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STMicroelectronics STM8AL3146UCY
- Part No.:
- STM8AL3146UCY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
STM8AL3146UCY.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 32VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:2,432
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Product details
Overview
STM8AL3146UCY from STMicroelectronics is an AEC-Q100 qualified automotive-grade 8-bit ultra-low-power microcontroller featuring 16 MHz STM8 core, 32 Kbyte Flash, 1 Kbyte data EEPROM, 2 Kbyte RAM, RTC, 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, and multiple timers including advanced control timer for motor control. It operates from 1.65 V to 3.6 V across –40 °C to 125 °C and targets battery-powered automotive body electronics.
For engineers reviewing the STM8AL3146UCY datasheet, STM8AL3146UCY pinout, STM8AL3146UCY application, or STM8AL3146UCY equivalent, key selection criteria include ultra-low-power operation (400 nA Halt mode), integrated LCD driver, automotive qualification, and SWIM-based non-intrusive debugging support.
Technical Context
The STM8AL3146UCY implements a Harvard-architecture 3-stage pipeline STM8 core delivering 16 CISC MIPS at 16 MHz, with up to 40 external interrupt sources and fast 4.7 µs wakeup from Halt mode. 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 with clock security system.
Power management includes five low-power modes-Wait, low-power Run (5.1 μA), low-power Wait (3 μA), active-Halt with full RTC (1.3 μA), and Halt with PDR (400 nA)-plus programmable voltage detector (PVD) and BOR with five selectable thresholds. The RTC provides BCD calendar, alarm, and auto-wakeup with 0.95 ppm resolution.
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 automotive ambient conditions. |
| Flash Memory | 32 Kbyte; supports 20-year data retention at 55 °C and in-system programming via SWIM interface for field updates. |
| Data EEPROM | 1 Kbyte true EEPROM; rated for 300 kwrite cycles and used for calibration storage, odometer logging, and configuration persistence. |
| Operating Voltage Range | 1.65 V to 3.6 V; ensures reliable operation during cold-crank (low-battery) and load-dump transients in 12 V automotive systems. |
| Temperature Range | –40 °C to +125 °C; meets AEC-Q100 Grade 0 requirements for under-hood and body-control module deployment. |
| Low-Power Halt Current | 400 nA with PDR enabled; enables multi-year battery life in always-on automotive sensors and door modules. |
Pinout & Package
LQFP32 package (7 × 7 mm, 0.8 mm pitch), RoHS-compliant, ECOPACK2 qualified. Pin count and I/O mapping optimized for compact automotive control nodes requiring LCD, analog sensing, and serial communication.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual VDD/VSS pairs ensure stable core and I/O domain operation; decoupling required per datasheet layout guidelines. |
| NRST | Active-low reset input | Accepts external reset pulses; internal BOR/POR logic ensures robust startup under varying battery conditions. |
| SWIM | Single-wire interface for debug/programming | Enables non-intrusive in-circuit debugging and flash programming without halting real-time peripherals. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7 | General-purpose I/O with interrupt capability | All 41 I/Os are mappable to interrupt vectors; PA0 supports high-sink LED driver (20 mA) for direct segment drive. |
| OSC_IN / OSC_OUT | HSE crystal oscillator terminals | Supports 1–16 MHz external crystal for precise timing in LIN/USART and RTC applications. |
| LSE_IN / LSE_OUT | LSE crystal oscillator terminals | Drives 32.768 kHz crystal for RTC calendar and ultra-low-power wake-up events. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power RTC with BCD calendar | 0.95 ppm resolution and periodic interrupt capability enable accurate timekeeping and scheduled wake-up in Halt mode. |
| Integrated LCD controller (4×28) | On-chip step-up converter and bias generation eliminate external components for automotive instrument cluster displays. |
| Dual ultra-low-power comparators | One rail-to-rail comparator with wakeup capability and one fixed-threshold comparator for windowed voltage monitoring. |
| 12-bit DAC with output buffer | Provides monotonic 12-bit analog output on PB4–PB6; supports closed-loop sensor biasing and reference generation. |
| Advanced control timer (TIM1) | Three-channel 16-bit timer with dead-time insertion and complementary outputs for BLDC motor gate driving. |
Applications
| Automotive Door Module | Smart Rearview Mirror Control |
|---|---|
Use Scenario: Centralized control of power windows, locks, mirrors, and interior lighting in vehicle door assemblies. IC Role / Device Role / Timing Role: Main MCU managing LIN communication, analog sensor inputs (position, temperature), PWM-driven actuators, and non-volatile parameter storage. Use Value: 400 nA Halt current extends battery backup life; integrated comparators monitor switch status without external circuitry. |
Use Scenario: Auto-dimming mirror with ambient light sensing, glare detection, and electrochromic control. IC Role / Device Role / Timing Role: Sensor fusion node processing photodiode signals, driving DAC-controlled mirror bias, and communicating over I²C to main ECU. Use Value: 12-bit ADC with internal reference enables precise light-level measurement; RTC triggers periodic self-calibration routines. |
| Engine Bay Temperature Logger | Body Control Module (BCM) Subnode |
