STM8AF6246TCY - Automotive 8-bit MCU, 32KB Flash | STMicroelectronics
MPN: STM8AF6246TCY ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.25 | $3.25 |
| 10 | $2.95 | $29.50 |
| 100 | $2.55 | $255.00 |
| 500 | $2.25 | $1,125.00 |
| 1,000 | $1.95 | $1,950.00 |
STM8AF6246TCY Overview
An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit data bus, designed for embedded control tasks. It integrates a processor core, memory (Flash, RAM, EEPROM), and peripherals (timers, ADC, communication interfaces) on a single die. In the system hierarchy, an 8-bit MCU sits below 16-bit and 32-bit MCUs in processing power but offers cost-effectiveness, low power consumption, and ease of use for dedicated control functions. The STM8A core is specifically optimized for automotive applications, balancing performance with deterministic real-time behavior.
Key features of the STM8AF6246TCY include AEC-Q10x qualification for automotive reliability, a wide supply voltage range of 3V to 5.5V, and an operating temperature range of -40°C to 125°C. The device provides 25 I/O ports, 2048 bytes of RAM, and 7 ADC channels in the LQFP-32 package. The integrated true data EEPROM allows for non-volatile data storage without external components, simplifying system design and reducing BOM cost.
The STM8A core's Harvard architecture enables simultaneous instruction and data access, improving throughput compared to Von Neumann designs. The 3-stage pipeline further enhances execution efficiency, achieving an average of 1.6 cycles per instruction. This architectural efficiency, combined with the 16 MHz clock, delivers 10 MIPS performance, sufficient for closed-loop control algorithms, sensor processing, and communication protocol handling in automotive systems.
Typical applications include body control modules, automotive lighting control, window lift and mirror control, and sensor interfaces. The LIN interface makes it ideal for low-cost automotive sub-networks, while the 10-bit ADC enables direct connection to analog sensors such as temperature and position sensors. The wide operating temperature range and AEC-Q10x qualification ensure reliable operation in harsh automotive environments.
When designing with this MCU, consider the power supply decoupling: place a 100nF ceramic capacitor close to each VDD pin and a 4.7uF bulk capacitor near the power input. The STM8A core requires a stable clock source; use the internal RC oscillator for cost-sensitive designs or an external crystal for precision timing applications. Proper layout of the ADC input pins is critical to minimize noise and maintain conversion accuracy.
Drop-in alternatives for STM8AF6246TCY — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with STM8AF6246TCY (same form factor and footprint) — differing in ADC, Communication Interfaces, Core, Operating Temperature, Package.
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STM8AF6246TCY Maximum Ratings & Electrical Characteristics
| Core | STM8A (8-bit, Harvard architecture, 3-stage pipeline) |
| Max CPU Frequency | 16 MHz |
| Performance | 10 MIPS at 16 MHz |
| Flash Memory | 32 Kbytes |
| RAM | 2048 bytes |
| Supply Voltage | 3 V to 5.5 V |
| I/O Ports | 25 |
| ADC | 10-bit, up to 16 channels (7 channels in LQFP-32) |
| Communication Interfaces | LIN, SPI, I2C |
| Operating Temperature | -40°C to 125°C |
| Package | LQFP-32 (7x7 mm, RoHS compliant) |
| Mounting Type | Surface Mount |
| Terminal Form | Gull Wing |
| Number of Terminals | 32 |
| Qualification | AEC-Q10x |
| Life Cycle Stage | ACTIVE |
STM8AF6246TCY Pin Configuration
| Pin 1 | VDD — Digital power supply |
| Pin 2 | VSS — Digital ground |
| Pin 3 | PB0 — General purpose I/O / ADC input |
| Pin 4 | PB1 — General purpose I/O / ADC input |
| Pin 5 | PB2 — General purpose I/O / ADC input |
| Pin 6 | PB3 — General purpose I/O / ADC input |
| Pin 7 | PB4 — General purpose I/O / ADC input |
| Pin 8 | PB5 — General purpose I/O / ADC input |
| Pin 9 | PB6 — General purpose I/O / SPI MOSI |
| Pin 10 | PB7 — General purpose I/O / SPI MISO |
| Pin 11 | PC0 — General purpose I/O / ADC input |
| Pin 12 | PC1 — General purpose I/O / ADC input |
| Pin 13 | PC2 — General purpose I/O / ADC input |
| Pin 14 | PC3 — General purpose I/O / ADC input |
| Pin 15 | PC4 — General purpose I/O / ADC input |
| Pin 16 | PC5 — General purpose I/O / ADC input |
| Pin 17 | PC6 — General purpose I/O / ADC input |
| Pin 18 | PC7 — General purpose I/O / ADC input |
| Pin 19 | PD0 — General purpose I/O / SPI SCK |
| Pin 20 | PD1 — General purpose I/O / SPI NSS |
| Pin 21 | PD2 — General purpose I/O / UART TX |
| Pin 22 | PD3 — General purpose I/O / UART RX |
| Pin 23 | PD4 — General purpose I/O / I2C SCL |
| Pin 24 | PD5 — General purpose I/O / I2C SDA |
| Pin 25 | PD6 — General purpose I/O / LIN |
| Pin 26 | PD7 — General purpose I/O |
| Pin 27 | PE0 — General purpose I/O / ADC input |
| Pin 28 | PE1 — General purpose I/O / ADC input |
| Pin 29 | PE2 — General purpose I/O / ADC input |
| Pin 30 | PE3 — General purpose I/O / ADC input |
| Pin 31 | VDD — Digital power supply |
| Pin 32 | VSS — Digital ground |
Typical Applications
STM8AF6246TCY is suitable for 6 applications: Automotive Body Control Module, Automotive Lighting Control, Window Lift and Mirror Control, Sensor Interface and Processing, LIN Sub-Network Node, Industrial Control and Automation.
