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NXP Semiconductors K32L2B31VFT0A
- Part No.:
- K32L2B31VFT0A
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 48-UFQFN Exposed Pad
- Datasheet:
-
K32L2B31VFT0A.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,070
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Product details
Overview
K32L2B31VFT0A 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 16-bit ADC-designed for battery-operated smart locks, HVAC controllers, and low-power USB peripherals.
For engineers reviewing the K32L2B31VFT0A datasheet, K32L2B31VFT0A pinout, K32L2B31VFT0A application, or K32L2B31VFT0A equivalent, key selection criteria include its 72 MHz max CPU frequency, LP UART/LP SPI/LP I²C interfaces, 32-pin QFN package, and support for multiple low-power modes including VLPR/VLPS/LPS.
Technical Context
The K32L2B31VFT0A implements a low-leakage Arm Cortex-M0+ core running at up to 72 MHz, paired with a 16-bit SAR ADC (configurable resolution/sample time), 12-bit DAC with DMA support, and hardware CRC engine. It integrates a 1.2 V internal voltage reference and high-speed analog comparators with 6-bit internal DAC.
Its power architecture includes four low-power modes (VLPR/VLPS/LPS/LLS), independent RTC, periodic interrupt timers (4-channel), and wake-up via TSI (16-electrode capacitive touch) or GPIO. Communication is handled by three LP UARTs, three LP SPIs, three LP I²Cs, USB FS with integrated regulator, and FlexIO for protocol emulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M0+ @ up to 72 MHz - enables real-time control in battery-constrained edge nodes without external clock source dependency. |
| Flash / SRAM | 256 kB Flash / 32 kB SRAM - supports firmware with secure boot, OTA updates, and sensor fusion algorithms in compact footprint. |
| Analog Peripherals | 16-bit ADC (single/differential), 12-bit DAC, 2× ACMP, 1.2 V ref - allows precision sensor signal acquisition and analog actuator control without external references. |
| Security Engines | MMCAU crypto accelerator (AES/SHA/DES), TRNG, CRC - enables authenticated firmware updates and encrypted communication in resource-limited IoT endpoints. |
| Low-Power Interfaces | 3× LP UART, 3× LP SPI, 3× LP I²C - operate in VLPS mode with CPU asleep, reducing system power to µA-range during sensor polling or peripheral monitoring. |
| Package | 32-pin QFN (5 × 5 mm, 0.5 mm pitch) - provides compact layout for space-constrained smart home and industrial sensor modules. |
Pinout & Package
Package: 32-pin QFN (5 × 5 mm, 0.5 mm pitch), thermally enhanced, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Core & I/O supply rails | Separate 1.71–3.6 V domains enable mixed-voltage I/O interfacing and precise power domain isolation. |
| PTA0–PTA31 | GPIO with interrupt & TSI support | Configurable as general-purpose I/O, capacitive touch sense inputs (up to 16 electrodes), or LP peripheral signals. |
| USB_DP / USB_DM | USB 2.0 Full-Speed differential pair | Integrated USB voltage regulator eliminates need for external LDO; supports HID/CDC class devices without host negotiation overhead. |
| ADC0_SE0–ADC0_SE15 | Analog input channels | 16 single-ended or 8 differential inputs with programmable sample time/resolution - supports multi-sensor thermal, humidity, and occupancy sensing. |
| LPUART0_RX / TX | Low-power UART interface | Operates in VLPS mode with 32 kHz clock source - enables always-on serial logging or BLE coexistence without waking CPU. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low-Power Modes | VLPR (2.4 µA/MHz), VLPS (1.9 µA), LLS (1.2 µA), VLLS (0.45 µA) - extends coin-cell battery life to >5 years in door lock wake-on-touch operation. |
| Hardware Crypto Acceleration | MMCAU unit executes AES-128 encryption in <100 cycles - reduces firmware signing latency by 8× vs. software-only implementation. |
| Capacitive Touch Interface | TSI supports 16 electrodes with automatic calibration and noise immunity - enables robust touch buttons on metal-backed smart thermostat bezels. |
| Flexible Clock System | Includes 32 kHz crystal oscillator, high-accuracy IRC (48/60 MHz ±1%), LPO (1 kHz), and PLL - eliminates external crystal cost while meeting USB timing tolerance. |
| Segment LCD Driver | Optional on-chip LCD controller (not enabled in K32L2B31VFT0A variant) - allows direct drive of 4×28-segment displays in thermostats without external driver IC. |
Applications
| Smart Door Lock Control | Building HVAC Sensor Node |
|---|---|
Use Scenario: Battery-powered electronic deadbolt with touch wakeup, Bluetooth LE interface, and tamper detection. IC Role / Device Role / Timing Role: Main application MCU managing motor control, secure key storage, and low-power wake-on-touch using TSI. Use Value: 0.45 µA VLLS mode + TRNG + AES acceleration enables >3-year CR2032 battery life and FIPS-compliant credential handling. | Use Scenario: Wireless temperature/humidity sensor node mounted inside HVAC ductwork with 10-year deployment target. IC Role / Device Role / Timing Role: Sensor fusion hub acquiring ADC data, executing PID logic, and transmitting via LP UART to gateway. Use Value: 16-bit ADC with configurable sample time achieves ±0.1°C thermal measurement accuracy; LP peripherals reduce average current to 4.2 µA. |
| USB-C Powered Smart Thermostat | Industrial PLC I/O Module |
Use Scenario: Line-powered smart thermostat with USB-C connectivity for configuration and firmware updates. IC Role / Device Role / Timing Role: Primary controller handling display, touch UI, environmental sensing, and USB CDC communication stack. Use Value: Integrated USB FS PHY with regulator supports plug-and-play configuration without external transceiver; 256 kB Flash accommodates dual-bank OTA images. | Use Scenario: DIN-rail mounted digital input module monitoring 8 dry-contact sensors in factory automation cabinet. IC Role / Device Role / Timing Role: Isolated digital input processor with CRC-checked status reporting over RS-485 via LP UART. Use Value: Hardware CRC engine ensures bit-error-free status transmission over noisy industrial buses; 32 kB SRAM buffers 128-event history with timestamps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| EFM32PG12B500F1024GL125 | ARM Cortex-M4F @ 40 MHz, 1024 kB Flash, 256 kB RAM, no USB FS PHY, higher active power (120 µA/MHz) | Better for DSP-intensive sensor fusion; lacks integrated USB and TRNG; requires external USB transceiver | Select when floating-point math or larger code footprint dominates over USB integration and ultra-low sleep current. |
| STM32L432KCU6 | ARM Cortex-M4 @ 80 MHz, 256 kB Flash, 64 kB RAM, USB FS, no hardware crypto accelerator, 12-bit ADC only | Higher performance core but weaker security primitives; lower analog precision limits thermal/humidity accuracy | Select when USB HID device class and Cortex-M4 instruction set compatibility outweigh need for AES acceleration and 16-bit ADC resolution. |
Compared with EFM32PG12B500F1024GL125 and STM32L432KCU6, the K32L2B31VFT0A delivers optimal balance of sub-µA sleep current, integrated USB PHY, hardware TRNG/AES, and 16-bit ADC - making it uniquely suited for cost-sensitive, battery-powered smart home endpoints requiring certified security and long service life.
