NXP Semiconductors LPC1112FD20/102,52

Overview

LPC1112FD20/102 from NXP Semiconductors is a 32-bit ARM Cortex-M0 microcontroller in SO20 package, delivering up to 50 MHz CPU operation, 16 kB flash, 4 kB SRAM, and integrated UART, I²C, SPI, 10-bit ADC, and four timers - used in cost-sensitive embedded control for lighting and alarm systems.

For engineers reviewing the LPC1112FD20/102 datasheet, LPC1112FD20/102 pinout, LPC1112FD20/102 application, or LPC1112FD20/102 equivalent, key selection criteria include its SO20 footprint, 16 GPIO pins, LPC1100L-series power profiles, windowed watchdog timer, and absence of Fast-mode Plus I²C support.

Technical Context

The LPC1112FD20/102 implements the ARM Cortex-M0 core with NVIC and Serial Wire Debug, operating at up to 50 MHz using internal RC (1 % trimmed) or external crystal (1–25 MHz) clock sources. Its PLL enables full-speed operation without high-frequency crystals.

It integrates a programmable windowed watchdog timer (WDT), Power Management Unit (PMU) supporting Sleep/Deep-sleep/Deep power-down modes, and boot ROM-resident power profiles - all specific to the LPC1100L series variant denoted by the /102 suffix.

Key Specifications

Pinout & Package

Package: SO20 - plastic small outline package, 20 leads, 7.5 mm body width (SOT163-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC1111FDH20/002, the LPC1112FD20/102 provides double flash/SRAM for enhanced firmware resilience; versus LPC1112FDH20/102, it offers identical functionality in a wider SO20 package enabling easier hand-soldering and probe access.

Availability

LPC1112FD20/102 is available at Aetrix Electronics and suitable for smart lighting control, home security panels, and industrial sensor nodes requiring stable component supply across production lifecycles.

Supply support for LPC1112FD20/102 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 markets.

The LPC111x family targets cost-optimized 32-bit replacement of 8/16-bit MCUs, emphasizing low power, simple toolchain adoption, and rapid time-to-market for resource-constrained embedded systems.

FAQ

What is the maximum operating frequency of the LPC1112FD20/102?

The LPC1112FD20/102 operates at a maximum CPU frequency of 50 MHz. This speed is achievable using either the internal 12 MHz RC oscillator (trimmed to ±1 %) with PLL multiplication or an external crystal oscillator (1–25 MHz range). The PLL allows full-speed operation without requiring a high-frequency crystal, simplifying board design while maintaining timing precision for real-time control tasks in the LPC1112FD20/102.

Does the LPC1112FD20/102 support Fast-mode Plus I²C?

No, the LPC1112FD20/102 does not support Fast-mode Plus I²C. As explicitly noted in Section 2 of the datasheet, Fast-mode Plus capability is excluded from this variant. It supports standard I²C up to 400 kHz, with SCL and SDA pins (Pins 6 and 7) compliant with full I²C-bus specification but lacking the 1 Mbit/s Fast-mode Plus data rate. This limitation applies specifically to the LPC1112FD20/102 and other SO20/TSSOP20 variants in the LPC1100L series.

How many ADC channels are available on the LPC1112FD20/102?

The LPC1112FD20/102 provides five 10-bit ADC input channels (AD[4:0]), mapped to pins PIO1_0 through PIO1_4 and R/PIO0_11. This count aligns with the SO20 package's pin count and is confirmed in Table 2 of the datasheet. The ADC supports single-ended conversion only and lacks differential mode or hardware averaging - features reserved for larger-package variants like LQFP48. All five channels are accessible without multiplexer configuration overhead in basic use cases.

What power-saving modes does the LPC1112FD20/102 support?

The LPC1112FD20/102 supports three reduced-power modes: Sleep, Deep-sleep, and Deep power-down. Sleep mode halts the CPU while peripherals remain active; Deep-sleep disables the main oscillator and retains RAM content; Deep power-down shuts down nearly all circuitry, retaining only wake-up logic and drawing less than 1 μA. These modes are managed by the integrated PMU and activated via CMSIS-compliant APIs - a core feature of the LPC1100L series denoted by the /102 suffix in LPC1112FD20/102.

Is the LPC1112FD20/102 pin-compatible with other LPC111x SO20 variants?

Yes, the LPC1112FD20/102 is pin-compatible with other SO20-packaged LPC111x devices including LPC1110FD20 and LPC1111FDH20/002. All share identical pin numbering, electrical characteristics, and functional assignment per pin position in the SO20 (SOT163-1) package. However, peripheral enablement (e.g., second SPI, Fast-mode Plus I²C) and memory sizes differ - meaning hardware layout is interchangeable, but firmware must match the specific variant's capabilities defined for LPC1112FD20/102.