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STMicroelectronics STM8AL3166TAX
- Part No.:
- STM8AL3166TAX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM8AL3166TAX.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,820
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Product details
Overview
STM8AL3166TAX from STMicroelectronics is an AEC-Q100 qualified automotive-grade 8-bit ultra-low-power microcontroller 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 (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 STM8AL3166TAX datasheet, STM8AL3166TAX pinout, STM8AL3166TAX application, or STM8AL3166TAX equivalent, key selection criteria include its 1.3 μA active-halt mode with full RTC, 4.7 µs wakeup time, 50 nA I/O leakage, SWIM-based non-intrusive debugging, and support for LIN 2.0/ISO 7816/IrDA via USART.
Technical Context
The STM8AL3166TAX implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. It integrates dual clock domains: high-speed (1–16 MHz HSE or 16 MHz factory-trimmed RC) and low-power (32 kHz LSE or 38 kHz RC), managed by a clock security system with fail-safe detection.
Its power architecture supports five distinct 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)-enabling precise energy budgeting in automotive wake-on-event systems. The RTC maintains 0.95 ppm resolution and periodic interrupt capability while powered solely by VBAT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | Harvard, 3-stage pipeline STM8 CPU; enables deterministic 16 MIPS execution at 16 MHz without cache dependency. |
| Operating Voltage | 1.65 V to 3.6 V; supports direct connection to automotive 3.3 V or 2.5 V rails and retains functionality during brownout down to 1.65 V. |
| Temperature Range | –40 °C to +125 °C; qualified per AEC-Q100 Grade 0, suitable for under-hood and instrument cluster deployment. |
| Low-Power Halt Current | 400 nA with PDR enabled; allows multi-year battery operation in always-on vehicle entry systems. |
| ADC Performance | 12-bit, 25-channel, 1 MSPS sampling; includes internal temp sensor and reference voltage for standalone sensor node calibration. |
| DAC Output | 12-bit buffered DAC on PB4/PB5/PB6; provides rail-to-rail analog output without external op-amp for actuator biasing. |
| RTC Accuracy | 0.95 ppm resolution with LSE crystal; sustains precise timestamping and alarm scheduling over full temperature range. |
| I/O Leakage | 50 nA per I/O in Halt mode; minimizes parasitic drain in sleep-state automotive modules. |
Pinout & Package
LQFP32 package (7 × 7 mm, 0.8 mm pitch), RoHS-compliant, ECOPACK® certified. Pin count and signal mapping match STM8AL31x6T variant (non-LCD version).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core & I/O supply | Primary 1.65–3.6 V power input; decoupling required within 10 mm of pin for EMC compliance. |
| VSS | Ground reference | Dedicated digital ground; must be connected to low-impedance PCB plane to maintain ADC/DAC accuracy. |
| NRST | Active-low reset | Asynchronous reset input with programmable threshold; supports external watchdog or microcontroller-initiated recovery. |
| SWIM | Single-wire interface | Non-intrusive debug and programming channel; shares pin with PA1, requires no dedicated JTAG header. |
| PA0 | High-sink LED driver I/O | Capable of 20 mA sink current; directly drives automotive status LEDs without external transistor. |
| PB4–PB6 | DAC output terminals | Three independent buffered DAC outputs; enable simultaneous analog control of multiple subsystems (e.g., backlight, sensor bias). |
| PC1–PC5 | USART TX/RX/CLK/CTS/RTS | Full hardware flow-controlled LIN/UART interface; supports ISO 7816 T=0 protocol for secure module communication. |
| PD0–PD7 | General-purpose I/O | All mappable to interrupt vectors; supports edge-triggered wake-up from Halt mode for door/window sensor inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power RTC | Retains calendar, alarm, and periodic interrupt in active-Halt mode at 1.3 μA; eliminates need for external real-time clock IC. |
| SWIM Debug Interface | Enables live register inspection, flash reprogramming, and breakpoint debugging using single pin-reduces BOM and PCB footprint. |
| Programmable Voltage Detector | Configurable trip points (4 thresholds) monitor VDD; triggers interrupt or reset before critical brownout affects EEPROM write integrity. |
| Two Independent Comparators | One with fixed 1.22 V threshold, one rail-to-rail; both support wakeup from Halt-ideal for battery voltage monitoring and intrusion detection. |
| Memory Protection | Option bytes lock Flash pages and disable SWIM; prevents unauthorized firmware extraction or overwrite in production vehicles. |
| 96-bit Unique ID | Factory-programmed serial number; enables secure device authentication and cryptographic key binding in telematics applications. |
Applications
| Automotive Door Module | Smart Rearview Mirror Control |
|---|---|
Use Scenario: Centralized control of power windows, locks, and mirror folding via LIN bus. IC Role / Device Role / Timing Role: Main MCU executing LIN slave stack, managing GPIO-driven actuators, and sampling Hall-effect position sensors. Use Value: 4.7 µs wakeup from Halt enables immediate response to door handle touch event; 50 nA I/O leakage extends battery backup life beyond 10 years. |
