NXP Semiconductors LPC1111FHN33/203,5

Overview

LPC1111FHN33/203 from NXP Semiconductors is an ARM Cortex-M0 32-bit microcontroller in HVQFN33 package, featuring 8 kB flash, 4 kB SRAM, 1 UART, 1 I²C-bus (Fast-mode Plus), 2 SPI interfaces, 10-bit ADC with 8 input channels, and 28 GPIO pins. It operates at up to 50 MHz and targets low-power embedded control in lighting, alarm systems, and eMetering.

For engineers reviewing the LPC1111FHN33/203 datasheet, LPC1111FHN33/203 pinout, LPC1111FHN33/203 application, or LPC1111FHN33/203 equivalent, key selection criteria include its LPC1100XL series power profiles, windowed watchdog timer, configurable open-drain GPIO, and support for RS-485 UART framing - all confirmed for this exact variant.

Technical Context

This MCU implements the ARMv6-M architecture with NVIC and Serial Wire Debug, enabling deterministic real-time interrupt handling and on-chip debug visibility. Its clock system integrates a 12 MHz ±1 % internal RC oscillator, crystal oscillator (1–25 MHz), programmable PLL, and watchdog oscillator (9.4 kHz–2.3 MHz).

The LPC1111FHN33/203 belongs to the LPC1100XL series, distinguishing it with power profiles in boot ROM, 256-byte page erase capability, and dual SPI controllers - features absent in base LPC1100 and LPC1100L variants. It supports Fast-mode Plus I²C (1 Mbit/s) and RS-485 UART with fractional baud rate generation.

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, exposed thermal pad, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC1111FHN33/203, LPC1112FHN33/203 doubles flash capacity without altering power behavior or footprint, while LPC1114FHN33/203 quadruples flash and maintains full peripheral compatibility - both retain identical GPIO count, ADC channels, and WWDT functionality for drop-in migration paths.

Availability

LPC1111FHN33/203 is available at Aetrix Electronics and suitable for lighting control, alarm systems, and eMetering requiring stable component supply across extended temperature ranges (−40 °C to +85 °C).

Supply support for LPC1111FHN33/203 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 LPC1100XL series - including LPC1111FHN33/203 - was designed for cost-sensitive, low-power embedded applications demanding robust timing, integrated analog, and industrial-grade reliability in compact packages.

FAQ

What is the maximum operating frequency of the LPC1111FHN33/203?

The LPC1111FHN33/203 operates at a maximum CPU frequency of 50 MHz. This is achieved using the on-chip PLL, which can be driven by either the internal 12 MHz RC oscillator (±1 % accuracy) or an external crystal (1–25 MHz). The core runs at full speed without requiring high-frequency external clocks, reducing system BOM cost and EMI concerns.

Does the LPC1111FHN33/203 support RS-485 communication?

Yes, the LPC1111FHN33/203 supports RS-485 communication via its UART peripheral, which includes hardware features for half-duplex bus operation: fractional baud rate generation, internal FIFO, and dedicated control signals (RTS/CTS) for driver enable management. This eliminates need for external transceivers in basic implementations.

What ADC resolution and input channel count does the LPC1111FHN33/203 provide?

The LPC1111FHN33/203 integrates a 10-bit successive approximation ADC with 8 input channels (AD[7:0]), accessible on the HVQFN33 package. Conversion is performed against the VDD reference, and the ADC supports single-shot and burst modes with programmable sampling rates up to the system clock frequency.

Is the LPC1111FHN33/203 pin-compatible with other HVQFN33 variants in the LPC111x family?

Yes, the LPC1111FHN33/203 shares identical pinout and package dimensions (7 × 7 × 0.85 mm) with all other LPC111x FHN33 variants, including LPC1112FHN33/203 and LPC1114FHN33/203. Signal mapping, power/ground pin locations, and debug interface pins are fully aligned across this package group.

What distinguishes the LPC1100XL series (e.g., LPC1111FHN33/203) from LPC1100 and LPC1100L?

The LPC1111FHN33/203 belongs to the LPC1100XL series, which adds three key features over earlier variants: power profiles in boot ROM for runtime power/performance tuning, windowed watchdog timer (WWDT) for enhanced firmware safety, and 256-byte flash page erase for efficient firmware updates - all confirmed in the official NXP datasheet Rev. 9.2.