NXP Semiconductors P89LPC9381FDH,512

Overview

P89LPC9381FDH,512 from NXP Semiconductors (formerly Philips) is an 8-bit accelerated 2-clock 80C51 microcontroller in a 28-pin TSSOP package, delivering six times the instruction throughput of standard 80C51 cores at up to 18 MHz. It integrates 4 kB byte-erasable flash, 256 B RAM, an 8-channel 10-bit ADC, dual 16-bit timers, and on-chip oscillators - enabling compact, low-cost embedded control in sensor interfaces and industrial I/O modules.

For engineers reviewing the P89LPC9381FDH,512 datasheet, P89LPC9381FDH,512 pinout, P89LPC9381FDH,512 application, or P89LPC9381FDH,512 equivalent, key selection criteria include its 2.4–3.6 V operation with 5 V-tolerant I/Os, in-application programming capability, RTC-enabled 23-bit system timer, and support for UART/I²C/SPI/Keypad interrupt peripherals without external timing components.

Technical Context

The P89LPC9381FDH,512 executes instructions in two to four clock cycles using an accelerated 2-clock 80C51 core, achieving 111–222 ns instruction cycle times at 18 MHz. Its clock architecture supports four selectable sources - crystal/resonator, internal RC oscillator (7.373 MHz), watchdog oscillator, or external clock - with programmable division via DIVM register and fail-detect capability.

It implements a unified peripheral memory map with bit-addressable SFRs including AD0CON (ADC control), I2CON (I²C control), SPCTL (SPI control), and RTCCON (RTC control), enabling direct register-level configuration of analog, communication, and timing functions without external glue logic.

Key Specifications

Pinout & Package

Package: 28-pin TSSOP (SOT361-1), 4.4 mm body width, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with the P89LPC9381FDH,512, the LPC935FDH trades flash size and RTC capability for lower unit cost, while the PIC16F18857-I/SP offers greater analog precision and code space at the expense of increased external component count and absence of hardware RTC integration.

Availability

P89LPC9381FDH,512 is available at Aetrix Electronics and suitable for industrial sensor interfaces, smart metering front-ends, keypad-controlled HMIs, and low-power remote I/O modules requiring stable component supply and long-term manufacturability.

Supply support for P89LPC9381FDH,512 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 focused on secure connectivity solutions for automotive, industrial, and IoT applications.

The P89LPC9381FDH,512 belongs to NXP's legacy LPC900 family of enhanced 80C51 microcontrollers, designed specifically for cost-sensitive, space-constrained embedded control applications requiring integrated analog peripherals and low-power operation.

FAQ

What is the maximum operating frequency of the P89LPC9381FDH,512?

The P89LPC9381FDH,512 supports a maximum operating frequency of 18 MHz when using an external crystal or resonator. Its internal RC oscillator operates at 7.373 MHz and is fine-tunable via the TRIM register. At 18 MHz, the accelerated 2-clock core achieves instruction cycle times of 111–222 ns - six times faster than a standard 80C51 running at the same clock rate. The P89LPC9381FDH,512 datasheet confirms this limit applies across the full −40 °C to +85 °C industrial temperature range.

Does the P89LPC9381FDH,512 support in-system programming (ISP)?

Yes, the P89LPC9381FDH,512 supports serial flash ISP, allowing firmware updates while the device is mounted in the end application. This is enabled via the UART interface using the on-chip bootloader, requiring only VDD, GND, TXD, and RXD connections. The P89LPC9381FDH,512 also supports In-Application Programming (IAP), permitting code modification during normal execution - critical for field-upgradable firmware and dynamic parameter storage without halting operation.

How many analog input channels does the ADC in the P89LPC9381FDH,512 support?

The P89LPC9381FDH,512 features an 8-input multiplexed 10-bit ADC (ADC0), supporting analog inputs on P2[0] (AD07), P2[1] (AD06), P0[0] (AD05), P1[7] (AD04), P0[1] (AD00), P0[2] (AD01), P0[3] (AD02), and P0[4] (AD03). Channel selection is controlled via the AD0INS register, and conversion results are stored in eight dedicated 10-bit data registers (AD0DAT0L/R through AD0DAT7L/R). This matches the specification in the official P89LPC9381FDH,512 datasheet Section 6.2 and Table 3.

What are the power supply requirements for the P89LPC9381FDH,512?

The P89LPC9381FDH,512 operates from a single 2.4 V to 3.6 V VDD supply, with VSS as the 0 V reference. All I/O pins are 5 V tolerant (rated to 5.5 V), enabling safe interfacing with 5 V logic without external level shifters. The device includes on-chip power-on reset and low-voltage reset (brownout detect) circuitry, eliminating the need for external reset ICs. Typical power-down current is 1 µA when voltage comparators are disabled - a value explicitly specified for the P89LPC9381FDH,512 in its datasheet Section 2.2.

Can the P89LPC9381FDH,512 generate PWM signals?

Yes, the P89LPC9381FDH,512 can generate PWM signals using either Timer 0 or Timer 1. Each 16-bit timer may be configured to toggle a port output upon overflow, producing symmetrical or asymmetrical PWM waveforms. The duty cycle is controlled by loading the THx/TLx registers, and the frequency is determined by the timer reload value and CPU clock source. This capability is documented in the P89LPC9381FDH,512 datasheet Section 2.1 under "Two 16-bit counter/timers" and verified in the functional diagram (Figure 2) showing T0/T1 routed to port pins.