NXP Semiconductors P89LPC915FN,112

Overview

P89LPC915FN,112 from NXP Semiconductors is a low-pin-count 8-bit microcontroller based on an accelerated two-clock 80C51 core, executing instructions in 2–4 clocks at up to 18 MHz (111–222 ns cycle time). It integrates 2 kB flash code memory with byte-erasable sectors, 256-byte RAM, dual 16-bit timers, 4-channel 8-bit ADC, dual analog comparators, and enhanced UART - all in a 14-pin DIP package for compact embedded control applications including keypad-based industrial interfaces and sensor signal conditioning.

For engineers reviewing the P89LPC915FN,112 datasheet, P89LPC915FN,112 pinout, P89LPC915FN,112 application, or P89LPC915FN,112 equivalent, this page delivers verified technical context, validated pin functions, real-world use cases, and confirmed alternative options - all grounded in NXP's official Rev. 05 product data sheet dated 15 December 2009.

Technical Context

The P89LPC915FN,112 implements a high-performance 80C51 CPU architecture delivering six times the instruction throughput of standard 80C51 devices at identical clock frequencies. Its internal RC oscillator is factory-calibrated to ±1% and supports operation without external crystals, while the 23-bit system timer doubles as a real-time clock.

It features six keypad interrupt inputs (KBI0–KBI5), programmable port configurations (quasi-bidirectional, open-drain, push-pull), and Schmitt-triggered inputs across all I/O pins. The device supports In-Application Programming (IAP-Lite) and includes a watchdog timer with eight selectable prescaler values and brownout detection configurable as interrupt or reset.

Key Specifications

Pinout & Package

Package: Plastic dual in-line package; 14 leads (300 mil); SOT27-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P89LPC915FDH, the P89LPC915FN,112 offers identical functionality in a through-hole DIP package for manual assembly and socket-based testing, while P89LPC916FDH trades comparator 2 for SPI - making it incompatible for analog threshold applications but suitable for serial peripheral expansion.

Availability

P89LPC915FN,112 is available at Aetrix Electronics and suitable for industrial keypad interfaces, sensor signal conditioning, low-power remote monitoring, and legacy serial device replacement requiring stable component supply and long-term production continuity.

Supply support for P89LPC915FN,112 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 P89LPC915FN,112 belongs to NXP's LPC900 family of low-pin-count 8-bit MCUs designed for cost-sensitive, space-constrained embedded control tasks where integration, power efficiency, and ease of programming are prioritized over raw performance.

FAQ

What is the maximum operating frequency of the P89LPC915FN,112?

The P89LPC915FN,112 operates at up to 18 MHz using either an external crystal or its internal RC oscillator. At this frequency, instruction cycle times range from 111 ns to 222 ns for all instructions except multiply and divide - delivering six times the throughput of a standard 80C51 running at the same clock speed. The internal RC oscillator is factory-calibrated to ±1%, enabling reliable operation without external timing components.

Does the P89LPC915FN,112 support in-system programming?

Yes, the P89LPC915FN,112 supports Serial Flash In-Circuit Programming (ICP) using commercial EPROM programmers, allowing simple production coding. It also implements In-Application Programming (IAP-Lite), enabling firmware updates or non-volatile data writes during runtime without requiring a full chip erase - a key feature for field-upgradable embedded systems using the P89LPC915FN,112.

How many analog inputs does the P89LPC915FN,112 have, and what is their resolution?

The P89LPC915FN,112 includes a 4-input multiplexed 8-bit analog-to-digital converter (ADC), providing four dedicated analog input channels (AD10–AD13) mapped to P0.1, P0.2, P0.3, and P0.4. Each conversion yields an 8-bit result, supporting applications such as sensor voltage monitoring and threshold-based control where moderate resolution suffices - consistent with the integrated design goals of the P89LPC915FN,112.

Can the P89LPC915FN,112 generate PWM signals?

No, the P89LPC915FN,112 does not support hardware PWM generation. While Timer 0 can be configured to toggle a port output on overflow, the datasheet explicitly states that PWM output capability is available only on the P89LPC917 variant (via Timer 1). The P89LPC915FN,112 lacks this feature - a documented distinction confirmed in Table 1 of the NXP product data sheet for P89LPC915/916/917.

What is the purpose of the CMP2 pin on the P89LPC915FN,112?

On the P89LPC915FN,112, the CMP2 function is assigned to P0.0 and serves as the output of Comparator 2. This comparator accepts inputs CIN2A and CIN2B (on P0.2 and P0.1 respectively) and compares them against the reference voltage applied to CMPREF (P0.5). The resulting logic-level output on P0.0 enables zero-crossing detection, window-comparison, or simple analog threshold triggering - a core capability distinguishing the P89LPC915FN,112 from the P89LPC916 variant.