NXP Semiconductors P89LPC9401FBD,557

Overview

P89LPC9401FBD,557 from NXP Semiconductors (formerly Philips) is an 8-bit two-clock 80C51 microcontroller integrated with a PCF8576D LCD driver in a single 64-pin LQFP package. It delivers 8 kB byte-erasable flash, 256-byte RAM, 32-segment × 4-backplane LCD control, dual analog comparators, and three timers-including a 23-bit system timer usable as RTC-targeting embedded instrumentation with integrated display.

For engineers reviewing the P89LPC9401FBD,557 datasheet, P89LPC9401FBD,557 pinout, P89LPC9401FBD,557 application, or P89LPC9401FBD,557 equivalent, key selection criteria include its on-chip LCD driver interface (SCL_LCD/SDA_LCD), 5 V-tolerant I/O pins, internal RC oscillator fine-tuning capability, and support for In-Application Programming (IAP) of flash memory.

Technical Context

The P89LPC9401FBD,557 implements an accelerated two-cycle 80C51 core delivering 111–222 ns instruction cycle times at 18 MHz-six times faster than standard 80C51 at same frequency. Its clock system supports four selectable sources: internal RC (7.373 MHz, trimmable), watchdog oscillator, external crystal (20 kHz–18 MHz), or external clock input.

It integrates two independent communication subsystems: one I²C-bus port (400 kHz) for MCU peripherals and a dedicated I²C interface (SCL_LCD/SDA_LCD) exclusively for the embedded PCF8576D LCD controller. The LCD subsystem provides 32 segment outputs (S0–S31), 4 backplane outputs (BP0–BP3), auto-increment display RAM, and programmable bias generation.

Key Specifications

Pinout & Package

Package: 64-pin LQFP (14 × 14 × 1.4 mm, SOT791-1), RoHS-compliant, with 20–23 configurable 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-integrated-LCD-driver applications.

Compared with PCF8576T/1/1,118 and P89LPC935FBD,557, the P89LPC9401FBD,557 uniquely combines display driving, real-time clock, and programmable I/O in one die-reducing component count and interconnect complexity for cost-sensitive, space-constrained LCD-based controls.

Availability

P89LPC9401FBD,557 is available at Aetrix Electronics and suitable for industrial panel meters, portable medical devices, smart energy meters, and home appliance control panels requiring stable component supply across extended product lifecycles.

Supply support for P89LPC9401FBD,557 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 series for cost-sensitive, low-power embedded control.

The P89LPC9401FBD,557 belongs to the LPC900 microcontroller family designed specifically for integration of display, sensing, and control in compact instrumentation-emphasizing reduced external components, low active/idle power, and robust in-system programmability.

FAQ

What is the maximum operating frequency of the P89LPC9401FBD,557?

The P89LPC9401FBD,557 supports a maximum CPU clock frequency of 18 MHz, achievable using the high-speed external crystal oscillator option. At this frequency, its accelerated two-clock 80C51 core delivers instruction cycle times of 111–222 ns-six times faster than a standard 80C51 running at the same clock rate. The internal RC oscillator operates at 7.373 MHz and is fine-tunable via the TRIM register.

Does the P89LPC9401FBD,557 support In-System Programming (ISP)?

Yes, the P89LPC9401FBD,557 supports In-System Programming (ISP) via its UART interface, allowing firmware updates while the device remains soldered in the end application. This capability is enabled through the bootloader residing in ROM and requires only the RST and TXD/RXD pins. ISP eliminates the need for socketed programming and enables field upgrades of display logic or calibration data without hardware intervention.

How many I/O pins are available on the P89LPC9401FBD,557, and what are their voltage tolerances?

The P89LPC9401FBD,557 provides up to 23 microcontroller I/O pins in its 64-pin LQFP package when using on-chip oscillator and reset options. All I/O pins are 5 V tolerant-capable of being pulled up to or driven by 5.5 V logic-while operating from a 2.4–3.6 V VDD supply. This allows seamless interfacing with legacy 5 V peripherals without level-shifting circuitry.

Can the P89LPC9401FBD,557 drive a 4-backplane LCD display?

Yes, the P89LPC9401FBD,557 integrates a PCF8576D LCD controller capable of driving displays with 1 to 4 backplanes and up to 32 segments. Its dedicated BP0–BP3 outputs and S0–S31 segment drivers support static, 1/2, 1/3, or 1/4 multiplex configurations. The on-chip display RAM (40×4 bits) with auto-increment addressing minimizes CPU overhead during display refresh.

What power-saving features does the P89LPC9401FBD,557 offer?

The P89LPC9401FBD,557 offers Idle mode and two Power-down modes. In full Power-down with voltage comparators disabled, typical current consumption is 9 µA. Wake-up is supported via LOW interrupt inputs, external interrupts (INT0/INT1), keypad pattern match, or RTC alarm. Brownout detection enables graceful shutdown during voltage drop, and the watchdog timer uses a separate on-chip oscillator to remain functional during low-power states.