NXP Semiconductors LPC1756FBD80K

Overview

LPC1756FBD80K from NXP Semiconductors is a 32-bit ARM Cortex-M3 microcontroller designed for industrial embedded control, featuring 256 kB flash, 32 kB AHB SRAM, 16 kB APB SRAM, dual CAN 2.0B interfaces, USB 2.0 Host/Device/OTG with on-chip PHY, and 52 GPIO pins in an 80-pin LQFP package. It operates at up to 100 MHz and supports motor control PWM, 12-bit ADC, and I²S audio interface.

For engineers reviewing the LPC1756FBD80K datasheet, LPC1756FBD80K pinout, LPC1756FBD80K application, or LPC1756FBD80K equivalent, key selection considerations include its dual-CAN capability, USB OTG support with dedicated DMA, 100 MHz real-time performance, and compatibility with industrial networking, eMetering, and motor control systems requiring deterministic interrupt latency and peripheral co-processing.

Technical Context

The LPC1756FBD80K implements the ARM Cortex-M3 core with a 3-stage pipeline, Harvard architecture, and integrated MPU supporting eight memory regions. Its multilayer AHB matrix enables concurrent access by CPU, GPDMA, USB, and peripherals without arbitration delay.

Peripheral integration includes a 8-channel GPDMA controller servicing UARTs, SSP, I²S, ADC, DAC, timers, and memory-to-memory transfers; dual CAN controllers with full CAN 2.0B compliance; and a 12-bit ADC with six input channels and 200 kHz sampling rate - all accessible via AHB/APB bridges with configurable clock dividers for power optimization.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (12 mm × 12 mm × 1.4 mm, SOT315-1). Pin functions are multiplexed across Port 0–2 and Port 4, with dedicated JTAG/SWD debug, USB D+/D−, CAN1/CAN2, UART, SSP, I²C, I²S, ADC, DAC, PWM, and trace signals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC1756FBD80K, LPC1758FBD80 adds Ethernet at identical pinout and voltage specs, while LPC1768FBD100 expands I/O count and memory but requires PCB redesign - making LPC1756FBD80K optimal for cost-sensitive, CAN/USB-centric industrial controllers with fixed 80-pin layout constraints.

Availability

LPC1756FBD80K is available at Aetrix Electronics and suitable for eMetering, industrial networking, and motor control applications requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability validation.

Supply support for LPC1756FBD80K 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 leader specializing in secure connectivity solutions for automotive, industrial, and IoT markets, with deep expertise in ARM-based microcontrollers and edge processing.

The LPC175x series targets resource-constrained industrial applications demanding real-time determinism, mixed-signal integration, and robust fieldbus support - specifically optimized for metering, PLCs, and motor drives operating from 2.4 V to 3.6 V.

FAQ

What is the maximum operating frequency of the LPC1756FBD80K?

The LPC1756FBD80K operates at a maximum CPU frequency of 100 MHz, enabled by its ARM Cortex-M3 core and enhanced flash accelerator that delivers zero wait-state execution. This frequency is confirmed in Table 2 of the official NXP datasheet Rev. 8.7 and applies specifically to the LPC1756FBD80K variant - distinct from the 120 MHz LPC1759. The PLL supports clock generation from internal RC, crystal, or RTC sources.

Does the LPC1756FBD80K include an integrated DAC?

Yes, the LPC1756FBD80K includes a 10-bit Digital-to-Analog Converter (DAC) with dedicated conversion timer and DMA support, as explicitly listed in Table 2 under "DAC" column for LPC1756FBD80 and confirmed in Section 2 feature list ("On the LPC1759/58/56/54 only, 10-bit DAC"). Pin P0[26] serves as the AOUT output terminal.

How many CAN interfaces does the LPC1756FBD80K support?

The LPC1756FBD80K supports two CAN 2.0B controllers, as stated in Section 2 ("CAN 2.0B controller with two (LPC1759/58/56) or one (LPC1754/52/51) channels") and verified in Table 2 where "CAN" value is "2" for LPC1756FBD80. Pins P0[0]/RD1/TXD3/SDA1 and P2[7]/RD2 plus P2[8]/TD2 provide physical layer connections for CAN1 and CAN2 respectively.

Is the LPC1756FBD80K pin-compatible with other LPC175x variants?

Yes, the LPC1756FBD80K shares the same 80-pin LQFP package (SOT315-1) and pinout with LPC1759FBD80, LPC1758FBD80, LPC1754FBD80, LPC1752FBD80, and LPC1751FBD80 per Table 1. However, peripheral enablement differs - e.g., Ethernet is absent in LPC1756FBD80K, and DAC/I²S are present but not in lower variants - requiring firmware and schematic validation for substitution.

What debug interfaces are supported by the LPC1756FBD80K?

The LPC1756FBD80K supports standard JTAG, Serial Wire Debug (SWD), and Serial Wire Trace (SWO) interfaces. Pins TDI, TDO, TMS, TCK, and TRST implement JTAG; TMS/SWDIO and TCK/SWDCLK serve dual-role for SWD; and TDO/SWO provides trace output. Boundary Scan Description Language (BSDL) is not available, per Section 2 feature list.