NXP Semiconductors OM40004UL

Overview

OM40004UL from NXP Semiconductors is a capacitive touch evaluation kit built around the LPC845 microcontroller, featuring integrated rotary wheel and slider (RWS) and 9-button matrix (BM) sensor boards, on-board CMSIS-DAP debug probe (LPC11U35), VCOM serial bridge, DAC-driven speaker output, and full support for MCUXpresso IDE, IAR EWARM, and Keil MDK toolchains.

For engineers reviewing the OM40004UL datasheet, OM40004UL pinout, OM40004UL application, or OM40004UL equivalent, this kit enables rapid prototyping of capacitive touch interfaces in consumer HMI, industrial control panels, and smart appliance UIs - with real-time tuning via FreeMASTER, power measurement capability, and flexible sensor board interconnectivity.

Technical Context

The OM40004UL comprises a Main Processor (MP) board hosting the LPC845 MCU and an LPC11U35-based CMSIS-DAP debug probe, enabling simultaneous target debugging and UART bridging over USB. Sensor signals are routed through a 2×13 header (P9) with dedicated CAPT_X/Y, ACMP_I5, and GPIO lines mapped to LPC845 pins including PIO0_0, PIO0_12, PIO0_15–PIO0_31, and PIO1_9.

Power delivery supports USB (J4), external 5V (P4), and isolated VDD measurement via P2 (2.43 Ω shunt) and P11 (ammeter insertion point). The board includes ISP (S3), Wake (S2), Reset (S1), and user LEDs (D1–D3), all directly connected to configurable LPC845 GPIOs with pull-up/pull-down and shared LPCXpresso expansion compatibility.

Key Specifications

Availability

OM40004UL is available at Aetrix Electronics and suitable for capacitive touch HMI development, embedded UI validation, and low-power sensor interface design requiring stable component supply and full toolchain integration.

Supply support for OM40004UL 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, IoT, and mobile applications.

The OM40004UL belongs to NXP's LPC800 evaluation platform family, designed specifically to accelerate development of capacitive touch human-machine interfaces using the LPC84x series' integrated analog front-end and low-power ARM Cortex-M0+ core.

FAQ

What is the OM40004UL used for?

The OM40004UL is a complete capacitive touch evaluation kit for the LPC845 microcontroller. It enables engineers to develop, test, and tune touch interfaces using its rotary wheel and slider (RWS) board, 9-button matrix (BM) board, on-board CMSIS-DAP debug probe, and FreeMASTER-compatible UART bridge. The OM40004UL supports rapid iteration of touch firmware in MCUXpresso IDE, IAR EWARM, and Keil MDK environments.

Does the OM40004UL include a debugger?

Yes, the OM40004UL integrates an LPC11U35-based CMSIS-DAP debug probe with SWD interface and virtual COM port (VCOM) functionality. This allows simultaneous debugging of the LPC845 target and serial communication with host tools like FreeMASTER. The probe supports drag-and-drop firmware updates via CRP_DISABLED mass storage mode when jumper P5 is installed during power-up.

Can the OM40004UL be used with third-party IDEs?

Yes, the OM40004UL is fully compatible with IAR EWARM (v8.12.2+) and Keil MDK after installing the LPC84x Device Pack (v1.5+). Its CMSIS-DAP probe is natively recognized by both IDEs as a standard debug interface. Sample projects for these toolchains are included in the official LPC84x Code Bundles downloadable from nxp.com.

How do I measure current consumption on the OM40004UL?

Current consumption of the LPC845 can be measured using header P11: remove resistor R53, then insert an ammeter between the P11 pins to complete the VDD path. Alternatively, voltage drop across the 2.43 Ω shunt resistor (measured at P2) yields current via Ohm's Law. Jumper P1 isolates LPC845 VDD from other board supplies for accurate readings.

Is the OM40004UL compatible with the LPCXpresso845MAX board?

Yes, the OM40004UL MP board is mechanically and functionally compatible with the LPCXpresso845MAX board for common features including pinout, debug interface, ISP/Wake/Reset buttons, and user LED connections. This enables seamless code porting and shared peripheral configuration between the two platforms during development.