NXP Semiconductors P89LPC9321FA,529

Overview

P89LPC9321FA,529 from NXP Semiconductors is an 8-bit accelerated two-clock 80C51 microcontroller in PLCC28 package, featuring 8 kB byte-erasable flash, 512-byte on-chip data EEPROM, dual analog comparators with PGA, and 23-bit real-time system timer. It operates from 2.4 V to 3.6 V with 5 V-tolerant I/Os and supports In-System Programming (ISP) for field updates - deployed in industrial sensor nodes and low-power embedded control systems.

For engineers reviewing the P89LPC9321FA,529 datasheet, P89LPC9321FA,529 pinout, P89LPC9321FA,529 application, or P89LPC9321FA,529 equivalent, key selection criteria include its 23 I/O minimum count, 18 MHz max clock frequency, 4-level brownout detection, programmable port configurations (quasi-bidirectional/open-drain/push-pull), and integrated I²C/SPI/UART peripherals with fractional baud rate generation.

Technical Context

The P89LPC9321FA,529 implements a high-performance 80C51 core executing instructions in 2–4 clocks - delivering six times the throughput of standard 80C51 at identical clock frequencies. Its architecture integrates a Capture/Compare Unit (CCU) supporting PWM, input capture, and output compare functions across four channels (OCA–OCD, ICA–ICB), plus dual 16-bit timers configurable as PWM outputs or overflow toggles.

It features a programmable on-chip oscillator (20 kHz–18 MHz), selectable internal RC oscillator with clock doubler, and independent watchdog oscillator (400 kHz ±5%). Power management includes idle mode and two power-down modes with typical 1 μA total current (voltage comparators disabled), and wake-up via LOW interrupt input.

Key Specifications

Pinout & Package

Package: PLCC28 (plastic leaded chip carrier; 28 leads; SOT261-2). Pin count: 28, with 23–26 usable I/Os depending on oscillator/reset configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P89LPC9321FA,529, the P89LPC9351FA,529 trades comparator/PGA capability for integrated ADC and larger flash, while the P89LPC9251FA,529 reduces peripheral count and I/O count to lower BOM cost - making P89LPC9321FA,529 optimal for applications needing both analog comparison and flexible PWM timing in minimal footprint.

Availability

P89LPC9321FA,529 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter interfaces, and low-power HVAC controllers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature ranges (−40 °C to +85 °C).

Supply support for P89LPC9321FA,529 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in energy-efficient microcontrollers and mixed-signal integration.

The P89LPC9321FA,529 belongs to NXP's LPC900 family of enhanced 80C51 microcontrollers, designed specifically for cost-sensitive, low-power embedded control applications demanding high integration, robust analog peripherals, and field-programmable flash.

FAQ

What is the maximum operating frequency of the P89LPC9321FA,529?

The P89LPC9321FA,529 supports a maximum operating frequency of 18 MHz. This applies whether using an external crystal/resonator on XTAL1/XTAL2 or the internal RC oscillator with clock doubler enabled. At 18 MHz, instruction cycle times range from 111 ns to 222 ns - six times faster than a standard 80C51 at the same clock rate. The P89LPC9321FA,529 datasheet confirms this limit across all temperature and voltage conditions (−40 °C to +85 °C, 2.4 V–3.6 V).

Does the P89LPC9321FA,529 support In-System Programming (ISP)?

Yes, the P89LPC9321FA,529 fully supports In-System Programming via its UART interface, allowing firmware updates while the device is soldered into the target application. This capability requires no external programming hardware beyond a serial interface and is enabled by the on-chip bootloader. The P89LPC9321FA,529 also supports In-Circuit Programming (ICP) and In-Application Programming (IAP), enabling dynamic code modification during runtime without halting execution.

How many I/O pins does the P89LPC9321FA,529 provide in PLCC28 package?

The P89LPC9321FA,529 in PLCC28 package provides a minimum of 23 configurable I/O pins and up to 26 I/O pins, depending on whether on-chip oscillator and reset options are used. All 28 pins are assigned specific functions - including VDD, VSS, XTAL1/XTAL2, RST, and dedicated peripheral signals - with Port 0 (8 pins), Port 1 (8 pins), Port 2 (8 pins), and Port 3 (2 pins) forming the core I/O structure. Pin descriptions confirm 23–26 pins are usable as general-purpose I/Os.

What analog peripherals are integrated into the P89LPC9321FA,529?

The P89LPC9321FA,529 integrates two analog comparators (CMP1 and CMP2) with selectable inputs and reference source, plus a single Programmable Gain Amplifier (PGA) offering gains of 2×, 4×, 8×, or 16× that can be applied to comparator inputs. These peripherals enable precision threshold detection, window comparison, and signal conditioning without external op-amps. The P89LPC9321FA,529 datasheet explicitly lists these as principal features and details their register-level control in the CMP1/CMP2 SFRs.

Is the P89LPC9321FA,529 compatible with 5 V logic interfaces?

Yes, the P89LPC9321FA,529 features 5 V-tolerant I/O pins - meaning all port pins (except VDD and VSS) may be safely pulled up to or driven by 5.5 V logic signals while operating from a 2.4 V–3.6 V supply. This eliminates level-shifting circuitry when interfacing with legacy 5 V peripherals such as sensors, displays, or communication transceivers. The P89LPC9321FA,529 datasheet specifies this tolerance in the "Principal features" section and confirms it under DC characteristics.