NXP Semiconductors LPC1225FBD64/321,1

Overview

LPC1225FBD64/321 from NXP Semiconductors is a 32-bit ARM Cortex-M0 microcontroller targeting industrial automation, eMetering, and lighting control. It operates at up to 45 MHz, integrates 80 kB flash and 8 kB SRAM, features an 8-channel 10-bit ADC, two analog comparators with programmable output feedback, and supports I²C Fast-mode Plus (1 Mbit/s), dual UARTs (one with RS-485), and SSP/SPI.

For engineers reviewing the LPC1225FBD64/321 datasheet, LPC1225FBD64/321 pinout, LPC1225FBD64/321 application, or LPC1225FBD64/321 equivalent, this page delivers verified technical context, package-specific pin mapping, deterministic timing performance (CoreMark 1.51/MHz), low-power Deep-sleep/Deep power-down modes, and real-world application guidance for factory automation and white goods design.

Technical Context

The LPC1225FBD64/321 implements the ARM Cortex-M0 core with Nested Vectored Interrupt Controller (NVIC) and Serial Wire Debug (SWD), achieving 45+ CoreMark score at 45 MHz. Its ROM-based integer division library delivers several times higher arithmetic throughput than software-only implementations while reducing flash footprint.

It integrates a clock generation unit with 1–25 MHz crystal oscillator support, 12 MHz ±1 % internal RC oscillator, and PLL for full-speed CPU operation. Peripheral subsystems include a 21-channel Micro DMA controller, CRC engine, Windowed Watchdog Timer (IEC-60335 Class B certified), and four general-purpose timers (two 32-bit, two 16-bit) with capture/match capability.

Key Specifications

Pinout & Package

LQFP64 package (SOT314-2), 10 mm × 10 mm body, 1.4 mm height, 64 leads. Pin functions are configurable via IOCON registers; default reset states and alternate functions are documented per pin in Table 3 of the datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC1226FBD64/301, the LPC1225FBD64/321 trades 16 kB flash for identical low-power features and analog capabilities; versus LPC1115JBD48/301, it adds comparator-based signal conditioning and faster I²C - making it optimal for metering and alarm systems requiring precision analog interaction and industrial bus compliance.

Availability

LPC1225FBD64/321 is available at Aetrix Electronics and suitable for eMetering, lighting control, and industrial networking applications requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for LPC1225FBD64/321 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, with deep expertise in ARM-based microcontrollers and mixed-signal integration.

The LPC122x product line was designed specifically for cost-sensitive, low-power industrial applications such as factory automation, home energy management, and appliance control - emphasizing robust analog interfaces, certified safety peripherals, and field-programmable flexibility.

FAQ

What is the maximum operating frequency of the LPC1225FBD64/321?

The LPC1225FBD64/321 operates at a maximum CPU frequency of 45 MHz when executing from flash memory with one wait state. This frequency is supported by its ARM Cortex-M0 core and integrated PLL, enabling deterministic real-time performance in industrial control tasks while maintaining low power consumption.

Does the LPC1225FBD64/321 support in-system programming (ISP)?

Yes, the LPC1225FBD64/321 supports In-System Programming (ISP) via its on-chip bootloader, allowing firmware updates through UART0 without requiring external programming hardware. This capability is enabled by the ROM-based ISP handler and is fully compatible with standard serial interfaces used in field maintenance.

How many analog comparator inputs does the LPC1225FBD64/321 have?

The LPC1225FBD64/321 includes two analog comparators (ACMP0 and ACMP1), each with four dedicated input pins - totaling eight analog comparator inputs (ACMP0_I0–I3 and ACMP1_I0–I3). These inputs are mapped to GPIO pins PIO0_19–PIO0_22 and PIO0_23–PIO0_24 respectively.

Is the LPC1225FBD64/321 pin-compatible with other LPC122x variants in LQFP64?

Yes, the LPC1225FBD64/321 shares identical pinout and package (LQFP64, SOT314-2) with all other LPC122x devices in the 64-pin variant, including LPC1224, LPC1226, and LPC1227. Peripheral register mapping and GPIO functionality are consistent across the family, enabling hardware reuse across firmware variants.

What is the purpose of the ROSC pin on the LPC1225FBD64/321?

The ROSC pin (PIO0_29) on the LPC1225FBD64/321 provides a relaxation oscillator output used to emulate 555 timer behavior in comparator-based circuits. It enables self-timed oscillation without external components - useful for generating clock signals or timing intervals in metering and alarm applications.