NXP Semiconductors P89LPC920FN,112

Overview

P89LPC920FN,112 from NXP Semiconductors (formerly Philips) is an 8-bit microcontroller based on a two-clock 80C51 core, delivering six times the instruction throughput of standard 80C51 devices at 18 MHz. It integrates 2 kB Flash code memory, 256-byte RAM, two 16-bit timers, real-time clock, dual analog comparators, and enhanced UART with fractional baud rate generation - enabling compact, low-power embedded control in space-constrained industrial and consumer systems.

For engineers reviewing the P89LPC920FN,112 datasheet, P89LPC920FN,112 pinout, P89LPC920FN,112 application, or P89LPC920FN,112 equivalent, key selection criteria include its 2.4–3.6 V operation with 5 V-tolerant I/Os, on-chip RC oscillator calibrated to ±1 %, programmable port configurations (quasi-bidirectional/open-drain/push-pull), and support for In-Application Programming (IAP) of Flash memory.

Technical Context

The P89LPC920FN,112 executes instructions in two to four CPU clock cycles via its accelerated two-clock architecture, achieving 111–222 ns instruction cycle times at 18 MHz. Its clock system supports four selectable sources: internal RC oscillator (7.373 MHz, factory-trimmed), watchdog oscillator (400 kHz), external crystal (20 kHz–18 MHz), or external clock input - all configurable via Flash configuration bits.

Peripheral integration includes a 400 kHz I²C-bus interface, UART with break detection and automatic address recognition, two analog comparators with selectable inputs and reference, and keypad interrupt capability across Port 0 pins. Power management features include Idle mode, two Power-down modes (typical 1 µA total current with comparators disabled), and brownout reset with optional interrupt.

Key Specifications

Pinout & Package

Package: DIP20 (plastic dual in-line package, 20 leads, 300 mil width, SOT146-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with P89LPC920FN,112, P89LPC922FN offers immediate Flash capacity headroom while maintaining identical hardware integration, whereas NXP LPC932 provides modern development infrastructure at the cost of minor firmware toolchain adaptation.

Availability

P89LPC920FN,112 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart appliance control, energy meter interface modules, and POS terminal peripheral controllers requiring stable component supply and long-lifecycle support.

Supply support for P89LPC920FN,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, formerly Philips Semiconductors, is a global leader in high-performance mixed-signal ICs for automotive, industrial, and consumer applications.

The P89LPC920FN,112 belongs to the LPC900 family of 8-bit microcontrollers designed specifically for cost-sensitive, space-constrained embedded control applications demanding high integration, low power, and robust analog/digital peripheral sets.

FAQ

What is the maximum operating frequency of the P89LPC920FN,112?

The P89LPC920FN,112 supports a maximum operating frequency of 18 MHz. This applies when using the high-speed crystal oscillator option (4–18 MHz range) or external clock input. At 18 MHz, the two-clock architecture delivers instruction cycle times of 111–222 ns, enabling six times the throughput of a standard 80C51 running at the same clock frequency. The P89LPC920FN,112 must have the reset function enabled on P1.5 when operating above 12 MHz.

Does the P89LPC920FN,112 support in-circuit programming?

Yes, the P89LPC920FN,112 supports both Serial Flash Programming for in-circuit production coding and In-Application Programming (IAP) of its 2 kB Flash memory. IAP allows firmware updates while the device is running, enabling field upgrades without removing the P89LPC920FN,112 from the target system. Flash security bits prevent unauthorized reading of protected application code.

What are the I/O voltage tolerance specifications for the P89LPC920FN,112?

The P89LPC920FN,112 features 5 V-tolerant I/O pins, meaning all port pins may be safely pulled up to or driven by signals up to 5.5 V, even when operating from a 2.4–3.6 V VDD supply. This eliminates the need for external level-shifting circuitry when interfacing with legacy 5 V peripherals such as displays, sensors, or logic families - a key advantage in mixed-voltage system designs.

How does the on-chip RC oscillator in the P89LPC920FN,112 achieve accuracy?

The P89LPC920FN,112's on-chip RC oscillator is factory-calibrated to ±1 % at room temperature (25 °C) and operates at 7.373 MHz. Its frequency can be fine-tuned using the 6-bit TRIM register, allowing end users to adjust for temperature drift or board-level variations. This calibration and trim capability enables reliable operation without external crystal components, reducing cost and board space in cost-sensitive applications.

Can the P89LPC920FN,112 generate PWM signals?

Yes, the P89LPC920FN,112 can generate PWM signals using either Timer 0 or Timer 1. Each 16-bit timer may be configured to toggle a port output upon overflow, producing a square-wave PWM output. The duty cycle is controlled by loading the timer registers with appropriate initial values, and the frequency is determined by the selected clock source and timer reload value - enabling basic motor control or LED dimming without external hardware.