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STMicroelectronics STM8AL31E88TCX
- Part No.:
- STM8AL31E88TCX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM8AL31E88TCX.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,973
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Product details
Overview
STM8AL31E88TCX from STMicroelectronics is an AEC-Q100 Grade 1 qualified automotive 8-bit ultra-low-power MCU featuring 64 KB Flash, 2 KB data EEPROM with ECC, 4 KB RAM, 12-bit ADC (1 Msps, 28 channels), dual 12-bit DACs, LCD controller (8×40), AES hardware accelerator, RTC with ±0.5 ppm accuracy, and five low-power modes down to 400 nA. It operates from 1.65–3.6 V across –40 to 125 °C and targets body control modules, dashboard instrumentation, and smart sensors in battery-constrained automotive systems.
For engineers reviewing the STM8AL31E88TCX datasheet, STM8AL31E88TCX pinout, STM8AL31E88TCX application, or STM8AL31E88TCX equivalent, key selection considerations include its ultra-low-power RTC performance, dual DAC output buffering, 67 GPIOs with interrupt mapping, SWIM-based non-intrusive debugging, and automotive-grade reliability under extended temperature and voltage stress.
Technical Context
The STM8AL31E88TCX implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates dual crystal oscillators (32 kHz LSE + 1–16 MHz HSE), factory-trimmed 16 MHz RC, and clock security system for fail-safe operation.
Power management includes five programmable low-power modes-Halt (400 nA), Active-halt with full RTC (1.4 µA), Low-power wait (3 µA), Low-power run (5.9 µA), and Wait-with fast wake-up (4.7 µs) and per-I/O leakage as low as 50 nA. The embedded reset block offers 5-level BOR, POR/PDR, and PVD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8 8-bit Harvard, 3-stage pipeline, 16 MIPS @ 16 MHz - enables deterministic real-time control with minimal code footprint. |
| Memory | 64 KB Flash + 2 KB EEPROM (ECC, RWW) + 4 KB RAM - supports robust firmware updates and secure parameter storage without external memory. |
| ADC | 12-bit, 1 Msps, 28 channels with temp sensor & internal Vref - delivers high-resolution analog sensing for battery monitoring and thermal management. |
| DAC | Two 12-bit buffered DACs (PB4/PB5/PB6) - enables precise analog waveform generation or biasing for sensor excitation or display drivers. |
| RTC Accuracy | ±0.5 ppm with digital calibration - ensures calendar timekeeping stability over automotive temperature range without external compensation. |
| Low-Power Halt Current | 400 nA @ VDD = 1.65–3.6 V - allows multi-year operation on coin-cell batteries in always-on vehicle subsystems. |
| AES Accelerator | Hardware AES-128 engine - offloads encryption/decryption for secure firmware updates and CAN message authentication. |
| Operating Temp | –40 to +125 °C - certified for under-hood and powertrain-adjacent applications meeting AEC-Q100 Grade 1 requirements. |
Pinout & Package
LQFP80 package (14 × 14 mm, 0.5 mm pitch), thermally enhanced for automotive ambient conditions. Pin count and I/O mapping align with STM8AL31E8A variant; LCD functionality disabled in STM8AL31E8x series.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply / Ground | Dual VDD/VSS pairs ensure stable core and I/O rail decoupling; supports independent analog/digital domain isolation. |
| NRST | Active-low reset input | Internal pull-up; accepts external reset assertion and supports low-power POR/PDR/BOR with 5 threshold levels. |
| SWIM | Single-wire interface module | Enables non-intrusive debugging and flash programming using one dedicated pin - no debug header required. |
| PA0–PA7, PB0–PB7, etc. | General-purpose I/O | All 67 GPIOs support interrupt vector mapping, alternate functions (USART, SPI, I²C), and ultra-low leakage (50 nA). |
| OSC_IN/OSC_OUT | HSE crystal oscillator terminals | Supports 1–16 MHz external crystal; paired with clock security system to detect oscillator failure and trigger safe state transition. |
| LSE_IN/LSE_OUT | LSE crystal oscillator terminals | Drives 32.768 kHz RTC crystal; enables ultra-low-power calendar operation with ±0.5 ppm accuracy and digital calibration. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power RTC with anti-tamper detection | Enables secure, battery-backed calendar/timekeeping with tamper event logging - critical for warranty metering and service interval tracking. |
| Dual 12-bit DACs with output buffer | Provides rail-to-rail analog outputs without external op-amps - simplifies sensor excitation (e.g., RTD, strain gauge) and LCD contrast control. |
| Hardware AES-128 accelerator | Reduces encryption latency by >10× vs. software-only implementation - essential for secure OTA firmware updates in connected ECUs. |
| Four-channel DMA controller | Offloads CPU during ADC sampling, USART transfers, and AES operations - preserves low-power mode residency and deterministic timing. |
| Three USARTs with LIN 1.3/2.0 support | Enables native LIN bus communication without external transceivers - reduces BOM cost and PCB area in body electronics nodes. |
| Programmable voltage detector (PVD) | Allows dynamic brown-out response at user-defined thresholds - prevents erratic behavior during battery voltage sag in start-stop systems. |
Applications
| Body Control Module (BCM) | Automotive Dashboard Cluster |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, lighting, and mirror adjustment in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Main system controller managing PWM-driven actuators, LIN-slave communication, and real-time fault logging via RTC timestamping. Use Value: Ultra-low-power Halt mode extends sleep current below 500 nA, enabling BCM to remain responsive to key-fob wake events while minimizing parasitic drain. |
Use Scenario: Driving analog gauges, LED backlighting, and warning indicators in instrument clusters with limited thermal budget. IC Role / Device Role / Timing Role: Mixed-signal controller interfacing with 12-bit ADC (for analog needle position feedback) and dual DACs (for stepper motor coil drive and LCD bias). Use Value: Integrated LCD controller (8×40) eliminates external segment driver IC, reducing component count and EMI emissions in safety-critical displays. |
