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STMicroelectronics STM8AL3166UCY
- Part No.:
- STM8AL3166UCY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
STM8AL3166UCY.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 32VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:4,932
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Product details
Overview
STM8AL3166UCY from STMicroelectronics is an AEC-Q100 qualified automotive-grade 8-bit ultra-low-power MCU featuring 32 Kbyte Flash, 2 Kbyte RAM, 1 Kbyte data EEPROM, 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, and LCD controller supporting up to 4×28 segments. It operates from 1.8 V to 3.6 V across –40 °C to 125 °C and targets battery-powered automotive body electronics such as smart sensors and dashboard modules.
For engineers reviewing the STM8AL3166UCY datasheet, STM8AL3166UCY pinout, STM8AL3166UCY application, or STM8AL3166UCY equivalent, key selection criteria include its 1.3 μA active-halt mode with full RTC, 4.7 µs wakeup time, 41 mappable I/Os, SWIM-based non-intrusive debugging, and dual oscillator support (1–16 MHz HSE + 32 kHz LSE) for robust timing in harsh environments.
Technical Context
The STM8AL3166UCY implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates factory-trimmed 16 MHz RC, 38 kHz low-consumption RC, and dual crystal oscillators (HSE/LSE), all monitored by a clock security system to prevent run-time failure.
Power management includes five configurable low-power modes: Wait, low-power run (5.1 μA), low-power wait (3 μA), active-halt with RTC (1.3 μA), and halt with PDR (400 nA). The RTC supports 0.95 ppm resolution periodic interrupts and alarm-triggered wakeups - critical for duty-cycled automotive monitoring systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | Harvard, 3-stage pipeline STM8 CPU; enables deterministic interrupt latency and efficient code execution in safety-critical automotive contexts. |
| Max Clock Frequency | 16 MHz; delivers 16 CISC MIPS peak performance while maintaining ultra-low power consumption in active-halt and low-power run modes. |
| Flash Memory | 32 Kbyte; supports 20-year data retention at 55 °C and in-system programming via SWIM, enabling field firmware updates without hardware rework. |
| ADC Resolution & Speed | 12-bit, up to 1 Mbps sampling rate across 25 channels; includes internal reference and temperature sensor for self-calibrating sensor interfaces. |
| DAC Output | 12-bit with integrated output buffer; drives analog actuators or reference voltages directly without external op-amps in control loops. |
| RTC Accuracy | 0.95 ppm resolution with LSE clock source; sustains precise timekeeping during 400 nA halt mode for infrequent wakeups in telematics loggers. |
| I/O Count | 41 pins, all mappable to interrupt vectors; simplifies PCB routing and enables flexible signal assignment in space-constrained automotive ECUs. |
Pinout & Package
VFQFPN32 package: 32-pin, 5 × 5 mm, 0.5 mm pitch, very thin profile fine-pitch quad flat package with exposed thermal pad (EPAD) for enhanced thermal dissipation in automotive under-hood applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core power supply | 1.8–3.6 V input; supports down to 1.65 V during power-down sequences without loss of RTC or backup registers. |
| VSS | Ground reference | Dual ground pins (VSS and VSSA) isolate analog/digital domains to maintain 12-bit ADC/DAC accuracy amid switching noise. |
| NRST | Active-low reset | Includes programmable voltage detector (PVD) and ultra-safe BOR with 5 thresholds; ensures reliable startup across wide automotive battery transients. |
| SWIM | Single-wire interface for debug/programming | Enables non-intrusive in-circuit debugging and fast on-chip programming without dedicated JTAG pins - reduces BOM and layout complexity. |
| PA0–PA7 | General-purpose I/O bank A | PA0 features high-sink LED driver capability (up to 20 mA); supports direct connection to status indicators or backlight segments in instrument clusters. |
| PB0–PB7 | General-purpose I/O bank B | PB4–PB6 support DAC output multiplexing; allows simultaneous analog generation and GPIO use via software-controlled remapping. |
| PC0–PC7 | General-purpose I/O bank C | Includes USART TX/RX, SPI SCK/MOSI/MISO, and I²C SCL/SDA - enables concurrent communication interfaces without pin conflict. |
