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NXP Semiconductors K32L2A31VLH1A
- Part No.:
- K32L2A31VLH1A
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
K32L2A31VLH1A.pdf
- Description:
- K32 L2A 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,649
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Product details
Overview
K32L2A31VLH1A from NXP Semiconductors is a single-core Arm® Cortex-M0+ microcontroller operating at up to 72 MHz (Normal mode) and 96 MHz (HSRUN mode), featuring 256 KB flash, 128 KB SRAM, crystal-less USB FS 2.0 device operation, LPI2C/LPSPI/LPUART interfaces, and hardware crypto acceleration (AES/DES/3DES/MD5/SHA/TRNG). It targets ultra-low-power edge sensor hub and IoT endpoint applications requiring secure, battery-operated connectivity.
For engineers reviewing the K32L2A31VLH1A datasheet, K32L2A31VLH1A pinout, K32L2A31VLH1A application, or K32L2A31VLH1A equivalent, key selection criteria include its 64-pin LQFP package, 1.71–3.6 V supply range, –40 to 105 °C industrial temperature grade, integrated USB FS OTG controller, and low-power peripheral architecture supporting VLPS/VLLS stop modes with retained SRAM and wake-up via LPI2C/LPUART/TSI/RTC.
Technical Context
The K32L2A31VLH1A implements an Arm Cortex-M0+ core with NVIC supporting 32 interrupt vectors and AWIC for asynchronous wake-up from Stop modes. Its clock system integrates FIRC (48–60 MHz), SIRC (2/8 MHz), LPO (1 kHz), and optional crystal oscillator, with PCC enabling independent peripheral clock gating and division.
Peripherals include three LPI2C modules (up to 5 Mbit/s), three LPSPI modules, three LPUARTs, FlexIO for UART/SPI/camera/parallel bus emulation, 16-bit 24-channel SAR ADC, dual analog comparators with 6-bit DACs, 12-bit DAC, and USB FS OTG controller capable of host or device operation without external crystal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+, up to 72 MHz (Normal), 96 MHz (HSRUN) - enables real-time sensor fusion and protocol stack execution in constrained power budgets. |
| Memory | 256 KB flash / 128 KB SRAM - supports full Bluetooth LE or Thread stack plus application logic with data buffering. |
| USB Interface | Crystal-less USB FS 2.0 device + OTG controller - eliminates external 12 MHz crystal, reducing BOM cost and PCB area for plug-and-play connectivity. |
| Low-Power Peripherals | LPI2C (5 Mbit/s), LPSPI, LPUART, TSI, LPIT, LPTMR - retain functionality in VLPS/VLLS modes with sub-μA wake-up current and fast resume. |
| Crypto Acceleration | CAU with AES/DES/3DES/MD5/SHA-1/SHA-256 + TRNG - offloads encryption for secure OTA updates and TLS handshake without CPU overhead. |
| Operating Range | 1.71–3.6 V supply, –40 to 105 °C - suitable for industrial-grade battery-powered gateways and smart meter concentrators. |
| Analog | 16-bit 24-channel SAR ADC, 12-bit DAC, dual CMP with 6-bit DAC - enables high-precision sensor signal acquisition and actuator control in single-chip designs. |
Pinout & Package
64-pin LQFP package, 10 × 10 mm body, 0.5 mm pitch, thermally enhanced with exposed pad (package drawing 98ASS23234W1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual 3.3 V domains (VDDA/VDDD) with separate analog/digital ground pins ensure noise isolation for ADC/DAC operation. |
| USB_DP, USB_DM | USB differential data lines | Integrated USB transceiver with internal termination and voltage regulator - no external PHY or crystal required for device-mode operation. |
| PTA0–PTA31, PTB0–PTB16, PTC0–PTC15, PTD0–PTD15, PTE0–PTE15 | GPIO with multiplexed peripheral functions | Up to 97 general-purpose I/O pins with configurable pull-up/down, slew rate, and drive strength - supports flexible interface mapping for sensor, display, or communication expansion. |
| ADC0_SE0–ADC0_SE23 | Analog input channels | 24 dedicated SAR ADC inputs with programmable gain and internal reference - enables simultaneous multi-sensor monitoring (e.g., temperature, humidity, gas). |
| LPUART0_RX/TX, LPI2C0_SDA/SCL, LPSPI0_PCS0/SCK/SDO/SDI | Low-power serial interface signals | Hardware-peripheral pins with autonomous DMA-triggered operation - allows CPU sleep during data transfer, minimizing active power. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less USB FS 2.0 | Eliminates external 12 MHz crystal and associated load capacitors, reducing component count and board space by ≥3 parts in USB-enabled endpoints. |
