NXP Semiconductors P89LPC922FDH,512

Overview

P89LPC922FDH,512 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 8 kB Flash code memory, 256-byte RAM, dual 16-bit timers, real-time clock, two analog comparators, and I²C/UART peripherals. It targets low-power embedded control in industrial sensors and smart peripherals.

For engineers reviewing the P89LPC922FDH,512 datasheet, P89LPC922FDH,512 pinout, P89LPC922FDH,512 application, or P89LPC922FDH,512 equivalent, key selection criteria include its 8 kB Flash capacity, TSSOP20 package with 15+ configurable I/O pins, 2.4–3.6 V operation with 5 V-tolerant I/O, and factory-calibrated ±1 % RC oscillator eliminating external crystals.

Technical Context

The P89LPC922FDH,512 executes instructions in two to four CPU clocks-enabling 111 ns minimum instruction cycle time at 18 MHz-while supporting multiple clock sources: internal 7.373 MHz RC oscillator (trimmable via 6-bit TRIM register), watchdog oscillator (400 kHz), or external crystal/resonator (20 kHz–18 MHz). Its CPU clock (CCLK) drives all peripherals at CCLK/2 (PCLK).

It implements a programmable port architecture with independent configuration per pin (quasi-bidirectional, open-drain, push-pull, input-only), Schmitt-trigger inputs, and port pattern-match interrupt on Port 0. The enhanced UART includes fractional baud rate generation, break detection, and automatic address recognition-critical for robust serial communication in noisy environments.

Key Specifications

Pinout & Package

TSSOP20 package (SOT360-1), 20-pin plastic thin shrink small outline, 4.4 mm body width; requires only VDD and VSS for basic operation when internal reset and oscillator options are enabled.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P89LPC922FDH,512, the P89LPC921FDH provides identical functionality at reduced Flash capacity-ideal for cost-optimized derivatives-while the STM8L052C6T6 offers modern ARM architecture and greater memory but demands full software rework and PCB redesign.

Availability

P89LPC922FDH,512 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart power outlets, embedded keypad terminals, and low-power remote transmitters requiring stable component supply across long production lifecycles.

Supply support for P89LPC922FDH,512 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 IoT applications, with deep expertise in low-power microcontrollers and secure connectivity.

The P89LPC92x family was designed for cost-sensitive, space-constrained embedded control applications demanding high integration, low voltage operation, and robust peripheral sets-including analog comparators, RTC, and I²C-without external timing components.

FAQ

What is the maximum operating frequency of the P89LPC922FDH,512?

The P89LPC922FDH,512 supports a maximum system clock frequency of 18 MHz. At this speed, its two-clock 80C51 core achieves instruction cycle times as low as 111 ns for most operations-six times faster than a standard 80C51 running at the same frequency. This enables precise timing for PWM, UART baud rates, and real-time event handling in the P89LPC922FDH,512.

Does the P89LPC922FDH,512 require an external crystal to operate?

No, the P89LPC922FDH,512 does not require an external crystal. It includes a factory-calibrated 7.373 MHz ±1 % on-chip RC oscillator that can be selected via Flash configuration bits. This allows full operation with only VDD and VSS connections-reducing BOM count and board area. The P89LPC922FDH,512 also supports external crystals (20 kHz–18 MHz) or clock inputs when higher precision is needed.

How much Flash memory does the P89LPC922FDH,512 have, and what erase granularity does it support?

The P89LPC922FDH,512 integrates 8 kB of on-chip Flash code memory. It supports sector erase (1 kB blocks) and page erase (64-byte pages), enabling flexible firmware updates and In-Application Programming (IAP). Single-byte erase is not supported; however, the fine-grained 64-byte page erase allows efficient patching and bootloader operation without disturbing adjacent code in the P89LPC922FDH,512.

What are the I/O voltage tolerance specifications for the P89LPC922FDH,512?

The P89LPC922FDH,512 operates from 2.4 V to 3.6 V on VDD, but all I/O pins are rated for 5.5 V tolerance. This means they may be safely pulled up to or driven by 5 V logic signals without damage or level-shifting circuitry. This 5 V tolerance simplifies interfacing with legacy 5 V peripherals, displays, and sensors-making the P89LPC922FDH,512 especially valuable in mixed-voltage industrial systems.

Can the P89LPC922FDH,512 generate PWM signals, and how is this implemented?

Yes, the P89LPC922FDH,512 can generate PWM signals using either Timer 0 or Timer 1. Each 16-bit counter/timer can be configured to toggle a port output on overflow, producing symmetrical PWM waveforms. The duty cycle is controlled by loading the timer's initial value (THx/TLx registers), and frequency is set by the timer reload value and system clock. This hardware PWM capability is fully integrated and requires no CPU intervention once configured in the P89LPC922FDH,512.