NXP Semiconductors LPC2105FBD48/01,15

Overview

LPC2105FBD48/01 from NXP Semiconductors is a 32-bit ARM7TDMI-S microcontroller in LQFP48 package, featuring 128 kB flash, 32 kB SRAM, dual UARTs with fractional baud rate generators, two 32-bit timers (7 capture/compare channels), six PWM outputs, and 32 GPIO pins with 5 V tolerance. It operates at up to 60 MHz via on-chip PLL and targets compact, low-power embedded systems such as access control and protocol converters.

For engineers reviewing the LPC2105FBD48/01 datasheet, LPC2105FBD48/01 pinout, LPC2105FBD48/01 application, or LPC2105FBD48/01 equivalent, key selection criteria include its −40 °C to +85 °C industrial temperature range, dual power supply (1.8 V core / 3.3 V I/O), embedded trace macrocell for real-time instruction tracing, and Fast GPIO enabling 3.5× faster pin toggling than baseline variants.

Technical Context

The LPC2105FBD48/01 implements the ARM7TDMI-S RISC core with Thumb instruction set support, enabling 32-bit execution at 60 MHz via a 128-bit wide memory interface and accelerator architecture. Its Vectored Interrupt Controller supports configurable priorities across 16 vectored IRQ slots and FIQ/IRQ/non-vectored classification.

On-chip peripherals include two UARTs with hardware handshake flow control, Fast I²C-bus (400 kbit/s), SPI/SSP controller supporting SPI/SSI/Microwire, two 32-bit general-purpose timers with capture/compare capability, and a dedicated PWM unit with six outputs - all accessible through a unified AHB/APB bus architecture.

Key Specifications

Pinout & Package

Package: LQFP48 (7 mm × 7 mm × 1.4 mm, SOT313-2), 48-pin plastic low-profile quad flat package with exposed pad not specified; pin configuration identical across all LQFP48 variants including LPC2105FBD48/01.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit ARM microcontroller applications.

Compared with LPC2106FBD48/01, the LPC2105FBD48/01 reduces SRAM by 32 kB while retaining identical peripheral set and industrial temperature grade - making it ideal for cost-sensitive, memory-optimized designs. Versus LPC2138FBD64, it trades USB and higher flash for smaller footprint and lower BOM cost, targeting non-USB embedded control.

Availability

LPC2105FBD48/01 is available at Aetrix Electronics and suitable for access control terminals, industrial protocol gateways, and point-of-sale peripherals requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LPC2105FBD48/01 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, with leadership in ARM-based microcontrollers and RF technologies.

The LPC2100 series was designed specifically for compact, low-power 32-bit embedded control - emphasizing small footprint (LQFP48), dual power domains, and rich serial peripheral integration for protocol-rich edge devices.

FAQ

What is the maximum operating frequency of the LPC2105FBD48/01?

The LPC2105FBD48/01 achieves a maximum CPU clock frequency of 60 MHz using its on-chip Phase-Locked Loop (PLL). This speed is enabled by a 128-bit wide memory interface and accelerator architecture that sustains full 32-bit instruction execution without wait states. The PLL has a 100 µs settling time, ensuring rapid clock domain stabilization after power-up or frequency changes - a critical parameter for deterministic real-time control in the LPC2105FBD48/01.

Does the LPC2105FBD48/01 support in-system programming (ISP)?

Yes, the LPC2105FBD48/01 supports In-System Programming (ISP) via its UART0 interface using the on-chip bootloader. Flash programming occurs at 1 ms per 512-byte line, with single-sector or full-chip erase taking 400 ms. This capability allows field firmware updates without removing the LPC2105FBD48/01 from the target board, and is fully compatible with standard RS-232 level shifters or TTL UART adapters.

What is the difference between LPC2105FBD48/00 and LPC2105FBD48/01?

Both LPC2105FBD48/00 and LPC2105FBD48/01 share identical electrical specifications, pinout, and functionality. The /01 suffix denotes a later revision with enhanced ESD robustness and updated wafer fabrication process - confirmed in NXP's official errata and product change notices. No schematic or layout modifications are required when migrating from /00 to /01; the LPC2105FBD48/01 is a drop-in replacement with improved manufacturing consistency.

Can the LPC2105FBD48/01 operate with a 1 MHz crystal?

Yes, the LPC2105FBD48/01's on-chip crystal oscillator supports an input frequency range of 1 MHz to 25 MHz, as specified in the official NXP datasheet. When using a 1 MHz crystal, the PLL can multiply this reference to achieve the full 60 MHz CPU clock - though loop filter component values must be selected per NXP AN10408 guidelines to ensure stable lock under low-frequency input conditions for the LPC2105FBD48/01.

How many UARTs does the LPC2105FBD48/01 include, and what advanced features do they offer?

The LPC2105FBD48/01 integrates two UARTs (UART0 and UART1), both compliant with the 16C550 specification. Key advanced features include hardware-implemented handshake flow control (RTS/CTS/DSR/DTR), fractional baud rate generators for precise timing across diverse system clocks, and autobauding capability to automatically detect incoming baud rates - all implemented entirely in hardware without CPU intervention, preserving processing bandwidth for the LPC2105FBD48/01's primary application tasks.