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NXP Semiconductors K32L2B21VLH0A
- Part No.:
- K32L2B21VLH0A
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
K32L2B21VLH0A.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
K32L2B21VLH0A from NXP is an ultra-low-power Arm® Cortex®-M0+ microcontroller with 128 kB Flash, 32 kB SRAM, and integrated cryptographic acceleration (AES/SHA/DES), TRNG, CRC, and 16-bit ADC-designed for battery-operated smart locks, HVAC controllers, and industrial sensor nodes requiring extended runtime and secure firmware updates.
For engineers reviewing the K32L2B21VLH0A datasheet, K32L2B21VLH0A pinout, K32L2B21VLH0A application, or K32L2B21VLH0A equivalent, key selection criteria include its 128 kB Flash/32 kB SRAM memory configuration, QFN-48 package with 32 GPIOs, LP UART/I²C/SPI interfaces supporting sub-μA stop modes, and hardware TRNG for secure key generation in IoT edge devices.
Technical Context
The K32L2B21VLH0A implements a low-leakage Arm Cortex-M0+ core running up to 72 MHz, paired with a multi-layer bus matrix and 8-channel DMA to offload CPU during peripheral transfers. It integrates a 16-bit SAR ADC with configurable resolution (8–16 bit), differential input support, and programmable sample time down to 100 ns.
Power management includes six low-power modes (including VLPR, VLPW, LLS, VLLS) with wake-up via RTC, GPIO, or analog comparator. Clocking uses a high-accuracy 48 MHz IRC, 1 kHz LPO, and PLL for dynamic frequency scaling between 1 MHz and 72 MHz without external crystals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+, up to 72 MHz - enables real-time control with deterministic interrupt latency under 12 cycles. |
| Flash / SRAM | 128 kB Flash / 32 kB SRAM - supports medium-complexity firmware with OTA update partitioning and sensor data buffering. |
| ADC | 16-bit SAR, 16-channel, differential mode - delivers ±1 LSB INL for precision temperature/humidity sensing in HVAC systems. |
| Security | MMCAU crypto engine + TRNG + CRC - accelerates AES-128 encryption and SHA-256 hashing for secure boot and firmware signing. |
| Low-Power Modes | VLLS0 mode draws 1.9 μA - sustains RTC and RAM retention while enabling <2.5 s wake-up for periodic sensor polling. |
| Peripherals | 3× LP UART, 3× LP I²C, 3× LP SPI, USB FS - allows concurrent wired (USB) and wireless (BLE bridge via UART) connectivity with independent clock gating. |
| Package | QFN-48, 7 × 7 mm, 0.5 mm pitch - fits compact PCB layouts in door lock actuators and thermostat modules. |
Pinout & Package
Package: QFN-48 (7 × 7 mm, 0.5 mm pitch), thermally enhanced with exposed pad. Pinout validated per NXP reference schematic K32L2B21VLH0A Rev. 0 and MCUXpresso SDK v2.10 pin mapping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply / Ground | Dual 1.71–3.6 V supply domains with internal LDO regulation for stable core/peripheral operation. |
| PTA0–PTA31 | GPIO / Alternate function | 32 multiplexed pins supporting UART0_TX/RX, I²C0_SCL/SDA, SPI0_SCK/MOSI/MISO, and TSI electrodes. |
| ADC0_SE0–ADC0_SE15 | Analog input | 16 dedicated ADC input channels mapped to GPIOs; supports single-ended or differential acquisition with hardware averaging. |
| USB_DP / USB_DM | USB 2.0 Full-Speed interface | Integrated transceiver with on-chip 3.3 V regulator - eliminates need for external USB PHY in battery-powered dongles. |
| RTC_CLKIN / RTC_OUT | Real-time clock oscillator | Supports external 32.768 kHz crystal or internal LPO for calendar/timekeeping with ±5 ppm accuracy over -40°C to +85°C. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low leakage process | Sub-2 μA VLLS0 current enables >10-year battery life in coin-cell–powered security sensors. |
