NXP Semiconductors LPC11U24FHN33/401,

Overview

LPC11U24FHN33/401 from NXP Semiconductors is a 32-bit ARM Cortex-M0 microcontroller designed for USB-connected embedded applications, operating at up to 50 MHz with 32 kB flash, 8 kB SRAM, 4 kB EEPROM, and full-speed USB 2.0 device controller. It integrates a 10-bit ADC (8 channels), two SSP interfaces, I²C-bus Fast-mode Plus (1 Mbit/s), USART with RS-485/smart card support, and 26 GPIO pins in a 33-terminal HVQFN package - ideal for compact USB audio devices and handheld medical scanners.

For engineers reviewing the LPC11U24FHN33/401 datasheet, LPC11U24FHN33/401 pinout, LPC11U24FHN33/401 application, or LPC11U24FHN33/401 equivalent, this page delivers verified technical context, validated pin functions, real-world use cases, and confirmed alternative parts - all grounded in NXP's Rev. 2.3 datasheet and official ordering information.

Technical Context

The LPC11U24FHN33/401 implements an ARM Cortex-M0 core with NVIC and NMI support, paired with dual PLLs - one for CPU clocking (up to 50 MHz) and a dedicated PLL for USB timing compliance. Its memory subsystem includes boot ROM (16 kB), on-chip flash (32 kB), SRAM (8 kB), and byte-erasable EEPROM (4 kB), all accessible via ISP/IAP.

Digital peripherals include four counter/timers (two 32-bit, two 16-bit), programmable WWDT with internal low-power WDO, and GPIO with configurable pull-up/down, repeater, and open-drain modes. Analog capability centers on a single 10-bit ADC with multiplexed inputs across eight pins, while serial connectivity spans USB 2.0 FS, USART (with fractional baud rate, FIFO, ISO 7816-3 smart card mode), two SSPs, and I²C-bus Fast-mode Plus.

Key Specifications

Pinout & Package

Package: HVQFN33 (plastic thermal enhanced very thin quad flat package; no leads; 33 terminals; body 7 × 7 × 0.85 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC11U24FHN33/401, the LPC11U37FBD64/401 offers expanded I/O and capture capability in a larger package, while the LPC11U68JBD100E delivers significantly higher performance and protocol breadth at the cost of increased complexity and no EEPROM - making LPC11U24FHN33/401 optimal for cost-sensitive, space-constrained USB peripheral designs.

Availability

LPC11U24FHN33/401 is available at Aetrix Electronics and suitable for USB audio devices, handheld medical scanners, industrial control sensors, and consumer peripherals requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature (−40 °C to +85 °C).

Supply support for LPC11U24FHN33/401 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, IoT, and mobile applications - with over 50 years of microcontroller innovation.

The LPC11U2x product line was engineered specifically for cost-sensitive, USB-native embedded systems needing low-power operation, compact packaging, and rapid USB device deployment - emphasizing ROM-based drivers, EEPROM persistence, and Cortex-M0 efficiency.

FAQ

What is the maximum operating frequency of the LPC11U24FHN33/401?

The LPC11U24FHN33/401 operates at a maximum CPU frequency of 50 MHz, achieved using either the internal 12 MHz IRC oscillator or an external crystal (1–25 MHz) fed into the main PLL. This frequency is fully supported across its specified temperature range (−40 °C to +85 °C) and enables deterministic USB Full-Speed packet processing without external clocking components.

Does the LPC11U24FHN33/401 include on-chip EEPROM, and what is its endurance?

Yes, the LPC11U24FHN33/401 integrates 4 kB of on-chip EEPROM that is byte-erasable and byte-programmable. While the datasheet does not specify exact write/erase cycle endurance, NXP's LPC11U2x family EEPROM is qualified for ≥100,000 write/erase cycles under typical operating conditions - sufficient for storing calibration data, device IDs, or user configurations in field-deployed equipment.

How many GPIO pins are available on the LPC11U24FHN33/401 package?

The LPC11U24FHN33/401 in the HVQFN33 package provides 26 GPIO pins, as confirmed in Table 2 of the datasheet. These include multiplexed functions such as ADC inputs (AD0–AD7), timer match/capture signals, and serial interface lines - all configurable via IOCON registers. Pins like PIO0_4 and PIO0_5 default to open-drain I²C mode but remain usable as general-purpose I/O.

Is the LPC11U24FHN33/401 compatible with USB 2.0 Low-Speed mode?

No, the LPC11U24FHN33/401 implements a USB 2.0 Full-Speed device controller only (12 Mbit/s). It does not support Low-Speed mode (1.5 Mbit/s). The USB interface complies with USB 2.0 specification for Full-Speed operation, including built-in transceivers, VBUS sensing, SoftConnect, and ROM-resident USB device stack - eliminating need for external PHY or speed negotiation logic.

What power modes does the LPC11U24FHN33/401 support, and how is wake-up handled from Deep power-down?

The LPC11U24FHN33/401 supports four reduced-power modes: Sleep, Deep-sleep, Power-down, and Deep power-down. From Deep power-down, wake-up is exclusively triggered by a LOW-going pulse (≥50 ns) on the dedicated WAKEUP pin (PIO0_16), which doubles as ADC input AD5. An external pull-up is required on this pin to enter Deep power-down mode, and no other sources (GPIO, USB, watchdog) are active in this state.