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STMicroelectronics STM8AL3166UAY
- Part No.:
- STM8AL3166UAY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
STM8AL3166UAY.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 32VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:2,940
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Product details
Overview
STM8AL3166UAY 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 integrated LCD controller supporting up to 4×28 segments. It operates from 1.65 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 STM8AL3166UAY datasheet, STM8AL3166UAY pinout, STM8AL3166UAY application, or STM8AL3166UAY equivalent, key selection criteria include ultra-low-power operation (400 nA Halt mode), automotive qualification, integrated LCD driver capability, dual comparator wakeup, and SWIM-based non-intrusive debugging support for production firmware updates.
Technical Context
This MCU implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates dual crystal oscillators (1–16 MHz HSE, 32 kHz LSE), factory-trimmed 16 MHz RC, and 38 kHz low-consumption RC, all managed by a clock security system that triggers reset on oscillator failure.
The peripheral set includes two 16-bit general-purpose timers (IC/OC/PWM/encoder), one 16-bit advanced control timer for motor control, one 8-bit basic timer, two watchdogs (window + independent), beeper timer, SPI, I²C (400 kHz SMBus/PMBus), and USART with ISO 7816, IrDA, and LIN 2.0 support - all designed for deterministic real-time response in safety-critical automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | Harvard, 3-stage pipeline STM8 CPU delivering 16 CISC MIPS at 16 MHz - enables deterministic interrupt latency and efficient code density for resource-constrained automotive nodes. |
| Operating Voltage | 1.65 V to 3.6 V - supports direct connection to automotive battery rails with brown-out reset thresholds configurable down to 1.65 V. |
| Temperature Range | –40 °C to +125 °C - qualified per AEC-Q100 Grade 0 for under-hood and cabin-mounted automotive applications. |
| Low-Power Halt Current | 400 nA with PDR enabled - enables multi-year battery life in always-on sensor monitoring systems without external power gating. |
| ADC Performance | 12-bit resolution, 25-channel multiplexer, 1 MSPS sampling rate with internal temp sensor and reference voltage - supports high-accuracy analog sensing in HVAC and lighting control. |
| LCD Driver | Up to 4×28 segment drive with integrated step-up converter - eliminates external bias supply for automotive instrument cluster displays. |
| DAC Output | 12-bit buffered DAC on PB4–PB6 with monotonicity guaranteed - provides precise analog actuator control (e.g., LED dimming, valve positioning) without external DAC IC. |
Pinout & Package
LQFP32 package (7 × 7 mm, 0.8 mm pitch) with 32 pins; RoHS-compliant, ECOPACK2 certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD powers digital logic and I/O; VSS is common reference - supports separate analog/digital grounding for noise-sensitive ADC/DAC operation. |
| NRST | Active-low reset input | Asynchronous reset with programmable threshold; accepts external pull-up or microcontroller-driven assertion - ensures robust startup and fault recovery in noisy automotive environments. |
| SWIM | Single-wire interface for debug and programming | Non-intrusive in-circuit debugging and flash programming using only one pin - reduces PCB routing complexity and enables field firmware updates without JTAG header. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7 | General-purpose I/O ports | 41 total I/Os (32 available in LQFP32 variant); all mappable to interrupt vectors - enables flexible signal routing for CAN/LIN gateway peripherals and sensor interface consolidation. |
| OSC_IN / OSC_OUT | HSE crystal oscillator terminals | Supports 1–16 MHz external crystal - provides precise timing source for LIN communication and RTC synchronization with <±50 ppm stability. |
| LSE_IN / LSE_OUT | LSE crystal oscillator terminals | 32 kHz external crystal input for RTC - enables accurate calendar timekeeping and periodic wake-up from Halt mode with 0.95 ppm resolution. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power operation | 400 nA Halt mode with PDR, 1.3 μA active-halt with full RTC - extends battery life in always-on telematics and tire pressure monitoring systems. |
| AEC-Q100 qualification | Grade 0 (–40 °C to +125 °C), HTOL tested, ESD >2 kV HBM - meets automotive reliability requirements for front-end electronics without derating. |
| Integrated LCD controller | 4×28 segment drive with internal step-up converter - eliminates external charge pump and reduces BOM count in instrument cluster and center console displays. |
| Dual ultra-low-power comparators | One rail-to-rail, one fixed-threshold; both support wakeup from Halt - enables fast analog event detection (e.g., door open, seat occupancy) with sub-microamp quiescent current. |
| SWIM debug interface | Single-pin, non-intrusive programming and real-time variable inspection - simplifies production test and field firmware patching without dedicated debug headers. |
Applications
| Automotive Body Control Module | Smart Tire Pressure Sensor |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, mirrors, and interior lighting in modern vehicles. IC Role / Device Role / Timing Role: Main system controller executing LIN slave protocol, managing PWM-driven actuators, and polling discrete sensors via GPIO interrupts. Use Value: Ultra-low-power Halt mode (400 nA) enables continuous bus monitoring while maintaining <10 μA average system current during vehicle sleep. |
Use Scenario: Battery-powered TPMS node measuring pressure, temperature, and acceleration inside wheel assemblies. IC Role / Device Role / Timing Role: Sensor fusion hub running low-duty-cycle measurement cycles, waking every 30 s via RTC alarm to sample ADC and transmit via RF link. Use Value: 1.3 μA active-halt mode with RTC preserves calendar time and enables precise wakeup scheduling - extending CR2032 battery life beyond 7 years. |
| Automotive Instrument Cluster Display | LED-Based Cabin Lighting Controller |