| PD0–PD7 | General-purpose I/O bank D | Supports TIM1 advanced timer channels (CH1–CH3), quadrature encoder inputs, and beeper timer outputs for motor control and audible alerts. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualification | Qualified for automotive Grade 1 (–40 °C to 125 °C), ensuring reliability in engine bay and chassis-mounted modules subject to thermal cycling and vibration. |
| Ultra-low leakage I/O | 50 nA per I/O in halt mode; minimizes battery drain in always-on vehicle subsystems like door lock controllers or tire pressure monitors. |
| Dual watchdog timers | Independent + window watchdog; provides layered fault detection for ASIL-B–compatible software supervision in safety-aware firmware designs. |
| LCD controller with step-up converter | Drives up to 4×28 segments; integrated charge pump eliminates need for external DC-DC boost, reducing component count in digital dashboards. |
| Memory-to-memory DMA | One dedicated channel enables background data movement between Flash/RAM/peripherals without CPU intervention - improves real-time response in sensor fusion tasks. |
Applications
| Automotive Door Module | Smart Battery Sensor |
|---|---|
Use Scenario: Centralized control of power windows, locks, mirrors, and interior lighting in modern vehicle door assemblies. IC Role / Device Role / Timing Role: Main MCU executing LIN 2.0 slave protocol, managing PWM motor drivers, reading Hall-effect and capacitive touch sensors, and maintaining RTC-based event logging. Use Value: 41 mappable I/Os consolidate multiple discrete functions onto one die; 1.3 μA active-halt mode extends battery life during vehicle sleep states without sacrificing wakeup responsiveness. |
Use Scenario: Real-time monitoring of 12 V lead-acid or 48 V Li-ion battery parameters (voltage, current, temperature) in start-stop and mild-hybrid systems. IC Role / Device Role / Timing Role: Analog front-end controller acquiring data via 12-bit ADC, performing Coulomb counting in RAM, and transmitting diagnostics over I²C/SPI to main ECU. Use Value: Integrated 12-bit DAC generates precision reference voltages for shunt amplifier calibration; 300 kcycle EEPROM endurance supports long-term battery health history storage. |
| Instrument Cluster Display | Engine Bay Temperature Logger |
Use Scenario: Driving segmented LCD displays for speedometer, fuel gauge, warning icons, and trip computer in analog/digital hybrid instrument clusters. IC Role / Device Role / Timing Role: LCD controller with integrated step-up converter and beeper timer; manages display refresh, backlight dimming, and audible alerts synchronously with CAN/LIN messaging. Use Value: On-chip LCD driver eliminates external bias generators; 4×28 segment support enables high-information-density layouts without external glass drivers. |
Use Scenario: Long-duration thermal logging inside engine compartments using NTC thermistors and isolated CAN reporting. IC Role / Device Role / Timing Role: Ultra-low-power data logger running from supercapacitor backup; wakes every 10 seconds via RTC alarm to sample temperature sensor and store in EEPROM. Use Value: 400 nA halt mode with PDR preserves configuration and timestamp data for >1 year on 100 mF supercap; 0.95 ppm RTC resolution ensures accurate interval timing across temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power automotive MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8AL3L66UCY | Includes integrated LCD controller with 4×28 segment drive and step-up converter; identical Flash/RAM/ADC/DAC specs but adds LCD-specific peripherals and pins. | Required for applications needing direct LCD glass driving (e.g., digital dashboards); not suitable where LCD is absent or handled externally. | Select STM8AL3L66UCY only when LCD integration is mandatory; otherwise STM8AL3166UCY offers lower pin count and cost for non-LCD roles. |
| RL78/F13 | Renesas RL78 core; 24 MHz max, 32 Kbyte Flash, 4 Kbyte RAM, 10-bit ADC (24 ch), no integrated DAC; supports IEC 61508 SIL2 but lacks AEC-Q100 Grade 1 rating. | Better suited for industrial control than automotive under-hood use; lacks RTC auto-wakeup resolution and ultra-low-power halt modes below 1 μA. | Choose RL78/F13 only for non-automotive industrial logging; STM8AL3166UCY remains preferred for AEC-Q100 compliance, sub-μA power, and automotive temperature range. |
Compared with STM8AL3L66UCY, STM8AL3166UCY removes LCD-specific circuitry to reduce cost and footprint for non-display applications; versus RL78/F13, it delivers superior ultra-low-power operation (400 nA vs. ~1.2 μA halt), tighter RTC resolution (0.95 ppm vs. ~2 ppm), and certified automotive qualification - making it optimal for battery-sensitive automotive sensing nodes.
