NXP Semiconductors LPC2146FBD64,151

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 compact industrial control, protocol conversion, and voice recognition systems requiring integrated analog I/O and real-time USB connectivity.

For engineers reviewing the LPC2146FBD64 datasheet, LPC2146FBD64 pinout, LPC2146FBD64 application, or LPC2146FBD64 equivalent, key selection criteria include its dual-ADC capability (14-channel aggregate), USB DMA-accessible 8 kB RAM, 60 MHz CPU clock with PLL, 5 V-tolerant I/O, and support for ISP/IAP firmware updates without external programming hardware.

Technical Context

The LPC2146FBD64 implements the ARM7TDMI-S core with dual instruction sets (32-bit ARM and 16-bit Thumb), enabling high code density and real-time interrupt response. Its memory subsystem includes a 128-bit wide interface and accelerator architecture supporting full-speed 60 MHz execution in both modes.

It integrates two independent 10-bit ADCs (AD0 and AD1) with up to 14 total inputs and 2.44 µs per-channel conversion time, plus a dedicated 10-bit DAC (AOUT) on P0.25. The USB 2.0 Full-speed controller includes 2 kB endpoint RAM and an additional 8 kB of SRAM accessible via DMA - exclusively available in LPC2146/48 variants.

Key Specifications

Pinout & Package

Package: LQFP64 - plastic low profile quad flat package, 64 leads, body size 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 capability but with 256 kB flash - ideal for cost-optimized designs with moderate firmware size. Versus LPC2368FBD100, it trades Ethernet for USB 2.0 Full-speed and uses a smaller 64-pin footprint, favoring compact USB-peripheral applications.

Availability

LPC2146FBD64 is available at Aetrix Electronics and suitable for industrial control, USB peripheral development, and sensor gateway applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

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 I/O, USB connectivity, and real-time processing - targeting access control, point-of-sale, and protocol conversion markets.

FAQ

What is the maximum operating frequency of the LPC2146FBD64?

The LPC2146FBD64 achieves a maximum CPU clock frequency of 60 MHz using its on-chip PLL, which has a 100 µs settling time. This frequency is supported across the full industrial temperature range (−40 °C to +85 °C) and enables deterministic real-time execution for time-critical tasks such as ADC sampling control and USB packet handling. The 128-bit wide memory interface ensures no wait states at this speed.

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

Yes, the LPC2146FBD64 supports In-System Programming via its UART0 interface using the on-chip boot loader. It allows full-chip or sector-by-sector flash 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 suitable for remote maintenance and iterative development of products like USB peripherals and sensor nodes.

How many analog-to-digital converter (ADC) channels does the LPC2146FBD64 have?

The LPC2146FBD64 features two independent 10-bit ADCs: ADC0 with 8 channels and ADC1 with 7 channels, totaling 14 analog inputs. Conversion time is as low as 2.44 µs per channel. This dual-ADC architecture supports simultaneous sampling across multiple sensors - for example, reading temperature, humidity, and pressure concurrently in environmental monitoring systems using the LPC2146FBD64.

What is the purpose of the 8 kB RAM marked "shared with USB DMA" in the LPC2146FBD64?

The 8 kB RAM shared with USB DMA in the LPC2146FBD64 is physically separate from the main 32 kB SRAM and is directly accessible by the USB controller's DMA engine. While primarily used for USB endpoint buffering, it can also be accessed by the CPU as general-purpose RAM. This dual-access capability enables zero-copy USB data transfers - for instance, streaming ADC results directly to a host PC without CPU intervention - significantly reducing interrupt load and improving real-time throughput in the LPC2146FBD64.

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 pinouts, electrical characteristics, and peripheral mappings. Differences are limited to internal resources: flash (256 kB), RAM (32 kB + 8 kB USB-DMA), and peripheral enablement (dual ADC, DAC). This allows hardware reuse across firmware variants - for example, designing one PCB that supports LPC2146FBD64 or LPC2148FBD64 based on production requirements.