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STMicroelectronics STM8AL3L66TAY
- Part No.:
- STM8AL3L66TAY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM8AL3L66TAY.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,500
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Product details
Overview
STM8AL3L66TAY from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit ultra-low-power microcontroller featuring 32 Kbyte Flash, 2 Kbyte RAM, 1 Kbyte data EEPROM, integrated LCD controller (4×28 segments), 12-bit ADC (25 channels, up to 1 Mbps), 12-bit DAC with output buffer, two ultra-low-power comparators, RTC with BCD calendar and auto-wakeup (0.95 ppm resolution), and five low-power modes - including 400 nA Halt with PDR - for body control modules and dashboard instrumentation.
For engineers reviewing the STM8AL3L66TAY datasheet, STM8AL3L66TAY pinout, STM8AL3L66TAY application, or STM8AL3L66TAY equivalent, key selection criteria include AEC-Q100 qualification, sub-1 μA ultra-low-power operation, integrated LCD driver with step-up converter, dual comparator wakeup capability, and SWIM-based non-intrusive debugging support.
Technical Context
The STM8AL3L66TAY implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz max frequency and supporting up to 40 external interrupt sources. Its clock system integrates dual crystal oscillators (1–16 MHz HSE and 32 kHz LSE), factory-trimmed 16 MHz RC, and 38 kHz low-consumption RC with clock security system.
Power management includes five configurable low-power modes, programmable voltage detector (PVD), ultra-safe BOR with five thresholds, and ultra-low leakage I/Os (50 nA per pin). The RTC operates independently in active-halt mode (1.3 μA) and supports periodic wakeup with 0.95 ppm resolution when clocked by LSE.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | Harvard, 3-stage pipeline STM8 CPU; enables deterministic timing and efficient code execution in safety-critical automotive functions. |
| Max Clock Frequency | 16 MHz; delivers 16 CISC MIPS peak performance while maintaining ultra-low power consumption in run mode (195 μA/MHz + 440 μA). |
| Flash / EEPROM / RAM | 32 Kbyte Flash (20-year retention at 55 °C), 1 Kbyte true data EEPROM (300 kcycle endurance), 2 Kbyte RAM; supports robust firmware updates and parameter storage in harsh environments. |
| ADC / DAC | 12-bit ADC with 25 channels, 1 Mbps sampling; 12-bit DAC with output buffer on PB4–PB6; enables precise sensor signal conditioning and analog actuator control. |
| Low-Power Modes | Five modes: Wait, low-power run (5.1 μA), low-power wait (3 μA), active-halt with RTC (1.3 μA), halt with PDR (400 nA); allows dynamic power scaling for battery-backed automotive subsystems. |
| LCD Controller | Supports up to 4×28 segments with integrated step-up converter; eliminates external bias supply for automotive instrument cluster displays. |
| Operating Temp Range | −40 °C to 125 °C; certified for under-hood and cabin applications requiring extended thermal reliability. |
Pinout & Package
LQFP32 package (7 × 7 mm, 0.8 mm pitch), RoHS-compliant, ECOPACK®2 qualified. Pin count and function mapping align with STM8AL3Lx6T variant (with LCD support).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual VDD/VSS pairs ensure stable core and I/O domain operation across 1.65–3.6 V range; decoupling critical for EMC robustness in automotive wiring harnesses. |
| NRST | Active-low reset input | Accepts Schmitt-triggered input; supports external reset assertion and internal BOR/POR/PDR; enables fail-safe initialization in ECU power sequencing. |
| SWIM | Single-wire interface for debug/programming | Enables non-intrusive on-chip programming and real-time debugging without halting CPU; reduces test time during production programming. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7 | General-purpose I/Os (up to 41 total) | All mappable to interrupt vectors; 50 nA ultra-low leakage per I/O enables long-term battery monitoring in always-on modules. |
| LCDCOM1–LCDCOM4, LCDSEG1–LCDSEG28 | LCD segment and common outputs | Dedicated LCD driver pins with internal step-up converter; supports multiplexed glass display without external charge pump or bias IC. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40 °C to 125 °C operation and automotive stress testing; meets functional safety prerequisites for body electronics. |
| Ultra-low-power RTC with auto-wakeup | 1.3 μA active-halt current with 0.95 ppm resolution; enables precise timekeeping and scheduled wakeups for periodic CAN bus polling or sensor sampling. |
| Integrated LCD controller with step-up | Drives 4×28 segments directly; eliminates external DC-DC bias circuitry, reducing BOM cost and PCB area in instrument clusters. |
| Dual rail-to-rail comparators | One with fixed threshold, one with adjustable reference; both support wakeup-from-halt, enabling low-power window detection for battery voltage or temperature monitoring. |
| SWIM single-wire debug interface | Allows full flash programming, breakpoint setting, and register inspection without dedicated JTAG pins; simplifies PCB layout and reduces debug connector footprint. |
Applications
| Automotive Instrument Cluster | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Driving digital speedometer, fuel gauge, and warning indicators using segmented LCD glass. IC Role / Device Role / Timing Role: Primary MCU managing LCD refresh, CAN message parsing, and analog sensor acquisition (e.g., coolant temp, oil pressure). Use Value: Integrated LCD driver with step-up converter eliminates external bias IC; 125 °C rating ensures reliability behind dashboard glass. |
Use Scenario: Centralized control of door locks, interior lighting, mirror adjustment, and window lift motors. IC Role / Device Role / Timing Role: Low-power supervisor coordinating LIN communication, GPIO-driven relays, and wakeup via door handle sensor interrupts. Use Value: 400 nA Halt-with-PDR mode extends battery life during vehicle sleep; 41 mappable I/Os simplify integration of diverse actuators and sensors. |
| Smart Rearview Mirror | Tire Pressure Monitoring System (TPMS) ECU |
|
