NXP Semiconductors LPC2146FBD64,557

Overview

LPC2146FBD64 from NXP Semiconductors is a 32-bit ARM7TDMI-S microcontroller in LQFP64 package, featuring 256 kB on-chip flash, 32 kB + 8 kB USB-shared SRAM, dual 10-bit ADCs (14 channels total), single 10-bit DAC, USB 2.0 Full-speed device controller with 2 kB endpoint RAM, and 45 fast 5 V-tolerant GPIO pins. It targets industrial control, medical systems, and communication gateways requiring compact size, low power, and mixed-signal processing.

For engineers reviewing the LPC2146FBD64 datasheet, LPC2146FBD64 pinout, LPC2146FBD64 application, or LPC2146FBD64 equivalent, key selection criteria include USB DMA-accessible RAM allocation, dual-ADC channel count, DAC availability, 60 MHz CPU clock capability, and 5 V-tolerant I/O compatibility with legacy peripherals.

Technical Context

The LPC2146FBD64 implements an ARM7TDMI-S core with Thumb/ARM dual instruction set support, enabling code density reduction (>30 %) without significant performance penalty. Its 128-bit wide memory interface and accelerator architecture sustain full 60 MHz operation from internal PLL with 100 µs settling time.

It integrates dual 10-bit ADCs (AD0 and AD1) delivering up to 14 analog inputs with 2.44 µs per-channel conversion, plus a single 10-bit DAC (AOUT) for analog output generation. USB 2.0 Full-speed functionality includes dedicated 2 kB endpoint RAM and an additional 8 kB SRAM accessible via DMA - exclusive to LPC2146/48 variants.

Key Specifications

Pinout & Package

Package: LQFP64 (plastic low profile quad flat package; 64 leads; body 10 × 10 × 1.4 mm, SOT314-2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC2148FBD64, the LPC2146FBD64 offers identical peripherals and USB-DMA RAM but 256 kB less flash - suitable for cost-sensitive deployments where firmware fits within 256 kB. Versus LPC2368FBD100, it trades Ethernet for USB 2.0 Full-speed and uses a smaller 64-pin package, reducing board area and BOM cost in USB-centric edge nodes.

Availability

LPC2146FBD64 is available at Aetrix Electronics and suitable for industrial control systems, medical sensor hubs, and point-of-sale terminals requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for LPC2146FBD64 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The LPC214x family was designed for cost-sensitive, space-constrained embedded systems requiring integrated analog peripherals, USB device capability, and real-time responsiveness - targeting access control, POS, and industrial gateway markets.

FAQ

What is the maximum operating frequency of the LPC2146FBD64?

The LPC2146FBD64 achieves a maximum CPU clock frequency of 60 MHz using its programmable on-chip PLL with 100 µs settling time. This frequency is sustained across the full −40 °C to +85 °C industrial temperature range and enables deterministic execution of real-time control tasks and USB packet handling without throttling. The 128-bit memory interface ensures zero-wait-state operation at this speed.

Does the LPC2146FBD64 support in-system programming (ISP)?

Yes, the LPC2146FBD64 supports In-System Programming (ISP) via its on-chip boot loader software using UART0. It allows full chip or sector erase in 400 ms and 256-byte programming in 1 ms. This capability enables field firmware updates without removing the device from the PCB, making it ideal for deployed medical or industrial equipment requiring post-deployment security patches or feature enhancements.

How is the 8 kB USB-DMA SRAM allocated and accessed in the LPC2146FBD64?

In the LPC2146FBD64, the 8 kB SRAM is physically shared between the CPU and USB DMA controller. It is mapped into the ARM7 local bus address space and can be used simultaneously for general-purpose data/code storage by the CPU and as a high-speed buffer for USB endpoint transfers. Access arbitration is handled internally; no external logic is required. This dual-use design eliminates need for external FIFOs in USB device implementations.

What analog capabilities does the LPC2146FBD64 provide?

The LPC2146FBD64 integrates two independent 10-bit ADCs (AD0 and AD1) supporting up to 14 total analog inputs with conversion times as low as 2.44 µs per channel. It also includes one 10-bit DAC (AOUT) on P0.25 for generating analog output waveforms or reference voltages. Both ADCs and DAC share the same VREF and VDDA supply domains, ensuring consistent scaling and accuracy across acquisition and generation functions.

Is the LPC2146FBD64 pin-compatible with other members of the LPC214x family?

Yes, the LPC2146FBD64 is fully pin-compatible with LPC2141FBD64, LPC2142FBD64, LPC2144FBD64, and LPC2148FBD64 in the LQFP64 package. All share identical pinout, electrical characteristics, and peripheral mapping. Differences are limited to flash/RAM sizes and enabled peripherals (e.g., DAC and second ADC are present in LPC2146FBD64 but absent in LPC2141FBD64), allowing hardware reuse across firmware variants.