NXP Semiconductors LPC1111FHN33/103,5

Overview

LPC1111FHN33/103 from NXP Semiconductors is an ARM Cortex-M0 32-bit microcontroller in a 33-terminal HVQFN package, delivering up to 50 MHz CPU operation, 8 kB flash, 2 kB SRAM, and integrated peripherals including UART, I²C-Fast+, dual SPI, 10-bit ADC (8-channel), and four timers - designed for compact, low-power embedded control in lighting and alarm systems.

For engineers reviewing the LPC1111FHN33/103 datasheet, LPC1111FHN33/103 pinout, LPC1111FHN33/103 application, or LPC1111FHN33/103 equivalent, key selection considerations include its LPC1100XL series power profiles, windowed watchdog timer, configurable open-drain GPIO, and 28 GPIO pins in a thermally enhanced 7×7 mm HVQFN33 footprint.

Technical Context

The LPC1111FHN33/103 implements the ARM Cortex-M0 core with NVIC and Serial Wire Debug, operating at up to 50 MHz via internal 12 MHz RC oscillator (±1 %) or external crystal (1–25 MHz), supported by a PLL for full-speed execution without high-frequency crystals. It integrates a programmable windowed watchdog timer and boot ROM-resident power profiles for runtime performance/power optimization.

Peripherals include one UART with RS-485 support and fractional baud rate generation, one I²C-bus interface compliant with Fast-mode Plus (1 Mbit/s), two SPI controllers with FIFO and multi-protocol capability, four general-purpose timers (two 32-bit, two 16-bit), and a 10-bit ADC with multiplexed inputs across eight pins - all accessible on the HVQFN33 package's 28 GPIO terminals.

Key Specifications

Pinout & Package

HVQFN33 package: plastic thermal enhanced very thin quad flat package, no leads, 33 terminals, body size 7 × 7 × 0.85 mm. Pin 33 is VSS (ground); pins 1–32 are functional I/O, power, clock, and debug terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC1111FHN33/103, LPC1112FHN33/103 offers more flash for feature-rich firmware while retaining identical power/peripheral behavior; LPC1111FHN33/203 trades no flash increase for doubled SRAM - optimizing for data throughput over code size in sensor aggregation nodes.

Availability

LPC1111FHN33/103 is available at Aetrix Electronics and suitable for lighting control, alarm system nodes, eMetering interfaces, and white goods subsystems requiring stable component supply across production lifecycles.

Supply support for LPC1111FHN33/103 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 focused on secure connectivity solutions for automotive, industrial, and IoT applications.

The LPC111x family targets cost-sensitive 32-bit embedded control, bridging the gap between 8/16-bit MCUs and higher-end Cortex-M3/M4 devices - emphasizing low power, small footprint, and simplified toolchain adoption.

FAQ

What is the maximum operating frequency of the LPC1111FHN33/103?

The LPC1111FHN33/103 operates at a maximum CPU frequency of 50 MHz. This is achieved using either the internal 12 MHz RC oscillator (trimmed to ±1 % accuracy) or an external crystal (1–25 MHz) with an integrated PLL. The 50 MHz clock enables deterministic real-time response for control loops and communication stacks in resource-constrained applications.

Does the LPC1111FHN33/103 support I²C Fast-mode Plus?

Yes, the LPC1111FHN33/103 supports I²C Fast-mode Plus with a data rate of 1 Mbit/s. This capability is confirmed for the LPC1100XL series, to which LPC1111FHN33/103 belongs. The I²C interface includes multiple address recognition and monitor mode, making it suitable for multi-master sensor networks and industrial diagnostics.

How many GPIO pins are available on the LPC1111FHN33/103 in the HVQFN33 package?

The LPC1111FHN33/103 provides 28 GPIO pins in the HVQFN33 package. These include configurable pull-up/pull-down resistors, edge- and level-sensitive interrupt capability, and - specific to the LPC1100XL series - configurable open-drain mode for direct bus interfacing without external components.

What type of ADC does the LPC1111FHN33/103 integrate?

The LPC1111FHN33/103 integrates a 10-bit successive approximation ADC with input multiplexing across up to 8 pins. This ADC supports single-ended conversions and is mapped to dedicated analog input pins on the HVQFN33 package, enabling simultaneous monitoring of multiple analog sensors in lighting, metering, and appliance applications.

Is the LPC1111FHN33/103 compatible with SWD debugging?

Yes, the LPC1111FHN33/103 supports Serial Wire Debug (SWD) via dedicated SWDIO and SWCLK pins. These pins are shared with GPIO functions (SWDIO/PIO1_3 and SWCLK/PIO0_10), allowing in-circuit programming and real-time debugging without requiring JTAG headers - reducing PCB complexity and cost.