NXP Semiconductors LPC1112FHN33/202,5

Overview

LPC1112FHN33/202 from NXP Semiconductors is a 32-bit ARM Cortex-M0 microcontroller in HVQFN33 package, featuring 16 kB flash, 4 kB SRAM, 28 GPIO pins, 10-bit ADC with 8 input channels, and one UART with RS-485 support - deployed in lighting control and alarm system firmware.

For engineers reviewing the LPC1112FHN33/202 datasheet, LPC1112FHN33/202 pinout, LPC1112FHN33/202 application, or LPC1112FHN33/202 equivalent, key selection criteria include power profile support (LPC1100L series), I²C Fast-mode Plus capability, windowed watchdog timer, and compatibility with SWD debug interface.

Technical Context

The LPC1112FHN33/202 implements an ARM Cortex-M0 core with Nested Vectored Interrupt Controller (NVIC) and system tick timer, operating at up to 50 MHz via internal 12 MHz RC oscillator (±1 %) or external crystal (1–25 MHz). It integrates a programmable windowed watchdog timer and supports Sleep, Deep-sleep, and Deep power-down modes via on-chip PMU.

Peripheral integration includes one Fast-mode Plus I²C-bus interface (1 Mbit/s), one UART with fractional baud rate generation and RS-485 support, two SPI controllers (SSP features), four general-purpose timers (up to 13 match outputs), and a 10-bit ADC multiplexed across eight pins - all accessible through 28 GPIOs with configurable pull-up/pull-down and open-drain mode.

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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC1112FHN33/102, the LPC1112FHN33/202 provides 2× more SRAM and factory-configured power profiles for adaptive low-power operation; compared with LPC1112FHN33/203, it omits the second SPI but retains identical memory, GPIO, and analog resources - making it optimal for cost-constrained, power-aware embedded control where SPI expansion is unnecessary.

Availability

LPC1112FHN33/202 is available at Aetrix Electronics and suitable for lighting control, alarm systems, and eMetering requiring stable component supply across industrial temperature range (−40 °C to +85 °C).

Supply support for LPC1112FHN33/202 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 LPC111x family targets cost-sensitive 32-bit embedded applications previously served by 8/16-bit MCUs, emphasizing low power, small footprint, and ARM ecosystem compatibility - especially for white goods, lighting, and security systems.

FAQ

What is the maximum CPU frequency supported by the LPC1112FHN33/202?

The LPC1112FHN33/202 supports 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 oscillator (1–25 MHz) with an integrated PLL. The PLL allows the core to run at full speed without requiring a high-frequency crystal, reducing BOM cost and layout complexity while maintaining timing precision for real-time control tasks in the LPC1112FHN33/202.

Does the LPC1112FHN33/202 support I²C Fast-mode Plus?

Yes, the LPC1112FHN33/202 supports I²C Fast-mode Plus with a data rate of 1 Mbit/s. This capability is confirmed for the LPC1100L series (to which LPC1112FHN33/202 belongs) and includes multi-address recognition and monitor mode. The I²C pins (SCL and SDA) are configured as open-drain outputs with 20 mA sink capability, enabling robust bus driving in electrically noisy environments - a key feature distinguishing the LPC1112FHN33/202 from base LPC1100-series variants.

How many ADC input channels does the LPC1112FHN33/202 provide?

The LPC1112FHN33/202 provides eight ADC input channels, supporting a 10-bit successive approximation converter. These channels are mapped to GPIO pins AD0–AD7, all accessible on the HVQFN33 package. The ADC supports single-ended conversion with programmable sampling time and trigger sources including timer match events and software commands - enabling precise analog sensing for applications like temperature monitoring and current measurement in the LPC1112FHN33/202.

What debug interface does the LPC1112FHN33/202 use?

The LPC1112FHN33/202 uses Serial Wire Debug (SWD), a two-pin ARM-standard interface (SWDIO and SWCLK). This replaces JTAG to reduce pin count and PCB routing complexity while retaining full debug functionality - including breakpoints, watchpoints, memory inspection, and real-time variable monitoring. SWD is implemented on dedicated pins (PIO1_3 and PIO0_10) that retain alternate functions (ADC, timer, SPI), allowing flexible board design without sacrificing debug access in the LPC1112FHN33/202.

Is the LPC1112FHN33/202 qualified for industrial temperature operation?

Yes, the LPC1112FHN33/202 is qualified for industrial temperature operation from −40 °C to +85 °C, indicated by the 'F' suffix in its ordering code. This rating is specified in Table 2 of the official NXP datasheet and applies to all LPC1112FHN33/xxx variants with 'F' temperature grade. The device incorporates POR, brownout detection with four threshold levels, and robust ESD protection - ensuring reliable startup and operation across thermal extremes encountered in lighting, alarm, and metering equipment using the LPC1112FHN33/202.