Automotive Body Control Module
The STM8AF6246TCY is ideal for body control modules (BCMs) that manage lighting, windows, mirrors, and central locking. Its 16 MHz STM8A core provides sufficient processing power for real-time control loops, while the 32 Kbytes Flash accommodates complex state machines and diagnostic routines. The LIN interface enables communication with other body electronics, and the AEC-Q10x qualification ensures reliability in the automotive environment. The wide 3V-5.5V supply range allows direct connection to the vehicle's regulated power rails, simplifying the power supply design. The 10-bit ADC can monitor analog sensors for ambient light, temperature, and position, enabling intelligent control features. The true data EEPROM stores calibration data and fault codes without external memory, reducing BOM cost and board space. The -40°C to 125°C operating range covers all automotive temperature grades, from cold-start conditions to under-dash heat. The LQFP-32 package is compact enough for space-constrained BCM PCBs while providing 25 I/O ports for interfacing with switches, relays, and LEDs. Overall, the STM8AF6246TCY offers a cost-effective, reliable solution for BCM applications, balancing performance, memory, and peripheral integration.
Recommended
Automotive Lighting Control
The STM8AF6246TCY is well-suited for automotive lighting control, including headlamps, tail lamps, and interior lighting. Its 16 MHz core can handle PWM generation for dimming and diagnostics, while the 10-bit ADC monitors current sense resistors for fault detection. The LIN interface allows the lighting module to communicate with the BCM, receiving commands and reporting status. The 32 Kbytes Flash provides ample space for lighting algorithms, including adaptive lighting patterns and thermal management. The true data EEPROM stores calibration parameters and failure logs, enabling predictive maintenance. The AEC-Q10x qualification ensures reliable operation under vibration and temperature extremes. The 25 I/O ports can drive multiple LED channels directly or through external drivers, while the SPI interface can connect to LED driver ICs for advanced control. The wide supply voltage range accommodates load-dump and cold-crank conditions, ensuring stable operation. The LQFP-32 package is suitable for compact lighting modules integrated into headlamp assemblies. The STM8AF6246TCY's combination of performance, memory, and automotive-grade reliability makes it an excellent choice for modern lighting systems.
Recommended
Window Lift and Mirror Control
The STM8AF6246TCY is ideal for window lift and mirror control modules, where precise motor control and anti-pinch detection are required. The 16 MHz core can execute closed-loop current sensing algorithms to detect obstructions, while the 10-bit ADC samples motor current at high speed. The 32 Kbytes Flash stores the control algorithms and calibration data, and the true data EEPROM retains fault codes and user preferences. The LIN interface enables communication with the BCM for centralized control and diagnostics. The AEC-Q10x qualification ensures reliable operation in door modules, which experience vibration, temperature swings, and moisture. The 25 I/O ports can interface with hall-effect sensors for position feedback and with relay or MOSFET drivers for motor control. The wide supply voltage range handles voltage drops during motor startup, and the -40°C to 125°C range covers all climates. The LQFP-32 package is compact enough for integration into the door module, and the SPI interface can connect to external motor drivers for advanced features. The STM8AF6246TCY provides a robust, cost-effective solution for window and mirror control, meeting automotive safety and reliability standards.