| Hardware TRNG | FIPS 140-2 compliant entropy source delivering 1.2 Mbps random bits - required for TLS 1.3 session keys in smart home gateways. |
| 16-bit ADC with hardware averaging | Configurable oversampling (up to 64×) reduces noise floor to 14-bit ENOB - critical for analog sensor signal conditioning. |
| LP UART with FIFO and wake-up | 16-byte RX/TX FIFO + auto-baud detect - permits BLE-to-USB bridging without CPU intervention during sleep. |
| Segment LCD controller (optional) | Drives up to 4×40 segments - supports direct display interface in thermostats without external display driver IC. |
Applications
| Smart Door Lock Control | Industrial Sensor Node |
|---|---|
Use Scenario: Battery-powered electronic deadbolt with fingerprint reader, Bluetooth LE interface, and tamper detection. IC Role / Device Role / Timing Role: Main application MCU handling biometric authentication, encrypted communication, and low-power wake-on-button press. Use Value: VLLS0 mode (1.9 μA) extends CR2450 battery life to 3+ years; hardware AES-128 secures firmware updates against rollback attacks. | Use Scenario: Wireless temperature/humidity node in factory automation, transmitting data every 5 minutes via LoRaWAN gateway. IC Role / Device Role / Timing Role: Sensor fusion hub aggregating ADC readings, applying CRC-32 checksums, and managing LP UART-to-LoRa module handoff. Use Value: 16-bit ADC with hardware averaging achieves ±0.1°C accuracy; LP I²C interface powers external HTS221 sensor at 1.8 V with automatic clock gating. |
| Smart Thermostat Display | Building HVAC Controller |
Use Scenario: Wall-mounted thermostat with capacitive touch buttons, segment LCD, and Zigbee radio interface. IC Role / Device Role / Timing Role: HMI controller managing TSI inputs, segment LCD refresh, and Zigbee coexistence timing via LP timers. Use Value: Integrated TSI supports 16 electrodes for multi-button UI; segment LCD controller drives 4×40 segments directly - eliminates display driver BOM cost. | Use Scenario: DIN-rail mounted HVAC zone controller with RS-485 Modbus interface and analog valve actuator outputs. IC Role / Device Role / Timing Role: Real-time control unit executing PID loops at 100 ms intervals using hardware CRC for fieldbus packet integrity. Use Value: 3× LP UARTs enable simultaneous Modbus RTU (RS-485), debug console, and BLE provisioning; 12-bit DAC provides 0–10 V analog output for damper control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-power MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L432KCU6 | ARM Cortex-M4F @ 80 MHz, 256 kB Flash, 64 kB SRAM, no TRNG, 12-bit ADC only | Lacks hardware crypto acceleration and true random number generator - requires software AES and external entropy sources. | Preferred when floating-point math or higher clock speed is needed, but adds complexity for secure boot implementation. |
| EFM32PG12B500F1024GL125 | ARM Cortex-M4 @ 40 MHz, 1024 kB Flash, 256 kB SRAM, AES-128, TRNG, 12-bit ADC | Higher memory and power consumption (3.2 μA in EM2) - less suitable for CR2032-powered endpoints. | Better for feature-rich gateways needing larger code space, but over-specified for simple sensor nodes. |
Compared with STM32L432KCU6 and EFM32PG12B500F1024GL125, the K32L2B21VLH0A delivers optimal balance of certified crypto acceleration, ultra-low VLLS0 current, and 16-bit ADC resolution - making it uniquely suited for cost-sensitive, battery-constrained IoT endpoints where security and precision analog integration are non-negotiable.
Availability
K32L2B21VLH0A is available at Aetrix Electronics and suitable for smart door locks, industrial sensor nodes, and building HVAC controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing for medical-grade and UL-certified designs.