| Ultra-low-power stop modes (VLPS/VLLS) | Sub-1 μA typical current draw with SRAM retention and wake-up via LPI2C/LPUART/TSI/RTC - extends battery life to years in intermittent-sensing applications. |
| FlexIO module | Configurable logic engine supporting UART, SPI, camera interface, and 8080/68K parallel bus - replaces external glue logic or FPGA for custom sensor or display interfacing. |
| Hardware crypto acceleration (CAU) | Offloads AES-128/256, SHA-256, and TRNG generation from CPU - reduces encryption latency by >10× and lowers active power during secure communications. |
| 16-bit 24-channel SAR ADC | 16-bit resolution with internal 1.2 V/2.1 V references and 24 input channels - delivers ±1 LSB INL for precision environmental sensing without external signal conditioning. |
Applications
| Smart Energy Metering | Sensor Hub for Wearables |
|---|---|
Use Scenario: Sub-metering node aggregating current, voltage, and power quality data from multiple phases in residential/commercial energy monitors. IC Role / Device Role / Timing Role: Main application processor executing metrology algorithms, managing secure Zigbee/Thread wireless stack, and logging data to internal flash. Use Value: 128 KB SRAM buffers raw ADC samples across 24 channels; crystal-less USB enables field firmware updates via standard PC without custom programming hardware. | Use Scenario: Compact wearable hub collecting accelerometer, gyroscope, ECG, and SpO₂ data with local preprocessing before BLE transmission. IC Role / Device Role / Timing Role: Central sensor fusion MCU with TSI for touch UI, LPUART for debug, and LPI2C for multi-sensor synchronization. Use Value: VLPS mode draws <0.8 μA while maintaining RTC alarm and LPI2C slave readiness - enables multi-week battery life on coin cell with periodic wake-up. |
| Industrial IoT Edge Gateway | Secure Smart Home Controller |
Use Scenario: Battery- or energy-harvesting powered gateway connecting Modbus RTU field devices to cloud via LoRaWAN or NB-IoT. IC Role / Device Role / Timing Role: Protocol translator and security enforcer, running lightweight TLS and certificate validation using CAU-accelerated crypto. Use Value: 256 KB flash stores dual firmware images for A/B OTA updates; TRNG seeds secure key generation for device identity provisioning. | Use Scenario: Hub coordinating Z-Wave, Matter-over-Thread, and BLE devices with local voice assistant processing and encrypted cloud sync. IC Role / Device Role / Timing Role: Secure root-of-trust MCU managing secure boot, encrypted storage, and USB-C DFU for certified firmware updates. Use Value: Integrated USB FS OTG supports both device (for PC configuration) and host (for USB dongle-based Z-Wave radio) - simplifies certification and reduces external IC count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| K32L2A41VLH1A | 512 KB flash (vs. 256 KB), same 128 KB SRAM, identical peripherals and package - higher code storage for complex stacks or dual-image OTA. | Preferred for applications requiring larger firmware footprint (e.g., Matter SDK + BLE + Thread stacks simultaneously). | Select when flash headroom is critical; pin-compatible and drop-in replacement with no layout change. |
| KL27Z128VLH4 | ARM Cortex-M0+, 48 MHz max, 128 KB flash, 16 KB SRAM, no USB OTG, no crystal-less USB, no CAU - legacy Kinetis L-series part. | Limited to basic sensor nodes without secure connectivity or USB interface requirements. | Consider only for cost-sensitive, non-secure, low-compute applications where USB and crypto are unnecessary. |
Compared with K32L2A41VLH1A, the K32L2A31VLH1A trades flash capacity for lower unit cost while retaining identical low-power performance, USB flexibility, and security features; KL27Z128VLH4 lacks crystal-less USB, crypto acceleration, and sufficient RAM for modern IoT stacks, making it unsuitable as a functional upgrade path.
Availability
K32L2A31VLH1A is available at Aetrix Electronics and suitable for smart energy metering, industrial IoT edge gateways, and secure smart home controllers requiring stable component supply across extended product lifecycles.
Supply support for K32L2A31VLH1A 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 leader specializing in secure connectivity solutions for automotive, industrial, and IoT markets, with deep expertise in Arm-based microcontrollers and edge AI acceleration.