Use Scenario: Displaying blind-spot alerts and camera feeds on electrochromic or segmented LCD mirror surface. IC Role / Device Role / Timing Role: Secondary display controller synchronizing with main ADAS processor via SPI/I²C while managing local backlight and touch feedback. Use Value: Dual comparators detect ambient light changes for auto-dimming; RTC enables timestamped event logging without external time source. |
Use Scenario: Battery-powered TPMS node collecting pressure, temperature, and acceleration data for wireless transmission. IC Role / Device Role / Timing Role: Ultra-low-power sensor hub acquiring data via ADC, processing with internal temp sensor, and triggering RF transmit only on threshold breach. Use Value: 3 μA low-power wait mode and 4.7 µs fast wakeup minimize average current; 1 Kbyte EEPROM stores calibration offsets across 300k write cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive ultra-low-power MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8AL3L68TAY | Same die, higher Flash density (32 KB vs. 32 KB), identical peripherals and pinout; differs only in option byte configuration and factory programming. | No functional difference in hardware; used interchangeably where full Flash utilization is required. | Select STM8AL3L68TAY only if application requires full 32 KB Flash image with no reserved bootloader space. |
| RL78/F13-GB | Renesas RL78 core (16-bit), 24 MHz max, 128 KB Flash, 10 KB RAM; lacks integrated LCD driver but offers higher code density and LIN SAE J2602 compliance. | Better suited for complex LIN gateway functions; requires external LCD bias for equivalent display capability. | Choose RL78/F13-GB when migrating to 16-bit architecture with larger memory needs and LIN protocol stack certification. |
Compared with STM8AL3L68TAY, this part shares identical silicon and packaging but targets different Flash usage profiles; versus RL78/F13-GB, it trades raw performance and memory scale for lower system-level BOM cost and integrated LCD functionality in compact automotive displays.
Availability
STM8AL3L66TAY is available at Aetrix Electronics and suitable for automotive instrument clusters, body control modules, smart rearview mirrors, and tire pressure monitoring systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for STM8AL3L66TAY 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 STM8AL3Lxx series is part of ST's automotive ultra-low-power MCU portfolio, engineered specifically for battery-sensitive and thermally demanding body electronics applications requiring AEC-Q100 compliance and integrated human-machine interface peripherals.
FAQ
What is the maximum operating temperature for STM8AL3L66TAY?
The STM8AL3L66TAY is rated for continuous operation from −40 °C to +125 °C and is AEC-Q100 Grade 1 qualified. This specification is validated per JEDEC JESD22-A104 and JESD22-A108 standards, making it suitable for under-hood and cabin-mounted automotive ECUs where thermal derating must be minimized.
Does STM8AL3L66TAY support in-circuit programming after soldering?
Yes - the device supports single-wire interface for microcontroller (SWIM) programming and debugging directly on the PCB via the SWIM pin (Pin 10 in LQFP32). No external debugger hardware is needed beyond a SWIM-capable programmer; firmware updates can be performed without removing the MCU from the board.
Can the integrated LCD controller drive custom segment glass without external components?
Yes - the STM8AL3L66TAY's LCD controller includes an integrated step-up converter capable of generating up to 5.5 V from a 1.8–3.6 V supply, enabling direct drive of 4×28 segment LCD glass without external charge pumps or bias ICs. Segment and common outputs are dedicated and electrically isolated per LCDCOM/LCDSEG pin definitions.
How does the ultra-low-power comparator wakeup function work?
The device integrates two independent ultra-low-power comparators: COMP1 has a fixed internal threshold (VREFINT/4), while COMP2 supports rail-to-rail input and selectable reference. Both can generate interrupt requests and wake the MCU from Halt mode in under 4.7 µs, enabling battery voltage monitoring or thermal threshold detection with sub-microamp quiescent current.
STM8AL3L66TAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-LQFP
- Series:
- STM8A
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- STM8A
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- Connectivity:
- I2C, IrDA, LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, LCD, POR, PWM, WDT
- Number of I/O:
- 29
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 1K x 8
- RAM Size:
- 2K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.65V ~ 3.6V
- Data Converters:
- A/D 21x12b; D/A 1x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AL3L66TAY FAQ
1.How can I place an order for STM8AL3L66TAY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AL3L66TAY 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 STM8AL3L66TAY reliable?
The price and inventory of STM8AL3L66TAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AL3L66TAY is usually 5 days.
3.What payment methods are accepted for STM8AL3L66TAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AL3L66TAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AL3L66TAY?
STM8AL3L66TAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AL3L66TAY 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 STM8AL3L66TAY?
For technical support, including STM8AL3L66TAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AL3L66TAY requirements.
6.How does Aetrix verify that STM8AL3L66TAY is sourced from the original manufacturer or authorized distributors?
All STM8AL3L66TAY 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 STM8AL3L66TAY meets industry standards.
7.What is the process for return or replacement of STM8AL3L66TAY?
All STM8AL3L66TAY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AL3L66TAY, 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 STM8AL3L66TAY part is unused and in its original packaging.
Return procedure for STM8AL3L66TAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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