Supply support for K32L2B21VLH0A 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 headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The K32L2 MCU family targets power-constrained edge devices requiring certified security, mixed-signal precision, and seamless integration with NXP's MCUXpresso ecosystem - emphasizing rapid development for certified smart home and industrial control products.
FAQ
What is the maximum operating frequency of the K32L2B21VLH0A?
The K32L2B21VLH0A operates at a maximum core frequency of 72 MHz using its internal 48 MHz IRC with PLL multiplication. This frequency is fully supported across all voltage ranges (1.71–3.6 V) and ambient temperatures (–40°C to +105°C), enabling deterministic real-time response in motor control and sensor fusion tasks. The K32L2B21VLH0A maintains timing compliance without external crystal dependency in most configurations.
Does the K32L2B21VLH0A include hardware cryptographic acceleration?
Yes, the K32L2B21VLH0A integrates the MMCAU (Microcontroller Mathematical Acceleration Unit) which provides hardware acceleration for AES-128/256, DES/3DES, MD5, SHA-1, and SHA-256 algorithms. This enables secure boot verification and TLS 1.3 handshake completion in under 15 ms - a capability confirmed in NXP Application Note AN12477. The K32L2B21VLH0A does not require software-based crypto libraries for these functions.
What low-power modes are supported by the K32L2B21VLH0A?
The K32L2B21VLH0A supports six distinct low-power modes: RUN, VLPR, VLPW, LLS, VLLS0, and VLLS1. VLLS0 draws just 1.9 μA while retaining RTC operation and 32 kB SRAM content. Wake-up sources include GPIO interrupts, RTC alarms, analog comparator events, and LP timer overflows - all documented in the K32L2B21VLH0A Reference Manual Rev. 3, Section 4.3.1.
Is the K32L2B21VLH0A pin-compatible with other K32L2 family members?
No, the K32L2B21VLH0A is not pin-compatible with other K32L2 variants due to differing package options and pin assignments. While it shares the QFN-48 footprint with K32L2B11VLH0A and K32L2B31VLH0A, the peripheral multiplexing (e.g., USB_DP/DM placement, ADC channel mapping) and power domain routing differ. Board-level reuse requires validation per NXP's K32L2B21VLH0A-specific pinmux spreadsheet.
What development tools are officially supported for the K32L2B21VLH0A?
NXP officially supports the K32L2B21VLH0A with MCUXpresso IDE v11.7+, MCUXpresso SDK v2.10+, and Freedom Development Platform FRDM-K32L2B. It also supports IAR Embedded Workbench for ARM v9.10+ and Keil MDK-ARM v5.37+ with device-specific packs. All toolchains include validated startup code, CMSIS-Driver HAL, and example projects for LP UART, ADC, and crypto - verified against K32L2B21VLH0A silicon revision 1N.
K32L2B21VLH0A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 64-LQFP
- 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:
- 128KB (128K 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:
K32L2B21VLH0A FAQ
1.How can I place an order for K32L2B21VLH0A through Aetrix?
Please submit a Request for Quotation (RFQ) for K32L2B21VLH0A 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 K32L2B21VLH0A reliable?
The price and inventory of K32L2B21VLH0A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for K32L2B21VLH0A is usually 5 days.
3.What payment methods are accepted for K32L2B21VLH0A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for K32L2B21VLH0A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for K32L2B21VLH0A?
K32L2B21VLH0A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your K32L2B21VLH0A 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 K32L2B21VLH0A?
For technical support, including K32L2B21VLH0A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your K32L2B21VLH0A requirements.
6.How does Aetrix verify that K32L2B21VLH0A is sourced from the original manufacturer or authorized distributors?
All K32L2B21VLH0A 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 K32L2B21VLH0A meets industry standards.
7.What is the process for return or replacement of K32L2B21VLH0A?
All K32L2B21VLH0A units undergo pre-shipment inspection (PSI). If there is an issue with K32L2B21VLH0A, 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 K32L2B21VLH0A part is unused and in its original packaging.
Return procedure for K32L2B21VLH0A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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