NXP LPC845M301JHI33: A Comprehensive Technical Overview of the Arm Cortex-M0+ Microcontroller

The NXP LPC845M301JHI33 is a powerful and flexible microcontroller unit (MCU) from NXP Semiconductors' LPC800 series, built around the highly efficient Arm Cortex-M0+ core. This MCU is engineered to deliver an optimal blend of performance, power efficiency, and integration, making it a compelling choice for a vast array of embedded applications, including consumer electronics, industrial control, and Internet of Things (IoT) sensor nodes.

At the heart of this device lies the Arm Cortex-M0+ processor, renowned for its exceptional energy efficiency and minimal silicon footprint. Operating at frequencies up to 30 MHz, this core provides ample processing power for complex control tasks while maintaining a low-power profile. The microcontroller is further enhanced by its single-cycle I/O access capability, which allows for rapid bit manipulation and significantly improves the performance of applications that require fast toggling of GPIO pins.

A standout feature of the LPC845 is its integrated programmable logic unit (PLU). This innovative block contains 5 lookup tables (LUTs) and 4 flip-flops, enabling designers to implement custom combinatorial and sequential logic directly on the microcontroller. This eliminates the need for an external CPLD or FPGA in many cases, reducing system cost, board space, and complexity for functions like glue logic, custom interfaces, or state machines.

Memory resources are robust for its class, featuring 64 KB of on-chip flash memory for code storage and 16 KB of SRAM for data. The flash memory supports in-application programming (IAP) and in-system programming (ISP), facilitating easy firmware updates in the field.

The peripheral set is extensive and designed for connectivity and control. Key communication interfaces include:

Up to 5 USARTs, one of which supports the Synchronous Serial Interface (SSP)

2 I2C-bus interfaces

1 SPI interface

A critical analog feature is the 16-channel, 10-bit ADC with support for two independent conversion sequences, allowing for sophisticated and flexible sampling of multiple analog inputs.

The LPC845 also incorporates a Multi-Rate Timer (MRT) for generating precisely timed interrupts and a Self-Wake-Up Timer (WKT) for exiting low-power modes. Its Power Quadrature Encoder Interface (QEI) is essential for precise motor control applications. The package is a 33-pin HVQFN, offering a compact form factor.

ICGOODFIND: The NXP LPC845M301JHI33 distinguishes itself in the crowded Cortex-M0+ market with its unique combination of core efficiency, a rich set of standard peripherals, and the game-changing inclusion of on-chip programmable logic (PLU). This feature, uncommon in microcontrollers of this category, provides unparalleled design flexibility, making it an exceptional value for cost-sensitive, space-constrained, and power-conscious embedded designs.

Keywords: Arm Cortex-M0+, Programmable Logic Unit (PLU), 10-bit ADC, In-System Programming (ISP), Low-Power.