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STMicroelectronics STM8AF52A9TCY
- Part No.:
- STM8AF52A9TCY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM8AF52A9TCY.pdf
- Description:
- IC MCU 8BIT 128KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,440
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Product details
Overview
STM8AF52A9TCY from STMicroelectronics is an AEC-Q100 Grade 0 qualified automotive 8-bit microcontroller featuring a 24 MHz STM8A core, 128 Kbyte Flash program memory, 2 Kbyte true data EEPROM, 10-bit ADC with 16-channel multiplexing, and integrated CAN 2.0B (1 Mbit/s), LIN, USART, SPI, and I²C interfaces. It operates from 3 to 5.5 V across –40 °C to 150 °C ambient, targeting engine control units and body electronics requiring high-temperature reliability.
For engineers reviewing the STM8AF52A9TCY datasheet, STM8AF52A9TCY pinout, STM8AF52A9TCY application, or STM8AF52A9TCY equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade operating parameters, and real-world use cases in powertrain and chassis systems.
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. Its clock system includes trimmable 16 MHz HSI and 128 kHz LSI oscillators plus external crystal support up to 24 MHz, all monitored by a dedicated clock security system (CSS).
Interrupt handling uses a nested controller with 32 vectors and supports up to 37 external interrupts across 5 vectors. The advanced control timer provides 4 CAPCOM channels, 3 complementary outputs, dead-time insertion, and synchronization - essential for motor control and power conversion timing precision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard CPU with 3-stage pipeline; enables deterministic real-time response in safety-critical automotive firmware. |
| Max fCPU | 24 MHz; supports time-critical control loops at ≤41.7 ns instruction cycle time under full voltage/temperature range. |
| Flash Memory | 128 Kbyte with 20-year data retention at 55 °C; sufficient for complex engine management firmware with field-upgrade capability. |
| Data EEPROM | 2 Kbyte true EEPROM with 300 kcycle endurance; stores calibration data, odometer values, and fault logs without external NV memory. |
| CAN Interface | High-speed CAN 2.0B compliant at 1 Mbit/s; meets ISO 11898-2 physical layer requirements for powertrain networking. |
| ADC Resolution | 10-bit with ±2 LSB total unadjusted error (TUE); provides sufficient dynamic range for sensor signal acquisition (e.g., throttle position, coolant temp). |
| Operating Temp | –40 °C to +150 °C ambient; qualified per AEC-Q100 Grade 0, enabling placement near engines or under-hood ECUs. |
| Supply Voltage | 3.0 V to 5.5 V; compatible with automotive battery transients and direct connection to 5 V regulated rails. |
Pinout & Package
LQFP64 package (10 × 10 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 3–5.5 V supply rail; requires local 100 nF ceramic decoupling per VDD pin. |
| VSS | Ground reference | Digital ground return; must be connected to low-impedance PCB plane for noise immunity. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts 1.2 V logic threshold for compatibility with 3.3 V or 5 V systems. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with high-sink capability (20 mA); configurable as analog inputs, timers, or communication signals. |
| PB0–PB7 | General-purpose I/O port B | 8-bit port supporting alternate functions including CAN_TX, CAN_RX, LIN, and SPI clock/data lines. |
| PC0–PC7 | General-purpose I/O port C | Includes ADC channel inputs (PC0–PC7), USART TX/RX, and TIM1/2/3/4 capture/compare pins. |
| PD0–PD7 | General-purpose I/O port D | Supports I²C SCL/SDA, SPI NSS, and advanced timer complementary outputs with dead-time control. |
| PE0–PE7 | General-purpose I/O port E | Provides additional ADC channels, UART clock output, and SWIM debug interface (PE1/PE2). |
| PF0–PF7 | General-purpose I/O port F | Includes oscillator inputs (PF0/PF1), HSE bypass mode, and high-voltage tolerant pins for LIN bus interface. |
| VCAP | Internal regulator capacitor node | Requires 2.2 µF X7R ceramic capacitor to stabilize on-chip 1.8 V core regulator; critical for EMC robustness. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for operation up to +150 °C ambient, enabling under-hood deployment without derating. |
| Integrated CAN 2.0B controller | Hardware-based message filtering, FIFO buffering, and automatic retransmission reduce CPU load in multi-node networks. |
| True data EEPROM | 2 Kbyte nonvolatile memory with guaranteed 300 kwrite cycles; eliminates need for 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 for 3-phase motor gate drive. |
| Single-wire interface module (SWIM) | On-chip debug interface using only PE1 pin; enables full flash programming and real-time debugging without JTAG header footprint. |
| Low-power modes with clock gating | Wait, auto-wakeup, and Halt modes with per-peripheral clock enable/disable; reduces active current to <100 µA in Halt with RTC running. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time monitoring of crankshaft position, camshaft timing, and oxygen sensor feedback to compute fuel injection timing and spark advance. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop combustion control algorithms with sub-millisecond interrupt latency. Use Value: 24 MHz CPU speed and deterministic 1.6-cycle/instruction execution ensure consistent loop timing across temperature extremes. | Use Scenario: Centralized management of door locks, window lifts, lighting sequences, and HVAC fan speed via LIN and CAN buses. IC Role / Device Role / Timing Role: System coordinator interfacing with multiple LIN slave nodes and gatewaying to main CAN backbone. Use Value: Integrated LINUART with automatic resynchronization tolerates bus jitter from low-cost transceivers while maintaining protocol compliance. |