Use Scenario: Standalone thermal logger mounted near intake manifold or exhaust system for diagnostics and warranty analysis. IC Role / Device Role / Timing Role: Ultra-low-power data acquisition unit sampling temperature sensor every 10 seconds, storing timestamps and values in EEPROM. Use Value: Active-Halt mode (1.3 μA) with RTC wake-up allows years of operation on coin cell; 300 kcycle EEPROM endurance supports long-term logging. |
Use Scenario: Secondary control node managing trunk release, hazard lights, and seatbelt chime in distributed BCM architecture. IC Role / Device Role / Timing Role: LIN slave MCU receiving commands from master BCM, executing local actuation, and reporting status via USART. Use Value: SWIM debug interface enables field firmware updates without removing PCB; 41 GPIOs support mixed digital/analog peripheral expansion. |
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 |
|---|---|---|---|
| STM8AL3L46UCY | Includes integrated LCD controller (4×28); same Flash/RAM/ADC/DAC specs but adds step-up converter and bias generator. | Required for automotive displays (e.g., HVAC panels); not needed if LCD is absent or externally driven. | Select STM8AL3L46UCY only when on-chip LCD driving is mandatory; otherwise STM8AL3146UCY reduces BOM cost and layout complexity. |
| RL78/F13-GB | Renesas RL78 core (16-bit), 32 Kbyte Flash, 2.7–5.5 V operation, 10-bit ADC, no integrated LCD; lower standby current (230 nA) but lacks RTC auto-wakeup resolution. | Better suited for non-LCD, higher-voltage industrial sensors; lacks AEC-Q100 Grade 0 rating and automotive-specific BOR thresholds. | Choose RL78/F13-GB for broader voltage range and lower standby current where AEC-Q100 Grade 0 and LCD are not required. |
Compared with STM8AL3L46UCY, STM8AL3146UCY removes LCD hardware to reduce cost and power in non-display applications; compared with RL78/F13-GB, it offers tighter automotive qualification, superior RTC precision, and native SWIM debug-but requires stricter 1.65–3.6 V supply design.
Availability
STM8AL3146UCY is available at Aetrix Electronics and suitable for automotive body electronics, battery-powered sensor nodes, and engine bay monitoring systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for STM8AL3146UCY 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 ICs with strong emphasis on functional safety and AEC-Q100 compliance.
The STM8AL3x automotive MCU family is designed specifically for ultra-low-power body electronics applications-including door modules, mirror controls, and thermal loggers-where extended battery life, high-temperature resilience, and ASIL-ready peripherals are essential.
FAQ
What is the maximum operating temperature for STM8AL3146UCY?
The STM8AL3146UCY is rated for continuous operation from –40 °C to +125 °C, meeting AEC-Q100 Grade 0 requirements. This specification is validated per DS7106 Rev 9 Section 9.3.1, with thermal derating applied above 85 °C for sustained Flash write operations.
Does STM8AL3146UCY support in-system programming without removing the chip?
Yes. STM8AL3146UCY supports single-wire in-circuit programming and debugging via the SWIM interface using standard ST-LINK/V2 or compatible tools. No bootloader firmware is required, and programming occurs at full speed without halting real-time peripherals.
Can the 12-bit DAC output drive external loads directly?
The integrated 12-bit DAC features an output buffer capable of sourcing/sinking ±5 mA at VDD = 3.0 V (per DS7106 Rev 9 Table 53). It can directly drive low-impedance references or op-amp inputs but requires external buffering for loads exceeding 5 mA or requiring rail-to-rail swing.
Is the RTC functional in Halt mode with power-down reset enabled?
Yes. The RTC remains fully operational in active-Halt mode (1.3 μA) when clocked by the LSE oscillator, supporting BCD calendar, alarm interrupts, and periodic wake-up. In Halt mode with PDR (400 nA), RTC is disabled unless explicitly configured to run from LSE with backup domain powered.
STM8AL3146UCY 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:
- STM8A
- 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:
- 16KB (16K 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:
STM8AL3146UCY FAQ
1.How can I place an order for STM8AL3146UCY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AL3146UCY 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 STM8AL3146UCY reliable?
The price and inventory of STM8AL3146UCY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AL3146UCY is usually 5 days.
3.What payment methods are accepted for STM8AL3146UCY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AL3146UCY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AL3146UCY?
STM8AL3146UCY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AL3146UCY 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 STM8AL3146UCY?
For technical support, including STM8AL3146UCY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AL3146UCY requirements.
6.How does Aetrix verify that STM8AL3146UCY is sourced from the original manufacturer or authorized distributors?
All STM8AL3146UCY 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 STM8AL3146UCY meets industry standards.
7.What is the process for return or replacement of STM8AL3146UCY?
All STM8AL3146UCY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AL3146UCY, 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 STM8AL3146UCY part is unused and in its original packaging.
Return procedure for STM8AL3146UCY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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