NXP Semiconductors P89LPC901FN,129

Overview

P89LPC901FN,129 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 the same frequency. It integrates 1 kB byte-erasable Flash code memory, 128-byte RAM, two 16-bit timers, a 23-bit system/real-time clock, and a single analog comparator - all in an 8-pin DIP package. It targets low-cost embedded control applications such as appliance sub-systems and sensor interface modules requiring minimal external components.

For engineers reviewing the P89LPC901FN,129 datasheet, P89LPC901FN,129 pinout, P89LPC901FN,129 application, or P89LPC901FN,129 equivalent, this device offers verified support for internal RC oscillator operation (±1 % factory calibration), 2.4–3.6 V VDD supply with 5 V-tolerant I/O, programmable port configurations (quasi-bidirectional, open-drain, push-pull), and In-Application Programming (IAP-Lite) for non-volatile data storage.

Technical Context

The P89LPC901FN,129 executes instructions in two to four clocks, enabling 111–222 ns cycle times at 18 MHz - a direct architectural acceleration over legacy 80C51 cores. Its CPU clock source is configurable via Flash bits to select internal RC, watchdog oscillator, or external crystal/resonator (though XTAL1/XTAL2 pins are present, the P89LPC901 variant does not implement UART or dual comparators).

System-level integration includes a dedicated watchdog timer with independent on-chip oscillator and 8-step prescaler, brownout reset detection (configurable as interrupt or reset), and power-down mode with typical 1 µA current (comparators disabled). Port 0 supports keypad interrupt pattern matching, and Timer 0 can be configured as PWM output or port toggle on overflow.

Key Specifications

Pinout & Package

Package: Plastic dual in-line package; 8 leads (300 mil); SOT97-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P89LPC902FN,129 and P89LPC903FN,129, the P89LPC901FN,129 uniquely balances analog sensing (single comparator), timing precision (23-bit RTC + T0 PWM), and minimal external component count - making it optimal for cost-constrained, self-contained control subsystems without serial or dual-threshold requirements.

Availability

P89LPC901FN,129 is available at Aetrix Electronics and suitable for home appliance control, industrial sensor interface, consumer remote control, and smart lighting subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for P89LPC901FN,129 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 semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The P89LPC901FN,129 belongs to the LPC900 family of low-pin-count, high-integration 8-bit MCUs designed for cost-sensitive embedded control where minimal external components, low power, and rapid time-to-market are critical.

FAQ

What is the maximum operating frequency of the P89LPC901FN,129?

The P89LPC901FN,129 supports a maximum CPU clock frequency of 18 MHz. At this rate, its two-clock architecture achieves instruction cycle times of 111–222 ns for all instructions except multiply/divide. The internal RC oscillator is factory calibrated to ±1 % accuracy and supports frequencies from 20 kHz to 18 MHz, eliminating external crystal dependency in many applications.

Does the P89LPC901FN,129 support UART communication?

No, the P89LPC901FN,129 does not include UART hardware. UART functionality is exclusive to the P89LPC903 variant. The P89LPC901FN,129 provides two 16-bit timers, a 23-bit system timer, and a single analog comparator - but no TxD or RxD pins. For serial communication, external UART ICs or bit-banged software implementations are required.

Can the P89LPC901FN,129 operate without external passive components?

Yes - the P89LPC901FN,129 requires only VDD and VSS connections when using the internal RC oscillator and on-chip power-on reset. No external crystal, reset capacitor, or pull-up resistors are needed for basic operation. Its 5 V-tolerant I/O pins further reduce external protection circuitry, enabling true "two-wire" startup in space-constrained designs.

How is non-volatile data storage implemented on the P89LPC901FN,129?

The P89LPC901FN,129 uses its 1 kB Flash memory for non-volatile data storage via In-Application Programming (IAP-Lite). Individual bytes can be erased and rewritten without affecting adjacent locations, allowing firmware to allocate Flash sectors for configuration parameters, calibration values, or event logs - eliminating the need for external EEPROM in many applications.

What power-saving modes does the P89LPC901FN,129 support?

The P89LPC901FN,129 supports Idle mode and two distinct Power-down modes. In full Power-down mode with voltage comparators disabled, typical current consumption is 1 µA. Wake-up is triggered by external interrupt (e.g., keypad press) or RTC alarm. Brownout detection can be configured as an interrupt rather than reset, enabling graceful shutdown sequences before supply collapse.