| Transmission Control Unit (TCU) | Electric Power Steering (EPS) |
Use Scenario: Gear selection logic, solenoid driver timing, and torque converter clutch control based on vehicle speed and throttle position. IC Role / Device Role / Timing Role: Safety-relevant controller managing high-current actuators with hardware watchdog supervision. Use Value: Independent and window watchdog timers with early-warning interrupt prevent runaway code during transient faults. | Use Scenario: Torque assist calculation and three-phase BLDC motor commutation using Hall sensor inputs and PWM outputs. IC Role / Device Role / Timing Role: Motor control MCU generating synchronized PWM with dead-time protection on complementary outputs. Use Value: Advanced control timer (TIM1) provides hardware-level dead-time insertion and flexible synchronization to avoid shoot-through in inverter stages. |
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 |
|---|---|---|---|
| STM8AF52A6TCY | Same package and pinout; 64 Kbyte Flash, 1 Kbyte EEPROM, no CAN interface. | Suitable for LIN-only or SPI/I²C-based body electronics where CAN is unnecessary. | Select when CAN is not required and firmware size is ≤64 KB; lower cost and reduced feature set. |
| STM32F042F6P6 | 32-bit ARM Cortex-M0 core, 32 Kbyte Flash, no built-in CAN PHY; requires external transceiver. | Higher performance for algorithm-intensive tasks but lacks native CAN controller and AEC-Q100 Grade 0 rating. | Choose for applications needing >10 MIPS or USB connectivity, accepting added BOM cost and qualification effort. |
Compared with STM8AF52A6TCY, the STM8AF52A9TCY adds CAN, doubles Flash and EEPROM, and extends temperature range - making it optimal for powertrain. Versus STM32F042F6P6, it offers native CAN, higher temperature grade, and lower interrupt latency at the expense of 32-bit ecosystem advantages.
Availability
STM8AF52A9TCY 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 STM8AF52A9TCY 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 components since 1987.
The STM8A automotive MCU 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.
FAQ
What is the maximum operating frequency and corresponding voltage range for STM8AF52A9TCY?
The STM8AF52A9TCY achieves a maximum CPU frequency of 24 MHz across its full supply range of 3.0 V to 5.5 V, with guaranteed operation at –40 °C to +150 °C ambient. Electrical characteristics tables confirm fCPUmax remains stable at 24 MHz even at VDD = 3.0 V and TA = 150 °C, per Figure 11 in the datasheet.
Does STM8AF52A9TCY 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 resynchronization. This allows direct connection to standard LIN transceivers without software bit-banging, reducing CPU overhead and improving protocol timing accuracy.
How is the internal 16 MHz RC oscillator calibrated for production accuracy?
The 16 MHz high-speed internal RC oscillator (HSI) is factory-trimmed to ±1% accuracy at 25 °C and maintains ±2% over –40 °C to +125 °C. Users can further adjust trimming via the CLK_HSITRIMR register, enabling system-level calibration against an external reference clock if needed.
What debug interface does STM8AF52A9TCY support, and what pins are required?
It supports the Single-Wire Interface Module (SWIM) debug interface using only PE1 (SWIM) and VDD/VSS. No dedicated debug header is needed - programming and real-time debugging occur over a single wire, minimizing PCB footprint and connector cost while retaining full flash read/write/erase and breakpoint capability.
STM8AF52A9TCY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-LQFP
- Series:
- STM8A
- Packaging:
- Tray
- 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:
STM8AF52A9TCY FAQ
1.How can I place an order for STM8AF52A9TCY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF52A9TCY 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 STM8AF52A9TCY reliable?
The price and inventory of STM8AF52A9TCY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF52A9TCY is usually 5 days.
3.What payment methods are accepted for STM8AF52A9TCY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF52A9TCY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF52A9TCY?
STM8AF52A9TCY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF52A9TCY 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 STM8AF52A9TCY?
For technical support, including STM8AF52A9TCY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF52A9TCY requirements.
6.How does Aetrix verify that STM8AF52A9TCY is sourced from the original manufacturer or authorized distributors?
All STM8AF52A9TCY 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 STM8AF52A9TCY meets industry standards.
7.What is the process for return or replacement of STM8AF52A9TCY?
All STM8AF52A9TCY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF52A9TCY, 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 STM8AF52A9TCY part is unused and in its original packaging.
Return procedure for STM8AF52A9TCY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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