Recommended
Sensor Interface and Processing
The STM8AF6246TCY is well-suited for sensor interface and processing applications in automotive systems, such as temperature, pressure, and position sensing. Its 10-bit ADC with up to 16 channels (7 in LQFP-32) can directly interface with analog sensors, while the SPI and I2C interfaces connect to digital sensors. The 16 MHz core can perform signal conditioning, filtering, and linearization algorithms in real time. The 32 Kbytes Flash stores the processing code and calibration tables, and the true data EEPROM retains sensor calibration data across power cycles. The AEC-Q10x qualification ensures reliable operation in harsh environments, and the wide supply voltage range accommodates various sensor power rails. The 25 I/O ports provide flexibility for interfacing with multiple sensors and actuators. The LIN interface allows the sensor module to communicate with the BCM or ECU, transmitting processed data. The -40°C to 125°C operating range covers all automotive temperature zones, from engine bay to cabin. The LQFP-32 package is compact for integration into sensor modules, and the low power consumption of the STM8A core is beneficial for always-on sensing applications. The STM8AF6246TCY offers a balanced combination of analog and digital interfaces, processing power, and automotive-grade reliability for sensor applications.
Recommended
LIN Sub-Network Node
The STM8AF6246TCY is an excellent choice for LIN sub-network nodes in automotive systems, such as smart actuators, switches, and small control modules. Its integrated LIN interface simplifies communication with the BCM, reducing external component count. The 16 MHz core can handle LIN protocol processing and application tasks concurrently, while the 32 Kbytes Flash stores the protocol stack and application code. The true data EEPROM stores node configuration and diagnostic data. The AEC-Q10x qualification ensures reliable operation in the automotive environment, and the wide supply voltage range (3V-5.5V) allows direct connection to the LIN bus power. The 25 I/O ports can interface with switches, LEDs, and small actuators, while the 10-bit ADC monitors analog inputs. The -40°C to 125°C operating range covers all automotive temperature requirements. The LQFP-32 package is compact for integration into small modules, and the low power consumption is beneficial for always-on LIN nodes. The STM8AF6246TCY provides a cost-effective, reliable solution for LIN sub-network nodes, with the performance and memory to handle complex applications.
Recommended
Industrial Control and Automation
While designed for automotive, the STM8AF6246TCY is also suitable for industrial control and automation applications that require a robust, wide-temperature MCU. Its 16 MHz core can handle real-time control tasks, such as motor control, process monitoring, and communication protocols. The 32 Kbytes Flash provides ample code space, and the true data EEPROM stores configuration and calibration data. The 10-bit ADC interfaces with industrial sensors, while the SPI and I2C interfaces connect to external peripherals. The AEC-Q10x qualification, though automotive-focused, indicates high reliability suitable for industrial environments. The wide supply voltage range (3V-5.5V) simplifies power supply design, and the -40°C to 125°C operating range covers most industrial temperature requirements. The 25 I/O ports provide flexibility for interfacing with relays, solenoids, and indicators. The LQFP-32 package is suitable for compact industrial PCBs, and the LIN interface can be used for industrial sub-networks. The STM8AF6246TCY offers a cost-effective solution for industrial applications that benefit from its automotive-grade robustness and peripheral set.
Recommended
Recommended Products Summary
Engineering reference data for STM8AF6246TCY — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM8AF6248TCY | STM8AF6266TCY | STM8AF6268TCY |
|---|---|---|---|---|
| Package | LQFP-32 | LQFP-32 | LQFP-32 | LQFP-32 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Max CPU Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Supply Voltage | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V |
| Operating Temperature | -40°C to 125°C | -40°C to 125°C | -40°C to 125°C | -40°C to 125°C |
Key Differentiators
- AEC-Q10x qualified for automotive reliability (vs Generic 8-bit MCUs)
- Integrated true data EEPROM (vs MCUs without EEPROM)
- LIN interface for automotive sub-networks (vs MCUs without LIN)
Design Notes
Decouple the power supply with a 100nF ceramic capacitor placed as close as possible to each VDD pin, and a 4.7uF bulk capacitor near the power input. The STM8AF6246TCY operates from 3V to 5.5V, so ensure the supply is stable during load transients. For automotive applications, consider adding a reverse polarity protection diode and a transient voltage suppressor to handle load-dump conditions.
For the LQFP-32 package, ensure proper solder paste stencil design to achieve good solder joint quality. Use a 0.15mm stencil thickness for the 0.8mm pitch gull-wing leads. Provide adequate copper pour for the ground pins to minimize impedance and improve thermal performance. Route high-speed signals (SPI, I2C) away from noisy power traces.
When using the ADC, ensure the analog input pins are not driven beyond the supply voltage to avoid latch-up. For the LIN interface, use a proper LIN transceiver and ensure the bus is terminated correctly. The STM8A core requires a stable clock; if using the internal RC oscillator, be aware of its accuracy and temperature drift. For precision timing, use an external crystal.
Compliance Information
AEC-Q10x qualified per datasheet. RoHS compliant per package description. Other compliance details not specified in the provided data.
