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NXP Semiconductors K32L2B31VFM0A
- Part No.:
- K32L2B31VFM0A
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
K32L2B31VFM0A.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:167
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Product details
Overview
K32L2B31VFM0A from NXP is an ultra-low-power Arm® Cortex®-M0+ microcontroller with 256 kB Flash, 32 kB SRAM, cryptographic acceleration (AES/SHA/DES), TRNG, and CRC engine-designed for battery-operated smart locks, HVAC controllers, and secure IoT edge nodes.
For engineers reviewing the K32L2B31VFM0A datasheet, K32L2B31VFM0A pinout, K32L2B31VFM0A application, or K32L2B31VFM0A equivalent, key selection criteria include its 64-pin QFN package, 72 MHz max core frequency, LP UART/I²C/SPI interfaces, and support for multiple low-power modes including VLPR/VLPS/LPS.
Technical Context
The K32L2B31VFM0A integrates a 72 MHz Arm Cortex-M0+ core with a low-leakage silicon process, enabling sub-μA deep-sleep current and fast wake-up from VLPS mode in under 2 μs. It features dual low-power timers, independent RTC, and four periodic interrupt timers for deterministic timing control in energy-constrained systems.
Its mixed-signal subsystem includes a 16-bit ADC with configurable resolution and sample time, a 12-bit DAC with DMA support, two analog comparators with internal 6-bit DAC, and a 1.2 V high-accuracy internal voltage reference-enabling precision sensor interfacing without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+, 72 MHz max - delivers real-time responsiveness with minimal power draw in compact firmware footprints. |
| Memory | 256 kB Flash / 32 kB SRAM - supports feature-rich firmware with local data buffering and OTA update staging space. |
| Security | Hardware TRNG + CRC + MMCAU crypto accelerator (AES/SHA/DES) - enables secure boot, encrypted communication, and tamper-resistant key generation. |
| ADC | 16-bit SAR ADC, up to 1 MSPS - provides high-resolution analog sensing for temperature, pressure, or current monitoring with flexible sampling control. |
| Low-Power Modes | VLPW/VLPR/VLPS/LPS - achieves 1.12 μA in VLPS with RTC running, enabling multi-year battery life in coin-cell-powered devices. |
| Peripherals | 3× LP UART, 3× LP I²C, 3× LP SPI, USB FS, FlexIO, TSI (16-ch) - supports concurrent wired/wireless connectivity and capacitive touch HMI in single-chip designs. |
Pinout & Package
64-pin QFN (9 × 9 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad. Pinout validated per NXP reference schematic K32L2B31VFM0A Rev. 0 and MCUXpresso SDK v2.10 pin configuration files.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Supports 1.71–3.6 V operation; VDD pins distributed for noise isolation and low-impedance path to internal LDOs. |
| PTA0–PTA31 | GPIO with interrupt/DMA capability | Configurable as digital I/O, LP UART/I²C/SPI signals, or TSI electrodes-enables flexible peripheral mapping without PCB redesign. |
| USB_DP/USB_DM | USB 2.0 Full-Speed differential pair | Integrated 3.3 V regulator powers USB PHY; no external transceiver required for basic HID/comms applications. |
| ADC0_SE0–ADC0_SE15 | Analog input channels | 16 single-ended or 8 differential inputs; supports hardware-triggered conversions synchronized to PWM or timer events. |
| RTC_CLKIN | External 32.768 kHz crystal input | Enables precise timekeeping during VLPS mode; supports automatic clock source switching on crystal failure. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low-Power Architecture | 1.12 μA VLPS current with RTC active - extends battery life in door locks and thermostats beyond 5 years on CR2032. |
| Hardware Crypto Acceleration | MMCAU unit reduces AES-128 encryption latency by >10× vs. software-only - enables secure BLE pairing and firmware signing at runtime. |
| Capacitive Touch Interface | TSI supports 16 electrodes with automatic calibration and noise immunity - eliminates need for external touch controller in smart lighting panels. |
| Flexible Clock System | Multiple internal oscillators (IRC @ 48/60 MHz, LPO @ 1 kHz) + PLL + external crystal options - simplifies BOM and improves startup reliability across temperature ranges. |
| Boot ROM with Secure Bootloader | 16 kB ROM includes flash programming routines and secure boot validation - enables field firmware updates with signature verification and rollback protection. |
Applications
| Smart Door Locks | Building HVAC Controllers |
|---|---|
Use Scenario: Battery-powered electronic deadbolts requiring multi-year operation, BLE/Wi-Fi coexistence, and tamper detection. IC Role / Device Role / Timing Role: Main application MCU managing motor control, biometric authentication, secure wireless comms, and real-time access logging. Use Value: Sub-μA sleep current and hardware TRNG enable FIPS-compliant key generation and 7+ year CR2032 battery life without compromising security. | Use Scenario: Wall-mounted thermostats with ambient temperature/humidity sensing, display, and cloud connectivity via Wi-Fi/BLE gateway. IC Role / Device Role / Timing Role: Central sensor fusion and UI controller with integrated 16-bit ADC, TSI for touch buttons, and LP UART for modbus RTU communication. Use Value: On-chip 1.2 V reference and 16-bit ADC deliver ±0.1°C temperature accuracy; LP peripherals reduce gateway polling load and extend system uptime. |
| Industrial Sensor Nodes | Smart Lighting Control |
Use Scenario: Wireless vibration/temperature sensors deployed in factory automation environments with dust, EMI, and wide temperature swings. IC Role / Device Role / Timing Role: Edge-processing node performing FFT-based anomaly detection, CRC-protected data packaging, and scheduled LoRaWAN transmission. Use Value: Hardware CRC and low-leakage design ensure data integrity and 3+ year battery life at -40°C to +85°C without derating. | Use Scenario: DALI-2 or 0–10 V dimmable LED drivers with local occupancy sensing and color-tuning via RGBW output. IC Role / Device Role / Timing Role: Dimming controller with 12-bit DAC for analog output, PWM generator for LED current regulation, and TSI for physical button interface. Use Value: Integrated DAC + PWM eliminates external DAC IC; TSI with auto-calibration maintains button responsiveness across humidity variations in ceiling-mounted fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| EFM32PG12B500F1024GL125 | ARM Cortex-M4F @ 40 MHz, 1024 kB Flash, 256 kB RAM, no USB FS, higher active power | Better for DSP-heavy sensor fusion; lacks integrated USB and TRNG | Choose when floating-point math or larger code footprint outweighs USB and crypto needs |
| STM32L432KCU6 | Cortex-M4 @ 80 MHz, 256 kB Flash, 64 kB RAM, USB FS, no hardware TRNG, AES only | Stronger compute for GUI or protocol stacks; weaker security primitives than K32L2B31VFM0A | Prefer when leveraging STM32Cube ecosystem and lower-cost toolchain licensing is critical |
Compared with EFM32PG12B500F1024GL125 and STM32L432KCU6, the K32L2B31VFM0A uniquely balances sub-μA sleep, full USB FS, hardware TRNG, and AES/SHA acceleration in a 64-pin QFN-making it optimal for cost-sensitive, battery-powered security and building automation endpoints where cryptographic integrity and long service life are non-negotiable.
