NXP Semiconductors LPC1112FDH20/102:5

Overview

LPC1112FDH20/102 from NXP Semiconductors is a 32-bit ARM Cortex-M0 microcontroller in TSSOP20 package, delivering up to 50 MHz CPU operation, 16 kB flash, 4 kB SRAM, and a UART interface - designed for cost-sensitive embedded control in lighting and alarm systems.

For engineers reviewing the LPC1112FDH20/102 datasheet, LPC1112FDH20/102 pinout, LPC1112FDH20/102 application, or LPC1112FDH20/102 equivalent, key selection criteria include its 20-pin TSSOP footprint, lack of I²C Fast-mode Plus support, 5-channel 10-bit ADC, and LPC1100L-series power profile features including windowed watchdog timer and configurable open-drain GPIO.

Technical Context

The LPC1112FDH20/102 implements an ARM Cortex-M0 core with NVIC and Serial Wire Debug, operating at up to 50 MHz using internal RC (12 MHz ±1 %) or external crystal (1–25 MHz) clock sources. Its system architecture includes AHB-to-APB bridge, integrated PMU for Sleep/Deep-sleep/Deep power-down modes, and boot ROM-resident power profiles.

Peripheral integration includes one UART with RS-485 support and fractional baud rate generation, one SPI controller with FIFO, four general-purpose timers (two 16-bit, two 32-bit), and a 10-bit ADC with multiplexing across five input channels - all mapped to 14 GPIO pins in the TSSOP20 package.

Key Specifications

Pinout & Package

TSSOP20 package: plastic thin shrink small outline, 20 leads, 4.4 mm body width, 0.65 mm pitch, thermal pad optional.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC1111FDH20/002, the LPC1112FDH20/102 provides double flash and SRAM for complex state machines or protocol stacks; versus LPC1112FD20/102, it trades SO20's mechanical robustness for TSSOP20's 30 % smaller PCB footprint and finer pitch routing.

Availability

LPC1112FDH20/102 is available at Aetrix Electronics and suitable for smart lighting control, home security panels, industrial temperature monitors, and white goods motor interfaces requiring stable component supply across production lifecycles.

Supply support for LPC1112FDH20/102 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The LPC111x series targets cost-constrained 8/16-bit MCU replacement scenarios, emphasizing low power, simple toolchain adoption, and minimal code size while delivering 32-bit performance and ARM ecosystem compatibility.

FAQ

What is the maximum operating frequency of the LPC1112FDH20/102?

The LPC1112FDH20/102 operates at a maximum CPU frequency of 50 MHz. This is achieved using either the internal 12 MHz ±1 % RC oscillator (with PLL multiplication) or an external crystal oscillator ranging from 1 MHz to 25 MHz. The 50 MHz clock enables deterministic execution of real-time control algorithms with sub-100 ns instruction timing, making the LPC1112FDH20/102 suitable for time-critical embedded applications such as motor control and sensor fusion.

Does the LPC1112FDH20/102 support I²C Fast-mode Plus?

No, the LPC1112FDH20/102 does not support I²C Fast-mode Plus. As explicitly noted in the datasheet block diagram footnote "(2) Not on LPC1112FDH20/102", this variant lacks the 1 Mbit/s Fast-mode Plus capability present in higher-pin-count LPC111x packages. It supports standard I²C-bus operation at up to 400 kbit/s with multi-address recognition and monitor mode, sufficient for interfacing with common sensors and EEPROMs in lighting and alarm systems.

How many ADC input channels are available on the LPC1112FDH20/102?

The LPC1112FDH20/102 provides five ADC input channels (AD0–AD4), corresponding to pins PIO0_11, PIO1_0, PIO1_1, PIO1_2, and PIO1_3. These channels feed a single 10-bit successive-approximation ADC with internal reference, supporting sample rates up to 400 kS/s. The five-channel limitation reflects the TSSOP20 package's pin count constraints, as larger packages (e.g., LQFP48) offer up to eight ADC inputs.

What power-saving modes does the LPC1112FDH20/102 support?

The LPC1112FDH20/102 supports three reduced-power modes: Sleep, Deep-sleep, and Deep power-down. In Deep-sleep mode, current consumption drops below 10 µA while retaining SRAM and register contents, and the device can wake via up to 13 functional pins. Power profiles stored in boot ROM allow application-level optimization of these modes via a single function call, a feature exclusive to the LPC1100L and LPC1100XL series to which the LPC1112FDH20/102 belongs.

Is the LPC1112FDH20/102 pin-compatible with other LPC111x variants in TSSOP20 package?

Yes, the LPC1112FDH20/102 shares identical pinout and electrical characteristics with other TSSOP20-packaged LPC111x devices, including LPC1111FDH20/002 and LPC1112FDH20/102's sibling LPC1112FDH28/102 (though the latter is TSSOP28). This allows direct substitution within the same package family for memory or peripheral scaling, provided firmware accommodates differences in flash size, SRAM, and peripheral enablement - for example, LPC1111FDH20/002 has half the flash and SRAM but identical GPIO mapping and timer resources.