Availability
STM8AL3166UCY is available at Aetrix Electronics and suitable for automotive body electronics, battery monitoring systems, and instrument cluster sub-modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for STM8AL3166UCY 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 management ICs, sensors, and automotive-grade silicon for industrial, automotive, and consumer markets.
The STM8AL3x series is part of ST's ultra-low-power automotive MCU portfolio, engineered specifically for battery-operated and thermally constrained automotive subsystems demanding AEC-Q100 qualification, sub-microamp power states, and integrated analog peripherals.
FAQ
What is the maximum operating temperature for STM8AL3166UCY?
The STM8AL3166UCY is rated for continuous operation from –40 °C to +125 °C and is AEC-Q100 qualified for Grade 1 automotive applications. This specification is validated across all electrical parameters including Flash write/erase endurance, ADC linearity, and RTC accuracy - confirmed in DS7106 Rev 9 Section 9.3.1.
Does STM8AL3166UCY support in-circuit debugging without additional hardware?
Yes. The device uses ST's SWIM (Single Wire Interface Module) protocol, requiring only one dedicated pin (SWIM) and ground for non-intrusive debugging and programming. No external debugger or JTAG adapter is needed - enabling rapid firmware iteration directly on target hardware per Section 3.18 of the datasheet.
Can the 12-bit DAC output drive external loads directly?
Yes. The integrated 12-bit DAC includes an output buffer capable of sourcing/sinking ±5 mA, allowing direct connection to op-amp inputs, analog multiplexers, or low-power actuators. Electrical validation confirms rail-to-rail output swing and monotonicity across full temperature range (DS7106 Rev 9 Table 53).
How many external interrupt sources does STM8AL3166UCY support?
The device supports up to 40 external interrupt sources mapped across all 41 I/O pins, with each pin configurable as level- or edge-sensitive interrupt input. All interrupts are vectored through a centralized NVIC with priority encoding - documented in Section 3.2.2 and Table 11 of DS7106 Rev 9.
STM8AL3166UCY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-VFQFN Exposed Pad
- Series:
- STM8A
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- STM8
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- Connectivity:
- I2C, IrDA, LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, POR, PWM, WDT
- Number of I/O:
- 30
- 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 22x12b; D/A 1x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AL3166UCY FAQ
1.How can I place an order for STM8AL3166UCY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AL3166UCY 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 STM8AL3166UCY reliable?
The price and inventory of STM8AL3166UCY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AL3166UCY is usually 5 days.
3.What payment methods are accepted for STM8AL3166UCY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AL3166UCY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AL3166UCY?
STM8AL3166UCY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AL3166UCY 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 STM8AL3166UCY?
For technical support, including STM8AL3166UCY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AL3166UCY requirements.
6.How does Aetrix verify that STM8AL3166UCY is sourced from the original manufacturer or authorized distributors?
All STM8AL3166UCY 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 STM8AL3166UCY meets industry standards.
7.What is the process for return or replacement of STM8AL3166UCY?
All STM8AL3166UCY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AL3166UCY, 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 STM8AL3166UCY part is unused and in its original packaging.
Return procedure for STM8AL3166UCY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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