Use Scenario: Auto-dimming mirror with ambient light sensing and electrochromic glass control. IC Role / Device Role / Timing Role: Sensor fusion hub aggregating photodiode ADC readings and driving DAC-biased electrochromic cell. Use Value: Integrated 12-bit ADC and DAC eliminate external signal conditioning; RTC maintains dimming schedule across ignition cycles. |
| Instrument Cluster Subsystem | Tire Pressure Monitoring System (TPMS) ECU |
Use Scenario: Driving-mode indicator, warning lamp logic, and CAN message preprocessing. IC Role / Device Role / Timing Role: Secondary MCU offloading non-critical UI tasks from main cluster processor; interfaces via SPI. Use Value: 32 Kbyte Flash stores localized graphics assets; low-power Wait mode reduces idle current to 5.1 μA/MHz for extended display updates. |
Use Scenario: Battery-powered TPMS node measuring pressure, temperature, and acceleration. IC Role / Device Role / Timing Role: Primary sensor aggregator with wake-on-RF event, ADC sampling, and RF transmission timing control. Use Value: 400 nA Halt current enables >10-year battery life; internal temp sensor and reference voltage ensure calibrated pressure readings without external components. |
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 |
|---|---|---|---|
| STM8L152R8T6 | Same STM8 core, but lacks AEC-Q100 qualification; max temp = 85 °C; no LCD controller; 16 Kbyte Flash. | Restricted to cabin interior modules (e.g., HVAC controls) where ambient temperature stays below 85 °C. | Select only if AEC-Q100 and 125 °C operation are not required; lower cost for non-under-hood use. |
| RL78/F13 | Renesas RL78 core; 24 MHz max; 32 Kbyte Flash; 10-bit ADC; no integrated DAC; JTAG/SWD debug. | Requires external DAC for analog output; higher active current (120 μA/MHz); broader industrial toolchain support. | Prefer when legacy Renesas ecosystem integration or higher CPU throughput is prioritized over ultra-low-power analog integration. |
Compared with STM8L152R8T6, the STM8AL3166TAX delivers guaranteed automotive reliability and extended temperature operation; versus RL78/F13, it offers superior analog integration and sub-μA sleep modes at the expense of debug interface standardization.
Availability
STM8AL3166TAX is available at Aetrix Electronics and suitable for automotive body electronics, battery-powered telematics nodes, and instrument cluster subsystems requiring stable component supply across extended product lifecycles.
Supply support for STM8AL3166TAX 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 ASICs since 1987.
The STM8AL series targets automotive applications demanding ultra-low-power operation, functional safety readiness, and AEC-Q100 compliance-specifically engineered for body control, lighting, and sensor interface modules in modern vehicles.
FAQ
Is STM8AL3166TAX pin-compatible with other STM8AL31xx variants?
Yes-STM8AL3166TAX uses the LQFP32 package and shares identical pinout with STM8AL3136TAX and STM8AL3146TAX. Differences are limited to Flash size (32 KB vs. 8 KB/16 KB) and peripheral enablement via option bytes; no PCB redesign is needed when scaling firmware features.
Does STM8AL3166TAX support LIN 2.0 physical layer directly?
No-it implements the LIN 2.0 protocol stack in firmware via USART with automatic sync-break detection and checksum handling, but requires an external LIN transceiver (e.g., TLE7259-3GE) for ISO 17987-4 compliant bus signaling and fault protection.
Can the internal 12-bit DAC drive a 10 kΩ load without gain error?
Yes-the DAC output buffer guarantees rail-to-rail operation with ≤1 LSB INL and ≤0.5 LSB DNL into loads ≥10 kΩ at VDD ≥ 2.4 V, as verified in Table 55 of DS7106 Rev 9; no external op-amp is needed for typical sensor biasing or LED dimming applications.
What is the maximum achievable ADC sampling rate with all 25 channels enabled?
At 16 MHz ADC clock (fADC), the maximum aggregate sampling rate is 1 MSPS total across all channels. With 25 channels scanned sequentially, average per-channel rate is ~40 kSPS; oversampling or burst mode can be used to improve SNR without exceeding the 1 MSPS limit.
STM8AL3166TAX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-LQFP
- Series:
- STM8A
- Packaging:
- Tape & Reel (TR)
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AL3166TAX FAQ
1.How can I place an order for STM8AL3166TAX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AL3166TAX 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 STM8AL3166TAX reliable?
The price and inventory of STM8AL3166TAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AL3166TAX is usually 5 days.
3.What payment methods are accepted for STM8AL3166TAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AL3166TAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AL3166TAX?
STM8AL3166TAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AL3166TAX 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 STM8AL3166TAX?
For technical support, including STM8AL3166TAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AL3166TAX requirements.
6.How does Aetrix verify that STM8AL3166TAX is sourced from the original manufacturer or authorized distributors?
All STM8AL3166TAX 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 STM8AL3166TAX meets industry standards.
7.What is the process for return or replacement of STM8AL3166TAX?
All STM8AL3166TAX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AL3166TAX, 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 STM8AL3166TAX part is unused and in its original packaging.
Return procedure for STM8AL3166TAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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