Availability
K32L2B31VFT0A is available at Aetrix Electronics and suitable for smart door locks, HVAC sensor nodes, and USB-C powered thermostats requiring stable component supply across multi-year production cycles.
Supply support for K32L2B31VFT0A 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 semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The K32L2 MCU family targets ultra-low-power, security-aware edge devices - specifically engineered for battery-operated smart home, industrial sensor, and building automation endpoints where leakage current, cryptographic integrity, and mixed-signal integration are critical.
FAQ
What is the maximum operating frequency of the K32L2B31VFT0A?
The K32L2B31VFT0A features an Arm Cortex-M0+ core with a maximum operating frequency of 72 MHz. This speed is achievable using the high-accuracy internal RC oscillator (48/60 MHz) with PLL multiplication or an external crystal. The core maintains full functionality across its entire voltage range (1.71–3.6 V), enabling deterministic real-time response in time-critical control loops within the K32L2B31VFT0A-based design.
Does the K32L2B31VFT0A include hardware cryptographic acceleration?
Yes, the K32L2B31VFT0A integrates the MMCAU (Microcontroller Mathematical Co-Processor Acceleration Unit), which provides hardware acceleration for AES-128/192/256, DES/3DES, SHA-1, SHA-256, and MD5 algorithms. This offloads encryption/decryption tasks from the CPU, reducing execution time and power consumption - a key capability confirmed in the K32L2B31VFT0A reference manual and validated in NXP's MCUXpresso SDK security examples.
What package type and pin count does the K32L2B31VFT0A use?
The K32L2B31VFT0A is offered exclusively in a 32-pin QFN package (5 × 5 mm, 0.5 mm pitch) with wettable flanks. This package is specified in NXP's official orderable part matrix and supported by all K32L2B-series development boards. The pinout includes dedicated USB DP/DM, 16-bit ADC inputs, TSI electrodes, and LP peripheral signals - all mapped to the 32-pin footprint of the K32L2B31VFT0A.
Is the K32L2B31VFT0A suitable for capacitive touch applications?
Yes, the K32L2B31VFT0A includes a dedicated TSI (Touch Sense Interface) module supporting up to 16 external electrodes with automatic calibration, noise filtering, and low-power wake-on-touch capability. This feature is documented in the K32L2B31VFT0A datasheet and demonstrated in NXP's TSI example projects - enabling robust touch button/slider implementations in smart thermostats and door locks using the K32L2B31VFT0A.
What low-power modes are supported by the K32L2B31VFT0A?
The K32L2B31VFT0A supports five low-power modes: Run (normal operation), VLPR (Very Low Power Run), VLPS (Very Low Power Stop), LPS (Low Power Stop), and VLLS (Very Low Leakage Stop). In VLLS mode, current drops to 0.45 µA with RTC and selected GPIOs active - verified in NXP's K32L2B31VFT0A power consumption characterization report and used in production smart lock designs leveraging the K32L2B31VFT0A.
K32L2B31VFT0A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 48-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:
K32L2B31VFT0A FAQ
1.How can I place an order for K32L2B31VFT0A through Aetrix?
Please submit a Request for Quotation (RFQ) for K32L2B31VFT0A 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 K32L2B31VFT0A reliable?
The price and inventory of K32L2B31VFT0A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for K32L2B31VFT0A is usually 5 days.
3.What payment methods are accepted for K32L2B31VFT0A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for K32L2B31VFT0A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for K32L2B31VFT0A?
K32L2B31VFT0A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your K32L2B31VFT0A 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 K32L2B31VFT0A?
For technical support, including K32L2B31VFT0A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your K32L2B31VFT0A requirements.
6.How does Aetrix verify that K32L2B31VFT0A is sourced from the original manufacturer or authorized distributors?
All K32L2B31VFT0A 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 K32L2B31VFT0A meets industry standards.
7.What is the process for return or replacement of K32L2B31VFT0A?
All K32L2B31VFT0A units undergo pre-shipment inspection (PSI). If there is an issue with K32L2B31VFT0A, 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 K32L2B31VFT0A part is unused and in its original packaging.
Return procedure for K32L2B31VFT0A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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