NXP Semiconductors LPC1342FHN33,518

Overview

LPC1342FHN33 from NXP Semiconductors is a 32-bit ARM Cortex-M3 microcontroller in a 33-pin HVQFN package, operating at up to 72 MHz with 16 kB flash, 4 kB SRAM, USB Device controller (full-speed), one UART, one I²C-bus (Fast-mode Plus, 1 Mbit/s), four timers, and 10-bit ADC across 8 channels - deployed in lighting control and eMetering systems requiring compact, low-power embedded processing.

For engineers reviewing the LPC1342FHN33 datasheet, LPC1342FHN33 pinout, LPC1342FHN33 application, or LPC1342FHN33 equivalent, key selection criteria include USB Device support, HVQFN33 thermal performance, 33-pin GPIO count, Fast-mode Plus I²C compatibility, and boot options via UART or USB.

Technical Context

The LPC1342FHN33 implements an ARM Cortex-M3 core with Harvard architecture, 3-stage pipeline, and internal prefetch unit enabling speculative branching. It integrates a dedicated USB PLL for full-speed operation and uses a system PLL for CPU clock generation up to 72 MHz from either internal RC or external crystal sources.

Peripheral subsystems include an AHB-to-APB bridge, configurable IOCON block supporting pull-up/pull-down and hysteresis, and power management unit enabling Sleep, Deep-sleep, and Deep power-down modes - all coordinated via NVIC with 32 interrupt lines and programmable priority levels.

Key Specifications

Pinout & Package

HVQFN33 package: plastic thermal enhanced very thin quad flat package, no leads, 33 terminals, body size 7 × 7 × 0.85 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC1342FHN33, LPC1343FHN33 offers double flash/RAM for complex USB applications, while LPC11U37FHN33 trades Cortex-M3 performance for lower active power and higher memory - making LPC1342FHN33 optimal for balanced USB-enabled embedded control.

Availability

LPC1342FHN33 is available at Aetrix Electronics and suitable for lighting control, eMetering, and alarm systems requiring stable component supply, long-term industrial availability, and consistent HVQFN33 packaging across production batches.

Supply support for LPC1342FHN33 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 LPC1300 series was designed for cost-effective, low-power embedded applications requiring USB connectivity, analog sensing, and real-time control - targeting smart home, energy monitoring, and industrial HMI systems.

FAQ

What USB classes does the LPC1342FHN33 support natively?

The LPC1342FHN33 includes on-chip USB MSC and HID drivers in ROM, enabling immediate implementation of mass storage devices (e.g., firmware update drives) and human interface devices (e.g., keyboard/mouse emulation). No external USB stack licensing is required - the LPC1342FHN33 firmware can instantiate these classes using NXP's provided USB library without modifying core USB protocol logic.

Does the LPC1342FHN33 support in-application programming (IAP)?

Yes, the LPC1342FHN33 supports In-Application Programming via its on-chip bootloader. This allows firmware updates to be performed while the device is running - critical for remote field upgrades. The LPC1342FHN33 implements IAP through dedicated ROM API calls that safely reprogram flash sectors without disrupting active peripherals or interrupt handling.

What is the maximum ADC sampling rate achievable on the LPC1342FHN33?

The LPC1342FHN33 ADC supports up to 400 kS/s conversion rate under optimal conditions (single-channel, continuous mode, 10-bit resolution). This is achieved using the internal 12 MHz IRC oscillator as ADC clock source with minimal setup time - sufficient for real-time current/voltage monitoring in eMetering and motor control applications.

Can the LPC1342FHN33 operate from a 2.0 V supply?

Yes, the LPC1342FHN33 is fully specified to operate across 2.0 V to 3.6 V. At 2.0 V, CPU frequency is limited to 48 MHz (per datasheet Section 10.2), and USB functionality is disabled - but all other peripherals including ADC, timers, and I²C remain operational, enabling ultra-low-voltage battery-powered designs.

How many GPIO pins are available on the LPC1342FHN33 in HVQFN33 package?

The LPC1342FHN33 provides up to 30 GPIO pins in the HVQFN33 package. Pins reserved for RESET, USB_DM/DP, XTALIN/XTALOUT, VDD, and VSS reduce the total usable I/O count from 33 to 30 - all configurable with pull-up/pull-down, hysteresis, and open-drain mode via the IOCON block.