NXP Semiconductors P89LPC906FD,112

Overview

P89LPC906FD,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 at same frequency. It integrates 1 kB Flash code memory with byte-erase capability, 128-byte RAM, dual 16-bit timers, a 23-bit system/real-time clock, and a single analog comparator - all in an 8-pin SO-8 package for compact embedded control in low-cost consumer and industrial systems.

For engineers reviewing the P89LPC906FD,112 datasheet, P89LPC906FD,112 pinout, P89LPC906FD,112 application, or P89LPC906FD,112 equivalent, key selection considerations include its internal RC oscillator (±1 % factory calibrated), 2.4–3.6 V operation with 5 V-tolerant I/O, up to six configurable I/O pins, and absence of UART hardware - distinguishing it from P89LPC907FD and P89LPC908FD variants.

Technical Context

The P89LPC906FD,112 executes instructions in two to four clocks, enabling 111–222 ns cycle times at 18 MHz - a performance gain over legacy 80C51 cores. Its architecture includes dedicated peripherals: a real-time clock subsystem usable as a 23-bit timer, programmable port output modes (quasi-bidirectional, open-drain, push-pull), and keypad interrupt detection on Port 0 pins.

It features an on-chip power monitor with brownout detect and programmable reset behavior, independent watchdog timer with eight prescaler options, and In-Application Programming (IAP-Lite) support for using Flash as non-volatile data storage. The device operates without external oscillator components when using the internal RC option and requires only VDD and VSS connections under that configuration.

Key Specifications

Pinout & Package

Package: Plastic small outline package; 8 leads; body width 7.5 mm (SOT96-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with P89LPC906FD,112, the P89LPC907FD adds UART transmit capability but removes crystal oscillator support, while the P89LPC908FD provides full UART but omits both crystal pins and PWM - making P89LPC906FD,112 the optimal choice for crystal-reliant, comparator-based, or low-pin-count timing-critical control where serial is handled externally.

Availability

P89LPC906FD,112 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart appliance control, and energy-efficient metering requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature ranges.

Supply support for P89LPC906FD,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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' semiconductor division.

The P89LPC906FD,112 belongs to the LPC900 family of low-pin-count, low-power 8-bit microcontrollers designed specifically for cost-sensitive, space-constrained embedded control applications where integration, reliability, and ease of use outweigh raw processing power.

FAQ

Does P89LPC906FD,112 include a UART peripheral?

No, the P89LPC906FD,112 does not integrate a UART. Unlike the P89LPC907FD (TxD only) and P89LPC908FD (full UART), the P89LPC906FD,112 omits UART hardware entirely. Serial communication must be implemented in software using GPIO pins or handled externally. This omission enables its minimal 8-pin SO-8 footprint and reduces die area/cost for applications where serial is unnecessary.

What is the maximum operating frequency of P89LPC906FD,112?

The P89LPC906FD,112 supports a maximum operating frequency of 18 MHz. At this clock speed, instruction cycle times range from 111 ns to 222 ns (excluding multiply/divide), delivering six times the throughput of a standard 80C51 core running at the same frequency. The internal RC oscillator is factory-calibrated to ±1 % and supports frequencies from 20 kHz to 18 MHz.

Can P89LPC906FD,112 operate without external passive components?

Yes, the P89LPC906FD,112 can operate with only VDD and VSS connections when configured to use the internal RC oscillator and on-chip power-on reset. No external crystal, capacitors, or reset circuitry are required - significantly reducing bill-of-materials and PCB area. External components become necessary only if using XTAL1/XTAL2 or requiring enhanced timing accuracy beyond ±1 %.

How many I/O pins are available on P89LPC906FD,112?

The P89LPC906FD,112 provides up to six usable I/O pins: P0.4, P0.5, P0.6, P3.0, P3.1, and P1.5 (RST, configurable as input-only). All pins support Schmitt-trigger inputs and programmable output modes (quasi-bidirectional, open-drain, push-pull). Pin count is constrained by the 8-pin SO-8 package and functional allocation of RST and oscillator pins.

Is P89LPC906FD,112 compatible with In-System Programming (ISP)?

Yes, the P89LPC906FD,112 supports In-System Programming via its RST pin during power-up, enabling firmware updates without removing the device from the PCB. It uses Serial Flash In-Circuit Programming (ICP) compatible with commercial EPROM programmers. Flash security bits prevent unauthorized reading of protected application code, ensuring intellectual property protection during production and field deployment.