NXP Semiconductors LPC1124JBD48/303QL

Overview

LPC1124JBD48/303QL from NXP Semiconductors is a 32-bit ARM Cortex-M0 microcontroller in LQFP48 package, delivering up to 50 MHz CPU operation with 32 kB flash, 8 kB SRAM, 12-bit ADC (2 Msamples/s, 8 channels), three RS-485 UARTs, two SSP interfaces, one Fast-mode Plus I²C bus, and up to 38 GPIO pins - deployed in smart metering, lighting control, and alarm systems.

For engineers reviewing the LPC1124JBD48/303QL datasheet, LPC1124JBD48/303QL pinout, LPC1124JBD48/303QL application, or LPC1124JBD48/303QL equivalent, key selection considerations include its 32 kB flash size (vs. 64 kB in LPC1125), 50 MHz max clock, LQFP48 footprint, Deep-sleep wake-up via PIO1_4, and Fast-mode Plus I²C support at 1 Mbit/s.

Technical Context

The LPC1124JBD48/303QL implements an ARM Cortex-M0 core with integrated NVIC supporting 32 vectored interrupts and four priority levels, enabling deterministic real-time response in resource-constrained embedded systems. Its peripheral set includes dual 32-bit and dual 16-bit timers with capture/match functionality, fractional baud rate UARTs for RS-485 interoperability, and a hardware-accelerated GPIO subsystem accessible via AHB for low-latency I/O.

Power management is handled by an on-chip PMU supporting Sleep, Deep-sleep, and Deep power-down modes - with wake-up capability from up to 13 GPIO pins including dedicated PIO1_4 with 20 ns glitch filter. Clock generation combines a 12 MHz ±1 % internal RC oscillator, external crystal support (1–25 MHz), and a programmable PLL enabling full-speed CPU operation without high-frequency crystals.

Key Specifications

Pinout & Package

LQFP48 package: plastic low-profile quad flat package, 48 leads, body size 7 × 7 × 1.4 mm (SOT313-2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC1125JBD48/303, the LPC1124JBD48/303QL offers identical performance and peripherals at lower flash capacity - ideal for cost-optimized metering or lighting products. Against LPC1114FHN33/102, it delivers superior industrial connectivity (three RS-485 UARTs, two SSPs) and larger SRAM, making it better suited for complex sensor fusion or multi-protocol gateways.

Availability

LPC1124JBD48/303QL is available at Aetrix Electronics and suitable for eMetering, lighting control, and alarm systems requiring stable component supply across long-life industrial programs.

Supply support for LPC1124JBD48/303QL 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, and IoT markets.

The LPC112x product line was designed specifically for cost-sensitive, low-power 32-bit embedded applications - bridging the gap between legacy 8/16-bit MCUs and higher-end Cortex-M3/M4 devices in metering, home automation, and industrial control.

FAQ

What is the maximum operating frequency of the LPC1124JBD48/303QL?

The LPC1124JBD48/303QL operates at a maximum CPU frequency of 50 MHz. This speed is achievable using either the internal 12 MHz RC oscillator with PLL multiplication or an external crystal up to 25 MHz. The PLL allows full-speed operation without requiring high-frequency crystals, simplifying board design and reducing BOM cost while maintaining real-time responsiveness in applications like lighting control and alarm systems.

Does the LPC1124JBD48/303QL support RS-485 communication?

Yes, the LPC1124JBD48/303QL supports RS-485 communication through all three of its UART peripherals. Each UART includes hardware 9-bit addressing and automatic address detection, enabling robust multi-drop bus implementations. This capability is essential for industrial metering and building automation systems where multiple nodes share a single twisted-pair bus - and is confirmed in the official NXP LPC112x datasheet Rev. 1 (2015), Section 7.8.

How much flash memory does the LPC1124JBD48/303QL have, and how does it differ from the LPC1125?

The LPC1124JBD48/303QL contains 32 kB of on-chip flash memory, whereas the LPC1125JBD48/303 variant has 64 kB. Both share identical peripherals, clocking, power management, and LQFP48 pinout. The reduced flash size in the LPC1124JBD48/303QL targets cost-optimized applications where firmware fits within 32 kB - such as basic smart metering firmware or lighting control stacks without OTA update capability.

What is the ADC specification of the LPC1124JBD48/303QL?

The LPC1124JBD48/303QL integrates a 12-bit successive approximation ADC with a maximum sampling rate of 2 Msamples/s and eight input channels. It supports configurable conversion sequences, hardware threshold comparison, zero-crossing detection, and burst mode operation. The ADC uses dedicated VREFP/VREFN pins and operates over the full VDDA range (1.8–3.6 V), making it suitable for precision analog sensing in white goods motor control and eMetering current measurement.

Can the LPC1124JBD48/303QL enter low-power modes, and how is wake-up managed?

Yes, the LPC1124JBD48/303QL supports Sleep, Deep-sleep, and Deep power-down modes via its integrated Power Management Unit (PMU). Wake-up from Deep power-down is enabled via the dedicated PIO1_4 pin, which features a 20 ns glitch filter and requires external pull-HIGH before entry. Up to 13 GPIO pins can serve as wake-up sources in Deep-sleep mode. These capabilities are documented in Section 7.6 of the NXP LPC112x datasheet and enable µA-range operation in battery-backed alarm panels.