Use Scenario: Driving information display with segmented LCD showing speed, fuel level, warning icons, and ambient temperature. IC Role / Device Role / Timing Role: Integrated LCD driver and real-time clock managing segment multiplexing, contrast control, and calendar-based backlight dimming. Use Value: On-chip step-up converter and 4×28 segment drive eliminate external bias supply and reduce display subsystem component count by ≥4 parts. |
Use Scenario: Adaptive interior lighting with RGB LED dimming, ambient light sensing, and user-presence detection. IC Role / Device Role / Timing Role: 12-bit DAC generating precise analog dimming references; comparators detecting IR proximity events; ADC reading ambient light sensor. Use Value: Monotonic 12-bit DAC output ensures flicker-free LED intensity transitions; ultra-low leakage I/O (50 nA) prevents parasitic discharge in high-impedance sensor circuits. |
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 |
|---|---|---|---|
| STM8AL3168UAY | Same die, but with 32-Kbyte Flash programmed with different option bytes - includes enhanced bootloader and extended memory protection features. | Required where secure firmware update and anti-rollback enforcement are mandated by OEM software architecture. | Select when cryptographic signature verification or dual-bank OTA updates are required; otherwise, STM8AL3166UAY offers identical peripheral and power performance at lower cost. |
| RL78/F13-GB | Renesas RL78 core (16-bit), 24 MHz max, 128 Kbyte Flash, 10 Kbyte RAM - higher code density and larger memory, but 1.2 μA Halt mode vs. 400 nA. | Better suited for complex gateway functions requiring CAN FD and larger RTOS footprint; less optimal for ultra-low-leakage sensor nodes. | Choose RL78/F13-GB only if CAN FD interface or >64 Kbyte code space is mandatory; STM8AL3166UAY delivers superior power efficiency for simple, cost-sensitive automotive endpoints. |
Compared with STM8AL3168UAY, the STM8AL3166UAY trades minor bootloader flexibility for lower unit cost and identical low-power performance; versus RL78/F13-GB, it achieves 3× lower Halt current and smaller footprint at the expense of CAN FD and larger memory - making it optimal for battery-constrained, single-function automotive sensors.
Availability
STM8AL3166UAY is available at Aetrix Electronics and suitable for automotive body electronics, tire pressure monitoring systems, instrument cluster displays, and LED lighting controllers requiring stable component supply across extended product lifecycles.
Supply support for STM8AL3166UAY 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, specializing in automotive, industrial, and power management solutions with vertical manufacturing capabilities and AEC-Q100-aligned quality systems.
The STM8AL3x series is designed specifically for ultra-low-power automotive applications demanding extended battery life, wide temperature operation, and integrated analog peripherals - targeting cost-sensitive yet safety-aware electronic control units in modern vehicles.
FAQ
What is the maximum operating frequency and corresponding power consumption in Run mode?
The STM8AL3166UAY operates at up to 16 MHz. At 16 MHz and 3.3 V, typical Run mode current is 195 μA/MHz + 440 μA = 3.56 mA. This includes core, peripheral, and memory activity; actual consumption scales linearly with clock frequency and supply voltage, enabling dynamic power scaling in automotive subsystems.
Does this MCU support LIN 2.0 communication, and what hardware resources enable it?
Yes, the USART peripheral supports LIN 2.0 protocol via automatic sync-break detection, checksum generation, and identifier filtering. It uses the same UART hardware block configured through dedicated LIN control registers - no external transceiver is needed for basic LIN slave functionality, reducing BOM and board area.
How many I/O pins are available in the LQFP32 package, and which ones support interrupt capability?
The LQFP32 package provides 25 usable I/O pins (excluding power, reset, and oscillator pins). All 25 I/Os - distributed across PA, PB, PC, and PD ports - are individually mappable to external interrupt vectors, enabling edge-triggered wakeup from any GPIO pin in Wait, Low-Power Wait, or Halt modes.
What is the accuracy specification of the integrated 12-bit ADC, and under what conditions is it guaranteed?
The 12-bit ADC achieves ±1.5 LSB INL and ±1 LSB DNL over temperature (–40 °C to +125 °C) and supply (2.4 V to 3.6 V) when using internal reference (VREF+ = VDDA). Accuracy is validated per Table 57 and Table 58 in DS7106 Rev 9, with 1 MSPS sampling supported at VDDA ≥ 2.5 V.
STM8AL3166UAY 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 ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AL3166UAY FAQ
1.How can I place an order for STM8AL3166UAY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AL3166UAY 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 STM8AL3166UAY reliable?
The price and inventory of STM8AL3166UAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AL3166UAY is usually 5 days.
3.What payment methods are accepted for STM8AL3166UAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AL3166UAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AL3166UAY?
STM8AL3166UAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AL3166UAY 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 STM8AL3166UAY?
For technical support, including STM8AL3166UAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AL3166UAY requirements.
6.How does Aetrix verify that STM8AL3166UAY is sourced from the original manufacturer or authorized distributors?
All STM8AL3166UAY 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 STM8AL3166UAY meets industry standards.
7.What is the process for return or replacement of STM8AL3166UAY?
All STM8AL3166UAY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AL3166UAY, 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 STM8AL3166UAY part is unused and in its original packaging.
Return procedure for STM8AL3166UAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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