NXP Semiconductors P89LPC9221FDH,518

Overview

P89LPC9221FDH,518 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 18 MHz. It integrates 8 kB Flash code memory, 256-byte RAM, dual 16-bit timers, real-time clock, two analog comparators, and I²C/UART peripherals. It targets low-power embedded control in industrial sensors and smart peripherals where compact size and high I/O drive capability are critical.

For engineers reviewing the P89LPC9221FDH,518 datasheet, P89LPC9221FDH,518 pinout, P89LPC9221FDH,518 application, or P89LPC9221FDH,518 equivalent, key selection considerations include its TSSOP20 package, 20 mA high-drive I/O capability on eight pins, factory-calibrated ±1% RC oscillator, 2.4–3.6 V operation with 5 V-tolerant I/O, and support for in-application Flash programming.

Technical Context

The P89LPC9221FDH,518 executes instructions in two to four CPU clocks-enabling 111 ns minimum instruction cycle time at 18 MHz-while integrating system-level functions including programmable port configurations (quasi-bidirectional, open-drain, push-pull), keypad interrupt pattern matching on Port 0, and independent watchdog oscillator (400 kHz). Its clock architecture supports four selectable sources: external crystal (20 kHz–18 MHz), internal RC (7.373 MHz ±1%), watchdog oscillator, or external clock input.

Peripheral integration includes an enhanced UART with fractional baud rate generator and break detection, 400 kHz I²C bus interface, real-time clock usable as system timer, and two analog comparators with selectable inputs and reference. Power management features include Idle mode, two Power-down modes (typical 1 µA total current with comparators disabled), and brownout reset configurable as interrupt.

Key Specifications

Pinout & Package

TSSOP20 plastic thin shrink small outline package (SOT360-1), 20 leads, body width 4.4 mm; requires only VDD and VSS for operation when internal reset and oscillator options are selected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P89LPC922FDH, the P89LPC9221FDH,518 adds high-drive I/O essential for direct actuation, while versus STC89C52RC it delivers integrated analog functions, 2.4–3.6 V operation, and factory-trimmed timing-reducing component count and design complexity in battery-powered or mixed-signal applications.

Availability

P89LPC9221FDH,518 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart keypad interfaces, LED lighting controllers, and legacy serial adapters requiring stable component supply and long-term lifecycle support.

Supply support for P89LPC9221FDH,518 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) designs high-integration, low-power microcontrollers for cost-sensitive embedded applications across industrial, consumer, and automotive markets.

The P89LPC92x family was engineered to replace discrete logic and multiple support ICs in space-constrained, low-cost systems-emphasizing on-chip peripherals, flexible clocking, and robust I/O to minimize external components.

FAQ

What is the maximum operating frequency of the P89LPC9221FDH,518?

The P89LPC9221FDH,518 supports a maximum CPU clock frequency of 18 MHz. This applies when using the high-speed oscillator option with an external crystal or resonator. At this frequency, the two-clock architecture achieves a minimum instruction cycle time of 111 ns, delivering six times the throughput of a standard 80C51 core running at the same clock rate. The P89LPC9221FDH,518 must have the reset input function enabled on P1.5 when operating above 12 MHz.

Does the P89LPC9221FDH,518 include an internal oscillator?

Yes, the P89LPC9221FDH,518 includes a factory-calibrated internal RC oscillator operating at 7.373 MHz ±1% at room temperature. It is fully tunable via the 6-bit TRIM register, allowing end-user adjustment for different frequencies or temperature compensation. This oscillator eliminates the need for external crystal components in cost- or space-constrained designs, and the P89LPC9221FDH,518 can operate with only VDD and VSS connections when internal reset and oscillator options are selected.

How many I/O pins on the P89LPC9221FDH,518 support 20 mA drive current?

Eight I/O pins on the P89LPC9221FDH,518 support 20 mA high-current source capability: P0.3 through P0.7, plus P1.4, P1.6, and P1.7. This feature enables direct driving of LEDs, small relays, or logic-level MOSFET gates without external buffer circuitry. The device specifies a total chip limit of 160 mA for simultaneous high-drive pin operation, ensuring safe thermal and electrical margins.

Can the P89LPC9221FDH,518 perform in-application programming of its Flash memory?

Yes, the P89LPC9221FDH,518 supports full in-application programming (IAP) of its 8 kB Flash memory. This allows firmware updates to be executed while the device remains operational-critical for remote or field-upgradable systems. Flash security bits prevent unauthorized reading of protected code, and erase granularity includes both 1 kB sectors and 64-byte pages, enabling efficient partial updates without full chip reprogramming.

What peripheral interfaces are integrated into the P89LPC9221FDH,518?

The P89LPC9221FDH,518 integrates an enhanced UART with fractional baud rate generator, break detection, and automatic address recognition; a 400 kHz I²C-bus interface with slave addressing and status registers; two 16-bit counter/timers configurable as PWM or toggle outputs; a real-time clock usable as a system timer; and two analog comparators with selectable inputs and reference. These peripherals eliminate the need for external interface ICs in typical embedded control applications.