NXP Semiconductors P89LPC9401FBD,551

Overview

P89LPC9401FBD,551 from NXP Semiconductors (formerly Philips) is an integrated 8-bit microcontroller with embedded 32-segment × 4-backplane LCD driver, combining a P89LPC931 MCU core and PCF8576D controller in a single 64-pin LQFP package. It delivers 8 kB byte-erasable flash, 256-byte RAM, dual analog comparators, two 16-bit timers, RTC capability, and I²C/SPI/UART interfaces - enabling compact, low-power LCD-based instrumentation such as digital multimeters and portable medical displays.

For engineers reviewing the P89LPC9401FBD,551 datasheet, P89LPC9401FBD,551 pinout, P89LPC9401FBD,551 application, or P89LPC9401FBD,551 equivalent, key selection criteria include its integrated LCD segment/backplane drive capability, 2.4–3.6 V operation with 5 V-tolerant I/O, on-chip RC oscillator tuning, and In-Application Programming (IAP) support for field firmware updates.

Technical Context

The P89LPC9401FBD,551 implements an accelerated two-clock 80C51 CPU core delivering 111–222 ns instruction cycle times at 18 MHz - six times faster than standard 80C51 at same frequency. Its clock system supports selectable sources: internal RC (7.373 MHz), watchdog oscillator, external crystal (20 kHz–18 MHz), or external clock input.

It integrates a dedicated I²C interface (SDA_LCD/SCL_LCD pins) to the on-die PCF8576D LCD controller, which provides 32 segment outputs (S0–S31), 4 backplane outputs (BP0–BP3), auto-increment display RAM, and programmable bias generation - eliminating need for external LCD driver ICs in space-constrained designs.

Key Specifications

Pinout & Package

64-pin LQFP package (SOT791-1), 14 × 14 × 1.4 mm body size, with 20–23 usable microcontroller I/O pins depending on oscillator/reset configuration.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller-with-LCD-driver applications.

Compared with PCF8576T/1 and P89LPC935FBD,552, the P89LPC9401FBD,551 uniquely combines MCU and LCD driver in one die - reducing BOM count, PCB area, and interconnect complexity for cost-sensitive, space-constrained LCD instrument designs.

Availability

P89LPC9401FBD,551 is available at Aetrix Electronics and suitable for digital multimeters, portable medical monitors, and industrial panel meters requiring stable component supply across extended product lifecycles.

Supply support for P89LPC9401FBD,551 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 (originally Philips Semiconductors) is a global leader in high-performance mixed-signal ICs for automotive, industrial, and consumer applications.

The P89LPC9401FBD,551 belongs to the LPC900 family - designed specifically for ultra-low-cost, low-power embedded systems with integrated LCD display capability and minimal external components.

FAQ

What is the maximum operating frequency of the P89LPC9401FBD,551?

The P89LPC9401FBD,551 supports a maximum CPU clock frequency of 18 MHz using external crystal or resonator. When using the internal RC oscillator, it operates at 7.373 MHz. The enhanced two-clock architecture ensures instruction execution at 111–222 ns per instruction - six times faster than standard 80C51 at same clock rate. This performance enables responsive UI updates and real-time sensor processing in the P89LPC9401FBD,551.

Does the P89LPC9401FBD,551 support In-System Programming (ISP)?

Yes, the P89LPC9401FBD,551 supports Serial Flash In-System Programming (ISP) via UART, allowing firmware programming while the device is soldered onto the target board. This eliminates need for socketed programming and enables field updates. ISP requires only VDD, GND, TXD, RXD, and RST connections - no external programmer hardware is needed beyond a standard UART interface. The P89LPC9401FBD,551 also supports In-Application Programming (IAP) for dynamic code modification during runtime.

How many LCD segments and backplanes does the P89LPC9401FBD,551 drive?

The P89LPC9401FBD,551 drives up to 32 segments and supports 1 to 4 backplanes via its integrated PCF8576D LCD controller. Segment outputs are S0–S31 (pins 31–62), and backplane outputs are BP0–BP3 (pins 27–30). The on-chip display RAM (40 × 4 bits) supports auto-increment addressing, minimizing CPU overhead during display refresh. This configuration enables common 32-segment alphanumeric displays used in multimeters and thermostats.

What are the power supply requirements for the P89LPC9401FBD,551?

The P89LPC9401FBD,551 requires a 2.4 V to 3.6 V VDD supply for the MCU core and peripherals, with VSS as ground reference. Its VLCD pin supplies the LCD panel and must be externally regulated - typically 2.5–5.5 V depending on LCD glass requirements. All I/O pins are 5 V tolerant (up to 5.5 V), allowing safe interfacing with 5 V logic without level shifters. The P89LPC9401FBD,551 achieves 9 µA typical power-down current when voltage comparators are disabled.

Can the P89LPC9401FBD,551 operate without external crystal components?

Yes, the P89LPC9401FBD,551 includes a high-accuracy internal RC oscillator (7.373 MHz) that can be fine-tuned via the TRIM register - enabling crystal-free operation. This eliminates external oscillator components, reduces BOM cost, and improves reliability in vibration-prone environments. The RC oscillator option is selected via flash configuration bits and supports full 2.4–3.6 V operation. For applications requiring tighter timing accuracy (e.g., UART communication), an external crystal remains optional.