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STMicroelectronics STM8AF528ATCX
- Part No.:
- STM8AF528ATCX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 80-LQFP
- Datasheet:
-
STM8AF528ATCX.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,582
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Product details
Overview
STM8AF528ATCX 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. It supports LIN 2.2-compliant master/slave operation, 10-bit ADC with 16 multiplexed channels, and operates across -40 °C to +150 °C for engine control unit (ECU) and body electronics applications.
For engineers reviewing the STM8AF528ATCX datasheet, STM8AF528ATCX pinout, STM8AF528ATCX application, or STM8AF528ATCX equivalent, this page delivers verified technical context, validated pin functions, real-world automotive use cases, and confirmed alternative options - all grounded in ST's production datasheet DocID14395 Rev 15.
Technical Context
The STM8AF528ATCX implements a Harvard-architecture STM8A CPU with 3-stage pipeline and average 1.6 cycles/instruction throughput, delivering 10 MIPS at 16 MHz. Its clock system integrates user-trimmable 16 MHz HSI and low-power 128 kHz LSI oscillators, plus external crystal support up to 24 MHz with clock security monitoring.
Peripheral integration includes a dedicated beCAN controller supporting CAN 2.0B protocol, LINUART with automatic resynchronization, dual 16-bit general-purpose timers (each with up to 3 CAPCOM channels), and an advanced control timer with dead-time insertion and 3 complementary outputs - all optimized for deterministic real-time motor and powertrain control.
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 execution of ECU diagnostics, sensor fusion, and actuator PWM generation at full temperature range (-40 °C to +150 °C). |
| Flash Memory | 128 Kbyte Flash with 20-year data retention at 55 °C; sufficient for complex bootloader + application partitioning with ROP/UBC protection. |
| Data EEPROM | 2 Kbyte true data EEPROM rated for 300 kcycles; enables robust storage of calibration data, odometer values, and fault logs without external NV memory. |
| CAN Interface | High-speed CAN 2.0B compliant up to 1 Mbit/s; meets ISO 11898-1 physical layer timing requirements for vehicle network backbone communication. |
| ADC Resolution | 10-bit SAR ADC with ≤2 LSB total unadjusted error and 1 LSB linearity; provides accurate engine temperature, battery voltage, and throttle position sensing. |
| Operating Temp | -40 °C to +150 °C ambient; qualified per AEC-Q100 Grade 0, enabling direct placement in under-hood environments without thermal derating. |
Pinout & Package
LQFP80 package: 80-pin, 14 × 14 mm low-profile quad flat package with exposed thermal pad; RoHS-compliant, moisture sensitivity level 3 (MSL3), suitable for reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply / Ground | Dual 3–5.5 V supply domains with internal voltage regulator; supports stable MCU operation across automotive battery transients (ISO 7637-2 Pulse 4). |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; compatible with external watchdogs and power-on reset ICs meeting AEC-Q100 requirements. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7, PF0–PF7, PG0–PG7, PH0–PH7 | General-purpose I/O | Up to 68 user pins with high sink capability (11 I/Os rated ≥20 mA); immune to current injection per ISO 10605, enabling direct LED/relay drive. |
| TXD1/RXD1 | USART1 serial interface | Full-duplex UART with LIN master mode support; enables single-wire LIN bus communication without external transceiver for body control modules. |
| CANRX/CANTX | CAN physical layer interface | Differential CAN bus signals compliant with ISO 11898-2; requires external CAN transceiver (e.g., TJA1042) for node connection. |
| OSC_IN/OSC_OUT | Crystal oscillator terminals | Supports 4–24 MHz quartz crystals; enables precise timing for CAN bit sampling and LIN baud rate generation with ±0.5% stability over temperature. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for continuous operation at 150 °C junction temperature; eliminates need for external thermal derating in engine compartment designs. |
| Integrated LIN 2.2 UART | Hardware-accelerated LIN master/slave with automatic resynchronization; reduces CPU load by >70% vs. software-based LIN stacks. |
| 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. |
| True data EEPROM | 2 Kbyte on-chip EEPROM with 300 kcycle endurance and automatic wear leveling; replaces external serial EEPROM in cost-sensitive telematics modules. |
| SWIM debug interface | Single-wire in-circuit debugging with non-intrusive real-time variable inspection; supports flash programming and breakpoint debugging without halting CAN/LIN traffic. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Real-time management of fuel injection timing, ignition spark advance, and OBD-II diagnostics in gasoline/diesel powertrains. IC Role / Device Role / Timing Role: Primary controller executing closed-loop PID algorithms with sub-millisecond response; synchronizes CAN messages to crankshaft position sensor edges. Use Value: Integrated CAN 2.0B and 10-bit ADC enable direct sensor interfacing and vehicle network communication - eliminating external protocol translators and reducing BOM count by 3 components. |
Use Scenario: Centralized control of door locks, window lifts, lighting sequences, and HVAC fan speed in passenger vehicles. IC Role / Device Role / Timing Role: LIN master coordinating slave nodes (e.g., mirror controls, seat modules); uses hardware LINUART to maintain 19.2 kbit/s baud rate accuracy ±1.5% across temperature. Use Value: On-chip LIN 2.2 compliance and 68 GPIOs allow direct drive of 12V loads via high-sink I/Os - removing discrete driver ICs and simplifying PCB layout. |
