528ATCY 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 STM8AF528ATCY meets industry standards.
7.What is the process for return or replacement of STM8AF528ATCY?
All STM8AF528ATCY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF528ATCY, 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 STM8AF528ATCY part is unused and in its original packaging.
Return procedure for STM8AF528ATCY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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