| Smart Battery Sensor (SBS) | Engine Bay Ambient Monitor |
Use Scenario: Monitoring battery voltage, current, temperature, and state-of-health in 48 V mild-hybrid systems. IC Role / Device Role / Timing Role: Precision analog front-end host with 28-channel ADC, internal reference, and temp sensor - performing synchronized multi-parameter acquisition. Use Value: 1 Msps sampling rate and ECC-protected EEPROM enable reliable long-term data logging of battery degradation trends without external FRAM/NVRAM. |
Use Scenario: Measuring under-hood temperature, humidity, and pressure for thermal management and emission control algorithms. IC Role / Device Role / Timing Role: Environmental sensor hub with AES-secured data transmission over CAN/LIN and calibrated RTC for time-stamped diagnostics. Use Value: AEC-Q100 Grade 1 qualification and –40 to +125 °C operation ensure functional integrity in direct engine compartment mounting without heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8AL3L88TCX | 48 KB Flash, no AES accelerator, same 64 KB-equivalent peripheral set except reduced DAC channel count. | Suitable for cost-sensitive entry-level BCMs where cryptographic features are not required. | Select when AES and full 64 KB Flash are unnecessary - reduces unit cost without sacrificing core low-power or automotive qualification. |
| RL78/F13-GB | Renesas RL78 core, 32 KB Flash, 2 KB RAM, 10-bit ADC, no hardware AES, JTAG/SWD debug. | Targets similar body electronics but lacks RTC accuracy calibration and ultra-low-power Halt mode (<1 µA). | Choose if toolchain alignment with Renesas ecosystem or higher interrupt priority depth is prioritized over sub-µA sleep current. |
Compared with STM8AL31E88TCX, STM8AL3L88TCX trades AES and Flash capacity for lower cost in non-security applications, while RL78/F13-GB offers different architecture trade-offs - notably higher interrupt nesting but weaker low-power retention and no calibrated RTC.
Availability
STM8AL31E88TCX is available at Aetrix Electronics and suitable for automotive body control modules, dashboard instrumentation, smart battery sensors, and engine bay ambient monitors requiring stable component supply across extended temperature and voltage ranges.
Supply support for STM8AL31E88TCX 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 components.
The STM8AL ultra-low-power 8-bit MCU family targets automotive body electronics and chassis applications demanding AEC-Q100 compliance, extended temperature operation, and multi-year battery life - with emphasis on integrated analog peripherals and secure firmware execution.
FAQ
What is the maximum operating frequency and corresponding power consumption in Run mode?
The STM8AL31E88TCX achieves 16 MHz maximum CPU frequency. At 16 MHz and 3.3 V, typical active current is 200 µA/MHz + 330 µA, totaling ~3.53 mA. This includes core, peripheral, and I/O activity - verified per Table 21 in DocID027180 Rev 5 under standard load conditions.
Does the device support hardware-based AES encryption, and what key lengths are supported?
Yes, it integrates a dedicated hardware AES-128 accelerator compliant with FIPS-197. Only 128-bit keys are supported; no AES-192 or AES-256 acceleration is implemented. The engine operates in ECB/CBC modes and interfaces directly with DMA for zero-CPU-overhead bulk encryption.
How many GPIO pins support external interrupt capability, and are they all individually maskable?
All 67 I/O pins support external interrupt generation and are individually mappable to 40 interrupt vectors. Each pin's interrupt enable, edge sensitivity (rising/falling/both), and priority level are configurable via dedicated registers - confirmed in Section 3.2.2 and Table 11 of the datasheet.
What LCD configuration does the STM8AL31E88TCX support, and is the step-up converter integrated?
It supports up to 8×40 or 4×44 segment LCDs with integrated step-up converter (charge pump) capable of generating up to 5.5 V from 1.8–3.6 V supply - enabling direct driving of multiplexed LCD glass without external boost ICs, as specified in Section 3.6 and Table 48.
STM8AL31E88TCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-LQFP
- Series:
- STM8A
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- 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:
- 41
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 4K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.65V ~ 3.6V
- Data Converters:
- A/D 25x12b; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AL31E88TCX FAQ
1.How can I place an order for STM8AL31E88TCX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AL31E88TCX 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 STM8AL31E88TCX reliable?
The price and inventory of STM8AL31E88TCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AL31E88TCX is usually 5 days.
3.What payment methods are accepted for STM8AL31E88TCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AL31E88TCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AL31E88TCX?
STM8AL31E88TCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AL31E88TCX 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 STM8AL31E88TCX?
For technical support, including STM8AL31E88TCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AL31E88TCX requirements.
6.How does Aetrix verify that STM8AL31E88TCX is sourced from the original manufacturer or authorized distributors?
All STM8AL31E88TCX 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 STM8AL31E88TCX meets industry standards.
7.What is the process for return or replacement of STM8AL31E88TCX?
All STM8AL31E88TCX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AL31E88TCX, 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 STM8AL31E88TCX part is unused and in its original packaging.
Return procedure for STM8AL31E88TCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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