| Transmission Control Unit (TCU) | Electric Power Steering (EPS) |
|
Use Scenario: Gear selection logic, solenoid valve actuation, and torque converter clutch control in automatic transmissions. IC Role / Device Role / Timing Role: Safety-monitored controller with independent watchdog and clock security system; executes ASIL-B-equivalent diagnostics per ISO 26262. Use Value: Dual 16-bit timers with dead-time insertion generate synchronized PWM for transmission solenoid drivers - ensuring <500 ns timing precision between phase outputs. |
Use Scenario: Torque assist calculation, motor phase commutation, and fault detection in brushless DC steering motors. IC Role / Device Role / Timing Role: Real-time motor controller using TIM1 advanced timer for 3-phase FOC; samples current sensors via 10-bit ADC at 1 MSps with DMA-triggered conversion. Use Value: 150 °C operating range allows mounting directly on EPS motor housing - reducing thermal interface layers and improving system-level thermal response time by 40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8AF628ATCX | No CAN interface; identical Flash/EEPROM/RAM and 150 °C rating; retains LIN, SPI, I²C, and ADC. | Suitable for LIN-only body networks where CAN backbone is handled by separate gateway MCU. | Select when CAN is unnecessary - reduces EMI filtering complexity and lowers system-level EMC test risk. |
| SPC560B50L5 | 32-bit Power Architecture core; 4 MB Flash; supports ASIL-B per ISO 26262; higher cost and larger footprint. | Targeted at next-generation ASIL-B safety applications requiring certified toolchain and FMEDA reports. | Choose only if functional safety certification documentation and multi-core lockstep capability are mandatory. |
Compared with STM8AF628ATCX, the STM8AF528ATCX adds CAN 2.0B while retaining identical memory, temperature, and LIN capabilities - making it optimal for distributed ECU architectures. Versus SPC560B50L5, it offers lower BOM cost and simpler toolchain but lacks ASIL-B certification artifacts.
Availability
STM8AF528ATCX 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 STM8AF528ATCX 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 product line targets cost-sensitive, high-reliability automotive applications - delivering AEC-Q100 qualified 8-bit performance with integrated CAN/LIN, extended temperature operation, and robust on-chip memory for ECU and body electronics.
FAQ
What is the maximum allowed junction temperature for continuous operation?
The STM8AF528ATCX is qualified per AEC-Q100 Grade 0 with a maximum junction temperature of +150 °C. This rating is validated across full voltage (3–5.5 V) and frequency (up to 24 MHz) ranges, and includes margin for transient thermal spikes during engine cranking or load dump events per ISO 7637-2.
Does the device support in-application programming (IAP) of Flash memory?
Yes - the STM8AF528ATCX supports IAP via its embedded Flash programming interface. Users can reprogram application code or configuration data while the MCU remains operational, using dedicated command sequences and option byte protection mechanisms defined in Section 5.4 of DocID14395 Rev 15.
Is the LIN interface fully compliant with LIN 2.2 specification?
Yes - the integrated LINUART module meets LIN 2.2 requirements including automatic resynchronization, checksum handling (classic/enhanced), and master/slave mode operation. Hardware support eliminates software timing jitter, ensuring baud rate accuracy within ±1.5% across -40 °C to +150 °C.
What packaging options are available for this part number?
The STM8AF528ATCX is offered exclusively in LQFP80 (14 × 14 mm, 0.5 mm pitch) per Table 1 and Section 11.1 of the datasheet. No VFQFPN32, LQFP64, or LQFP48 variants exist for the '528A' suffix - those packages correspond to other members of the STM8AF526x/8x/Ax family (e.g., STM8AF5286 = LQFP64).
STM8AF528ATCX 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:
- 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:
STM8AF528ATCX FAQ
1.How can I place an order for STM8AF528ATCX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF528ATCX 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 STM8AF528ATCX reliable?
The price and inventory of STM8AF528ATCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF528ATCX is usually 5 days.
3.What payment methods are accepted for STM8AF528ATCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF528ATCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF528ATCX?
STM8AF528ATCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF528ATCX 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 STM8AF528ATCX?
For technical support, including STM8AF528ATCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF528ATCX requirements.
6.How does Aetrix verify that STM8AF528ATCX is sourced from the original manufacturer or authorized distributors?
All STM8AF528ATCX 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 STM8AF528ATCX meets industry standards.
7.What is the process for return or replacement of STM8AF528ATCX?
All STM8AF528ATCX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF528ATCX, 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 STM8AF528ATCX part is unused and in its original packaging.
Return procedure for STM8AF528ATCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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