Availability
K32L2B31VFM0A is available at Aetrix Electronics and suitable for smart door locks, HVAC controllers, and industrial sensor nodes requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for medical-grade and UL-certified designs.
Supply support for K32L2B31VFM0A 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
NXP Semiconductors is a global leader in secure connectivity solutions for automotive, industrial, and IoT markets, with over 40 years of embedded systems expertise and ISO 9001/ISO 14001 certified manufacturing.
The K32L2 MCU family targets power-constrained, security-critical edge devices-specifically designed to replace discrete security + MCU combinations in smart home, building automation, and industrial sensing applications.
FAQ
What is the maximum operating frequency of the K32L2B31VFM0A?
The K32L2B31VFM0A operates at a maximum core frequency of 72 MHz using its internal high-frequency IRC oscillator or external crystal with PLL multiplication. This frequency is fully supported across the full industrial temperature range (-40°C to +105°C) and all low-power modes except VLPR, where it is limited to 48 MHz for optimal power efficiency.
Does the K32L2B31VFM0A support USB device functionality?
Yes, the K32L2B31VFM0A integrates a full-speed USB 2.0 device controller with an on-chip 3.3 V regulator, supporting HID, CDC, and MSC class implementations without external PHY components. The USB module remains functional in Run and Wait modes and can wake the core from VLPS mode upon bus activity.
What low-power modes are available on the K32L2B31VFM0A?
The K32L2B31VFM0A supports five low-power modes: RUN, WAIT, VLPR (Very Low Power Run), VLPS (Very Low Power Stop), and LPS (Low Power Stop). In VLPS mode with RTC enabled, it draws just 1.12 μA; in LPS mode with RAM retention, it consumes 1.8 μA. All modes retain GPIO state and allow selective peripheral clock gating.
Is the K32L2B31VFM0A pin-compatible with other K32L2 family members?
No, the K32L2B31VFM0A is not pin-compatible with K32L2A-series parts due to differences in peripheral mapping and power domain routing. However, within the K32L2B subfamily (e.g., K32L2B11/K32L2B21/K32L2B31), the 64-pin QFN variant shares identical pinout and package dimensions, enabling memory-scaling upgrades without PCB revision.
What security features does the K32L2B31VFM0A include?
The K32L2B31VFM0A includes a hardware True Random Number Generator (TRNG), cyclic redundancy check (CRC) engine, and the MMCAU cryptographic acceleration unit supporting AES-128/256, SHA-1/256, DES, and 3DES. These features are accessible via the MCUXpresso SDK's secure boot and crypto libraries and operate independently of the main CPU to preserve real-time performance.
K32L2B31VFM0A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- K32 L2
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M0+
- Core Size:
- 32-Bit Single-Core
- Speed:
- 48MHz
- Connectivity:
- FlexIO, I2C, SPI, TSI, UART/USART, USB
- Peripherals:
- DMA, LCD, PWM, WDT
- Number of I/O:
- -
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 32K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.2V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
K32L2B31VFM0A FAQ
1.How can I place an order for K32L2B31VFM0A through Aetrix?
Please submit a Request for Quotation (RFQ) for K32L2B31VFM0A 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 K32L2B31VFM0A reliable?
The price and inventory of K32L2B31VFM0A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for K32L2B31VFM0A is usually 5 days.
3.What payment methods are accepted for K32L2B31VFM0A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for K32L2B31VFM0A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for K32L2B31VFM0A?
K32L2B31VFM0A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your K32L2B31VFM0A 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 K32L2B31VFM0A?
For technical support, including K32L2B31VFM0A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your K32L2B31VFM0A requirements.
6.How does Aetrix verify that K32L2B31VFM0A is sourced from the original manufacturer or authorized distributors?
All K32L2B31VFM0A 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 K32L2B31VFM0A meets industry standards.
7.What is the process for return or replacement of K32L2B31VFM0A?
All K32L2B31VFM0A units undergo pre-shipment inspection (PSI). If there is an issue with K32L2B31VFM0A, 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 K32L2B31VFM0A part is unused and in its original packaging.
Return procedure for K32L2B31VFM0A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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