NXP Semiconductors LPC1114FN28/102,12

Overview

LPC1114FN28/102 from NXP Semiconductors is a 32-bit ARM Cortex-M0 microcontroller in a 28-pin DIP package, delivering up to 50 MHz CPU operation, 32 kB flash, 4 kB SRAM, and integrated peripherals including UART with RS-485 support, Fast-mode Plus I²C, two SPI interfaces, four timers, and a 10-bit ADC with six input channels - deployed in lighting control and alarm system firmware.

For engineers reviewing the LPC1114FN28/102 datasheet, LPC1114FN28/102 pinout, LPC1114FN28/102 application, or LPC1114FN28/102 equivalent, key selection criteria include its DIP28 through-hole package for prototyping, LPC1100L-series power profiles for low-power operation, and verified compatibility with legacy 8/16-bit MCU replacement designs requiring UART+I²C+ADC integration.

Technical Context

The LPC1114FN28/102 implements an ARM Cortex-M0 core with Nested Vectored Interrupt Controller (NVIC) and Serial Wire Debug (SWD), supporting deterministic real-time execution at up to 50 MHz. Its clock system integrates a 12 MHz ±1 % internal RC oscillator, crystal oscillator (1–25 MHz), and programmable PLL for flexible frequency synthesis without external high-frequency crystals.

Peripheral architecture includes one UART with fractional baud rate generation and RS-485/EIA-485 support, one Fast-mode Plus I²C-bus interface (1 Mbit/s), two SPI controllers with SSP features, four general-purpose timers (two 32-bit, two 16-bit), and a 10-bit ADC with multiplexed inputs across six pins - all mapped to the 22 GPIO pins available in the DIP28 package.

Key Specifications

Pinout & Package

DIP28 (plastic dual in-line package; 28 leads, 600 mil width; SOT117-1). Pin functions validated per NXP datasheet Rev. 9.2 Table 7 and Figure 13.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC1114FDH28/102, the LPC1114FN28/102 offers identical functionality in a DIP28 package for rapid prototyping and legacy board upgrades; versus LPC1114FBD48/302, it trades I/O count and memory for compact through-hole integration in space-constrained control panels.

Availability

LPC1114FN28/102 is available at Aetrix Electronics and suitable for lighting control, alarm systems, and eMetering applications requiring stable component supply, long-term lifecycle support, and through-hole compatibility for industrial maintenance workflows.

Supply support for LPC1114FN28/102 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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The LPC111x series was designed specifically for cost-sensitive, low-power embedded applications replacing legacy 8/16-bit microcontrollers - emphasizing compact code size, simple toolchain adoption, and integrated analog/digital peripherals in small packages.

FAQ

What is the maximum operating frequency of the LPC1114FN28/102?

The LPC1114FN28/102 operates at a maximum CPU frequency of 50 MHz. This performance level is achieved using the internal PLL, which can be driven by either the 12 MHz internal RC oscillator (±1 % accuracy) or an external crystal (1–25 MHz). The 50 MHz clock enables deterministic real-time processing for time-critical tasks such as PWM generation in lighting control or fast interrupt response in alarm systems - all while maintaining compatibility with the ARM Cortex-M0 instruction cycle model.

Does the LPC1114FN28/102 support in-system programming (ISP)?

Yes, the LPC1114FN28/102 supports In-System Programming (ISP) via its built-in bootloader, accessible through UART using standard serial commands. This capability allows firmware updates without removing the device from the target board. The ISP function is fully implemented in ROM and requires no user code overhead. For development, ISP enables rapid iteration during prototyping; for production, it supports field upgrades and calibration adjustments - both essential for deployed lighting and alarm products where physical access is limited.

How many ADC input channels does the LPC1114FN28/102 provide?

The LPC1114FN28/102 provides six ADC input channels (AD0–AD5), consistent with its DIP28 package variant. These are multiplexed onto dedicated GPIO pins and support 10-bit resolution with programmable sample rate. The six-channel configuration enables simultaneous monitoring of multiple analog sources - such as temperature, light intensity, and supply voltage - within resource-constrained applications like smart thermostats or battery-powered alarm sensors. Channel selection is controlled via the ADC register interface without requiring external multiplexers.

Is the LPC1114FN28/102 pin-compatible with other LPC111x variants in DIP28?

No, the LPC1114FN28/102 is not pin-compatible with other DIP28 variants such as LPC1112FDH28/102 or LPC1114FDH28/102. While all share the same 28-pin DIP mechanical outline, their pin functions differ significantly - particularly for peripheral signals like UART, I²C, and timer outputs. For example, LPC1112FDH28/102 only supports five ADC inputs and lacks Fast-mode Plus I²C. Therefore, direct substitution requires verification of signal mapping against each device's specific pinout table (NXP Table 7) and may necessitate PCB modifications.

What power supply voltage range does the LPC1114FN28/102 support?

The LPC1114FN28/102 operates from a single supply voltage ranging from 1.8 V to 3.6 V. This wide input range accommodates both lithium coin-cell (3 V) and regulated 3.3 V or 2.5 V system rails without external level-shifting. Internal voltage regulation ensures stable core and I/O operation across the full range, enabling use in battery-backed alarm panels and energy-harvesting lighting nodes. Brownout detection with four programmable thresholds further enhances reliability by triggering interrupts or forced resets before supply collapse affects firmware integrity.