NXP Semiconductors P89LPC9151FDH,129

Overview

P89LPC9151FDH,129 from NXP Semiconductors is a low-cost 8-bit microcontroller based on an accelerated two-clock 80C51 core, executing instructions in 2–4 clocks at up to 18 MHz. It integrates 2 kB byte-erasable flash memory, 256-byte RAM, an 8-bit ADC with four analog inputs, dual comparators, and I²C communication. It targets compact embedded control applications such as sensor interface modules and keypad-based industrial controls.

For engineers reviewing the P89LPC9151FDH,129 datasheet, P89LPC9151FDH,129 pinout, P89LPC9151FDH,129 application, or P89LPC9151FDH,129 equivalent, key selection considerations include its 14-pin TSSOP package, 10–12 configurable I/O pins, 2.4–3.6 V operation with 5 V-tolerant I/O, integrated brownout detection, and support for in-application programming (IAP-Lite) of flash memory.

Technical Context

The P89LPC9151FDH,129 implements a high-performance 80C51 CPU architecture delivering six times the instruction throughput of standard 80C51 devices at the same clock frequency-e.g., 111–222 ns instruction cycles at 18 MHz. Its system-level integration includes a 23-bit real-time system timer (7-bit prescaler + 16-bit counter), enhanced UART with fractional baud rate generation, and 400 kHz I²C-bus interface.

It features programmable port output modes (quasi-bidirectional, open-drain, push-pull), Schmitt-trigger inputs on all I/O pins, and hardware-supported keypad interrupt detection across six Port 0 pins. The device supports dynamic clock switching among internal RC oscillator (tunable 20 kHz–18 MHz), watchdog oscillator (~400 kHz), and external clock input-enabling optimized power/performance trade-offs.

Key Specifications

Pinout & Package

Package: Plastic thin shrink small outline package; 14 leads; body width 4.4 mm (SOT402-1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with P89LPC9161FDH and P89LPC9171FDH, the P89LPC9151FDH provides the smallest footprint (14-pin TSSOP) and lowest component count for applications that do not require SPI or Timer 1-making it ideal for ultra-compact, cost-sensitive embedded control where I²C and single-timer operation suffice.

Availability

P89LPC9151FDH,129 is available at Aetrix Electronics and suitable for industrial sensor nodes, keypad-based HMIs, low-power metering modules, legacy 8051 upgrades, and compact embedded control systems requiring stable component supply and long-term manufacturability.

Supply support for P89LPC9151FDH,129 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 headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The P89LPC9151FDH,129 belongs to NXP's LPC900 family of enhanced 80C51 microcontrollers, designed specifically for cost-sensitive, space-constrained embedded systems requiring high integration, low power, and robust analog/mixed-signal capabilities.

FAQ

What is the maximum operating frequency of the P89LPC9151FDH,129?

The P89LPC9151FDH,129 supports a maximum operating frequency of 18 MHz. This applies whether using the internal RC oscillator (with optional clock doubler), external crystal, or external clock input. At 18 MHz, instruction cycle times range from 111 ns to 222 ns-six times faster than a standard 80C51 running at the same frequency. The P89LPC9151FDH,129 datasheet specifies this limit across the full −40 °C to +85 °C temperature range.

Does the P89LPC9151FDH,129 support in-system programming (ISP)?

Yes, the P89LPC9151FDH,129 supports In-System Programming (ISP) via its UART interface using standard commercial EPROM programmers. Flash memory can be programmed while the device is soldered onto the target board, enabling field firmware updates and simplified manufacturing. The P89LPC9151FDH,129 also supports In-Application Programming (IAP-Lite), allowing selected code memory sectors to be rewritten during runtime for data logging or parameter storage.

How many I/O pins does the P89LPC9151FDH,129 provide in its TSSOP14 package?

The P89LPC9151FDH,129 provides a minimum of 10 general-purpose I/O pins and up to 12 I/O pins when using on-chip oscillator and reset options. This includes six pins on Port 0 (P0.0–P0.5), five pins on Port 1 (P1.0–P1.4), and the RST pin (P1.5) configured as input-only. All I/O pins are 5 V tolerant (up to 5.5 V) and support multiple output configurations-quasi-bidirectional, open-drain, or push-pull-as defined in the P89LPC9151FDH,129 configuration registers.

What analog peripherals are integrated into the P89LPC9151FDH,129?

The P89LPC9151FDH,129 integrates a 4-channel 8-bit ADC (AD10–AD13), one DAC output (DAC1 on P0.4), and two analog comparators (CMP1 and CMP2) with selectable positive/negative inputs and shared reference (CMPREF). The ADC supports single-ended and differential modes; comparators feature hysteresis control and interrupt generation. These peripherals are fully accessible through dedicated SFRs and require no external components-enabling self-contained analog signal acquisition and conditioning in the P89LPC9151FDH,129.

Is the P89LPC9151FDH,129 pin-compatible with other members of the LPC91x family?

No, the P89LPC9151FDH,129 is not pin-compatible with P89LPC9161FDH or P89LPC9171FDH due to differing package sizes (14-pin TSSOP vs. 16-pin TSSOP) and distinct pin allocations. While all three share functional similarities-including flash size, ADC, DAC, and I²C-the P89LPC9151FDH,129 lacks SPI and Timer 1 pins present in the 16-pin variants. PCB layout must be redesigned to migrate between these variants; they are functionally related but not drop-in replacements.