NXP Semiconductors K32L2A31VLL1A

Overview

K32L2A31VLL1A 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, and hardware crypto acceleration (AES/DES/3DES/MD5/SHA/TRNG). It targets ultra-low-power sensor hub and IoT edge node applications requiring secure, high-integration connectivity.

For engineers reviewing the K32L2A31VLL1A datasheet, K32L2A31VLL1A pinout, K32L2A31VLL1A application, or K32L2A31VLL1A equivalent, key selection criteria include its 100-pin LQFP package, 1.71–3.6 V supply range, –40 to 105 °C industrial temperature grade, integrated FlexIO for protocol emulation, and LPI2C/LPSPI/LPUART peripherals with asynchronous DMA support.

Technical Context

The K32L2A31VLL1A integrates an Arm Cortex-M0+ core with nested vector interrupt controller (NVIC) supporting 32 interrupt vectors and interrupt multiplexer (INTMUX) for peripheral prioritization. Its system clock generator (SCG) provides four sources-FIRC (48–60 MHz), SIRC (2/8 MHz), SOSC (32–40 kHz or 3–32 MHz), and PLL-with configurable dividers for core, bus, and peripheral clocks.

Power management leverages System Mode Controller (SMC) with seven low-power modes including VLPR, VLPS, and VLLS variants, enabling dynamic trade-offs between wake-up latency and static current. Peripheral clock control (PCC) supports asynchronous clocking and independent gating per module, while the low-leakage wakeup unit (LLWU) and asynchronous wake-up interrupt controller (AWIC) enable selective peripheral retention during Stop modes.

Key Specifications

Pinout & Package

Package: 100-pin LQFP, 14 × 14 mm body, 0.5 mm pitch, RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with K32L2A31VLL1A, K32L2A41VLL1A offers double flash capacity with identical low-power performance and security features, while KL27Z128VLH4 provides a legacy entry-level alternative lacking crystal-less USB and hardware crypto - making K32L2A31VLL1A the optimal balance of security, integration, and cost for mid-tier IoT edge nodes.

Availability

K32L2A31VLL1A is available at Aetrix Electronics and suitable for smart energy metering, industrial IoT edge nodes, wearable sensor hubs, and secure smart home gateways requiring stable component supply across multi-year production cycles.

Supply support for K32L2A31VLL1A 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 K32L2Ax series is designed specifically for ultra-low-power, secure edge intelligence applications - integrating advanced power gating, hardware crypto, and crystal-less USB to reduce system-level BOM and simplify certification for battery-powered and energy-harvesting devices.

FAQ

What is the maximum operating frequency of the K32L2A31VLL1A core?

The K32L2A31VLL1A features an Arm Cortex-M0+ core with two operational frequency modes: up to 72 MHz in Normal Run mode and up to 96 MHz in High Speed Run (HSRUN) mode. The HSRUN mode requires specific voltage and clock configuration per the datasheet, and is intended for short-duration compute-intensive tasks such as cryptographic operations or sensor fusion bursts. Both modes are fully supported in the K32L2A31VLL1A silicon revision.

Does the K32L2A31VLL1A support crystal-less USB operation?

Yes, the K32L2A31VLL1A supports crystal-less USB FS 2.0 device operation using its internal 48 MHz fast internal reference clock (FIRC) with precision trimming. This eliminates the need for an external 48 MHz crystal or oscillator, reducing bill-of-materials cost and PCB footprint. The USB FS OTG controller also supports host mode, but crystal-less operation applies only to device mode per the K32L2A31VLL1A datasheet specifications.

What security features are integrated into the K32L2A31VLL1A?

The K32L2A31VLL1A integrates multiple hardware security features: a Cryptographic Acceleration Unit (CAU) supporting AES/DES/3DES/MD5/SHA-1/SHA-256, a True Random Number Generator (TRNG), factory-programmed 80-bit unique identification, secure debug disable via flash SEC bit, and backdoor key protection. These features are implemented in silicon and accessible through the ROM bootloader and standard peripheral registers - all confirmed in the K32L2A31VLL1A Technical Data document Rev. 3.

What is the package type and pin count of the K32L2A31VLL1A?

The K32L2A31VLL1A is packaged in a 100-pin LQFP (Low-Profile Quad Flat Package) with 14 × 14 mm body size and 0.5 mm lead pitch. This package is explicitly listed in Table 1 of the K32L2A31VLL1A ordering information and matches the 100-LQFP mechanical drawing 98ASS23308W1. It provides 97 GPIOs with multiplexed peripheral functions and dedicated power/ground pins for noise isolation.

How much SRAM and flash memory does the K32L2A31VLL1A include?

The K32L2A31VLL1A includes 128 KB of on-chip SRAM and 256 KB of program flash memory. Additionally, it contains 32 KB of ROM with a built-in bootloader. These memory sizes are specified in the "Ordering Information" table of the K32L2A31VLL1A datasheet and distinguish it from the K32L2A41VLL1A variant, which offers 512 KB flash while retaining the same 128 KB SRAM and ROM configuration.