The K32L2Ax family is designed for ultra-low-power, secure edge intelligence - integrating crystal-less USB, hardware crypto, and advanced low-power peripherals to enable battery-operated sensor hubs, smart meters, and industrial concentrators without compromising security or connectivity.
FAQ
Does the K32L2A31VLH1A support crystal-less USB operation in both device and host modes?
Yes, the K32L2A31VLH1A supports crystal-less USB FS 2.0 device operation without external crystal. Its USB FS OTG controller also supports host mode, but host operation requires an external 12 MHz crystal or clock source per NXP documentation - only device mode is crystal-less. This makes K32L2A31VLH1A ideal for USB-peripheral applications like firmware update dongles or HID devices where external crystal elimination reduces cost and complexity.
What is the maximum SRAM retention capability during ultra-low-power stop modes on the K32L2A31VLH1A?
The K32L2A31VLH1A retains full 128 KB SRAM content in VLPS (Very Low-Power Stop) mode and all VLLS (Very Low-Leakage Stop) modes. In VLLS2 and VLLS1, 64 KB of SRAM_U remains powered; in VLLS3, both SRAM_U and SRAM_L are retained. This enables rapid wake-up with context preserved - critical for applications like sensor hubs that must resume data acquisition within microseconds after interrupt.
How does the cryptographic acceleration unit (CAU) in the K32L2A31VLH1A improve secure boot and OTA update performance?
The CAU in the K32L2A31VLH1A accelerates AES-128/256 decryption, SHA-256 hashing, and TRNG generation in hardware, reducing CPU cycles required for secure boot signature verification and OTA firmware image validation by >90%. This allows K32L2A31VLH1A to complete authenticated boot in under 15 ms and verify 64 KB encrypted firmware images in <200 ms - enabling fast, deterministic startup and robust field update resilience without impacting real-time application latency.
Can the FlexIO module on the K32L2A31VLH1A emulate a MIPI I3C interface for next-generation sensors?
No, the FlexIO module on the K32L2A31VLH1A supports UART, SPI, I²C, camera parallel interface, and Motorola 68K/Intel 8080 bus emulation per the official K32L2Ax Reference Manual, but does not implement MIPI I3C protocol timing or command structures. For I3C sensor integration, external bridge IC or software bit-banging (with significant CPU overhead) would be required - the K32L2A31VLH1A is optimized for legacy and widely deployed interfaces rather than emerging standards like I3C.
What debug interface options are supported by the K32L2A31VLH1A, and is SWD compatible with standard J-Link probes?
The K32L2A31VLH1A supports Serial Wire Debug (SWD) via dedicated SWDIO and SWCLK pins, fully compliant with ARM CoreSight specification. It is natively compatible with SEGGER J-Link, NXP LPC-Link2, and other CMSIS-DAP-compliant debug probes. The microcontroller also includes Micro Trace Buffer (MTB) for instruction trace and supports SWO for printf-style debugging - enabling full visibility into real-time execution flow without halting the core during development of low-power sensor applications.
K32L2A31VLH1A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 64-LQFP
- Series:
- K32 L2A
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- -
- Core Processor:
- ARM® Cortex®-M0+
- Core Size:
- 32-Bit
- Speed:
- 72MHz
- Connectivity:
- FlexIO, I2C, SPI, TSI, UART/USART, USB
- Peripherals:
- DMA, LCD, PWM, WDT
- Number of I/O:
- 50
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 128K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
K32L2A31VLH1A FAQ
1.How can I place an order for K32L2A31VLH1A through Aetrix?
Please submit a Request for Quotation (RFQ) for K32L2A31VLH1A 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 K32L2A31VLH1A reliable?
The price and inventory of K32L2A31VLH1A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for K32L2A31VLH1A is usually 5 days.
3.What payment methods are accepted for K32L2A31VLH1A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for K32L2A31VLH1A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for K32L2A31VLH1A?
K32L2A31VLH1A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your K32L2A31VLH1A 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 K32L2A31VLH1A?
For technical support, including K32L2A31VLH1A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your K32L2A31VLH1A requirements.
6.How does Aetrix verify that K32L2A31VLH1A is sourced from the original manufacturer or authorized distributors?
All K32L2A31VLH1A 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 K32L2A31VLH1A meets industry standards.
7.What is the process for return or replacement of K32L2A31VLH1A?
All K32L2A31VLH1A units undergo pre-shipment inspection (PSI). If there is an issue with K32L2A31VLH1A, 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 K32L2A31VLH1A part is unused and in its original packaging.
Return procedure for K32L2A31VLH1A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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