NXP Semiconductors LPC1111FDH20/002,5

Overview

LPC1111FDH20/002 from NXP Semiconductors is an ARM Cortex-M0 32-bit microcontroller in TSSOP20 package, delivering up to 50 MHz CPU operation, 8 kB flash, 2 kB SRAM, and integrated power profiles for low-power embedded control. It features one UART with RS-485 support, one I²C-bus interface (Fast-mode Plus), one SPI, a 10-bit ADC with 5-channel input, and 16 GPIO pins - deployed in lighting control and alarm systems.

For engineers reviewing the LPC1111FDH20/002 datasheet, LPC1111FDH20/002 pinout, LPC1111FDH20/002 application, or LPC1111FDH20/002 equivalent, key selection factors include its TSSOP20 footprint, LPC1100L-series power management features, 16 GPIO count, 5-channel ADC mapping, and absence of second SPI or windowed watchdog - all critical for space-constrained industrial sensor nodes and white-goods UI modules.

Technical Context

The LPC1111FDH20/002 implements the ARM Cortex-M0 core with NVIC and Serial Wire Debug, operating at up to 50 MHz using internal 12 MHz RC oscillator (±1 %) or external crystal (1–25 MHz). Its clock system includes PLL, programmable watchdog oscillator (9.4 kHz–2.3 MHz), and CLKOUT divider supporting multiple clock sources.

Power management integrates PMU with Sleep, Deep-sleep, and Deep power-down modes; the LPC1100L series adds power profiles in boot ROM for runtime performance/power trade-off tuning. Peripheral set excludes second SPI and windowed WDT - confirmed for this TSSOP20 variant per ordering table and block diagram constraints.

Key Specifications

Pinout & Package

TSSOP20 package: plastic thin shrink small outline, 20 leads, 4.4 mm body width, 0.65 mm lead pitch, exposed pad optional - optimized for automated assembly and thermal relief in compact PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC1111FDH20/002, LPC1112FDH20/102 offers double flash and SRAM for complex protocols, while LPC1111FHN33/102 provides 12 more GPIOs and 3 extra ADC channels in a smaller footprint - both retain identical power profiles and debug interface, making them drop-in replacements only in software-defined contexts where pin mapping and memory layout are reconfigured.

Availability

LPC1111FDH20/002 is available at Aetrix Electronics and suitable for lighting control, alarm systems, and eMetering requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for LPC1111FDH20/002 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 LPC1100L series - including LPC1111FDH20/002 - was designed for cost-sensitive, ultra-low-power embedded control in consumer and industrial equipment, emphasizing simplified toolchains and rapid time-to-market.

FAQ

What is the maximum operating frequency of the LPC1111FDH20/002?

The LPC1111FDH20/002 operates at a maximum CPU frequency of 50 MHz. This is achieved using the internal PLL driven by either the 12 MHz internal RC oscillator (trimmed to ±1 %) or an external crystal (1–25 MHz). The 50 MHz clock enables deterministic real-time response for UART, ADC sampling, and GPIO toggling in applications such as lighting dimming and alarm signaling - all while maintaining compatibility with the ARM Cortex-M0's low-power execution profile.

Does the LPC1111FDH20/002 support a second SPI interface?

No, the LPC1111FDH20/002 does not support a second SPI interface. Per the official datasheet block diagrams and ordering table, only one SPI (SPI0) is implemented in the TSSOP20 variants of the LPC1100L series. The second SPI (SPI1) is explicitly reserved for LQFP48 and HVQFN33 packages - a hardware limitation confirmed across all LPC1111FDH20/002 documentation. Designers requiring dual SPI must select an LQFP48 variant like LPC1113FBD48/302 or migrate to LPC1111FHN33/102.

What ADC channel count is supported on the LPC1111FDH20/002?

The LPC1111FDH20/002 supports 5 ADC input channels (AD0–AD4), consistent with its TSSOP20 pin count limitation. This is documented in Table 2 ("Ordering options") and Figure 1 block diagram annotations. Channels map to pins PIO0_11, PIO1_0, PIO1_1, PIO1_2, and PIO1_3 - all accessible within the 20-pin package. The 10-bit resolution enables accurate sensor reading for applications like ambient light sensing in lighting control or temperature monitoring in white goods UIs.

Is the windowed watchdog timer available on the LPC1111FDH20/002?

No, the windowed watchdog timer (WWDT) is not available on the LPC1111FDH20/002. This feature is exclusive to the LPC1100XL series, as stated in Section 2 ("Features and benefits") and Table 2. The LPC1111FDH20/002 belongs to the LPC1100L series and includes only the standard programmable watchdog timer (WDT). For applications requiring WWDT - such as safety-critical alarm systems - designers must select an XL-series part like LPC1111FHN33/103 or LPC1114FBD48/303.

What debug interface does the LPC1111FDH20/002 use?

The LPC1111FDH20/002 uses Serial Wire Debug (SWD) with two dedicated pins: SWCLK (PIO0_10) and SWDIO (PIO1_3). This 2-pin interface replaces JTAG for programming and real-time debugging, reducing PCB routing complexity and pin count. SWD is fully supported by LPCXpresso IDE, Keil MDK, and open-source tools like OpenOCD - enabling seamless firmware development and field updates without requiring additional debug headers or trace pins.