NXP Semiconductors LPC1346FBD48,151

Overview

LPC1346FBD48,151 from NXP Semiconductors is a 32-bit ARM Cortex-M3 microcontroller designed for USB-enabled embedded control applications. It operates at up to 72 MHz, integrates 48 kB flash, 8 kB SRAM, 2 kB EEPROM, a full-speed USB 2.0 device controller with ROM-based driver library, and an 8-channel 12-bit ADC sampling at 500 kSamples/s. It targets industrial USB peripherals and medical devices requiring low-power operation across −40 °C to +85 °C.

For engineers reviewing the LPC1346FBD48,151 datasheet, LPC1346FBD48,151 pinout, LPC1346FBD48,151 application, or LPC1346FBD48,151 equivalent, key selection criteria include USB device controller support, 48-pin LQFP package compatibility, 48 kB flash/8 kB SRAM memory configuration, 12-bit ADC performance, and wake-up capability from Deep power-down mode via dedicated WAKEUP pin (PIO0_16).

Technical Context

The LPC1346FBD48,151 implements the ARM Cortex-M3 r2p1 core with Harvard architecture, 3-stage pipeline, and integrated NVIC for deterministic interrupt handling. Its clock system includes dual PLLs-one for CPU (up to 72 MHz) and a dedicated USB PLL-enabling independent, jitter-free timing for both core and USB functions.

Peripheral integration includes two SSP controllers with FIFO and multi-protocol support, a Fast-mode Plus I²C-bus interface (1 Mbit/s), one RS-485/EIA-485 USART with smart card (ISO 7816-3) and synchronous mode support, and four general-purpose timers (two 16-bit, two 32-bit) with configurable capture/match functionality.

Key Specifications

Pinout & Package

LQFP48 package: plastic low profile quad flat package, 48 leads, body 7 × 7 × 1.4 mm (SOT313-2). Pin 1 index corner marked; thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC1347FBD48 and LPC1343FBD48, the LPC1346FBD48,151 delivers optimal balance of USB integration, memory capacity, and power efficiency for cost-sensitive USB peripheral designs - avoiding over-specification while ensuring production-ready USB device functionality without external components.

Availability

LPC1346FBD48,151 is available at Aetrix Electronics and suitable for industrial control gateways, handheld medical sensors, and USB audio peripherals requiring stable component supply and long-term manufacturability.

Supply support for LPC1346FBD48,151 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 focused on secure connectivity solutions for automotive, industrial, and IoT markets, with deep expertise in ARM-based microcontrollers and mixed-signal integration.

The LPC1300 series was engineered specifically for USB-enabled embedded applications demanding low power, high integration, and robust real-time performance - targeting cost-sensitive industrial and consumer peripherals where USB device functionality is essential.

FAQ

What USB classes does the LPC1346FBD48,151 support natively?

The LPC1346FBD48,151 supports USB Communication Device Class (CDC), Human Interface Device (HID), and Mass Storage Class (MSC) via its on-chip ROM-based USB driver library. This eliminates the need for external USB stack licensing or porting effort. The LPC1346FBD48,151 does not support USB host or OTG functionality - it operates exclusively as a USB device. All class implementations are validated against USB-IF compliance requirements in the official NXP reference designs.

Does the LPC1346FBD48,151 require an external crystal for USB operation?

Yes, the LPC1346FBD48,151 requires a 12 MHz crystal connected to XTALIN/XTALOUT for accurate USB timing. While the internal 12 MHz IRC oscillator is trimmed to ±1 % accuracy, USB Full-Speed specification mandates ±0.25 % tolerance - achievable only with a crystal. The dedicated USB PLL locks to this crystal, ensuring compliant 48 MHz USB clock generation. The LPC1346FBD48,151 datasheet specifies 12 MHz ±100 ppm crystal as mandatory for USB-certified operation.

How many ADC channels are accessible in the LQFP48 package of the LPC1346FBD48,151?

The LPC1346FBD48,151 provides access to all eight ADC input channels (AD0–AD7) in the LQFP48 package. Pins AD0–AD4 are mapped to PIO0_11 through PIO0_15; AD5 and AD6 are on PIO0_16 and PIO0_22; AD7 is on PIO0_23. No ADC channel is omitted in this package variant - full 8-channel capability is retained, enabling simultaneous multi-sensor acquisition in space-constrained designs using the LPC1346FBD48,151.

Can the LPC1346FBD48,151 enter Deep power-down mode and wake up via USB activity?

No, the LPC1346FBD48,151 cannot wake from Deep power-down mode via USB activity. Wake-up from Deep power-down is supported only via the dedicated WAKEUP pin (PIO0_16) or a reset event. USB-related wake-up (e.g., VBUS detect or USB_CONNECT) is available only from Sleep and Deep-sleep modes. This limitation is explicitly documented in Section 7.5.4 of the LPC1315_16_17_45_46_47 datasheet - confirming that USB wake-up is disabled in Deep power-down to maintain minimum current draw (<1 µA).

Is the LPC1346FBD48,151 pin-compatible with other members of the LPC13xx family in LQFP48?

Yes, the LPC1346FBD48,151 is pin-compatible with LPC1345FBD48 and LPC1347FBD48 in the LQFP48 package - sharing identical pin assignments, power domains, and peripheral mappings. However, it is not compatible with LPC131x variants (e.g., LPC1316FBD48) because those lack USB signals (USB_DP/DM, USB_VBUS, USB_CONNECT) on pins 46–48. Firmware must be verified for flash size and USB feature dependencies before substitution, but PCB layout remains unchanged among LPC134x LQFP48 variants.