What this LPC84x MCU brings to a control board
The NXP LPC845M301JHI33Y is a 32-bit ARM Cortex-M0+ microcontroller from the LPC84x series, clocked at 30 MHz with 64 KB of Flash and 16 KB of RAM. It packs 29 general-purpose I/O, a 12-bit ADC with 12 channels, a single 10-bit DAC, and a capacitive-touch sense block — enough peripheral mix to handle a small HMI panel, a sensor hub, or a motor-control interface without an external ADC or touch controller. The 30 MHz Cortex-M0+ core is a single-cycle I/O and interrupt engine; for a control loop or a Modbus RTU poll cycle, that clock keeps the bus latency under a microsecond. The 64 KB Flash holds a moderate firmware image — a bootloader plus a few communication stacks — while the 16 KB RAM gives enough headroom for a couple of UART buffers and a small data table.
The LPC845M301JHI33Y comes in a 32-HVQFN (5x5 mm) with exposed pad.
Peripherals and connectivity — what is on the silicon
On the communication side, you get I²C, SPI, and UART/USART — enough for a Modbus RTU slave, an I²C temperature sensor, and an SPI Flash or display. The 12-channel 12-bit ADC covers analog inputs like a potentiometer, a current-sense resistor, or a thermistor; the single 10-bit DAC can output an analog setpoint or a simple waveform. Built-in brown-out detect, POR, and a watchdog timer mean the MCU can reset itself cleanly on a power glitch — no external supervisor needed for basic robustness. The capacitive-sense block handles touch buttons or a slider without a separate touch controller.
Lifecycle and sourcing — what the BOM line looks like
No end-of-life notice has been issued, so this part is a stable line item for production builds.