NXP Semiconductors P89LPC907FD,112

Overview

P89LPC907FD,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, 128-byte RAM, dual 16-bit timers, a 23-bit system/real-time clock, analog comparator, and enhanced UART with transmit-only capability - all in an 8-pin SO-8 package for space-constrained embedded control applications.

For engineers reviewing the P89LPC907FD,112 datasheet, P89LPC907FD,112 pinout, P89LPC907FD,112 application, or P89LPC907FD,112 equivalent, this page delivers verified technical context, validated pin functions, confirmed feature-to-design-value mapping, and real-world application constraints - including its TxD-only UART, T0 PWM capability, and 5 V-tolerant I/O operation within 2.4–3.6 V VDD.

Technical Context

The P89LPC907FD,112 executes instructions in two to four clocks, enabling 111–222 ns cycle times at 18 MHz - a performance gain over legacy 80C51 without external acceleration. Its architecture embeds system-level functions including in-application programming (IAP-Lite), byte-erasable Flash for non-volatile data storage, and configurable port output modes (quasi-bidirectional, open-drain, push-pull).

It features an internal RC oscillator factory-calibrated to ±1 %, eliminating external crystal requirements; supports brownout detection with interrupt option; includes watchdog timer with eight prescaler options and separate on-chip oscillator; and provides keypad interrupt inputs (KBI4–KBI6) tied to Port 0 pins with pattern-match detection.

Key Specifications

Pinout & Package

Package: SO-8 (SOT96-1), plastic small outline, 8 leads, body width 7.5 mm. Supply pins (VDD, VSS) located centrally to improve decoupling and reduce EMI.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P89LPC906FD,112 and P89LPC908FD,112, the P89LPC907FD,112 uniquely balances transmit-only serial reporting, integrated PWM generation, and internal oscillator simplicity - making it optimal for cost-sensitive, space-constrained telemetry nodes where receive capability is unnecessary.

Availability

P89LPC907FD,112 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart metering modules, consumer remote controls, and embedded power supply monitors requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for P89LPC907FD,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 acquired Philips Semiconductors in 2006 and continues development of the LPC900 family as ultra-low-pin-count, high-integration 8-bit MCUs targeting cost-sensitive embedded control.

The P89LPC900 series was designed specifically for applications demanding minimal footprint, reduced external components, and robust operation in industrial and consumer environments - emphasizing integrated oscillators, programmable I/O, and power-efficient peripherals.

FAQ

Does P89LPC907FD,112 support full-duplex UART communication?

No. The P89LPC907FD,112 implements UART transmit-only (TxD) functionality. It lacks an RxD pin and associated receive circuitry, as confirmed by its pinout (P1.0/TxD only) and product comparison table. For bidirectional serial communication, P89LPC908FD,112 is the designated variant. The P89LPC907FD,112 UART is optimized for one-way telemetry, status reporting, or debug logging where host-side reception suffices.

Can P89LPC907FD,112 generate PWM signals?

Yes. Timer 0 on the P89LPC907FD,112 can be configured as a PWM output on pin P1.2/T0, as explicitly stated in Section 2.1 and Table 6 of the datasheet. This capability enables direct drive of LEDs, buzzers, or low-power actuators without external PWM generators. The P89LPC907FD,112's PWM function is distinct from P89LPC906FD,112 (no PWM) and P89LPC908FD,112 (no T0 PWM), making it the only variant in the family offering this feature.

What is the maximum operating frequency of P89LPC907FD,112?

The P89LPC907FD,112 supports a maximum CPU clock frequency of 18 MHz when using external crystal or resonator sources. With its internal RC oscillator, the maximum frequency is limited to the oscillator's calibrated range - up to 18 MHz per configuration bits, though typical operation is at lower frequencies (e.g., 7.37 MHz or 14.7 MHz) for stability and power optimization. Instruction cycle time ranges from 111 ns to 222 ns at 18 MHz.

Is P89LPC907FD,112 compatible with 5 V logic interfaces?

Yes. All I/O pins of the P89LPC907FD,112 are 5 V tolerant and may be pulled up to or driven to 5.5 V, as specified in Section 2.1. This allows direct connection to 5 V peripherals (e.g., sensors, displays, level translators) without external voltage-shifting circuitry - a key advantage in mixed-voltage systems. The core operates from 2.4–3.6 V VDD, maintaining low power while interfacing safely with legacy 5 V infrastructure.

How does the analog comparator on P89LPC907FD,112 function?

The P89LPC907FD,112 integrates a single analog comparator with positive input (CIN1A on P0.4), negative reference input (CMPREF on P0.5), and digital output (CMP1 on P0.6). It supports ratiometric comparisons using internal or external references and can trigger interrupts or be polled via SFR. Unlike higher-end variants, it lacks multiple comparator channels or programmable hysteresis - its design targets basic threshold detection in sensor monitoring or supply supervision tasks.